Add x402 MCP payment preparation#24
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Summary
Adds MCP transport handling to the existing x402 buyer helper so agents can parse an MCP
PaymentRequiredtool result and prepare the_meta["x402/payment"]payload for a retry.This keeps the payment flow deliberately narrow:
inspect-mcpparses rawPaymentRequired, JSON-RPCresult.structuredContent, or JSON text inresult.content[0].textwithout signing or spending.prepare-mcprequires--confirm, signs through the existing MetaMask CLI typed-data path, and prints the MCP retry metadata object.Closes #23.
Validation
PYTHONDONTWRITEBYTECODE=1 python3 -m py_compile skills/metamask-agent-wallet/scripts/x402_pay.pyPYTHONDONTWRITEBYTECODE=1 python3 skills/metamask-agent-wallet/scripts/x402_pay.py inspect-mcp <raw PaymentRequired JSON>PYTHONDONTWRITEBYTECODE=1 python3 skills/metamask-agent-wallet/scripts/x402_pay.py inspect-mcp <JSON-RPC structuredContent result>git diff --checkNo live payment was made during validation.