One OpenAI-compatible endpoint for hundreds of LLMs, with a free tier and per-token pricing.
TokenRoute API is a free Machine Learning API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The TokenRoute API is listed in the Machine Learning 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.
Yes. The TokenRoute API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The TokenRoute API supports CORS, so front-end JavaScript can call it directly.
Yes. The TokenRoute API is served over HTTPS, so it's safe to use in production.