For Developers & Automation Experts

Email Verification APIs That Just Work

Truelist offers REST and GraphQL APIs with sub-second response times, comprehensive docs, and consistent JSON responses. Real-time single validation or async bulk processing — you choose.

api REST and GraphQL APIs.: Choose the API that fits your stack. Full documentation, predictable responses, and clear error handling.
neurology Enhanced accuracy.: Multi-source verification catches invalid emails on catch-all domains that standard SMTP checks miss. Up to 2x more accurate.
bolt Real-time and batch.: Validate single addresses in real time or process bulk lists asynchronously. Same API, same pricing.

Start your free trial

No credit card required

Full name

Work email

Company

Real-time validation Powered by Truelist

You've dealt with this before

code_off Inconsistent API responses: Different verification tools return different result formats, making it hard to build reliable validation logic. You need consistent, predictable responses.
help Catch-all domains return useless results: Most APIs just return "unknown" for catch-all domains and leave you to figure it out. That's not verification — that's a guess.
block Rate limits slow you down: Strict rate limits on cheap plans force you to throttle requests or upgrade to expensive tiers.
description Poor documentation wastes your time: Incomplete docs, inconsistent response formats, and missing edge case handling cost you hours in debugging.

Built for developers who ship

Simple to integrate, predictable to scale

Truelist's API is designed to be simple to integrate, predictable to use, and affordable to scale.

neurology

Built-in accuracy

Multi-source verification goes beyond SMTP checks. Get definitive answers on catch-all domains instead of "unknown."

code

Clean API design

RESTful endpoints with consistent JSON responses. GraphQL for flexible queries. Comprehensive docs with code examples.

bolt

Real-time validation

Sub-second response times for single email validation. Integrate into signup forms, CRM workflows, or any real-time pipeline.

Use cases

How developers use Truelist

app_registration Signup form validation: Validate email addresses at the point of entry. Block disposable, invalid, and risky emails before they hit your database.
database CRM data quality: Run nightly batch jobs to verify contact lists in Salesforce, HubSpot, or your custom CRM. Keep your data clean automatically.
webhook Automation workflows: Connect Truelist to Zapier or build custom integrations. Verify emails as they flow through your pipeline.
person_add SaaS onboarding: Verify user emails during registration to reduce fake signups and improve activation rates.

Start building with Truelist

Get your API key in under 2 minutes. 100 free validations + 10 enhanced credits to test.

No credit card required.

Get your API key arrow_forward Read the docs

Frequently Asked Questions

Can't find the answer you're looking for? Check our API docs or reach out to our support team.

What API formats do you support?: REST and GraphQL. Both return JSON responses with consistent result codes and detailed validation metadata.
Is there a sandbox or test mode?: Yes. The free plan gives you 100 validations to test the API before committing to a paid plan.
What's the response time for real-time validation?: Typically under 1 second for single email validation. Batch processing times depend on list size.
Do you have SDKs or client libraries?: We provide code examples in multiple languages. The REST API works with any HTTP client.
How does pricing work for API usage?: Plans are based on monthly validation volume. Check the pricing page for current plan details.