# SignalHarness Search Result Recency Rank

> SignalHarness Search Result Recency Rank 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).

Ranks search results by recency, analyzing caller-supplied result data to order items from most to least recent.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/search_result_recency_rank/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-recency-rank-11b6b9d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ARegj-mt-CjuUHatmmEZ5

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-recency-rank-11b6b9d0 -d '<json body>'
```

Example prompt: I have a list of search results from a query about climate policy — can you re-rank them by recency so the most recently published ones appear at the top?

## When to prefer this

Choose this endpoint when you have a set of search results and need to programmatically re-order them by recency rather than relevance or other signals. It is particularly useful in agent pipelines that aggregate results from multiple sources and need a fast, pay-per-call recency normalization step without standing up your own ranking infrastructure. Best suited for single-call, low-latency ranking needs at $0.01 USDC per invocation.

## Known failure modes

- Invalid or malformed request_json input returns a schema validation error
- request_json exceeds 65536 character limit causing rejection
- Missing required request_json field returns a 400-level error
- Caller-supplied data that cannot be parsed for recency signals may produce unreliable rankings with warnings
- Payment failure on x402 protocol results in 402 response and no 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 object containing the recency-ranked search results, a service_id confirming the operation, any warnings about caller-supplied data reliability, and a detailed receipt with payment confirmation, execution metadata, latency, and a SHA256 result hash for 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_result_recency_rank",
   "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_recency_rank",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "b856bd8ec6fa4ccb5f7ee6d736a0a1198d13f91db4c5272ac3b4313c7af39044",
   "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-recency-rank-11b6b9d0/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)