# SentriSend, free: Email verification API

> Use the API from your server to check an address before signup or send a message through the gateway

SentriSend's Free Sandbox plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. SentriSend's docs list 1: Deliverability.
We ran SentriSend in [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt). We didn't score any SentriSend plan.
This plan is free. We rank 4,767 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. [728 email verification API plans on our price sheet are free.](https://datacircle.dev/best-email-verification-api.txt) [pingutil's free plan](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt) scores highest of the free plans in our benchmark, at 82.3 out of 100.
[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, and costs less up front than treg's top-up from $10.
[Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt), [pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/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/sentrisend/free
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://sentrisend.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://sentrisend.com/api/v1/validate`
- API key: with the plan, on https://sentrisend.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://sentrisend.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: SentriSend (https://sentrisend.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-11

## In the answer

- Completeness: 17%
- Deliverability: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: POST /api/v1/send

## Overage

- Units cap: hard

## Not found

- $ per 1,000 calls that find nothing: $0.00

## Catch-all

- $ per 1,000 emails at catch-all domains: $0.00

## In their words

- Their pitch: Use the API from your server to check an address before signup or send a message through the gateway

## Data

- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: Use SentriSend only for lawful communications and only where you have the permissions and legal basis required to contact the recipients. [...] The service is for business, trade or professional use

## Plan

- Pay: $0
- You get: 100 requests a month
- Enough for: 100 calls a month
- Expires: unused requests do not carry over

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /api/v1/validate

## About the plan

- Plan: Free Sandbox
- Who can get it: anyone acting for business, trade or professional purposes, not as a consumer, one free key per normalized email identity, its signup email verified

## The 6 fields the plan's answer can hold

allowed, disposable, reason, risk score, suggested domain, advisories

## SentriSend's plans (4)

- [SentriSend, free](https://datacircle.dev/validate-email-apis/sentrisend/free/llms.txt): $0.00 per 1,000, 17% complete
- [SentriSend, $29 monthly](https://datacircle.dev/validate-email-apis/sentrisend/29-monthly/llms.txt): $0.58 per 1,000, 17% complete
- [SentriSend, $299 monthly](https://datacircle.dev/validate-email-apis/sentrisend/299-monthly/llms.txt): 17% complete
- [SentriSend, $2,490 yearly](https://datacircle.dev/validate-email-apis/sentrisend/2490-yearly/llms.txt): 17% complete

## SentriSend's calls (1)

- `POST /api/v1/validate`: [SentriSend, free](https://datacircle.dev/validate-email-apis/sentrisend/free/llms.txt)

## SentriSend's APIs (1)

- [SentriSend Email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/sentrisend/free/llms.txt)

## SentriSend: email verification API alternatives

[SentriSend alternatives: other email verification API providers by price](https://datacircle.dev/sentrisend-alternatives.txt)

We list SentriSend's cheapest paid plan first. Next we list other providers' plans closest to SentriSend in price per 1,000 emails.

- [SentriSend, $29 monthly](https://datacircle.dev/validate-email-apis/sentrisend/29-monthly/llms.txt): $0.58 per 1,000, 17% complete
- [Bounceless, $579 pack, 1,000,000 credit pack, POST /v1/requests, Create a batch (listId)](https://datacircle.dev/validate-email-apis/bounceless/579-pack-1000000-credit-pack-post-v1-requests-create-a-batch-listid/llms.txt): $0.579 per 1,000, 50% complete, live
- [NexMailPro, $29 monthly, Pro, POST /verify/email](https://datacircle.dev/validate-email-apis/nexmailpro/29-monthly-pro-post-verify-email/llms.txt): $0.58 per 1,000, 50% complete, stored
- [Valid Email Checker, $590 monthly, 1,015,000 credits a month, POST /verify-bulk](https://datacircle.dev/validate-email-apis/valid-email-checker/590-monthly-1015000-credits-a-month-post-verify-bulk/llms.txt): $0.581 per 1,000, 67% complete, live
- [Dev.me, $35 monthly](https://datacircle.dev/validate-email-apis/dev-me/35-monthly/llms.txt): $0.583 per 1,000, 83% complete

## Sources

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

- https://sentrisend.com/acceptable-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://sentrisend.com/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://sentrisend.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://sentrisend.com/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://sentrisend.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing