This API lets you access a vast archive of USA money-in-politics data. Use this create visualisations of how companies and politicians are linked, inform voters, or predict market movements. You can also use this API to get alerted when companies/sectors you are interested in are mentioned.
Free (donations encouraged)
This new product from Stripe lets you offer financial services to your customers. Loans, bank accounts, insurance, that sort of thing. Not really sure about use cases other than offering loans to customers, but this is well worth looking into if you're interested in finance.
Pricing is unknown as this is still in beta