1 ROOT · D0 catalog

Agentic Checkout Protocol Selector 495-agentic-checkout-protocol-selector

protocol_rank (UCP/ACP/x402/Visa TAP), merchant_risk_profile feed Stage 2 conformance and fraud checks

MCP Call · select_agentic_checkout_protocol

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

2 D1 node

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

conformance_verdict, acp_gap_list feed Stage 2 fraud risk matrix

MCP Call · validate_acp_checkout

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

3 D1 catalog

APP Fraud Risk Matrix 26-app-fraud-matrix

fraud_exposure_score, mule_density_risk feed Stage 3 identity checks

4 D2 node

Agent Identity Attestation Checker art-04-agent-identity-attestation-checker

attestation_pass, identity_assurance_level feed Stage 3 trust chain validation

MCP Call · check_agent_attestation

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

5 D2 node

A2A Agent Card Trust Chain Validator art-32-a2a-agent-card-trust-chain-validator

trust_chain_depth, card_validity feed Stage 4 spend policy simulation

MCP Call · validate_a2a_trust_chain

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "validate_a2a_trust_chain",
    "arguments": {}
  },
  "id": 1
}

6 D3 node

Agent Spend Policy Simulator art-02-agent-spend-policy-simulator

spend_limits, velocity_cap, policy_flags feed Stage 4 traffic acceptance policy

MCP Call · simulate_spend_policy

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

7 D3 catalog

Agent Traffic Acceptance Policy Builder 498-agent-traffic-acceptance-policy-builder

traffic_policy_mandate, acceptance_gates feed Stage 5 settlement modeling

MCP Call · build_agent_traffic_acceptance_policy

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

8 TERMINAL node

x402 Settlement Modeler art-03-x402-settlement-modeler

settlement_model, net_exposure feed Stage 5 batch reconciliation

MCP Call · model_x402_settlement

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

9 TERMINAL node

x402 Batch Settlement Reconciler art-61-x402-batch-settlement-reconciler

batch_reconciliation, unmatched_payments feed Stage 5 receipt verification

MCP Call · reconcile_x402_batch_settlement

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "reconcile_x402_batch_settlement",
    "arguments": {}
  },
  "id": 1
}

10 TERMINAL node

AP2 Payment Receipt Verifier art-62-ap2-payment-receipt-verifier

receipt_hash, payment_verified feed Stage 5 final commerce conformance

MCP Call · verify_ap2_payment_receipt

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "verify_ap2_payment_receipt",
    "arguments": {}
  },
  "id": 1
}

11 TERMINAL node

Agent Commerce Conformance Validator art-30-agent-commerce-conformance-validator

conformance_certificate -- Exports agentic commerce mandate -- final stage

MCP Call · validate_agent_commerce_conformance

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

Agentic Commerce Checkout Chain