ART-22 · Root Node · Agentic Rail Chain · OpenChainGraph

Agentic Payments Protocol Comparator & Field Crosswalk

The agentic-commerce field is fragmenting into card-network, platform, and crypto camps that all overlap. Compare AP2, the Agentic Commerce Protocol (Shared Payment Token), x402, Visa Trusted Agent Protocol, and Mastercard Agent Pay side by side across credential model, signing, scope, settlement rail, identity substrate, and audit trail — plus a field crosswalk and a scenario recommender. Produces a §4 routing_policy OpenChainGraph artifact.

⚠ These specifications version monthly and figures vary across sources. Reference data here is a June 2026 snapshot for orientation, not authoritative spec text. Re-verify against each protocol's primary source before designing against it.
§4 OpenChainGraph · ART-22 AP2 · ACP · x402 · Visa TAP · MC Zero PII Client-Side · No Network
▸ Protocols to compare
Toggle the protocols to include in the matrix and crosswalk. All five are selected by default.
▸ Scenario Recommender (optional)
Pick a use case to get a deterministic, rule-based fit suggestion (with rationale and caveats).

Ask your agent

Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this exact tool, with this sample, and verify the artifact.

Run the AINumbers MCP tool `compare_agentic_rail_protocols`. Task: Compare AP2, ACP, x402, Visa TAP, Mastercard Agentic Token, and Tempo MPP (Machine Payments Protocol) across 8 dimensions (backer, artifact, signing, scope, rail, identity, audit, status) and 6 agentic scenarios.
Call it with arguments: {"policy_parameters":{"protocols":["ap2","acp"],"scenario":"cross_merchant"}}
Verify before trusting: call `verify_execution_hash` on mcp.ainumbers.co (https://mcp.ainumbers.co/mcp) with the parameter `claimed_hash` set to the returned `execution_hash`, passing the full artifact the run returned (the object containing `policy_parameters` + `output_payload` + `execution_hash`; equivalently `policy_parameters` + `output_payload` with `claimed_hash`), not the bare hash string.
Return the ledger link https://ledger.ainumbers.co/ so a human can re-verify without contacting us.
PII rule: All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Open the tool with the sample prefilled: https://ainumbers.co/chaingraph/art-22-agentic-payments-protocol-comparator.html#p=v1.H4sIAAAAAAAA_wE3AMj_eyJwcm90b2NvbHMiOlsiYXAyIiwiYWNwIl0sInNjZW5hcmlvIjoiY3Jvc3NfbWVyY2hhbnQifZhEClE3AAAA