https://github.com/google-agentic-commerce/a2a-x402

The A2A x402 Extension brings cryptocurrency payments to the Agent-to-Agent (A2A) protocol, enabling agents to monetize their services through on-chain payments. This extension revives the spirit of HTTP 402 "Payment Required" for the decentralized agent ecosystem.

a2a a2a-protocol agentic-ai agents gen-ai generative-ai mcp

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