
GW2Spidy API, Items data on the Guild Wars 2 Trade Market.
GW2Spidy API is a free Games & Comics API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
GW2Spidy - Guild Wars 2 Tradingpost Graphs.
Details from github.com.

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The GW2Spidy API is provided by rubensayshi (github.com). GW2Spidy - Guild Wars 2 Tradingpost Graphs.
Yes. The GW2Spidy 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 GW2Spidy API requires no authentication, so you can start making requests without signing up.
CORS support for the GW2Spidy API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The GW2Spidy API is served over HTTPS, so it's safe to use in production.