
IFTTT Connect API.
IFTTT API is a free Development API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Learn how to build an API to show and update connections, run actions, perform queries, and listen for triggers.
Details from platform.ifttt.com.

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The IFTTT API is provided by IFTTT (platform.ifttt.com). Learn how to build an API to show and update connections, run actions, perform queries, and listen for triggers.
Yes. The IFTTT API is listed in the Development 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 IFTTT API requires no authentication, so you can start making requests without signing up.
CORS support for the IFTTT API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The IFTTT API is served over HTTPS, so it's safe to use in production.