AgentPay Gate v4.0 — Canonical x402 v2 Payment Header & Official MCP Server Verifier

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Description

End-to-end compliance verifier for AI agent monetization: validates HTTP 402 PAYMENT-REQUIRED headers (x402Version 2), CAIP-2 eip155:8453 Base USDC payloads, Official MCP Streamable HTTP tools/list schemas, and A2A v0.3.0 agent-card.json manifests.