Advertising, subscription, AI-disclosure and accessibility rules across the US, EU and UK.
Tollmint API is a free Government API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from api.tollmint.com.

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The Tollmint API is provided by Tollmint API (api.tollmint.com).
Yes. The Tollmint API is listed in the Government 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 Tollmint API requires no authentication, so you can start making requests without signing up.
Yes. The Tollmint API supports CORS, so front-end JavaScript can call it directly.
Yes. The Tollmint API is served over HTTPS, so it's safe to use in production.