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Polygon Bridge Withdrawal Inspector
x402
Polygon Bridge Withdrawal Inspector is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Analyzes caller-supplied evidence for a Polygon PoS bridge withdrawal to determine its observed stage, amount consistency, and whether completion can be claimed — without inferring finality beyond what evidence supports.
Price / call$0.02
Success—
StatusUnknown
How this service works
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Output
Returns a structured analysis JSON including: the observed withdrawal stage (e.g. burn_event), whether amounts are consistent across stages, whether completion is claimed, network context (accepted chain IDs, bridge model, completion policy), a list of observed evidence types, per-record details (amount, token, ID), and any warnings about missing or insufficient proof. Also returns the evidence scope and analyzed network name.
Example use cases
Verify burn event before claiming exit
“I just bridged tokens from Polygon and have the burn event log with token 0xABC and atomic amount 500. Can you inspect this evidence to tell me what withdrawal stage is confirmed and whether I can claim completion yet?”
Audit bridge transaction evidence for a DeFi app
“I'm building a DeFi app and need to audit a set of Polygon bridge withdrawal evidence my user submitted — here's the raw event JSON with the burn record. Can you analyze it and flag any inconsistencies or missing checkpoint proofs?”
Detect incomplete bridge exit before releasing funds
“Before I release funds on the Ethereum side, I need to check this Polygon bridge withdrawal evidence — the JSON includes a burn event but I'm not sure if checkpoint inclusion is proven. Can you inspect it and warn me if completion hasn't actually been established?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/polygon_bridge_withdrawal_inspect/invokeWhen to prefer
Choose this endpoint when you need a conservative, evidence-bound analysis of a Polygon PoS bridge withdrawal that never infers finality beyond what the caller explicitly supplies. It is ideal for agents or DeFi applications that must avoid prematurely releasing funds or confirming exits before on-chain checkpoint evidence is verified. Prefer it over generic blockchain explorers when you need structured, machine-readable stage analysis with explicit warnings about missing proofs.
Side effects
- Malformed or unparseable request_json causes validation error
- Evidence JSON missing required fields returns incomplete analysis
- No checkpoint or finality evidence supplied — completion will never be claimed and a warning is returned
- Unsupported chain ID in evidence may result in rejection or unrecognized network context
- Service returns succeeded status even when evidence is insufficient — caller must check completion_claimed and warnings fields
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not claim checkpoint inclusion, exit success, or finality without supplied evidence."
],
"service_id": "polygon_bridge_withdrawal_inspect",
"analysis_json": "{\"amount_consistent\":true,\"amounts\":[{\"amount_atomic\":\"100\",\"stage\":\"burn_event\"}],\"completion_claimed\":false,\"network_context\":{\"accepted_chain_ids\":[\"137\",\"80002\"],\"bridge_model\":\"root-child state sync plus checkpoint evidence\",\"completion_policy\":\"never inferred without supplied evidence\",\"protocol_family\":\"Polygon PoS\"},\"observed_evidence\":[\"burn_event\"],\"observed_stage\":\"burn_event\",\"records\":{\"burn_event\":{\"amount_atomic\":\"100\",\"id\":\"1\",\"token\":\"0x0000000000000000000000000000000000000002\"}}}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "polygon"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "polygon_bridge_withdrawal_inspect",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "20000",
"resultSha256": "79c0a2ac29a75d7bc2d84b856b6515936825e7488fd742fd2e781017344f24d7",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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