Worth the Rip
Sealed trading-card product prices and expected value across 10 TCGs, refreshed every 2 hours
Retrieve xkcd comics as JSON.
xkcd API is a free Games & Comics API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.

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Sealed trading-card product prices and expected value across 10 TCGs, refreshed every 2 hours
Official API proxy with better data structure and more features
Yes. The xkcd API is listed in the Games & Comics 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 xkcd API requires no authentication, so you can start making requests without signing up.
Not directly. The xkcd API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The xkcd API is served over HTTPS, so it's safe to use in production.