1 ROOT · D0 node

AP2 Mandate-Chain Validator art-01-ap2-mandate-chain-validator

ap2_mandate and execution_hash (H1) feed Stage 2 ACP checkout conformance

MCP Call · validate_ap2_mandate_chain

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "validate_ap2_mandate_chain",
    "arguments": {}
  },
  "id": 1
}

2 D2 node

ACP Checkout Conformance Validator art-12-acp-checkout-conformance-validator

acp_verdict and conformance_flags + execution_hash (H2) feed Stage 3 x402 settlement model

MCP Call · validate_acp_checkout

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "validate_acp_checkout",
    "arguments": {}
  },
  "id": 1
}

3 D3 node

x402_payload and settlement execution_hash (H3) feed Stage 4 cross-protocol validator

MCP Call · model_x402_settlement

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "model_x402_settlement",
    "arguments": {}
  },
  "id": 1
}

4 TERMINAL · D4 node

Exports unified AP2+ACP+TAP+x402 cross-protocol conformance mandate; execution_hash (H4) covers full transaction -- final stage

MCP Call · validate_agent_commerce_conformance

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "validate_agent_commerce_conformance",
    "arguments": {}
  },
  "id": 1
}