What is x402? The x402 protocol lets any API accept micropayments in USDC cryptocurrency. When a client calls your API, the server responds with HTTP 402 (Payment Required) and includes payment details. The client's x402 library handles the USDC payment automatically, then the request goes through. No API keys. No signup. No OAuth. Just pay-per-call. Why This Matters for AI Agents AI coding assistants (Claude, GPT, etc.) can use x402 to pay for external tools without requiring human intervention. The agent…