
Quotes Trusted by many fortune brands around the world.
They Said So Quotes API is a free Personality API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Access over a million famous quotes via REST API. JSON/XML/JSONP formats, 500+ categories, Quote of the Day, bulk retrieval. From $4.99/month.
Details from theysaidso.com.

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The They Said So Quotes API is provided by They Said So (theysaidso.com). Access over a million famous quotes via REST API. JSON/XML/JSONP formats, 500+ categories, Quote of the Day, bulk retrieval. From $4.99/month.
Yes. The They Said So Quotes API is listed in the Personality 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 They Said So Quotes API requires no authentication, so you can start making requests without signing up.
CORS support for the They Said So Quotes API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The They Said So Quotes API is served over HTTPS, so it's safe to use in production.