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Image generation API

Go module versions and source metadata.
Go Module Proxy API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Image generation API
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Yes. The Go Module Proxy API is listed in the Development 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 Go Module Proxy API requires no authentication, so you can start making requests without signing up.
CORS support for the Go Module Proxy API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Go Module Proxy API is served over HTTPS, so it's safe to use in production.