Developer Builds AI Agent That Accepts USDC Micropayments via HTTP 402 Protocol
A developer has shared a technical walkthrough detailing how to build an autonomous AI agent that charges callers small USDC micropayments before returning data, using the x402 HTTP Payment Required extension on the Base blockchain. The agent exposes a simple HTTP endpoint — in this case an ETH/USDC price aggregator — and requires a signed USDC transfer from the caller before fulfilling each request. The setup runs on lightweight infrastructure such as Cloudflare Workers or a basic Flask app on a low-cost VPS, keeping operating costs minimal. Earnings per call are fractions of a cent, and the author cautions that the system demands constant uptime, payment failure handling, and secure key management. The post is framed as a practical experiment for developers rather than a reliable passive income strategy.
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