{"protocol":"A2A 0.3","jsonrpc":"POST https://agentsvc.io/a2a","http_json":"POST https://agentsvc.io/a2a/v1/message:send","agent_card":"https://agentsvc.io/.well-known/agent-card.json","payment_extension":"https://github.com/google-agentic-commerce/a2a-x402/blob/main/spec/v0.1"}