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BillionVerify pricing and alternatives: email verification API, POST /verify/single

BillionVerify's sitellms.txtBest email verification API in 2026
67% complete: 4 of the 6 key fields we checkSee the 6 fields
$1.00per 1,000 emailsHalf of the 1,712 plans we rank by price cost $2.632 per 1,000 or less. This plan costs less than 77% of the 1,712 plans.The cheapest plan we rank by price is treg, top-up from $10, at $0.00 per 1,000.
Plan: Starter one of BillionVerify's 18 plans
Call: POST /verify/single one of BillionVerify's 3 calls
API: Email verification API BillionVerify's only API

About this item

  • Live. The call checks the email when you make it.
  • 4 of the 6 key fields we check. Address, Deliverability, Confidence, Company.
  • A pack you buy once. You pay $20 for 20,000 credits, enough for 20,000 calls. Credits never expire.
  • One call. You send email to POST /verify/single. You can also send check_smtp, force_refresh and include_domain_reputation. The call returns whether the address takes mail.
  • Who can get it: with conditions. Keep data: no limit. Use data: with conditions.

BillionVerify: email verification API alternatives

We list other providers' plans closest to this plan in price per 1,000 emails. Each plan in the table gives live data.

This planBillionVerify, $20 pack, Starter, POST /verify/singleVerimail, $100 packOneShot, pay as you goDeBounce, top-up from $200, 200K credits, GET /v1/, Single email validationNeuralVerge, $50 monthly
$ per 1,000$1.00$1.00$1.00$1.00$1.00
Completeness67%50%33%50%50%
Billingpay firstpay firstpay as you gopay firstmonthly
Pay$20$100per call$200$50
Enough for20,000 calls100,000 callsas many as you pay for200,000 calls50,000 calls a month
Freshnesslivelivelivelivelive
Who can get itanyone at least 18 years old and legally able to enter into a contract, for their internal business purposes onlybusinesses and professionals, not directed at anyone under 18anyone, consumer or business, not in a country under a U.S. government embargo or on a U.S. restricted-party list, paying each call from a wallet on Base in USDC or ETHanyone over 18business and professional use, 18 or over

Every email verification API provider we score, ranked

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-20.

  1. api.billionverify.com/openapi.yaml
  2. billionverify.com/docs/api-reference.md
  3. billionverify.com/email-verification-api.md
  4. billionverify.com/help.md
  5. billionverify.com/help/disposable-emails-are-free.md
  6. billionverify.com/help/do-credits-expire.md
  7. billionverify.com/help/no-charge-for-recheck-within-24h.md
  8. billionverify.com/help/what-does-catch-all-mean.md
  9. billionverify.com/help/which-results-are-charged.md
  10. billionverify.com/llms-full.txt
  11. billionverify.com/llms.txt
  12. billionverify.com/pricing
  13. billionverify.com/pricing.md
  14. billionverify.com/terms

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

  • Address
  • Deliverability
  • Confidence
  • Name, not in the answer
  • Place, not in the answer
  • Company
Price
$ per 1,000$1.00
Billingpay first
Aggregators
Aggregatorsnone
Charges
Repeat free24 hours
Percall
Also pays forfrom the same budget: Batch Email Verification · File Upload Verification · Email Finder · Bulk Email Finder · Company Search
Not found
$ per 1,000$0.00
Catch-all
$ per 1,000$1.00
In their words
Their pitchReal-time email verification API over HTTP with full SMTP mailbox checks — the accurate verification API for deliverability, not format-only validation.
Data
Freshnesslive
Keep datano limit
Use dataYou may not use the Service to: Violate anti-spam, privacy, consumer protection, or data protection laws. Submit data you do not have the lawful right to process. Abuse promotional offers, bypass rate limits, probe our systems, or attempt unauthorized access. Reverse engineer, copy, resell, sublicense, or build a competing service using the Service except as expressly permitted by us in writing. [...] Subject to these Terms, we grant you a limited, revocable, non-exclusive, non-transferable right to use the Service for your internal business purposes.
Plan
Pay$20
You get20,000 credits
Enough for20,000 calls
Expiresnever
Rate limit
Per second100
Batch1
Speed
Answerin the call
The call
You sendemail. Optional: check_smtp, force_refresh, include_domain_reputation
MethodPOST
Path/verify/single
About the plan
PlanStarter
Who can get itanyone at least 18 years old and legally able to enter into a contract, for their internal business purposes only
The 29 fields the plan's answer can hold

email, status, score, deliverable, disposable, catch-all, role address, free email, domain, domain age, MX records, MX IP, MX ASN, MX AS organization, domain reputation, SMTP checked, SMTP result, catch-all evidence, reason, did you mean, alias of, risk reasons, SMTP response, response time, credits used, verification mode, retryable, SMTPUTF8, retry after seconds

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