Finance — entry 010 of 47
Citi
Citi's developer program — now consolidated at developer.citi.com after the old sandbox.developerhub.citi.com domain was retired and now redirects to a separate Citi Partner Portal — exposes Citi Treasury and Trade Solutions APIs for account balances/statements, real-time and cross-border payments, and payment acceptance, authenticated via OAuth 2.0 client credentials bound to a mutual-TLS (mTLS) client certificate and returning JSON. Anyone can explore the free, self-contained API Explorer sandbox and Postman collections without a banking relationship, but reaching production requires an explicit "scope and approvals" step plus uploading a certificate — i.e. an approved Citi business relationship, not open self-serve signup, so pricing is negotiated rather than published. This sandbox couldn't complete a meaningful unauthenticated CORS probe against a production endpoint (Citi's OAuth/mTLS-gated APIs expose no anonymous GET/OPTIONS surface to test), so `cors` is left `unknown`.
GreatAPIs Score
Embed this badge
<a href="https://greatapis.com/api/citi/"><img src="https://greatapis.com/badge/citi.svg" alt="Scored 60 on greatapis.com"></a>Auth quickstart
- Register an app / run the OAuth flow to obtain a bearer token.
- Send it as an Authorization header
Authorization: Bearer <token>
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.