All Citigroup account and statement data APIs.
Citi API is a free Finance API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Find out how Citi Partners can use the Partner Portal to establish new revenue channels, provide value to customers, and increase profitability.
Details from sandbox.developerhub.citi.com.

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The Citi API is provided by Citi Partner Portal (sandbox.developerhub.citi.com). Find out how Citi Partners can use the Partner Portal to establish new revenue channels, provide value to customers, and increase profitability.
Yes. The Citi API is listed in the Finance 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 Citi API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Citi API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Citi API is served over HTTPS, so it's safe to use in production.