Work in progress. We haven't benchmarked most of these providers yet, so most plans have no Overall score.

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Cached email verification API pricing: plans compared

Cached email verification APIs side by side: the fields each returns and what 1,000 emails cost.

Best cached email verification API in 2026
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APIScorePriceNot foundAddresses judgedTime per addressThe validation callAggregatorsChargesOverageCatch-allBounceIn their wordsDataPlanRate limitSpeedThe callAbout the planSources
API planOverall scorePrice scoreData scoreCost to get started scoreBundle scorePerformance score$ per 1,000Billing$ a month$ per 1,000CalledReal, said validBounced, said invalidWrongUnsureMedian10th percentile90th percentileFastestSlowestBaselineCallCharged per addressAggregatorsRepeat freePerAlso pays for$ per 1,000Add-ons$ per 1,000Bounce refundTheir pitchFreshnessKeep dataUse dataPayYou getEnough forExpiresPer dayPer secondConcurrentBatchAnswerMedianYou sendMethodPathPlanWho can get itRead from
MailValid, $79 monthly, MailValid Plus 50,000 credits, POST /api/v1/verify/single57.46152755054$1.58monthly$79$0.0019 of 197 of 133 of 60 of 199 of 190.91 s0.73 s2.54 s0.57 s5.39 s0.29 sPOST mailvalid.io/api/v1/verify/single$0.004, nothing when unknownnonenevercallfrom the same budget: Bulk Email Verification5,000 credits once for $19 ($3.80 per 1,000) · 10,000 credits once for $38 ($3.80 per 1,000) · 25,000 credits once for $79 ($3.16 per 1,000) · 50,000 credits once for $119 ($2.38 per 1,000) · 100,000 credits once for $179 ($1.79 per 1,000) · 250,000 credits once for $399 ($1.596 per 1,000) · 500,000 credits once for $599 ($1.198 per 1,000) · 1,000,000 credits once for $899 ($0.899 per 1,000)$1.58the equivalent credits of misverified emails, on a batch of 1,000+ below 99% accuracy, reported with its batch ID and bounce rate data and confirmedMailValid's email verification API checks syntax, DNS/MX records, and SMTP mailbox existence in a single REST call, returning a result in under 500ms.30 daysno limitYou agree NOT to use the Service to: Verify email addresses obtained without consent (spam, scraping, purchased lists), Violate any applicable laws, including anti-spam regulations (CAN-SPAM, GDPR, etc.), Resell, sublicense, or redistribute access to the Service without written permission, Attempt to reverse-engineer, decompile, or extract the Service's underlying technology, Exceed rate limits or attempt to disrupt the Service's infrastructure, Use the Service for any illegal, harmful, or fraudulent purpose$7950,000 credits a month50,000 calls a monthnever, unused credits roll over3.331in the call0.91 semailPOST/api/v1/verify/singleMailValid Plus 50,000 creditsanyone at least 18 years old
Hunter, $299 monthly55.93276659025$5.98monthly$299$0.0019 of 199 of 135 of 60 of 195 of 191.95 s0.38 s2.58 s0.16 s4.45 s0.42 sGET api.hunter.io/v2/email-verifier$0.011Clay: your key no Data Credits, 1 Action per call (Actions start at less than $0.01 each), paid, no fixed price · Deepline: your key free for 50,000 calls a month, then $5.00 per 1,000, paid $15.00 per 1,000 results · Monid: paid $12.25 per 1,000 results · Orthogonal: paid $10.00 · PayPerQ: paid $34.50 · treg: your key free, paid $12.25the same billing monthcallDiscover: 900 included AI searches a month · Add a recipient to a sequence: 15,000 recipients per sequence, 30,000,000 Saved Leads · from the same budget: Domain Search · Email Finder · Email Finder (Found) · Multi-Domain Search reveal · Email Enrichment · Company Enrichment · Combined Enrichment100 credits once for $5 ($25.00 per 1,000) · 1,000 credits once for $35 ($17.50 per 1,000) · 10,000 credits once for $200 ($10.00 per 1,000)$5.98Verify any email address with a simple API call.1 monthData minimization: not storing data beyond what is needed for the stated purpose.Data accessed through Hunter may be used for the following purposes: B2B outreach and prospecting: identifying and contacting relevant professional contacts at target companies for legitimate business purposes, sales, marketing, partnership, or recruitment, where the individual is being contacted in their professional capacity. [...] CRM enrichment: verifying or enriching a company’s existing B2B contact database, where the individuals are professional contacts with whom a business relationship is sought or maintained. [...] Internal research and analysis: internal analysis of company-level contact patterns for legitimate business intelligence purposes. This does not extend to bulk export of individual-level personal data for redistribution, resale, or use outside the permitted purposes in this section. [...] API integration and testing: technical integration and testing of the API using test accounts and non-production data environments. [...] The following uses are prohibited under Hunter’s Terms of Service and, in many cases, applicable law. Sending unsolicited bulk commercial email using Hunter data, in violation of CAN-SPAM, CASL, the EU ePrivacy Directive, or equivalent applicable law. [...] Contacting individuals in a harassing, threatening, or abusive manner, facilitating stalking, doxing, or targeted harassment campaigns, sharing Hunter data in contexts designed to expose individuals to harm, ridicule, or unwanted public attention. [...] Processing Hunter data in violation of applicable data protection law, combining Hunter data with special category data to build legally non-compliant profiles, sharing or reselling Hunter data to third parties without prior written authorization from Hunter. [...] Using Hunter data for political campaigning, voter outreach, or micro-targeting based on inferred political opinions. [...] Using Hunter-sourced email addresses for credential stuffing, phishing, account compromise, or social engineering attacks. [...] Contacting individuals as private consumers rather than in a professional B2B context. Hunter’s database is limited to professional contact data and must not be used for B2C marketing. [...] Using Hunter data as the sole input to automated mass outreach sequences with no individualized relevance or genuine business purpose, i.e. spam with a company name attached. [...] Under this license you may not: Build a similar or competitive service without Hunter’s prior written consent.$29925,000 credits a month50,000 calls a monthat the monthly reset, credits don't roll over51in the call or by polling1.95 semail. Optional: domain_metadataGET/email-verifierScaleanyone 18 or over (in India, businesses only)
Anysite, $49 monthly50.41887810020$130.667monthly$49$130.66719 of 1910 of 136 of 60 of 193 of 192.48 s0.83 s3.45 s0.78 s4.05 s0.29 sPOST api.anysite.io/api/emails/verify$0.1307nonecallfrom the same budget: 6,270 other calls$116.007,000 credits once for $20.30 ($116.00 per 1,000)Verify email deliverability (syntax, MX, mailbox), or return a verdict already established for it.1 yearno limitlawful, legitimate use only, no unsolicited mass messaging, and no reselling or sublicensing of the API, credits or resources without Anysite's written approval, you answer for your lawful rights to the data, the consents and data protection law, and the source sites' terms$4915,000 credits a month375 calls a monthat every renewal: unused plan credits do not carry over1in the call2.48 semail. Optional: timeoutPOST/api/emails/verifyStarteranyone at least 18 years old or of the age of majority in their jurisdiction
Skrapp, $349 monthly, Enterprise 50K, GET /v3/verify45.11760648343$6.98monthly$349$6.9819 of 199 of 133 of 60 of 197 of 191.13 s0.68 s2.08 s0.65 s2.21 s0.28 sGET api.skrapp.io/v3/verify$0.007noneno limitcallfrom the same budget: Email Finder · Bulk Email Finder · Bulk Email Verifier · Company enrich · Company bulk enrich$6.98neverCheck whether an email address is deliverable before you send to it. Add enrich=true to also get the company behind a professional address.30 daysno limityou agree NOT to carry out such behavior within the platform or using data provided by Skrapp. In this regard, it is forbidden to : Resell Skrapp services without authorization, as well as to carry out any commercial use of the information extracted using our Services. [...] Transmit the insertion of messages or advertisements without complying with the legal requirements, and / or is considered to be spam and / or carrying out spamming behaviors (sending spam or unsolicited messages). [...] Collect, or attempt to collect, personal information of a third party without their knowledge or consent and / or without compliance with applicable personal data laws and regulations and/or the Data processing agreement.$34950,000 credits a month50,000 calls a monthunused credits roll over to the next month1in the call1.13 semail. Optional: enrichGET/v3/verifyEnterprise 50Kanyone 18 or over
APIVerve, $29.99 monthly0.047082100N/A$2.999monthly$29.99$0.008 of 196 of 60 of 22 of 80 of 8Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timeGET api.apiverve.com/v1/emailvalidator$0.003nonecallfrom the same budget: 386 other calls$2.999Stop fake and mistyped emails before they reach your list.stored (MX valid, MX record, null MX, can receive mail, has SPF, has DMARC: live)You must not use the API [...] to cache, store, or redistribute Output beyond what the Documentation permitsFree plan: "Attribution required", "Non-commercial use", paid plans: "Commercial license", "No attribution required" (pricing page). Terms: "You must not use the API to build a product that materially replicates or competes with the Product itself, to exceed or evade quotas, or to cache, store, or redistribute Output beyond what the Documentation permits." [...] "you agree not to use the Products to violate any law, infringe any right, harm any person, transmit malicious code, harvest data unlawfully, circumvent security or usage limits, disrupt or overload our infrastructure, or resell or redistribute raw Product access in a manner the Product is not sold for."$29.99200,000 credits a month10,000 calls a monthcredits reset each billing cycle, no rollover151in the callemailGET/v1/emailvalidatorStarteranyone 13 or over (under 18 only with the permission of a parent or legal guardian)
Botoi, $9 monthly, Starter, POST /v1/email/validate0.08509099N/A$0.03monthly$918 of 1913 of 130 of 55 of 180 of 18Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timePOST api.botoi.com/v1/email/validate$0.00003nonecallfrom the same budget: 150 other callsValidates an email address with format checking, MX record verification, disposable domain detection, free provider detection, role-based address detection, and typo suggestions.stored (MX found, MX records: live)no limitBy obtaining and using an API key, You agree to: Keep Your API key confidential and not share it with unauthorized parties, Not exceed the rate limits associated with Your plan tier, Not use the API for any unlawful purpose or to transmit harmful content, Not attempt to circumvent authentication, rate limiting, or other security measures, Not resell or redistribute API access without prior written consent from the Company$910,000 requests a day10,000 calls a dayresets daily at midnight UTC10,0000.51in the callemailPOST/v1/email/validateStarteranyone 18 or older
EmailDetective, $19 monthly, Basic, GET /emails/{emailAddress}0.05808567N/A$0.76monthly$1919 of 1913 of 130 of 66 of 190 of 19Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timeGET api.emaildetective.io/emails/{emailAddress}$0.00076nonecallfrom the same budget: Bulk email validation · CSV email validationEmailDetective is an API that focuses on email validation and legitimacy scoring, helping to identify whether an email address is valid, gibberish, deliverable or disposable.storeda temporary copy: “Permission is granted to temporarily download one copy of the materials”, when the license ends, “you must destroy any downloaded materials in your possession whether in electronic or printed format”“By accessing this web site, you are agreeing to be bound by these web site Terms and Conditions of Use, all applicable laws and regulations, and agree that you are responsible for compliance with any applicable local laws.” [...] “Permission is granted to temporarily download one copy of the materials (information or software) on EmailDetective's web site for personal, non-commercial transitory viewing only. This is the grant of a license, not a transfer of title, and under this license you may not: modify or copy the materials, use the materials for any commercial purpose, or for any public display (commercial or non-commercial), attempt to decompile or reverse engineer any software contained on EmailDetective's web site, remove any copyright or other proprietary notations from the materials, or transfer the materials to another person or "mirror" the materials on any other server. This license shall automatically terminate if you violate any of these restrictions and may be terminated by EmailDetective at any time.”$1925,000 credits a month25,000 calls a month1in the callemailAddressGET/emails/{emailAddress}Basicanyone
Emailit, top-up from $200.05108886N/A$1.00pay first$1.0019 of 1913 of 130 of 66 of 190 of 19Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timePOST api.emailit.com/v2/email-verifications$0.001nonecallfrom the same budget: Verify an address in full mode · Create a verification list · API or SMTP email · Inbound email received · Campaign email · Automation run$1.00Verify email addresses one at a time via API or 10,000 at once. Syntax, MX, disposable, role, catch-all, mailbox checks and AI gibberish detection.stored (has MX records: live)no API termsno API terms$20100,000 credits20,000 callsnever1in the callemail. Optional: mode "fast"POST/email-verificationsPay as you goentrepreneurs acting in the course of their business
KaijuVerifier, $19 monthly, Starter, POST /api/v1/verify-single0.05708583N/A$1.90monthly$19$0.0019 of 1913 of 130 of 64 of 192 of 19Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timePOST kaijuverifier.com/api/v1/verify-single$0.0019, nothing when riskynonecallfrom the same budget: Verify a batch synchronously · Submit an async bulk job · Verify a single email with the SMTP probe (authenticated) · Verify a batch synchronously with the SMTP probe · Submit an async bulk job with the SMTP probe$2.005,000 credits once for $19 ($3.80 per 1,000) · 25,000 credits once for $79 ($3.16 per 1,000) · 100,000 credits once for $249 ($2.49 per 1,000) · 500,000 credits once for $899 ($1.798 per 1,000)$0.00the verification credits in full, when the campaign's hard-bounce rate exceeds 2% on addresses verified as ValidBlock fake signups, burner accounts, and hard bounces at the edge in 3 lines of code.stored (DNS valid, MX count, MX providers, MX grade: live)no limitYou agree NOT to use the Service for: Sending SPAM or unsolicited bulk emails, Verifying email lists obtained illegally or without consent, Any activity that violates GDPR, CAN-SPAM, or other data protection laws, Attempting to reverse engineer, hack, or abuse the Service, Reselling or redistributing verification results without authorization$1910,000 credits a month10,000 calls a monthunused monthly credits roll over to the next billing cycle, up to 1x the monthly limit1in the callemail. Optional: use_smtpPOST/api/v1/verify-singleStarteranyone
MailSift, $10 pack, Starter, GET /verify0.07809383N/A$0.40pay first$0.0019 of 1910 of 130 of 63 of 196 of 19Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timeGET mailsift.dev/api/v1/verify$0.0004nonecallfrom the same budget: Verify one email with Deep Verification · Verify up to 100 emails at once · Verify up to 100 emails at once with Deep Verification · Verify a CSV in bulk · Verify a CSV in bulk with Deep Verification$0.40MailSift is a fast, accurate email verification API and bulk CSV validator. It detects invalid, disposable, role-based, and risky email addresses using syntax, MX, SPF, DMARC, SMTP, and catch-all checks, returning a status and a 0–100 deliverability score.stored (MX, SPF, DMARC: live)no limitYou may not use MailSift to: send unsolicited email, harass individuals, build databases of contact information for sale, circumvent rate limits or terms, or for any unlawful purpose. [...] You are responsible for having a lawful basis to process the email addresses you submit, including, where applicable, consent under the GDPR. [...] We grant you a non-transferable, revocable license to use the service for its intended purpose.$1025,000 credits25,000 callsnever101in the callemail. Optional: mode, Idempotency-KeyGET/verifyStarteranyone 16 or older
Strale, top-up from €10, Prepaid wallet, POST /v1/do, Email Validation0.088092100N/Apay first19 of 1913 of 130 of 66 of 190 of 19Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timePOST api.strale.io/v1/do capability_slug email-validate$0, a free-tier capabilitynonefrom the same budget: 392 other callsValidate an email address: RFC 5322 syntax, MX records, 5,361 disposable domain detection, role-based address detection (35 patterns), free provider detection, and typo suggestion for common providers (gmial.com ? gmail.com). Returns deliverability assessment with per-check breakdown.storedno limitYou agree not to use the Service to: break the law, evade sanctions, or facilitate fraud, process personal data of EU/UK data subjects without an appropriate lawful basis, circumvent rate limits, quotas, or the Service’s authentication, resell the Service as your own or build a competing product whose primary purpose is to mirror Strale’s capability catalog, scrape or systematically extract Strale’s own metadata (capability descriptions, test results, pricing) outside of the documented public endpoints, use AI-assisted capability outputs as the sole basis for decisions with legal or significant effects on a person without human review [...] You retain all rights to the data you send to the Service and to the structured responses you receive.€10101in the callcapability_slug "email-validate", inputs.email. Optional: max_price_cents, require_fresh, dry_runPOST/v1/doPrepaid walletanyone
BigDataCloud, $79.90 monthlyN/A57N/A7567N/A$0.799monthly$79.90nonecallfrom the same budget: Phone Number Validation API · Phone Number Validation by IP Address API$0.799Accepting an invalid email address at the point of entry creates problems downstream — bounced emails, failed OTP delivery, dirty CRM data, and in some cases fraudulent signups using disposable addresses. This API validates an email address before it reaches your database.storedno limitWhenever you use our Services in any capacity you agree that you will not use them: in any manner prohibited by these terms and conditions or any other policy or set of restrictions published on our Website, for any unlawful purpose, at a frequency or in a way that is likely to make the system inaccessible to third parties, or for the purpose of creating, developing, refining or otherwise supporting a product or service that competes with our business, without our prior written permission [...] You may not at any time download, scrape or reverse engineer our services, API or Website.$79.90100,000 requests a month100,000 calls a monthno limit1in the callemailAddressGET/data/email-verifySilveranyone with an account, giving true and complete information about themselves, their business and their contact details
Bouncer, $320 monthlyN/A40N/A5583N/A$3.20monthly$320$0.00none24 hoursresultfrom the same budget: Verify email · Create batch request · Verify domain · Create toxicity list job · Email Verification$3.20money back (a credit or refund) for an address it said deliverable that bounces within 72 hours of the check, for an objective reason, not spam or soft bouncesBouncer Email Verification API lets you validate email address and verify its deliverability, in the way you want. It’s easy to integrate, powerful, robust, secure, ultrafast and affordable.24 hoursno limitIn order to use our Services, you must agree to verify only email addresses for which the Recipients have granted you verifiable permission for the messages to be sent – all Recipients must have opted-in to receive communications from you. [...] You may not use our Services to: verify email addresses without the subscriber’s permission to receive email communications from your entity, verify purchased lists (whether they are opt-in or not), verify harvested email addresses from web sites or other sources, verify permutations of email addresses, verify generated email addresses. [...] You may: verify email addresses for which a user has opted-in to receive email communications from you, verify email addresses provided by your end-users via a sign-up form. [...] As a user of the Site, you agree not to: [...] use any information obtained from the Site in order to harass, abuse, or harm another person, use the Site as part of any effort to compete with us or otherwise use the Site and/or the Content for any revenue-generating endeavor or commercial enterprise [...], use the Site in a manner inconsistent with any applicable laws or regulations.$320100,000 credits a month100,000 results a monthnever1.6710,000in the callemail. Optional: Content-TypePOST/v1.1/email/verify/batch/syncMonthly Subscription, 100,000 creditsanyone 18 or over with a work email, a private one (Gmail, Hotmail) only after writing to Bouncer first
BounceZero, $6 pack, Starter, POST /verify/batchN/A47N/A9380N/A$3.00pay first$0.00noneresultfrom the same budget: Verify Single Email · Verify Realtime (SSE) · Verify Bulk (JSON) · Verify Bulk (CSV Upload)$3.00Integrate email verification directly into your sign-up forms, CRM pipelines, and data workflows with a single API call. BounceZero returns 65+ signal fields in JSON - including classification, score, SMTP result, catch-all status, and plain-English explanation.7 daysno limitYou may not access or use the Services for any purpose other than that for which we make the Services available. The Services may not be used in connection with any commercial endeavours except those that are specifically endorsed or approved by us. As a user of the Services, you agree not to: [...] Systematically retrieve data or other content from the Services to create or compile, directly or indirectly, a collection, compilation, database, or directory without written permission from us. [...] Use any information obtained from the Services in order to harass, abuse, or harm another person. [...] Use the Services in a manner inconsistent with any applicable laws or regulations. [...] Use the Services to validate email addresses for the purpose of sending unsolicited commercial email (spam) in violation of applicable anti-spam legislation, including but not limited to the CAN-SPAM Act, GDPR, and PECR.$62,000 credits2,000 resultsnever, as long as your account stays active1.67100in the callemailsPOST/verify/batchStarteranyone 18 or over with the legal capacity to accept the terms
Byteplant, $661 monthly, Monthly, 50,000 credits, POST /api/bulk-verifyN/A$13.22monthly$661noneresultfrom the same budget: Real-Time Email Verification APIThe Bulk API allows you to upload up to 100K email addresses for validation with a single API request.storedno limitThe Customer is granted a non-exclusive right to use the services to the agreed extent. The offered services are intended for normal business use. [...] The Customer shall not exceed the agreed scope of use of the services, allow third parties to use them, or make them accessible to third parties. In particular, the Customer is not permitted to reproduce, sell, or temporarily lease the underlying software or parts thereof, or to rent or loan the software or access to the services. [...] Byteplant may revoke the Customer's access authorization and/or terminate the contract if the Customer significantly exceeds the permitted use, significantly deviates from normal usage, or if there are indications that the Customer is not using the services in accordance with the contract (e.g., Namespace Mining).$66150,000 credits a month50,000 results a monthnever, unused credits roll over100,000by polling or webhookRequest Body (file). Optional: TaskName, ValidationMode, NotifyEmail, NotifyURLPOST/api/bulk-verifyMonthly, 50,000 creditsbusinesses and professionals with a business email
ContactOut, contact us, Team / API, POST /v1/email/verify/batchN/Acontact$0.00noneresultLinkedIn Profile API from LinkedIn URL · LinkedIn Profile API from email address · People Enrich API · Contact Info API - Single · Contact Info API - Bulk · Company information from domains · People Search API · Decision Makers API · Company Search API · Email to LinkedIn API · Hashed Email API · People Count API · Contact Checker API - Personal Email Checker · Contact Checker API - Work Email Checker · Contact Checker API - Phone Number Checker · from the same budget: Email Verifier API - SingleVerify your email list to Reduce bounce rates, Protect sender reputation and Reach high-quality prospects1 hourgoverned by the subscription agreement and subscription order form entered into between you and ContactOut, they prevail over its Terms of Usegoverned by the subscription agreement and subscription order form entered into between you and ContactOut, they prevail over its Terms of Use16.67100by polling or webhookemails. Optional: callback_urlPOST/v1/email/verify/batchTeam / APIanyone
EasyEmailAPI, freeN/A$0.00free$0.0019 of 1913 of 130 of 66 of 190 of 19Nothing to timeNothing to timeNothing to timeNothing to timeNothing to timeNothing to timeGET easyemailapi.com/api/verify/{email}$0.00019nonecallnothing elseCheck email syntax, MX records, disposable addresses, and free email providers before accepting a signup. Integrate email validation into your backend with a JSON API, Pro adds SMTP inbox and catch-all checks.stored (valid MX, MX: live)no limitfree of charge for both personal and commercial use, within the limits and fair-use policies described here [...] You agree not to: Use the Service for unsolicited or bulk email activity (spam). Circumvent rate limits or disrupt Service availability. Resell or redistribute API access without written permission. We reserve the right to suspend or limit usage that negatively impacts performance or security.$05,000 requests a month5,000 calls a month1in the callemailGET/api/verify/{email}Freeanyone
Elastic Email, $29 monthly, Email API Starter (100,000 emails/month), POST /verifications/filesN/A77N/A8297N/A$0.29monthly$29noneresultSend Bulk Emails: 100,000 emails per month · View Email · Get Status · Send Bulk Emails CSV: 100,000 emails per month · Send Transactional Email: 100,000 emails per month · Get Suppressions · Get Suppression · Delete Suppression · Get Bounce List · Add Bounces · Add Bounces Async · Get Complaints List · Add Complaints · Add Complaints Async · Get Unsubscribes List · Add Unsubscribes · Add Unsubscribes Async · Load Events: 3 days of email logs · Load Email Events: 3 days of email logs · Load Channel Events: 3 days of email logs · Export Channel Events: 3 days of email logs · Check Channel Export Status · Export Events: 3 days of email logs · Check Export Status · Load Statistics · Load Campaigns Stats · Load Campaign Stats · Load Channels Stats · Load Channel Stats · from the same budget: Verify Email · Start verificationValidate and optimize your email lists at once. Boost deliverability, reduce bounces, and enhance your email sending performance with our precise verification tool.storedno limitYou agree that you will at all times use the Services in a manner consistent with: these Terms, the Acceptable Use Policy, any other applicable rules, policies, and guidelines established by Elastic in respect of the Services. [...] You represent and warrant that your use of the Services will comply with all applicable laws and regulations, including, without limitation, all applicable anti-spam and privacy laws [...] you will not send any emails other than Transactional Messages (as defined in Section 2.4) unless the email recipients have provided you with valid consent under the Regulations to receive communications from you. [...] Do not send email to purchased, rented or third-party email lists of any kind.$29100,000 requests a month100,000 results a monththe limit resets each month, along with the billing cycle20by pollingfilePOST/verifications/filesEmail API Starter (100,000 emails/month)anyone at least the age of majority in their jurisdiction, with a registered account
Email Hippo, $468 monthlyN/A23N/A620N/A$4.68monthly$468$4.68nonecallnothing else$4.68Verify emails instantly with Email Hippo MORE. Prevent fake sign-ups, reduce fraud, and improve data accuracy with our secure, high-speed API.30 daysno limitsolely for Your internal business purposes. For the avoidance of doubt, You may not: (a) Modify, change or create any derivative works of Email Hippo Services, including translation or localization, (b) Copy, decompile, disassemble, decrypt, reverse engineer, or otherwise attempt to derive the source code for Email Hippo Services, (c) Redistribute, encumber, sell, rent, lease, sublicense, display, publish, disclose or otherwise transfer rights to Email Hippo Services, in whole or in part, to any other person or entity, (d) Remove or alter any trademark, logo, copyright or other proprietary notices, legends, symbols or labels in Email Hippo Services, (e) Permit any unauthorized person to access or use the Email Hippo Services or use the Hosted Services to provide services to third parties, (f) Interfere with or disrupt the integrity or performance of the Email Hippo Service or Hosted Services or the data contained therein, or (g) Attempt to gain unauthorized access to the service or its related systems or networks or make any alteration to the Platform, except as permitted by the documentation. You agree to comply with all applicable laws and regulations in connection with Your use of Email Hippo Services$468100,000 requests a month100,000 calls a monthat each 30-day quota reset, no rollover1in the calleGET/v3/more/json/{k}/{e}MORE 100,000 Edition 2 (Monthly)anyone, as an individual or a duly authorized representative for an entity (USD, GBP or EUR set by country)
FirstSales, freeN/A100N/A10095N/A$0.00free$0.00nonecallScore an email domain for disposable/temporary-mailbox risk · Detect whether a domain accepts mail to any mailbox (catch-all) · Run one specific DNS/email-authentication/security check against a domain · Look up and validate a domain's DKIM record · Run SPF, DKIM, DMARC, and MX checks together with a confidence score · Reverse-DNS (PTR) lookup for an IPv4 address, with forward-confirmation · Get a domain's registration age and expiration via RDAP · Fetch every DNS record type for a domain in one call · Discover subdomains via Certificate Transparency logs · Score email content for spam-trigger risk · Score and improve a cold-email subject line · Grade a full cold-email draft across 8 deliverability/effectiveness dimensions · Score and improve a cold-email body · Detect and score personalization signals in cold-email content · Create a temporary test inbox · Read the received emails for a test inbox · List public tutorials · Get one tutorial by slug · Service health checkCheck email addresses, DNS records and cold email copy from your own code, with no key.storedno limitYou agree to use the Service only for lawful B2B commercial outreach, and to follow all laws and regulations that apply. You must not do any of the following: [...] Resell, sublicense or white-label the Service, or make it available to anyone else, without written permission from FirstSales first. [...] Use automated scripts, bots or other tools to put artificial load on, overload or interfere with the Service's systems or the systems of mailbox providers. [...] Get around or turn off any rate limits, sending caps or security controls built into the Service.$00.331in the callemailPOST/api/v1/email/validatePublic, no keyanyone at least 18 years old, for B2B commercial use only
IP-API.io, €10 monthlyN/A84N/A8989N/A$0.113monthly$11.25nonecallAdvanced email validation: 10,000 requests a month · from the same budget: IP geolocation · Batch IP lookup · Risk score · DNS lookups · Domain lookups · Tor detection · IP reputationGeolocation, ASN, fraud detection, email validation, and threat intelligence — all via one fast, reliable API.storedno API termsno API terms€10100,000 requests a month100,000 calls a month1in the callemailGET/api/v1/email/{email}Smallanyone
Mailgun, $455 monthly, Foundation, 50,000 emails a month, next 50,000 validations, POST /v4/address/validate/bulk/{list_id}N/A22N/A6267N/A$5.00monthly$455noneresultSend email API (50,000 emails a month) · from the same budget: Single ValidationSee better results from your email list. Embed our email validation API into your site, form, or application to automatically verify all incoming addresses before you hit send.storedno limitYou may use the Services for commercial and professional purposes only [...] With respect to any of the Services' email verification features or functionality, you may not: use the Services to verify the email address(es) of any person who has not affirmatively consented (i.e., opted-in) to, or who has expressly opted-out from receiving email communications from you, use the Services to validate email addresses that were purchased, rented or similarly obtained from a third party (i.e., third party email lists), or, use the Services to harvest or generate email addresses or otherwise determine the existence of unknown email addresses$455from the 50,001st result a month5no limitby polling or webhooklist_id. Optional: filePOST/v4/address/validate/bulk/{list_id}Foundation, 50,000 emails a month, next 50,000 validationsprofessional use only, not minors under the age of 18
SalesQL, $119 monthlyN/A20N/A7280N/A$5.95monthly$119$5.95nonenevercallEnrich Person: 12,000 credits a month · Email Lookup Person: 12,000 credits a month · Bulk Enrich Persons: 12,000 credits a month · from the same budget: Bulk Verify Emails$5.95Reduce bounce rates and ensure your emails reach real inboxes with our reliable email verifier.120 daysright to access Profile Data through the Services for the Customer's internal business purposes during the Subscription Term [...] On termination of these Terms or expiry of the Subscription Term: [...] the Customer must cease all use of Profile Data obtained from the Services, except for Profile Data that the Customer has lawfully integrated into its own systems and is processing as an independent controller in accordance with applicable law and these Terms [...] Where SalesQL informs the Customer that a Business Contact has objected to processing or has been removed from the Profiles Database, the Customer will, without undue delay, suppress that Business Contact's data in the Customer's own systemsSalesQL grants the Customer a limited, non-exclusive, non-transferable, revocable right to access Profile Data through the Services for the Customer's internal business purposes during the Subscription Term. [...] The Customer must not, and must not allow any End User or third party to: access or use the Services in violation of applicable law, third-party rights, or these Terms, copy, modify, translate, adapt or create derivative works of the Services or the Profiles Database, except as expressly permitted, [...] create or operate multiple Accounts (including under different identities, email addresses or organisations) to obtain additional free-tier or promotional credits, or to evade rate limits, credit limits, suppressions or other restrictions under these Terms or the AUP (see the AUP, Section 4), access, scrape, copy or download the Services or the Profiles Database in bulk, including by means of automated tools other than SalesQL's official API or MCP Server used in accordance with the Documentation and the applicable rate limits, resell, sublicense, rent, lease, distribute or transfer the Services or the Profiles Database to any third party, or use the Services to provide services to third parties on a service-bureau, white-label or hosted basis, [...] attempt to circumvent any security, authentication, rate-limit, or access-control mechanism of the Services, [...] use the Services to develop a competing product or to benchmark the Services for the purpose of building a competing product. [...] the Customer must not: use Profile Data to build or contribute to a competing B2B contact database, sales-intelligence platform or data broker, combine Profile Data with consumer data or other data sets in a way that would create a profile for non-business purposes, use Profile Data for credit, employment, housing or insurance decisions, sell, license or otherwise commercialise Profile Data to third parties. [...] The Customer will not use the Services to target Recipients on the basis of, or to send communications relating to, special categories of personal data, including health, religion, political opinions, sexual orientation, trade-union membership, or other categories that benefit from heightened protection under applicable law, except where the Customer has obtained the explicit consent of the Recipient or has another valid lawful basis. The Customer will not use the Services for any of the following purposes: consumer-targeted marketing, except where the Recipient has provided informed consent under applicable laws, communications relating to gambling, adult content, weapons, controlled substances, get-rich-quick schemes, multi-level-marketing schemes, or fraudulent or deceptive schemes, harassment, threats, defamation, hate speech or unlawful discrimination, communications targeting individuals identified as employed by, or affiliated with, government, judicial, military, intelligence or law-enforcement institutions in their capacity as such, where such targeting would constitute interference with public functions under applicable law, communications relating to political campaigns or elections, except where the Customer is registered with the applicable electoral authorities and has complied with all applicable election laws, communications relating to personal injury solicitation, debt collection, or consumer financial products, except where the Customer is licensed to engage in those activities under applicable law, any other purpose prohibited by the AUP. [...] Data accessed or generated through a Customer-Authorized Tool is used exclusively by the Customer and its End Users for the Customer's internal business purposes, and is not redistributed, resold, sublicensed, made available, or otherwise disclosed to any third party, including the operator of the Customer-Authorized Tool except as strictly necessary for the technical operation of that tool on the Customer's behalf. [...] Making automated requests against non-public or undocumented endpoints is prohibited and can result in account suspension.$11920,000 credits a month20,000 calls a month1in the callemailPOST/emails/verifyPremiumat least 18 years old and capable of entering into a legally binding contract, for businesses and other organisations, not for personal, family or household use
StableEnrich, pay as you goN/A87N/A830N/A$0.005pay as you gononeresultnothing elseCheck if email addresses exist in the Minerva database. Returns validation status and last-seen timestamp. Use before resolve/enrich to pre-screen lists.1 dayas the terms of the provider whose data it is say ("Third-party data is subject to the respective provider's terms and conditions"), StableEnrich's own setting no limit: PDL People Enrich's, People Data Labs': "Data returned in API endpoints may not be saved in Customer databases (“Cached Data”) for longer than necessary to perform actions permitted via Service License.", Minerva Enrich's, Minerva's, until the agreement ends: "Upon expiration or termination of this Agreement: (i) the rights granted pursuant to Section 4(a) [...] will terminate"StableEnrich's terms, 4. Acceptable Use: "You agree to use the Service only for lawful purposes. You shall not:" "Use data obtained through the Service to harass, stalk, or harm individuals", "Violate any applicable laws, including data protection and privacy regulations", "Resell or redistribute data in a manner that violates upstream provider terms", "Attempt to circumvent payment requirements or exploit vulnerabilities in the Service", "Use the Service for spam, phishing, or fraudulent activities", 5: "Third-party data is subject to the respective provider's terms and conditions.", 6: "Your use of such data is subject to their terms. You may not claim ownership of data retrieved through the Service or use it in ways that infringe on third-party rights.", Merit Systems' terms, 8. Acceptable Use: "You may not use the Services to:" "violate any law, regulation, court order, sanction, or third-party right", "harass, threaten, stalk, defame, exploit, or harm any person or entity", "send spam, phishing, robocalls, deceptive outreach, or malware", "scrape, enrich, surveil, profile, or use personal data in a manner that is unlawful, discriminatory, abusive, or without any required consent or lawful basis", "impersonate another person or entity or misrepresent affiliation, authority, or origin", "generate, host, upload, send, distribute, or facilitate illegal, infringing, fraudulent, or harmful content", "use the Services or any output, data, enrichment, score, ranking, recommendation, or other result as a consumer report, investigative consumer report, or for determining a person's eligibility for employment, hiring, contracting, compensation, credit, lending, underwriting, housing, insurance, education, government benefits, licenses, immigration status, or any other purpose regulated by the Fair Credit Reporting Act or analogous law", "evade payment requirements, fees, rate limits, moderation systems, anti-abuse controls, or access restrictions", "probe, attack, reverse engineer, interfere with, or degrade the Services or supporting infrastructure, except to the extent prohibited by applicable law", "use the Services for emergency services, weapons, unlawful surveillance, or other prohibited high-risk use cases.", "You are solely responsible for ensuring that your conduct, communications, content, inputs, data sources, automations, and downstream use of outputs comply with all applicable law.", 7: "You are solely responsible for verifying legality, consent, accuracy, and downstream rights before using any result.", PDL People Enrich's data, People Data Labs' Services Subscription Agreement: 2.2.1 "a limited, revocable, non-exclusive, non-transferable, non-sublicensable right to license, access, and use the Data provided to Customer during the Subscription Period for the following purposes: (i) to display PDL-supplied Data to Customer’s own clients who engage with the data (“End Users”) on Customer’s platform or within Customer’s product, (ii) to maintain PDL-supplied Data in Customer’s database for the purpose of performing calculations and mapping PDL Data against Customer Data (as defined in 11.2), (iii) for any permitted uses outlined in Customer Order Form.", 1.3 "Cached Data may not be provided or displayed to more than one End User.", 2.6.1 "Customer shall not, and shall not permit any client or third party that may have access to the Data to: (i) resell, sublicense, distribute or otherwise provide access to the Services, Data, or information contained in or derived from the Services, to any third party or use the Services outside the scope of the license granted herein, (ii) copy, modify, adapt, translate, prepare derivative works from, reverse engineer, disassemble, or decompile the Services or otherwise attempt to discover any source code or trade secrets related to the Services, or (iii) use the trademarks, trade names, service marks, logos, domain names and other distinctive brand features or any copyright or other proprietary rights associated with the Services for any purpose without the express written consent of PDL.", 2.6.2 "Customer may not use, resell, authorize or permit anyone to use, license, or make available Data they obtain from PDL, for any purposes prohibited in the Acceptable Data Use Policy.", 2.6.3 "Customer may not build products from the Data that resemble or compete with PDL products. (I.e. Customer may not provide programmatic access to the Data to End Users in any way that would allow them access to any substantial set of the Data features or a material portion of the Data.)", 2.9 "FCRA uses are prohibited in the ADUP.", its Acceptable Data Use Policy: "you agree not to use, and not to encourage or allow any client or End User to use, the PDL Services in the following prohibited ways:" "In connection with or in any way encourage any illegal, fraudulent, abusive, or similar activities.", "To promote or advertise guns, ammunition, or weapons, adult content or services (such as pornography), credit repair services, payday loan services, tobacco or marijuana products except with prior signed authorization from People Data Labs.", "To promote or advertise any product or service that violates intellectual property rights, such as the sale of counterfeit products.", "To promote particular company stock purchases.", "For any form of debt collection.", "For hard background check purposes.", "To determine eligibility for a government license or benefit.", "To “re-identify” pseudonymous information (such as a cookie identifier) by merging it with personally identifiable information (such as an email address).", "For any purpose prohibited by applicable data privacy and security laws, including the General Data Protection Regulation (Regulation (EU) 2016/679) (“GDPR”), the California Consumer Privacy Act or any similar state or national laws.", "For the purposes of training Gen AI systems or models that can generate derived synthetic content, including text, images, video, and audio, that emulates the structure and characteristics of the system’s training data.", "For the benefit of any one political candidate, political party, political campaign or advocacy group affiliated exclusively with or formed to benefit any one political candidate, political party or political campaign.", "To benefit any government agency operating as an intelligence agency to support national security, military, and foreign policy objectives.", "Any evidentiary purpose related to law enforcement or criminal prosecution, such as to establish as an evidentiary matter that a particular person is associated with a particular data element (as you understand that such data elements may be subject to errors in accuracy, currency or transcription), provided that (subject to the foregoing restriction) such data may be used for investigative, analytics or validation purposes.", "In connection with any purpose covered by the Fair Credit Reporting Act, 15 U.S.C. Sec. 1681 et seq. ("FCRA"), Federal Trade Commission interpretations of the FCRA, and similar federal and state statutes including for any purposes enumerated in the FCRA in lieu of obtaining a Consumer Report, or use or provide services or data provided by PDL for the preparation of a Consumer Report or in such a manner that may cause such data to be characterized as a Consumer Report.", "Customer agrees that it will not use or provide any data or services it receives from PDL:" "In connection with establishing a consumer's eligibility for credit or insurance to be used primarily for personal, family or household purposes, or in connection with assessing risks associated with existing credit obligations of a consumer", "For the purpose of evaluating a consumer for employment, promotion, reassignment or retention as an employee", "For any tenancy verification or in connection with any application to rent real property", "In connection with a determination of a consumer's eligibility for a license or other benefit that depends on an applicant's financial responsibility or status", "As a potential investor or servicer, or current insurer, in connection with a valuation of, or assessment of credit or prepayment risks associated with, an existing credit obligation", "In connection with any information, service or product sold or delivered to a “Consumer” (as that term is defined in the FCRA) that constitutes or is derived in substantial part from a Consumer Report", "In connection with eligibility for any government benefit or service", "For any eligibility decision made by a government pertaining but not limited to assistance to natural persons for housing, food, energy, health care, licensure, education, medical costs or any other form of government assistance or benefit.", "For any other purpose under the FCRA", "Customer agrees it will not take any “Adverse Action” (as that term is defined in the FCRA), which is based in whole or in part on PDL's services or data, against any Consumer.", Minerva Enrich's data, Minerva's Terms of Service: 4(a) "right to use (and permit Authorized Users to use) the Services and Output Data in accordance with the Documentation and the terms of this Agreement for Customer’s internal business purposes.", 4(b) "Customer will not and will not permit any person or entity (including, without limitation, Authorized Users) to, directly or indirectly:" "I. Use the Services or Output Data to develop or supplement a “Consumer Report” that is subject to the Fair Credit Reporting Act, as a factor in establishing an individual’s eligibility for credit or insurance to be used primarily for personal, family or household, or employment purposes, or for any other permissible purpose authorized under the Fair Credit Reporting Act for Consumer Reports, " "II. Copy, modify or create any derivative work of any portion of the Services, Output Data or the Documentation, " "III. Reverse engineer, decompile, decode, or disassemble or otherwise attempt to derive or gain improper access to any software component of the Services, in whole or in part, " "IV. Frame, mirror, sell, resell, market, sublicense, publish, distribute, reproduce, assign, transfer, rent, lease or loan any portion of the Services or Output Data to any other person or entity, or otherwise allow any person or entity to use the Services or Output Data for any purpose other than for the benefit of Customer in accordance with this Agreement, " "V. Use the Services, Output Data or Documentation in any manner or for any purpose that infringes, misappropriates, or otherwise violates any Intellectual Property Rights or other right of any person or entity, or that violates any applicable law, " "VI. Interfere with, or disrupt the integrity or performance of, the Services, or any data or content contained therein or transmitted thereby, " "VII. Access or search the Services (or download any data or content contained therein or transmitted thereby, including Output Data) through the use of any engine, software, tool, agent, device or mechanism (including spiders, robots, crawlers, or any other similar data mining tools) other than software or Services features provided by Minerva for use expressly for such purposes, " "VIII. Provide any Submitted Data that is considered “sensitive personal information”, “sensitive data”, or another analogous term under applicable laws, " "IX. Use the Services or Output Data in any manner that is unlawful, illegal, discriminatory, or harms (whether physically or emotionally), deceives, defrauds or misleads a third party, Minerva, its service providers, suppliers or any other user, including, without limitation: (A) Any use for improper investment purposes in any entity whose information appears as part of the Services or Output Data, (B) Any use to advertise or promote any goods or services (or send any other communications) that are illegal in the place offered or consumers, (C) Any use to advertise or promote adult service (such as pornography or escort services), tobacco products, illegal gambling, counterfeit or pirated goods or services, or violate any securities or commodities regulations (such as to support a “pump and dump” scheme), (D) Any use to communicate or transmit content that is defamatory, dishonest, obscene, sexually explicit, pornographic, vulgar or offensive, (E) Any use to promote or engage in discrimination, racism, harassment or hate speech against any individual or group, (F) Any use to threaten or promote violence, (G) Any use to locate suspects in a civil or criminal lawsuit in order to develop a news story, (H) Any use to track down victims of fraud, their family members or friends to develop a news, (I) Any use to locate lost loves, friends, family members or for personal reasons (dating, etc.), (J) Any use to search for individuals involved in an adoption (children, parents, siblings, etc.), (K) Any use to locate personal information on well-known/high-profile celebrities or government officials, (L) Any use in connection with credit repair services, to locate previous debtors or to assist in the determination of whether or not to file a personal lawsuit or judgment against the subject of the report, (M) Any use to access individual reference data on oneself or out of personal curiosity, " "X. Use the Services or any Output Data to send marketing communications to individuals about whom Output Data relates unless Customer has independently obtained consent for such marketing communications directly from the individuals or such marketing communications are otherwise permitted by applicable laws, " "XI. Use the Services in such a way that you would be deemed to be engaging in the offering or solicitation of investments in securities, " "XII. Use, extract, download or retrieve Output Data, in whole or in part, to train or finetune an artificial intelligence system, or to provide or reproduce Output Data, in whole or in part, as a prompt or input to any such system, "per call2,000in the callrecordsPOST/api/minerva/validate-emailsPay per request with x402 or MPPanyone 18 or over, not in a jurisdiction where use is prohibited, paying in USDC from a wallet on Base, Solana or Tempo
Sweep Emails, $11.99 monthlyN/A45N/A890N/A$1.845monthly$11.99nonecallnothing elseSweep Emails API verifies email validity and detects disposable providers in real-time, giving you clean data, reduced fraud, and higher conversion rates.storedno API termsno API terms$11.996,500 requests a month6,500 calls a month1in the callemail, Content-Type header "application/json"POST/v1/checkProfessionalanyone
UserCheck, $100 monthlyN/A95N/A7367N/A$0.20monthly$100$0.00nonecallfrom the same budget: Domain lookup · Gates decision$0.20Check new signups, existing users, and imported lists with one API call that returns every signal you need, including disposable email detection that catches domains public blocklists miss.storedno limitYou may not use our Services: For unlawful purposes, To support spam or fraud, To damage or impair our services, In violation of any applicable laws. You may not resell, sublicense, share, or redistribute UserCheck data or API results to third parties without our written agreement. This includes incorporating our data into products or services used by others.$100500,000 credits a month500,000 calls a monthat the start of each billing cycle, unused credits do not roll over151in the callemail. Optional: include_mxGET/email/{email}Pro 500kanyone aged 16 or over, or the age of consent in their jurisdiction
X402 Farm, pay as you goN/A22N/A1000N/A$5.00pay as you gononecallnothing elseCheck whether an email address is well-formed and its domain can receive mail, before you send.storedno API termsno API termsper call1in the callemailGET/v1/email/verifyx402 pay per callanyone
Anysite, free
APIVerve, free
BigDataCloud, free
Botoi, free, Free, POST /v1/disposable-email/check
Botoi, free, Free, POST /v1/email/validate
Botoi, free, Free, POST /v1/email-mx/verify
Bouncer, free
BounceZero, free, Free, POST /verify/batch
BounceZero, free, Free, POST /verify/bulk/upload
BounceZero, free, Free, POST /verify/bulk
BounceZero, free, Free, POST /verify/realtime
BounceZero, free, Free, POST /verify
Byteplant, free, Trial, POST /api/bulk-verify
Byteplant, free, Trial, GET /api/verify
ContactOut, contact us, Team / API, GET /v1/email/verify
Elastic Email, free, Email API Free
Email Hippo, free
EmailDetective, free, Free, POST /emails
EmailDetective, free, Free, POST /emails/csv
EmailDetective, free, Free, GET /emails/{emailAddress}
Emailit, free
Hunter, free
IP-API.io, free
KaijuVerifier, free, Free, POST /api/v1/jobs
KaijuVerifier, free, Free, POST /api/v1/verify-batch
KaijuVerifier, free, Free, POST /api/v1/verify-single
Mailgun, $15 monthly, Basic, 10,000 emails a month, POST /v4/address/validate/bulk/{list_id}
Mailgun, $15 monthly, Basic, 10,000 emails a month, GET /v4/address/validate
MailSift, free, Free, POST /verify/bulk
MailSift, free, Free, GET /verify
MailSift, free, Free, POST /verify/batch
MailValid, free, Free, POST /api/v1/verify/bulk
MailValid, free, Free, POST /api/v1/verify/single
SalesQL, $79 monthly
Skrapp, $349 monthly, Enterprise 50K, GET /v3/verify_bulk
Strale, free, trial credits, POST /v1/do, Bulk Email Validation
Strale, free, trial credits, POST /v1/do, Email Validation
Sweep Emails, free
UserCheck, free
X402 Farm, free

Best GTM APIs

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