Nordigen
Connect to bank accounts using official bank APIs and get raw transaction data
Equity, index, futures, options symbology from Bloomberg LP.
OpenFIGI API is a free Finance API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from openfigi.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Connect to bank accounts using official bank APIs and get raw transaction data
Approval layer for AI agent payments: per-agent budgets, rules, single-use credentials, sandbox
Point-in-time quarterly revenue for 20 U.S. issuers
The OpenFIGI API is provided by OpenFIGI (openfigi.com).
Yes. The OpenFIGI 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 OpenFIGI API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The OpenFIGI API supports CORS, so front-end JavaScript can call it directly.
Yes. The OpenFIGI API is served over HTTPS, so it's safe to use in production.