
Crypto futures prices, candles, funding, open interest, long/short and liquidations, 9 exchanges.
MarginPad 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.
Live prices, candles, a scored screener, funding, open interest, liquidations, an economic calendar and a free paper-trading API. Keyless. CORS. 60 req/min. OpenAPI 3.1.
Details from marginpad.io.

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The MarginPad API is provided by MarginPad (marginpad.io). Live prices, candles, a scored screener, funding, open interest, liquidations, an economic calendar and a free paper-trading API. Keyless. CORS. 60 req/min. OpenAPI 3.1.
Yes. The MarginPad 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 MarginPad API requires no authentication, so you can start making requests without signing up.
Yes. The MarginPad API supports CORS, so front-end JavaScript can call it directly.
Yes. The MarginPad API is served over HTTPS, so it's safe to use in production.