# SignalHarness Search Result Filter

> SignalHarness Search Result Filter is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Filters and validates a JSON search result payload, returning a schema-validated analysis with warnings about caller-supplied data integrity.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/search_result_filter/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-search-result-filter-df561f91
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ul-R-355qGKQkYhH0S_AH

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-filter-df561f91 -d '<json body>'
```

Example prompt: Can you run this search result JSON through SignalHarness's search result filter to validate it and flag any data integrity warnings before I use it downstream? Here's the payload: {"results":[{"id":"abc","score":0.92,"title":"Example result"}]}

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call validation and filtering pass on a JSON search result payload before using it in an agent pipeline. It is best suited for agents operating in the x402 micropayment ecosystem on Base that need a fast, auditable integrity check with cryptographic receipts, rather than a full-featured search indexing or ranking service.

## Known failure modes

- Invalid or malformed JSON string in request_json field causes rejection
- Payload exceeds 65536 character limit returns an error
- Empty or too-short input (minLength 2) is rejected
- Payment failure on the x402 protocol causes the call not to execute
- Network issues on Base chain may delay receipt settlement

## 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 succeeded status with an analysis_json field containing schema-valid analysis of the submitted data, a warnings array highlighting any data integrity concerns (e.g. reminders to verify caller-supplied data), a service receipt with payment details (network, amount, asset), a SHA-256 hash of the result, and execution metadata including request/execution IDs and latency.

## 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_filter",
   "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_filter",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "d6867aba3ff5959d2d27f8838354255eb0548f9392a5f959eaaab0f66be218d5",
   "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-filter-df561f91/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)