# Polygon Bridge Event Correlate

> Polygon Bridge Event Correlate is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-15).

Correlates Polygon PoS bridge events (root/child chain) by matching caller-supplied evidence such as transaction IDs and amounts to determine bridge completion status.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/polygon_bridge_event_correlate/invoke
- Price: $0.025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polygon-bridge-event-correlate-0f8013e6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qvixknhpsOVVOQ1HLchjj

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polygon-bridge-event-correlate-0f8013e6 -d '<json body>'
```

Example prompt: I sent tokens over the Polygon PoS bridge and need to know if the root-chain deposit event matches the child-chain withdrawal — can you correlate these bridge events using transaction ID 0xabc123 and an atomic amount of 1000000000000000000 on chain IDs 1 and 137?

## When to prefer this

Choose this endpoint when you need deterministic, evidence-based correlation of Polygon PoS bridge events between root and child chains — particularly when you have raw event data (transaction IDs, atomic amounts) and need to programmatically verify matching without relying on a third-party finality oracle. It is ideal for DeFi agents, bridge monitoring systems, or audit tools targeting Polygon mainnet (137) or Amoy testnet (80002) that need structured match/conflict analysis rather than a simple boolean status check.

## Known failure modes

- Malformed or missing request_json input causes a validation error
- Unsupported chain IDs (not 137 or 80002) result in an error or empty analysis
- Incomplete event data with missing ID or amount fields may produce unmatched results rather than matches
- No evidence supplied for completion means completion_claimed will always be false
- Large payloads approaching the 65536-character limit may be rejected

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON analysis object containing: a list of matched root-child bridge event pairs with supporting evidence fields (e.g. id, amount_atomic) and any conflicts; a list of unmatched child events; a boolean indicating whether completion is claimed; network context including accepted chain IDs, bridge model description, and completion policy; plus a warnings array noting that results are deterministic evidence matching, not a finality oracle.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request_json": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Correlation is deterministic evidence matching, not a finality oracle."
   ],
   "service_id": "polygon_bridge_event_correlate",
   "analysis_json": "{\"completion_claimed\":false,\"matches\":[{\"child_index\":0,\"conflicts\":[],\"evidence\":[\"id\",\"amount_atomic\"],\"root_index\":0}],\"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\"},\"unmatched_child\":[]}",
   "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_event_correlate",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "25000",
   "resultSha256": "475ac4c39646666364b1487cb49f320b5f79481d73c1bd2a5270080ad388424c",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polygon-bridge-event-correlate-0f8013e6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)