# Coinslot, free: Email verification API

> Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening.

Coinslot's Free demo plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. Coinslot's docs list 2: Address, Deliverability.
Coinslot limits how many results you get but gives no number.
We ran Coinslot in [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt). We didn't score any Coinslot plan.
This plan is free. We rank 4,337 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/coinslot/free
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://coinslot.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://coinslot.dev/api/email-verify`
- API key: not needed
- Its API docs: https://coinslot.dev/api/email-verify?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: Coinslot (https://coinslot.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-09

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening.

## Data

- What it checks: format, mail servers, disposable domains
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0

## Rate limit

- Batch: 20

## Speed

- Answer: in the call

## The call

- You send: one of email or emails
- Method: POST
- Path: /api/email-verify

## About the plan

- Plan: Free demo
- Who can get it: anyone, no signup (inputs up to 2KB)

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

email, valid syntax, has MX, disposable, deliverable signal, MX records

## Coinslot's plans (4)

- [Coinslot, free](https://datacircle.dev/validate-email-apis/coinslot/free/llms.txt): $0.00 per 1,000, 33% complete
- [Coinslot, pay as you go](https://datacircle.dev/validate-email-apis/coinslot/pay-as-you-go/llms.txt): $0.15 per 1,000, 33% complete
- [Coinslot, $5 pack](https://datacircle.dev/validate-email-apis/coinslot/5-pack/llms.txt): $0.15 per 1,000, 33% complete
- [Coinslot, $20 pack](https://datacircle.dev/validate-email-apis/coinslot/20-pack/llms.txt): $0.15 per 1,000, 33% complete

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

- `POST /api/email-verify`: [Coinslot, free](https://datacircle.dev/validate-email-apis/coinslot/free/llms.txt)

## Coinslot's APIs (2)

- [Coinslot: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/coinslot/free/llms.txt)
- [Coinslot: web scraping API pricing, 4 plans](https://datacircle.dev/web-scraping-apis/coinslot/free/llms.txt)

## Coinslot: email verification API alternatives

- [1xAPI, $14.99 monthly](https://datacircle.dev/validate-email-apis/1xapi/14-99-monthly/llms.txt): $0.15 per 1,000, 33% complete, live
- [SMTPing, $150 pack, 1M credits, POST /verify/bulk](https://datacircle.dev/validate-email-apis/smtping/150-pack-1m-credits-post-verify-bulk/llms.txt): $0.15 per 1,000, 50% complete, live
- [ValidEmail.net, $6,000 pack](https://datacircle.dev/validate-email-apis/validemail-net/6000-pack/llms.txt): $0.15 per 1,000, 67% complete, live
- [No2Bounce, $18,006 yearly](https://datacircle.dev/validate-email-apis/no2bounce/18006-yearly/llms.txt): $0.15 per 1,000, 0% 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 2026-11-09.

- https://coinslot.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://coinslot.dev/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://coinslot.dev/api/index.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://coinslot.dev/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://coinslot.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing