Cryptocurrency info, place order.
Mexc API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Details from mexc.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.
Reorg-aware Monero (XMR) network metrics, mining-pool centralization and chain reorganizations
The Mexc API is provided by MEXC API (mexc.com).
Yes. The Mexc API is listed in the Cryptocurrency 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.
Yes. The Mexc API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Mexc API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Mexc API is served over HTTPS, so it's safe to use in production.