Coinbase has launched x402 Bazaar, a catalog for USDC micropayments integrated with API services. The system serves as a discovery layer for artificial intelligence agents and developers, enabling instant settlements. The project revives the old HTTP 402 status code, “Payment Required,” and applies it to API calls. The client sends a request accompanied by a signed payment payload in USDC, which is verified and settled by Coinbase’s hosted facilitator. The company does not charge additional fees for USDC transactions processed through the Base network. Initial support covers USDC on the Base mainnet and Sepolia Base, with expansion planned. The catalog returns structured JSON data, specifying the accepted asset, network, destination address, and maximum payment limits. Coinbase’s Flashblocks feature reduces perceived latency, delivering pre-confirmations in 200 ms. With the demand for dollar-backed stablecoins on the rise, x402 Bazaar is a strategic tool for bridging human consumption and machine interactions, creating a more efficient and scalable micropayments ecosystem.