AI Agent Built to Shop, Audit, and Pay in USDC Without Human Approval

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A developer built a fully autonomous AI procurement agent for Google's All Things Agentic Hackathon that can compare prices across data providers, review its own spending decisions, and execute real USDC payments on-chain. The system uses two AI models — a primary decision-making agent and a separate auditor — but relies on a deterministic budget guard that checks confirmed on-chain spend from the past 24 hours to enforce a hard spending cap. After each payment, the agent independently verifies the transaction by reading the blockchain's Transfer event directly, rather than trusting the payment SDK's reported hash. Payments are executed using the x402 HTTP payment protocol with EIP-3009 signed authorizations, requiring manual reconstruction of low-level cryptographic payload details not exposed by standard libraries. Because the only real x402 provider tested required Base mainnet USDC, the team built their own testnet-compatible provider to validate the full payment loop without spending real funds.

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