Steam/PC Game Prices and Deals.
CheapShark API is a free Games & Comics API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
CheapShark is a price comparison site for PC games on Steam and other stores. Our public API lets developers use our pricing data on their own app or site.
Details from cheapshark.com.

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The CheapShark API is provided by CheapShark API (cheapshark.com). CheapShark is a price comparison site for PC games on Steam and other stores. Our public API lets developers use our pricing data on their own app or site.
Yes. The CheapShark 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 CheapShark API requires no authentication, so you can start making requests without signing up.
Yes. The CheapShark API supports CORS, so front-end JavaScript can call it directly.
Yes. The CheapShark API is served over HTTPS, so it's safe to use in production.