# SignalHarness Crosschain Activity Forensic Report

> SignalHarness Crosschain Activity Forensic Report is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Analyzes and correlates caller-supplied transaction records across multiple blockchains (Base, Polygon, Solana) to produce a structured forensic timeline and evidence report.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/crosschain_activity_forensic_report/invoke
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-crosschain-activity-forensic-report-862e6cca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kymNQH689P7j-DYv1-Wtt

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-crosschain-activity-forensic-report-862e6cca -d '<json body>'
```

Example prompt: I have transaction records from Base, Polygon, and Solana that I think are related — can you run a crosschain forensic analysis on them and give me a structured report showing any correlations, timeline, fees, and evidence gaps?

## When to prefer this

Choose this endpoint when you need a structured, multi-chain forensic correlation of transaction records you already possess — across Base, Polygon, and/or Solana — and want a machine-readable timeline and evidence gap analysis. Prefer this over single-chain block explorers when cross-chain correlation is essential. Note that conclusions are limited to caller-supplied data and do not independently verify on-chain authenticity or ownership.

## Known failure modes

- Malformed or empty request_json returns a parse or validation error
- Evidence gaps flagged when supplied data is incomplete or inconsistent across chains
- No correlations found if transaction records share no linkable fields
- Service may return warnings even on success indicating limits of forensic conclusions
- Oversized request_json (>65536 chars) rejected by schema validation

## 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 forensic report including: identified chains analyzed, correlation findings between supplied records, a timeline with event ordering, fee records, evidence gap flags (e.g. authenticity not verified, ownership not inferred, finality not verified), and the scope of evidence (caller-supplied data only). Includes standard warnings that the report does not prove authenticity, ownership, confirmation, finality, or safety.

## 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": [
    "Does not prove authenticity, ownership, confirmation, finality, or safety."
   ],
   "service_id": "crosschain_activity_forensic_report",
   "analysis_json": "{\"chains\":[\"base\",\"polygon\",\"solana\"],\"correlations\":[],\"evidence_gaps\":[\"authenticity_not_verified\",\"ownership_not_inferred\",\"finality_not_verified\"],\"fees\":[],\"records\":[{\"chain\":\"solana\",\"id\":\"s1\",\"index\":0,\"status\":\"supplied\"},{\"chain\":\"base\",\"id\":\"b1\",\"index\":1,\"status\":\"supplied\"},{\"chain\":\"polygon\",\"id\":\"p1\",\"index\":2,\"status\":\"supplied\"}],\"timeline\":{\"ambiguous_order\":false,\"count\":0,\"events\":[]}}",
   "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_activity_forensic_report",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "50000",
   "resultSha256": "53c212d18c628fb1f89d10270f3e283206cc32ff1c04075d57c5ca3cb571c2b7",
   "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-crosschain-activity-forensic-report-862e6cca/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)