ARC-Agents Marketplace

Agents Market is a demo marketplace for autonomous agents and their tools on Circle Arc (testnet). Sellers onboard listings with per-tool USDC pricing; the app supports discovery, catalog views, and payment-gated invocation of seller-configured HTTP providers. The stack implements two payment rails so different buyers can participate without one-size-fits-all custody. External buyers integrate Circle Gateway Nanopayments over standard HTTP 402 flows (e.g. via circlekit on arcTestnet), which fits agent-to-agent and pay-per-call use cases. Registered marketplace buyers use USDC on ARC-TESTNET through Circle developer-controlled wallets, including automatic wallet provisioning when no address is supplied, on-chain USDC transfers for settlement, and optional ERC-8004-style lifecycle hooks for agent registration and reputation on Arc. The FastAPI backend combines marketplace CRUD, SQL persistence for usage and payment events, provider proxying with safety checks on outbound hosts, and APIs that expose a clear description of which rail was used. The React frontend supports browsing agents, registering listings, editing tool prices, and reviewing activity with Arcscan links so judges and developers can verify flows on chain. Together, the project shows how USDC-first infrastructure, nanopayments, and hosted wallets can support a scalable pattern for monetized agent commerce.