Provides various endpoints to interact with the Solana Blockchain.
Solana JSON RPC API is a free Cryptocurrency API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Bitcoin solo mining pool stats, per-address miner stats and an open dataset of solo-mined blocks
Yes. The Solana JSON RPC 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.
No. The Solana JSON RPC API requires no authentication, so you can start making requests without signing up.
CORS support for the Solana JSON RPC API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Solana JSON RPC API is served over HTTPS, so it's safe to use in production.