Estimates a gender from a first name.
Genderize.io 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.
Check if a name is male or female. Accurate name-to-gender checking using our API, spreadsheet tool or no-code integrations.
Details from genderize.io.

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Yes. The Genderize.io 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 Genderize.io API requires no authentication, so you can start making requests without signing up.
Yes. The Genderize.io API supports CORS, so front-end JavaScript can call it directly.
Yes. The Genderize.io API is served over HTTPS, so it's safe to use in production.