Foresight News reports that Coinbase's developer platform has launched the fiat on-ramp application programming interface (Onramp API), with its first partner being Moonshot, which is now live. The Onramp API allows for customizable user experiences, quick integration, supports Apple Pay, and guest checkout. Additionally, this feature is currently limited to the United States, where users must have a U.S. phone number and pay in U.S. dollars.