# SignalHarness Cross-Chain Transfer Correlator

> SignalHarness Cross-Chain Transfer Correlator is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Analyzes caller-supplied data to correlate cross-chain transfer events across Solana, Base, and Polygon networks, identifying candidate transaction pairs and assessing bridge completion claims.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/crosschain_transfer_correlate/invoke
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-cross-chain-transfer-correlator-c39b89db
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gvV8bQCe3VyazsZEKqrSc

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 signalharness-cross-chain-transfer-correlator-c39b89db -d '<json body>'
```

Example prompt: I have transaction data from a bridge transfer I sent from Solana to Base — can you analyze it and tell me if there are matching candidate pairs and whether the bridge completion is actually claimed?

## When to prefer this

Choose this endpoint when you need to programmatically correlate cross-chain transfer events across Solana, Base, and Polygon from caller-supplied data — particularly when investigating bridge transactions or auditing multi-chain settlement. It is not a blockchain indexer or live chain scanner; it works only on data you provide and explicitly notes that correlation does not imply finality.

## Known failure modes

- Malformed or empty request_json causes parse failure
- No candidate pairs found if supplied data lacks matching signals
- Service may return warnings that correlation is inconclusive
- Bridge completion claim may be false even if pairs are matched
- Input data truncated if it exceeds 65536 character limit

## 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 containing candidate transaction pairs, a boolean indicating whether bridge completion is claimed, the analyzed network scope (solana_base_polygon), evidence scope label (caller_supplied_data), and any warnings — notably that correlation does not prove bridge finality.

## 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 never proves bridge completion or finality."
   ],
   "service_id": "crosschain_transfer_correlate",
   "analysis_json": "{\"candidate_pairs\":[],\"completion_claimed\":false}",
   "evidence_scope": "caller_supplied_data",
   "analyzed_network": "solana_base_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": "crosschain_transfer_correlate",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "30000",
   "resultSha256": "1cd3ef46ede9484f75bca26dbf1a7b619409b1d6d07af91d6d47a57e65503df8",
   "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/signalharness-cross-chain-transfer-correlator-c39b89db/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)