
Domain availability and registrar pricing across 52 TLDs.
DigMyName API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
No-auth JSON API for domain availability and registrar pricing. 60 req/60s per IP, no key.
Details from digmyname.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
DNS records, SPF/DMARC detection and TLS certificate expiry
Domain name search to find all domains containing particular words/phrases/etc
The DigMyName API is provided by DigMyName (digmyname.com). No-auth JSON API for domain availability and registrar pricing. 60 req/60s per IP, no key.
Yes. The DigMyName API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The DigMyName API requires no authentication, so you can start making requests without signing up.
Yes. The DigMyName API supports CORS, so front-end JavaScript can call it directly.
Yes. The DigMyName API is served over HTTPS, so it's safe to use in production.