Walltime
To retrieve Walltime's market info
Provide simple and reliable API access to Ethereum blockchain.
Watchdata API is a free Blockchain API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Welcome to WatchData Documentation – Your infrastructure for building blockchain apps.
Details from docs.watchdata.io.

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.
To retrieve Walltime's market info
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The Watchdata API is provided by WatchData Documentation (docs.watchdata.io). Welcome to WatchData Documentation – Your infrastructure for building blockchain apps.
Yes. The Watchdata API is listed in the Blockchain 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 Watchdata API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Watchdata API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Watchdata API is served over HTTPS, so it's safe to use in production.