# ChainVerdict Pulse – x402 Endpoint Quality Verdict

> ChainVerdict Pulse – x402 Endpoint Quality Verdict is a paid API for AI agents from pulse.chainverdict.xyz, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Returns a live quality verdict for any x402 endpoint, including availability, latency percentiles, 402-offer conformance, price-drift, and payTo-stability flags.

## Facts

- Endpoint: GET https://pulse.chainverdict.xyz/v1/verdict
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainverdict-pulse-x402-endpoint-quality-verdict-ea7f922e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eh0vo0UgFxsvklXM3o-7K

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 chainverdict-pulse-x402-endpoint-quality-verdict-ea7f922e
```

Example prompt: Can you pull a live quality verdict for https://api.example.com/v1/someservice and tell me if it's available, conforming to x402 spec, and whether its price or payTo address have been drifting?

## When to prefer this

Use this endpoint when you need a live, objective, multi-dimensional quality assessment of a specific x402 endpoint before integrating it, routing traffic to it, or deciding whether to pay for its service. It is especially valuable for detecting price manipulation, payTo address changes, or latency degradation in micropayment APIs. Prefer this over generic uptime monitors because it understands x402 semantics (402 offer structure, payment destination, price conformance) natively.

## Known failure modes

- Invalid or unreachable URL returns an error or degraded verdict
- Non-x402 endpoints may return conformance failure with no useful latency data
- Transient network issues may cause availability to read as down when endpoint is healthy
- Price-drift and payTo flags may lag real-time changes by one probe cycle
- Malformed URL query parameter returns a 400-level error

## How this service works

API uptime and reliability monitoring for any x402 endpoint: a live quality verdict covering availability, uptime, latency percentiles, 402-offer conformance, price-drift and payTo-stability flags. Deterministic and re-verifiable.

## Output

A structured quality verdict object for the queried x402 endpoint, including: overall quality score and grade, availability status, latency percentile breakdowns (p50/p95/p99), 402-offer conformance result, a price-drift flag indicating whether pricing has changed recently, and a payTo-stability flag indicating whether the payment destination address has been consistent. Results are deterministic and re-verifiable.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string"
  },
  "verdict": {
   "type": "object",
   "properties": {
    "flags": {
     "type": "array",
     "items": {
      "type": "string"
     }
    },
    "grade": {
     "type": "string"
    },
    "score": {
     "type": "number"
    },
    "metrics": {
     "type": "object",
     "properties": {
      "availability": {
       "type": "number"
      },
      "latencyP50Ms": {
       "type": "number"
      },
      "latencyP95Ms": {
       "type": "number"
      }
     }
    },
    "reliabilityStreak": {
     "type": "object",
     "properties": {
      "daysObserved": {
       "type": "number"
      },
      "currentStreakDays": {
       "type": "number"
      },
      "longestStreakDays": {
       "type": "number"
      }
     }
    }
   }
  },
  "latestProbe": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-pulse-x402-endpoint-quality-verdict-ea7f922e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pulse.chainverdict.xyz](https://www.zero.xyz/host/pulse.chainverdict.xyz/llms.txt)