来源: a2a-registry/browse Agent Card: https://onyx-actions.onrender.com A2A: https://onyx-actions.onrender.com The independent trust & verification layer for the agentic web. Signed PROCEED/REVIEW/HOLD pre-payment clearance + Ed25519-signed merchant, price, contract and agent verification an agent checks before it transacts. Neutral, conflict-free; facts not judgments. x402/A2A/AP2/MCP/ERC-8004.