# SignalHarness Search Filter Validate

> SignalHarness Search Filter Validate is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Validates and analyzes caller-supplied JSON data against a search/filter schema, returning a structured analysis with warnings about data quality.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/search_filter_validate/invoke
- Price: $0.005/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-filter-validate-fa8a3e7e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wQWsAMMdDN2nTt9bA3Seg

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-filter-validate-fa8a3e7e -d '<json body>'
```

Example prompt: Can you validate this JSON payload for me and flag any warnings before I send it downstream: {"query": "electronics", "filters": {"price_max": 500, "in_stock": true}}?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call JSON validation and analysis step within an agent pipeline — particularly when you want warnings about caller-supplied data quality before passing it downstream. Ideal for agentic workflows where data provenance matters and you want an immutable receipt (with SHA-256 result hash) proving what was validated. Less suitable for schema validation against a custom user-defined schema or for large-scale batch validation.

## Known failure modes

- Invalid or malformed JSON string input returns an error without analysis
- Empty or too-short request_json (minLength: 2) triggers validation failure
- Payload exceeding 65536 characters is rejected
- Network or service timeout may result in failed status with no analysis
- Payment failure via x402 protocol prevents execution

## 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 result containing an analysis_json field with the parsed assessment of the input data, a warnings array listing any data quality concerns, an evidence_scope field indicating the data source was caller-supplied, and a full receipt with payment confirmation, request/execution IDs, latency, and a SHA-256 hash of the result for integrity verification.

## 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_filter_validate",
   "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_filter_validate",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "5000",
   "resultSha256": "4de4b32ee30076c849505153b35edb0ca0ba4fb734f01794db8eca32dacfe85f",
   "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-filter-validate-fa8a3e7e/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)