Bridge

Agent-to-Human (A2H) verification and escrow platform. Request physical-world tasks, define verification criteria (GPS, photos, timestamps, signatures, multi-witness), split work into milestones with partial payment, track worker reputation, and handle disputes. Escrow-by-Invariants: payment released only when ALL formal criteria pass.

Request human help for physical-world tasks. Bridge verifies the work was done before releasing payment.

Start the server

bash

uvicorn bridge.app:app --port 8015

Create a task with verification criteria

bash

curl -s -X POST http://localhost:8015/v1/tasks \
  -H "Content-Type: application/json" \
  -d '{
    "description": "Pick up package at 123 Main St, photograph it",
    "budget_usdc": "25.00",
    "verification_criteria": [
      {"type": "gps_proof", "description": "At pickup location", "params": {"latitude": 37.7749, "longitude": -122.4194, "radius_m": 100}},
      {"type": "photo_proof", "description": "Photo of package", "params": {"min_photos": 1}}
    ]
  }' | jq

Escrow is locked automatically. Fee is 5% of budget.

Submit proof and verify

bash

curl -s -X POST http://localhost:8015/v1/tasks/TASK_ID/verify \
  -H "Content-Type: application/json" \
  -d '{
    "worker_id": "worker-1",
    "proofs": [
      {"type": "gps_proof", "data": {"latitude": 37.7749, "longitude": -122.4194}},
      {"type": "photo_proof", "data": {"photo_hashes": ["sha256:abc123"]}}
    ]
  }' | jq

If ALL criteria pass → escrow released. If any fail → escrow held.

Dispute a task

bash

curl -s -X POST http://localhost:8015/v1/tasks/TASK_ID/dispute \
  -H "Content-Type: application/json" \
  -d '{"reason": "GPS proof appears faked"}' | jq

Freezes escrow. No verification possible while disputed.

Milestone-based tasks (partial payment)

bash

curl -s -X POST http://localhost:8015/v1/tasks \
  -H "Content-Type: application/json" \
  -d '{
    "description": "Two-step delivery",
    "budget_usdc": "100.00",
    "milestones": [
      {"description": "Pick up", "budget_pct": 40, "criteria": [{"type": "gps_proof", "description": "At pickup", "params": {"latitude": 37.77, "longitude": -122.42, "radius_m": 100}}]},
      {"description": "Deliver", "budget_pct": 60, "criteria": [{"type": "photo_proof", "description": "Photo", "params": {"min_photos": 1}}]}
    ]
  }' | jq

Verify milestones individually — each releases its share of the budget:

bash

curl -s -X POST http://localhost:8015/v1/tasks/TASK_ID/verify-milestone \
  -H "Content-Type: application/json" \
  -d '{"worker_id": "w", "milestone_index": 0, "proofs": [{"type": "gps_proof", "data": {"latitude": 37.77, "longitude": -122.42}}]}' | jq

Worker reputation

bash

curl -s http://localhost:8015/v1/workers | jq           # Leaderboard (sorted by score)
curl -s http://localhost:8015/v1/workers/worker-1 | jq  # Individual profile

Other endpoints

bash

curl -s http://localhost:8015/v1/tasks | jq                     # List all tasks
curl -s http://localhost:8015/v1/tasks?status=posted | jq       # Filter by status
curl -s http://localhost:8015/v1/tasks/TASK_ID/accept?worker_id=w -X POST  # Accept task
curl -s http://localhost:8015/v1/platforms | jq                  # Available platforms
curl -s http://localhost:8015/v1/stats | jq                     # Platform statistics

Verification types

Type	What it proves	How
gps_proof	Worker was at location	Haversine distance < radius
photo_proof	Photos submitted	Unique hash count >= min
timestamp_proof	Done within deadline	Elapsed hours < max
signature_proof	Cryptographic signature	Non-empty signature present
multi_witness	N agents confirm completion	Unique attesting witness count >= threshold

Surge pricing

• Standard: 5% base fee
• Urgent: +15% (total 20%)
• Critical: +40% (total 45%)

Escrow model

• Locked at task creation (budget held)
• Released only if ALL criteria pass (or per-milestone for milestone tasks)
• Frozen on dispute
• Refunded if deadline expires with no proof