Implement x402 protocol for crypto payments and update documentation#367
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Implement x402 protocol for crypto payments and update documentation#367
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Implement the x402 HTTP payment protocol so external clients (AI agents, apps) can pay per-request with USDC stablecoins instead of needing a Mu account. Set X402_PAY_TO to a wallet address to enable. Flow: client sends request → server returns 402 with payment requirements → client pays on-chain → retries with X-PAYMENT header → server verifies and settles via facilitator → serves the response. - wallet/x402.go: protocol implementation (requirements, verify, settle) - main.go: x402 auth bypass and quota check integration - internal/api/mcp.go: 402 response with payment requirements on quota failure - docs/ENVIRONMENT_VARIABLES.md: x402 configuration docs https://claude.ai/code/session_016UhaM3HefwZjArvB7hHbpE
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