The Bitfinex Go SDK by Bitfinex allows to access the API to integrate financial features associated with bitcoin and crypto-currencies. Official implementation, REST API, and WebSockets API available. It includes installation and usage.
TrueLayer has introduced a PSD2-compliant Payments API. The API enables transfer of funds directly from bank account to bank account. It uses active authentication for the highest possible security, and transferred funds are received instantly. The API is currently in beta testing.
PotCoin first introduced its blockchain-based cryptocurrency to help streamline access to participation in the quickly legalizing marijuana industry. To help developers aid in that process, PotCoin offered limited access to its Payment API. Now, the company has released full access to the API.
When Microsoft launched their much-touted new search engine Bing last week it generated a lots of press and despite a somewhat muted expectations, it turned-out to be something of a hit. But lost in all the broader buzz about Bing was some news for developers: Bing has an API (we've now added a new Bing API Profile with technical details).