OpenChainGraph Suite · CONTRACT A3 · arch #5

Agentic Payment Protocol Audit

A2A agent card validation > Google AP2 mandate building > X402 payload decode/flow simulation > Visa trusted agent protocol inspection — composite agentic payment protocol mandate.

OpenChainGraph · 4 Steps compliance mandate Hash-Anchored §4 chain_depth:4 Client-Side · Zero PII
Chain Topology — A2a Agent Card Validator → Google Ap2 Mandate Builder → X402 Payload Decoder Flow Simulator → Visa Trusted Agent Protocol Inspector
§4 Execution Hash · Chain Definition Anchor
execution_hash:computing…
Market Rationale
Buyer: Agentic Commerce Platform Engineer / Standards Compliance Lead
Forcing function: Mastercard AP4M Jun 2026; Visa TAP 2026; Google AP2 agent mandate ecosystem
Chain Stages · 4 Steps
1 ROOT · D0 catalog
A2a Agent Card Validator 283-a2a-agent-card-validator
agent_card_validity and trust_chain_gaps feed Stage 2 AP2 mandate builder
↓
2 D2 catalog
Google Ap2 Mandate Builder 285-google-ap2-mandate-builder
ap2_mandate and payment_parameters feed Stage 3 X402 payload simulation
↓
3 D3 catalog
X402 Payload Decoder Flow Simulator 277-x402-payload-decoder-flow-simulator
x402_flow_results and payment_protocol_compliance feed Stage 4 Visa TAP inspection
↓
4 TERMINAL · D4 catalog
Visa Trusted Agent Protocol Inspector 286-visa-trusted-agent-protocol-inspector
tap_inspection_report and composite_agentic_payment_mandate — final protocol audit mandate
Export Artifacts
Download the §4 chain definition artifact (hash-anchored composite JSON) or the §13.11 W3C Verifiable Credentials view. Both derive from the chain definition — no new hash is minted. Available after hash computation.