AI TRENDS | Circle Launches Discovery API for x402-Compatible USDC Payment Services

Circle has launched Discovery API, a public endpoint that lets users retrieve all x402-compatible services supporting USDC cross-chain payments, including market data, web search, and prediction markets. According to Foresight News, the API can be called without an API key or account. The query results are returned in structured JSON and include payment details such as the payment network, token address, amount, and service description. The company said AI agents can verify and call services automatically without reading documentation, and payments can be completed through on-chain x402 transfers or Circle Gateway for gas-free small-value settlement.