Registered Domain Names Search.
Domainsdb.info API is a free Business API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
Access our comprehensive domain database through a powerful API.
Details from domainsdb.info.

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The Domainsdb.info API is provided by DomainsDB API (domainsdb.info). Access our comprehensive domain database through a powerful API.
Yes. The Domainsdb.info API is listed in the Business 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 Domainsdb.info API requires no authentication, so you can start making requests without signing up.
Not directly. The Domainsdb.info API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Domainsdb.info API is served over HTTPS, so it's safe to use in production.