What APIs are essential when building a crypto payment gateway?

When building a crypto payment gateway, APIs are the backbone of the entire system. The most essential one is the Blockchain API, which allows the gateway to send, receive, and verify transactions on networks like Bitcoin, Ethereum, or Solana. Wallet APIs help generate wallet addresses and securely manage digital assets. Price Oracle APIs provide real-time cryptocurrency exchange rates so merchants can display accurate payment amounts. Webhook APIs instantly notify your system when a payment is confirmed, eliminating the need for constant status checks. If your business operates in regulated markets, KYC/AML APIs are important for identity verification and compliance. Finally, Merchant and Payment APIs enable payment requests, transaction tracking, refunds, and seamless integration with websites or mobile applications. Together, these APIs ensure the payment gateway is secure, scalable, and capable of delivering a smooth payment experience for both businesses and customers.