ARTF Trading Layer

                    Consumer Agent
                          │
                    ┌─────┴─────┐
                    │           │
                    │  Request   │  RTBRequest { category, budget, preferences }
                    │           │
                    └─────┬─────┘
                          │
                          ▼
              ┌───────────────────────┐
              │                       │
              │   ARTF Orchestrator     │  Stateless request router
              │                       │  ── filter by match_score
              │   host: artf-exchange   │  ── dispatch to top-N agents
              │                       │  ── merge returned mutations
              └───────────┬───────────┘
                          │
            ┌─────────────┼─────────────┐
            │             │             │
            ▼             ▼             ▼
      ┌───────────┐ ┌───────────┐ ┌───────────┐
      │ Seller    │ │ Seller    │ │ Seller    │
      │ Agent A   │ │ Agent B   │ │ Agent C   │
      │           │ │           │ │           │
      │ catalog   │ │ catalog   │ │ catalog   │
      │ pricing   │ │ pricing   │ │ pricing   │
      │ trust     │ │ trust     │ │ trust     │
      └─────┬─────┘ └─────┬─────┘ └─────┬─────┘
            │             │             │
            └──────┐      │      ┌──────┘
                   ▼      ▼      ▼
              ┌───────────────────────┐
              │  GetMutations RPC       │  Each agent returns Mutation[]
              │  ← ACTIVATE_SEGMENTS    │
              │  ← BID_SHADE            │
              │  ← ADD_METRICS          │
              │  ← ACTIVATE_DEALS       │
              └───────────────────────┘

interface Mutation {
  intent: 'ACTIVATE_SEGMENTS' | 'BID_SHADE' | 'ADD_METRICS' | 'ACTIVATE_DEALS';
  op?:     'ADD' | 'REPLACE' | 'REMOVE';  // default: ADD
  path:   string;                         // JSON Pointer (RFC 6901)
  value:  Record<string, unknown>;        // Intent-specific payload
}

interface RTBRequest {
  id:    string;
  tmax:  number;   // max response time in ms
  bid_request: {
    user: { agent_id: string };
    imp:  Impression[];
  };
}

interface Impression {
  category:    string;
  budget_max:  number;
  preferences: Record<string, unknown>;
}

// Step 3 — Seller returns product matches
{ "intent": "ACTIVATE_SEGMENTS",
  "op": "ADD",
  "path": "/imp/1/product_matches",
  "value": {
    "ids": ["NIKE-AIR-MAX-90", "ASICS-GEL-1130"],
    "details": [
      { "id": "NIKE-AIR-MAX-90", "price": 3200, "stock": 47 },
      { "id": "ASICS-GEL-1130", "price": 2980, "stock": 23 }
    ]
  }
}

// Step 4 — Dynamic pricing with loyalty discount
{ "intent": "BID_SHADE",
  "path": "/seatbid/1/bid/1/price",
  "value": {
    "price": 2890, "original": 3200,
    "discount_pct": "9.7%",
    "reason": "loyalty_discount + volume_tier_2"
  }
}

// Step 5 — Verifiable trust signals
{ "intent": "ADD_METRICS",
  "path": "/seatbid/1/bid/1/trust",
  "value": {
    "trust_score": 94,
    "fulfillment_rate": 0.97,
    "return_rate": 0.03,
    "avg_delivery_days": 2.1
  }
}

// Step 6 — Deal finalization
{ "intent": "ACTIVATE_DEALS",
  "path": "/imp/1/pmp/deals",
  "value": {
    "deal_id": "deal-agent-a-nike-air-max-90",
    "product": "Nike Air Max 90",
    "final_price": 2890,
    "saved": 310,
    "trust": 94,
    "eta": "2 days"
  }
}