# SignalHarness Search Result Cluster by Domain or Metadata

> SignalHarness Search Result Cluster by Domain or Metadata 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).

Clusters and groups API service search results by domain or metadata attributes to help agents discover related services

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/search_result_cluster_by_domain_or_metadata/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-cluster-by-domain-or-metadata-2b8f6c2c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__widLc1KRPHLwZtEN6aBE

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-cluster-by-domain-or-metadata-2b8f6c2c -d '<json body>'
```

Example prompt: Search the SignalHarness catalog and cluster the results by domain for all services related to financial data — I want to see how they're grouped by metadata or category.

## When to prefer this

Choose this endpoint when an agent needs to discover and organize API services from the SignalHarness catalog by domain or metadata grouping rather than receiving a flat list. Prefer it over a generic search when the agent needs to understand the landscape of related services grouped by category, or when comparing service types within a domain. Best for agent orchestration workflows where knowing the shape of available tools matters before selection.

## Known failure modes

- Invalid or malformed request_json may return an error or empty clusters
- Caller-supplied data that fails schema validation may produce unreliable clustering
- Service may return warnings if the input data cannot be fully verified
- Empty result set if no services match the domain or metadata criteria
- Payment failure on Base network may prevent 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 JSON analysis of clustered service results, grouped by domain or metadata attributes, along with warnings about caller-supplied data verification, a service ID, and a signed receipt including payment details, latency, and a SHA-256 result hash.

## 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_cluster_by_domain_or_metadata",
   "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_cluster_by_domain_or_metadata",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "2795c6b6028051b7046ec288b68ae0302dc429ce073901fd52652b03793166a5",
   "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-cluster-by-domain-or-metadata-2b8f6c2c/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)