Free Email APIs with no API key

13 Email APIs that need no API key, account or credit card. 9 of them also allow CORS, so you can call them straight from browser JavaScript. Listed by uptime and ease of use.

1
Kickbox API
Online · 1026 ms
Email verification API. A free email API by Powered by Kickbox.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
2
mail.gw API
Online · 546 ms
API for creating temporary email accounts.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
3
mail.tm API
Online · 454 ms
Temporary Email Service. A free email API by Mail.tm.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
4
MailSenpai DNS Check API
Online · 805 ms
Check a domain's SPF, DKIM, DMARC and MX records and get what to fix, with the values to publish.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
5E
Email Validator by LifeStep API
Online · 1178 ms
Validate email syntax and MX, detect disposable/role addresses, suggest typo fixes.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
6
Disify API
Online · 1344 ms
Validate and detect disposable and temporary email addresses.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
7
DropMail API
Online · 565 ms
GraphQL API for creating and managing ephemeral e-mail inboxes.
- No API key needed
- HTTPS
No authHTTPSCORS ?
8
Guerrilla Mail API
Online · 533 ms
Disposable temporary Email addresses. A free email API by Guerrilla Mail API.
- No API key needed
- HTTPS
No authHTTPSCORS ?
9
Best Temp Mail API
Online · 598 ms
Disposable inboxes for automated email testing, with OTP extraction.
- No API key needed
- HTTPS
No authHTTPSNo CORS
10
MailCheck.ai API
Online · 2357 ms
Prevent users to sign up with temporary email addresses.
- No API key needed
- HTTPS
No authHTTPSCORS ?
11A
AGPC Domain Check API
Last check failed
Check a domain's SPF, DKIM, DMARC and MX with a graded shareable report.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
12
Email Spam Tester API
Last check failed
Send a test message and get a spam score, 41 checks with RFC citations and a fix plan.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS
13E
EVA API
Last check failed
Validate email addresses. A free email API by eva.pingutil.com.
- No API key needed
- Callable from the browser (CORS)
- HTTPS
No authHTTPSCORS

Keyless Email APIs compared

Email APIs with no API key
API	API key	HTTPS	CORS	Uptime	Response	Rating
Kickbox	No	Yes	Yes	Up	1026 ms	Not rated
mail.gw	No	Yes	Yes	Up	546 ms	Not rated
mail.tm	No	Yes	Yes	Up	454 ms	Not rated
MailSenpai DNS Check	No	Yes	Yes	Up	805 ms	Not rated
Email Validator by LifeStep	No	Yes	Yes	Up	1178 ms	Not rated
Disify	No	Yes	Yes	Up	1344 ms	Not rated
DropMail	No	Yes	Unknown	Up	565 ms	Not rated
Guerrilla Mail	No	Yes	Unknown	Up	533 ms	Not rated
Best Temp Mail	No	Yes	No	Up	598 ms	Not rated
MailCheck.ai	No	Yes	Unknown	Up	2357 ms	Not rated
AGPC Domain Check	No	Yes	Yes	Down	–	Not rated
Email Spam Tester	No	Yes	Yes	Down	–	Not rated
EVA	No	Yes	Yes	Down	–	Not rated

FAQ

Are there free Email APIs without an API key?

Yes. 13 free Email APIs need no API key or sign-up, including Kickbox API, mail.gw API and mail.tm API. You can send a request straight away.

Which keyless Email APIs can I call from JavaScript in the browser?

9 of them also support CORS, including Kickbox API, mail.gw API and mail.tm API, so a plain fetch from a web page works.

Do APIs without a key have limits?

Usually, yes. Keyless APIs typically rate-limit by IP address, so cache responses and avoid tight loops. For production traffic, an API with a free key tier often gives higher, more predictable limits.