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AnswerLine API is a free Machine Learning API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Guides for the API: quickstart, authentication and errors, rate limits, balance and pricing, async tasks, webhooks, MCP and integrations.
Details from answerline.dev.

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The AnswerLine API is provided by AnswerLine (answerline.dev). Guides for the API: quickstart, authentication and errors, rate limits, balance and pricing, async tasks, webhooks, MCP and integrations.
Yes. The AnswerLine 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 AnswerLine API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the AnswerLine API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The AnswerLine API is served over HTTPS, so it's safe to use in production.