# SignalHarness Search Result Evidence Coverage

> SignalHarness Search Result Evidence Coverage is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).

Analyzes caller-supplied search result data to assess evidence coverage and return a structured analysis with warnings about data provenance.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/search_result_evidence_coverage/invoke
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-search-result-evidence-coverage-57a80a5c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3D36asXCC36PPOI8TaoIJ

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-search-result-evidence-coverage-57a80a5c -d '<json body>'
```

Example prompt: Can you check the evidence coverage of these search results I've gathered? Here's the raw JSON: {"query":"climate change impacts","results":[{"title":"Study A","url":"...","snippet":"..."}]} — I want to know how well-supported the results are.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call analysis of search result evidence quality without managing your own validation pipeline. Best suited for agents that retrieve web search results and need a quick evidence-coverage audit before downstream processing. Prefer over custom validation when you want a receipted, auditable result with provenance warnings included.

## Known failure modes

- Malformed or non-JSON request_json input causes validation failure
- Payload exceeds 65536 character limit, rejected at input
- Caller-supplied data is flagged as unverified — warnings returned but analysis still proceeds
- Payment not confirmed, endpoint returns 402 and does not execute
- Empty or minimal JSON input may yield low-confidence or trivial analysis

## 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 object containing an analysis_json field with evidence coverage details, an evidence_scope field (e.g. 'caller_supplied_data'), a list of warnings about data provenance, and a full payment receipt with execution metadata including latency, payment ID, and a SHA-256 hash of the result.

## 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": "search_result_evidence_coverage",
   "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": "search_result_evidence_coverage",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "15000",
   "resultSha256": "7a0f793bc847c155a0bcdf9daed790ff9d5b494185513b4e9ed6c287c31c9b49",
   "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-search-result-evidence-coverage-57a80a5c/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)