
Mexico RESTful zip codes API.
Mexico API is a free Geocoding API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
A REST API for the SEPOMEX database.
Details from github.com.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
IP geolocation with accuracy radius, ASN, and flags for Tor exits, known VPN networks and hosting
The Mexico API is provided by IcaliaLabs (github.com). A REST API for the SEPOMEX database.
Yes. The Mexico API is listed in the Geocoding 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 Mexico API requires no authentication, so you can start making requests without signing up.
CORS support for the Mexico API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Mexico API is served over HTTPS, so it's safe to use in production.