What it does: An AI agent (built on Strands Agents + Coinbase AgentKit) that can autonomously pay for data using x402 micropayments. Specifically, it queries a protected API endpoint for ETH market price data (sourced from CoinGecko), and when it hits that endpoint, it automatically pays via a CDP-managed wallet on Base Sepolia (a testnet) using USDC.
Architecture: User → AI agent (LLM) → calls get_market_price() → checks a spending policy → executes an x402 payment via AgentKit → CDP EVM wallet signs and sends testnet USDC → a FastAPI "seller" server returns the CoinGecko price data. The server returns an HTTP 402 ("Payment Required") until a valid x402 payment is attached.
Wallet model: Uses Coinbase's CDP-managed wallets rather than raw private keys — the app never handles or stores private keys directly, since AgentKit's x402 provider draws the signer from the wallet provider.
