# LeadX, contact us: Email verification API

> Email validation returns Valid, Invalid, Risky, or Unknown so you can decide what belongs in an outreach list.

LeadX's email verification API on its Contact sales plan. LeadX's docs list 2 of the 6 key fields we check: Address, Deliverability.
We haven't run LeadX through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
LeadX gives this plan's price on request. We rank 3,952 plans for email verification APIs by price. Half the plans cost $1.999 per 1,000 emails or less.
[treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers.
[Disify's $9 monthly plan (/email)](https://datacircle.dev/validate-email-apis/disify/9-monthly-starter-post-email/llms.txt) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.
[pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt), [MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt) and [Giggal](https://datacircle.dev/validate-email-apis/giggal/39-pack-50000-credits-post-v1-verify/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/leadx/contact-us
- [Email validation API: 200+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://leadx.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: Docs on request from sales
- API key: with the plan, on https://leadx.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://docs.leadx.com/guides/find-and-verify-a-contact?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#validate-an-email
- Sold by: LeadX (https://leadx.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 33%
- Address: ✓
- Deliverability: ✓

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## In their words

- Their pitch: Email validation returns Valid, Invalid, Risky, or Unknown so you can decide what belongs in an outreach list.

## Data

- Keep data: no limit
- Use data: You may use the services for lawful internal business purposes, including prospecting, account research, lending and underwriting support, CRM enrichment, portfolio monitoring, data enrichment, and related B2B workflows, subject to your plan, order form, documentation, and applicable law. [...] Unless LeadX expressly agrees in writing, you may not use the services or data: As a consumer report or for any purpose regulated by the Fair Credit Reporting Act. To determine consumer eligibility for credit, insurance, employment, housing, tenancy, education, government benefits, or similar decisions. To make decisions based on protected characteristics or in a way that violates anti-discrimination, privacy, marketing, telemarketing, spam, or data-protection laws. To contact individuals or businesses in violation of CAN-SPAM, TCPA, state privacy laws, do-not-call rules, or other applicable outreach requirements. To build, train, or improve a competing data product or service unless expressly permitted in a written agreement. [...] You may not attempt to bypass limits, overload systems, scrape unauthorized areas, interfere with service operation, or use the API in a way that harms LeadX, our customers, data providers, or third parties. [...] You may not: Reverse engineer, decompile, copy, modify, or create derivative works of the services except as permitted by law. Share, resell, sublicense, publish, or distribute the services or data except as permitted by your agreement. Use the services to transmit malware, infringe rights, harass others, or conduct unlawful activity. Remove proprietary notices or misrepresent the source, quality, or permitted use of LeadX data. Access the services using automated methods not authorized by LeadX.

## Rate limit

- Per second: 1
- Concurrent: 10
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: Docs on request from sales

## About the plan

- Plan: Contact sales
- Who can get it: customers with a LeadX account, set up by booking a demo or contacting sales

## The 4 fields the plan's answer can hold

success, email, email status, MX record

## LeadX's plans (1)

- [LeadX, contact us](https://datacircle.dev/validate-email-apis/leadx/contact-us/llms.txt): 33% complete

## LeadX's calls for this API (1)

- Docs on request from sales: [LeadX, contact us](https://datacircle.dev/validate-email-apis/leadx/contact-us/llms.txt)

## LeadX's APIs (7)

- [LeadX: company discovery API pricing, 1 plan](https://datacircle.dev/company-discovery-apis/leadx/contact-us/llms.txt)
- [LeadX: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/leadx/contact-us/llms.txt)
- [LeadX: phone finder API pricing, 1 plan](https://datacircle.dev/find-phone-apis/leadx/contact-us/llms.txt)
- [LeadX: Local business reviews API pricing, 1 plan](https://datacircle.dev/local-business-reviews-apis/leadx/contact-us/llms.txt)
- [LeadX: people search API pricing, 1 plan](https://datacircle.dev/people-search-apis/leadx/contact-us/llms.txt)
- [LeadX: email finder API pricing, 1 plan, Create a Bulk Email Enrichment Job](https://datacircle.dev/find-email-apis/leadx/contact-us-contact-sales-create-a-bulk-email-enrichment-job/llms.txt)
- [LeadX: email finder API pricing, 1 plan, Find Email](https://datacircle.dev/find-email-apis/leadx/contact-us-contact-sales-find-email/llms.txt)
- [LeadX: company enrichment API pricing, 1 plan, Fetch All Company Attributes](https://datacircle.dev/company-enrichment-apis/leadx/contact-us-contact-sales-fetch-all-company-attributes/llms.txt)
- [LeadX: company enrichment API pricing, 1 plan, Fetch Company Details](https://datacircle.dev/company-enrichment-apis/leadx/contact-us-contact-sales-fetch-company-details/llms.txt)

## LeadX: email verification API alternatives

- [Prime Verifier, contact us, Custom, over 2,000,000 credits, POST /v1/jobs](https://datacircle.dev/validate-email-apis/prime-verifier/contact-us-custom-over-2000000-credits-post-v1-jobs/llms.txt): 33% complete
- [Listclean, contact us, Custom volume, GET /verify/email/{email}](https://datacircle.dev/validate-email-apis/listclean/contact-us-custom-volume-get-verify-email-email/llms.txt): 33% complete, live
- [MailVeri, contact us, Enterprise, POST /verify-mails/](https://datacircle.dev/validate-email-apis/mailveri/contact-us-enterprise-post-verify-mails/llms.txt): 33% complete, live
- [MyEmailVerifier, contact us, Custom Quote, GET /verifier/validate_single/{email}/{API_KEY}](https://datacircle.dev/validate-email-apis/myemailverifier/contact-us-custom-quote-get-verifier-validate-single-email-api-key/llms.txt): 33% complete, live
- [Fuse AI, contact us](https://datacircle.dev/validate-email-apis/fuse-ai/contact-us/llms.txt): 33% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-06.

- https://docs.leadx.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.leadx.com/getting-started/rate-limiting?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.leadx.com/getting-started/results-and-billing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://docs.leadx.com/guides/find-and-verify-a-contact?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://leadx.com/api/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://leadx.com/email-mobile-enrichment?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://leadx.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://leadx.com/terms.html?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing