Agentic Commerce Convergence

Note (dated 2026-08-06): a chain composes independent computations performed in an analytical order. No step's output is carried into the next step by the execution model; each step computes from its own declared inputs. This is true of every chain on this site, including chains whose per-step copy below reads as a data handoff.

Binds one agent-run transaction across three independent agentic-commerce layers into a single hash-anchored composite: UCP cart/checkout discovery, ACP checkout conformance, and the AP2 payment mandate. UCP composes with AP2 rather than competing with it (Google developer blog); this chain evidences that composition as one dated receipt. Each step keeps its own verdict scope, never merged into a single cross-layer determination.

OpenChainGraph · 3 Steps compliance mandate Hash-Anchored chain_depth:3 Client-Side · Zero PII

Chain Stages · 3 Steps

1 ROOT node

UCP Checkout Payload Lint art-564-ucp-checkout-payload-lint

Produces UCP cart/checkout resource conformance (CONFORMANT / NONCONFORMANT / UNKNOWN_VERSION) against the pinned v2026-04-08 schema, evidencing the discovery/cart layer of this declared transaction; each step keeps its own verdict scope, never merged into a single cross-layer determination

MCP Call · lint_ucp_checkout_payload

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

↓

2 D2 node

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

Produces ACP checkout-session conformance findings over the same caller-declared amount/currency/merchant identity fields, evidencing the checkout layer of this declared transaction

MCP Call · validate_acp_checkout

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

↓

3 TERMINAL node

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

AP2 mandate-chain integrity determination over the same caller-declared amount/currency/merchant identity fields, closing the composite as the payment-authorization layer; terminal stage

MCP Call · validate_ap2_mandate_chain

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