# TrustLookup, free: Email verification API

> Check an email address before it reaches your list. One call tells you whether the domain takes mail, whether the mailbox exists and whether it’s a throwaway inbox.

TrustLookup's Free plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. TrustLookup's docs list 2: Deliverability, Company.
We haven't run TrustLookup through [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt) yet.
This plan is free. We rank 4,391 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. [See the best free email verification API plan.](https://datacircle.dev/best-email-verification-api.txt)
[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. [StableEnrich's pay-as-you-go plan](https://datacircle.dev/validate-email-apis/stableenrich/pay-as-you-go-pay-per-request-with-x402-or-mpp-post-api-minerva-validate-emails/llms.txt) costs the least for 10,000 emails a month: $0.05.
[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), [Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt) and [looot](https://datacircle.dev/validate-email-apis/looot/top-up/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/trustlookup/free
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `GET https://api.trustlookup.io/v1/lookup`
- API key: with the plan, on https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://trustlookup.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#lookup
- Sold by: TrustLookup (https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 33%
- Deliverability: ✓
- Company: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Repeat free: never
- Also pays for: from the same budget: Phone validation · Carrier lookup · Number portability · HLR live status · IP intelligence · WHOIS and domain age

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Check an email address before it reaches your list. One call tells you whether the domain takes mail, whether the mailbox exists and whether it’s a throwaway inbox.

## Data

- Freshness: 24 hours
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- You get: 250 credits a month
- Enough for: 250 calls a month
- Expires: month

## Rate limit

- Per second: 5
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: q. Optional: checks, fresh
- Method: GET
- Path: /v1/lookup

## About the plan

- Plan: Free
- Who can get it: anyone

## The 13 fields the plan's answer can hold

syntax valid, domain, disposable, role, free provider, MX record, SMTP checked, deliverable, catch-all, summary, risk score, cached, checked at

## TrustLookup's plans (4)

- [TrustLookup, free](https://datacircle.dev/validate-email-apis/trustlookup/free/llms.txt): $0.00 per 1,000, 33% complete, 24 hours
- [TrustLookup, $19 monthly](https://datacircle.dev/validate-email-apis/trustlookup/19-monthly/llms.txt): $2.533 per 1,000, 33% complete, 24 hours
- [TrustLookup, $79 monthly](https://datacircle.dev/validate-email-apis/trustlookup/79-monthly/llms.txt): $2.257 per 1,000, 33% complete, 24 hours
- [TrustLookup, $249 monthly](https://datacircle.dev/validate-email-apis/trustlookup/249-monthly/llms.txt): $1.992 per 1,000, 33% complete, 24 hours

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

- `GET /v1/lookup`: [TrustLookup, free](https://datacircle.dev/validate-email-apis/trustlookup/free/llms.txt)

## TrustLookup's APIs (6)

- [TrustLookup: company enrichment API pricing, 4 plans](https://datacircle.dev/company-enrichment-apis/trustlookup/free/llms.txt)
- [TrustLookup: domain WHOIS API pricing, 4 plans](https://datacircle.dev/domain-whois-apis/trustlookup/free/llms.txt)
- [TrustLookup: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/trustlookup/free/llms.txt)
- [TrustLookup: IP company lookup API pricing, 4 plans](https://datacircle.dev/ip-company-lookup-apis/trustlookup/free/llms.txt)
- [TrustLookup: people enrichment API pricing, 4 plans](https://datacircle.dev/person-enrichment-apis/trustlookup/free/llms.txt)
- [TrustLookup: phone validation API pricing, 4 plans](https://datacircle.dev/validate-phone-apis/trustlookup/free/llms.txt)

## TrustLookup: email verification API alternatives

- [EmailVerify.io, $199 pack, Pay As You Go, 100,000 Credits, GET /validate](https://datacircle.dev/validate-email-apis/emailverify-io/199-pack-pay-as-you-go-100000-credits-get-validate/llms.txt): $1.99 per 1,000, 33% complete, live
- [EnrichmentAPI, $199 monthly](https://datacircle.dev/validate-email-apis/enrichmentapi/199-monthly/llms.txt): $1.99 per 1,000, 50% complete, live
- [MailRambo, $199 pack](https://datacircle.dev/validate-email-apis/mailrambo/199-pack/llms.txt): $1.99 per 1,000, 50% complete, live
- [SafetyMails, $1,555 yearly](https://datacircle.dev/validate-email-apis/safetymails/1555-yearly/llms.txt): $1.994 per 1,000, 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 2026-11-10.

- https://trustlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://trustlookup.io/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://trustlookup.io/email-validation-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://trustlookup.io/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://trustlookup.io/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing