I built an MCP server that charges AI agents per call using x402 micropayments
A developer has created a system that charges AI agents for API calls using the revived HTTP 402 "Payment Required" status code, enabling machine-to-machine payments without human intervention. This approach bypasses traditional SaaS subscriptions and payment processors like Stripe, instead leveraging EIP-3009 for atomic USDC transfers on the Base mainnet. The architecture uses a Cloudflare Worker as a paywall proxy, which intercepts requests, prompts the agent for payment if necessary, and verifies on-chain transactions before forwarding to the upstream MCP server. This allows for granular, per-tool pricing, reflecting the actual compute cost of each request. AI
IMPACT Enables automated, per-use payment for AI agents, potentially reducing costs and improving resource allocation.