Hirak Exchange Rates
Exchange rates between 162 currency & 300 crypto currency update each 5 min, accurate, no limits

Free A+–F token-safety grades across Solana and EVM chains.
HostDeFi API is a free Cryptocurrency API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
POST a token address, get a graded verdict plus the pre-graduation signals other risk APIs are blind to. Free keyless tier; SOL-native paid keys.
Details from hostdefi.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.
Exchange rates between 162 currency & 300 crypto currency update each 5 min, accurate, no limits
The HostDeFi API is provided by HostDeFi (hostdefi.com). POST a token address, get a graded verdict plus the pre-graduation signals other risk APIs are blind to. Free keyless tier; SOL-native paid keys.
Yes. The HostDeFi 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 HostDeFi API requires no authentication, so you can start making requests without signing up.
Yes. The HostDeFi API supports CORS, so front-end JavaScript can call it directly.
Yes. The HostDeFi API is served over HTTPS, so it's safe to use in production.