Human-Not-Present Autonomous-Payment Guardrail

W-C. Spend-policy envelope (art-02) -> mandate scope & freshness (art-01) -> HNP guardrail verdict on the executed payment (ART-62). End-to-end gate for an agent paying with no human present.

OpenChainGraph · 3 Steps attestation mandate Hash-Anchored §4 chain_depth:3 Client-Side · Zero PII

Chain Stages · 3 Steps

1 ROOT · D0 node

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

spend envelope (H1) feeds the mandate validator

MCP Call · simulate_spend_policy

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

↓

2 D2 node

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

mandate scope/freshness (H2) feeds the HNP verifier

MCP Call · validate_ap2_mandate_chain

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

↓

3 TERMINAL · D3 node

AP2 PaymentReceipt Verifier & HNP Guardrail art-62-ap2-payment-receipt-verifier

Exports composite autonomous-guardrail artifact with execution_hash (H3) -- final stage

MCP Call · verify_ap2_payment_receipt

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