{
      "name": "agent-economy-marketplace",
      "domain": "Agent Economy",
      "title": "Agent-Service Marketplace Onboarding & Metering",
      "description": "W-F. Agent identity & authorization attestation (art-04) -> agent-traffic acceptance policy (art-21) -> service metering/pricing (ART-63). Onboards an agent service into a micropayment marketplace with a metered, policy-gated listing.",
      "composer_url": "https://ainumbers.co/chaingraph/chains/agent-economy-marketplace.html",
      "steps": [
        {
          "tool_id": "art-04-agent-identity-attestation-checker",
          "handoff": "attestation verdict (H1) feeds the traffic-policy builder"
        },
        {
          "tool_id": "art-21-agent-traffic-acceptance-policy-builder",
          "handoff": "acceptance policy (H2) feeds the metering modeler"
        },
        {
          "tool_id": "art-63-agent-service-metering-modeler",
          "handoff": "Exports composite marketplace artifact with execution_hash (H3) -- final stage"
        }
      ]
    }