# SignalHarness Agent Trace Latency Report

> SignalHarness Agent Trace Latency Report is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-13).

Analyzes and reports latency metrics from agent trace data supplied by the caller, returning a structured analysis with warnings and evidence scope.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/agent_trace_latency_report/invoke
- Price: $0.025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-agent-trace-latency-report-d1c4c710
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VjK6SRpqIUoQflcOE7wNy

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-agent-trace-latency-report-d1c4c710 -d '<json body>'
```

Example prompt: Can you run a latency report on this agent trace data I have — here's the JSON payload from our last execution run — and tell me if there are any performance issues?

## When to prefer this

Choose this endpoint when you have agent execution trace data in JSON form and need a structured latency report or performance breakdown. It is purpose-built for AI agent observability workflows on the SignalHarness platform, priced at $0.025 USDC per call via x402, making it suitable for lightweight, frequent performance checks. Prefer it over generic logging or APM tools when operating within a USDC-native agent payment flow.

## Known failure modes

- Invalid or malformed request_json causes a schema validation error
- Payload exceeds 65536 character limit, resulting in rejection
- Empty or too-short JSON string (minLength:2 not met) causes error
- Caller-supplied data that does not conform to expected trace format may produce warnings or degraded analysis
- Payment failure on x402 protocol results in 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 object containing a structured latency analysis derived from the caller-supplied trace data, including an analysis_json field with findings, a list of warnings (e.g. reminders to verify caller-supplied data), the service_id, and an evidence_scope label ('caller_supplied_data'). Also includes a full execution receipt with payment details, timing metadata, a result SHA256 hash, and status information.

## 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": "agent_trace_latency_report",
   "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": "agent_trace_latency_report",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "25000",
   "resultSha256": "024952945ccbbd5e3dd4000f2143af64add309bb5408961c4b4596357bd2806b",
   "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-agent-trace-latency-report-d1c4c710/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)