btcnode.uk
Bitcoin blockchain data, fees, mempool, SEC insider trades, Reddit sentiment. x402 micropayments for paid endpoints.

Real-time cryptocurrency data, graphs and API that allows buy&sell.
BtcTurk API is a free Cryptocurrency API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from docs.btcturk.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.
Bitcoin blockchain data, fees, mempool, SEC insider trades, Reddit sentiment. x402 micropayments for paid endpoints.
The BtcTurk API is provided by BtcTurk (docs.btcturk.com).
Yes. The BtcTurk 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 BtcTurk API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The BtcTurk API supports CORS, so front-end JavaScript can call it directly.
Yes. The BtcTurk API is served over HTTPS, so it's safe to use in production.