# SignalHarness Multi-Source Claim Evidence Report

> SignalHarness Multi-Source Claim Evidence Report 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 and aggregates evidence from multiple sources to evaluate the validity of a given claim, returning a structured JSON analysis report.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/multi_source_claim_evidence_report/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-multi-source-claim-evidence-report-584c3489
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P5l7xFo40_0ko8LKBBbuf

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-multi-source-claim-evidence-report-584c3489 -d '<json body>'
```

Example prompt: Can you run a multi-source claim evidence report on this assertion: 'Electric vehicles produce more lifecycle CO2 than internal combustion engines' — I want a structured analysis with all supporting and contradicting evidence collected?

## When to prefer this

Choose this endpoint when you need a structured, multi-source evidence evaluation of a specific claim and want a receipt-backed, auditable JSON report. It is especially useful for agent pipelines that need to justify decisions with evidence, verify factual assertions before acting on them, or produce compliance-ready documentation of claim analysis. Prefer this over generic web search when you need a normalized, schema-consistent evidence report with payment receipt provenance.

## Known failure modes

- Malformed or empty request_json returns a validation error
- Claim context is ambiguous leading to low-confidence or generic analysis output
- Evidence scope limited to caller-supplied data if external sources are unavailable
- Service may return warnings when input data cannot be independently verified
- Payment failure on Base network results in HTTP 402 and no analysis returned

## 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 structured JSON analysis containing an evidence scope field, an analysis_json string with the aggregated findings, any applicable warnings (e.g. to verify caller-supplied data), and a full service receipt including payment ID, result hash, network info, and execution metadata.

## 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": [
    "Verify the caller-supplied data before relying on this result."
   ],
   "service_id": "multi_source_claim_evidence_report",
   "analysis_json": "{\"example\":\"schema-valid caller-supplied data\"}",
   "evidence_scope": "caller_supplied_data"
  },
  "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": "multi_source_claim_evidence_report",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "30000",
   "resultSha256": "4d9632a41e9f60846455763ce1296e4b1c0aedd423d611c784c4fb286ef229d4",
   "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-multi-source-claim-evidence-report-584c3489/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)