# SignupScore, free: Email verification API

> Check an email or domain for disposable providers, missing mail servers, role accounts, typos, and suspicious patterns.

SignupScore's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 2 of the 6 key fields we check: Address, Deliverability.
In [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt), the best plan from SignupScore scores 0.0 out of 100. SignupScore ranks 171st of 181 providers.
This plan is free. We rank 3,753 plans for email verification APIs by price. Half the plans cost $1.98 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.
[MailTester Ninja](https://datacircle.dev/validate-email-apis/mailtester-ninja/23-99-monthly/llms.txt), [Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/499-monthly/llms.txt) and [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/signupscore/free
- [Email validation API: 180+ verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://signupscore.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://signupscore.com/api/v1/check`
- API key: with the plan, on https://signupscore.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Its API docs: https://signupscore.com/docs/api/check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Sold by: SignupScore (https://signupscore.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-05

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## 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 or domain for disposable providers, missing mail servers, role accounts, typos, and suspicious patterns.

## Data

- Freshness: stored
- What it checks: format, mail servers, disposable domains, role addresses
- Keep data: no limit
- Use data: Use our API and web interface to protect your own signups. Do not use for illegal activities or spam. We may restrict excessive automated usage. [...] You may use our service for personal and commercial purposes. Do not copy or redistribute our detection algorithms.

## Plan

- Pay: $0
- You get: 250 credits a month
- Enough for: 250 calls a month
- Expires: at the monthly reset

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: input. Optional: check_mx
- Method: POST
- Path: /api/v1/check

## About the plan

- Plan: Free
- Who can get it: anyone 13 or older, one free account per person or organization

## The 15 fields the plan's answer can hold

request ID, action, primary reason, disposable, public provider, role-based, suspicious, privacy relay, dynamic DNS, MX record, suggested domain, normalized email, mailbox alias, SPF record, DMARC record

## SignupScore's plans (5)

- [SignupScore, free](https://datacircle.dev/validate-email-apis/signupscore/free/llms.txt): $0.00 per 1,000, 33% complete, stored
- [SignupScore, $12 monthly](https://datacircle.dev/validate-email-apis/signupscore/12-monthly/llms.txt): $0.48 per 1,000, 33% complete, stored
- [SignupScore, $49 monthly](https://datacircle.dev/validate-email-apis/signupscore/49-monthly/llms.txt): $0.245 per 1,000, 33% complete, stored
- [SignupScore, $99 monthly](https://datacircle.dev/validate-email-apis/signupscore/99-monthly/llms.txt): $0.198 per 1,000, 33% complete, stored
- [SignupScore, $299 monthly](https://datacircle.dev/validate-email-apis/signupscore/299-monthly/llms.txt): $0.199 per 1,000, 33% complete, stored

## SignupScore's calls (1)

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

## SignupScore's APIs (1)

- [SignupScore: email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/signupscore/free/llms.txt)

## SignupScore: email verification API alternatives

- [Check Mail, $99 monthly](https://datacircle.dev/validate-email-apis/check-mail/99-monthly/llms.txt): $0.198 per 1,000, 50% complete, stored
- [Elastic Email, $999 monthly, Email API Pro (5,000,000 emails/month), POST /verifications/files](https://datacircle.dev/validate-email-apis/elastic-email/999-monthly-email-api-pro-5000000-emails-month-post-verifications-files/llms.txt): $0.20 per 1,000, 50% complete, stored
- [Signaliz, top-up](https://datacircle.dev/validate-email-apis/signaliz/top-up/llms.txt): $0.20 per 1,000, 33% complete, stored
- [StopReg, $100 monthly](https://datacircle.dev/validate-email-apis/stopreg/100-monthly/llms.txt): $0.20 per 1,000, 50% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-05.

- https://signupscore.com/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://signupscore.com/docs/api/check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://signupscore.com/docs/api/errors?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://signupscore.com/docs/api/signals?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://signupscore.com/docs/credits-and-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://signupscore.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://signupscore.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing