# QuietSignal Catalog Health Check

> QuietSignal Catalog Health Check is a paid API for AI agents from 83-29-153-50.sslip.io, paid per call via x402, $0.01/call, status down (last checked 2026-10-13).

Returns HTTP liveness status and counts (alive, dead, timeout, 4xx, 5xx) for public PayanAgent offer endpoints from the QuietSignal catalog.

## Facts

- Endpoint: GET https://83-29-153-50.sslip.io/v1/catalog-health?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quietsignal-catalog-health-check-5b00ff29
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UqUFUnlVkW3MpAgDz7UaH

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 quietsignal-catalog-health-check-5b00ff29
```

Example prompt: Check the QuietSignal catalog health and tell me how many public PayanAgent offers are currently alive versus dead or timing out — probe up to 50 of them.

## When to prefer this

Use this endpoint when you need a fast, read-only liveness snapshot of PayanAgent public offer endpoints without triggering any payments or seller-side execution. Prefer it over full catalog browsing when you only need aggregate health counts (alive/dead/timeout/error class) to decide whether the gateway is operational before committing to downstream agent calls.

## Known failure modes

- Limit parameter out of range (1-100) returns validation error
- Network timeout if the sslip.io host is unreachable
- HTTP 402 payment required if USDC payment over x402 is not provided
- Empty results array if no public offers exist in the catalog
- Partial results if some gateway probes time out during the health sweep

## How this service works

QuietSignal Public Data: independent, read-only rollup, wallet, opportunity, and developer-data facts for agents, paid per request with USDC over HTTP 402 on Base.

## Output

A JSON object with a 'counts' breakdown (alive, dead, timeout, 4xx, 5xx), a schema version string ('catalog-health/v1'), source metadata identifying the provider as PayanAgent and the probe surface as the public buyUrl gateway, a 'results' array of probed endpoint details, a returned_count integer, and a disclaimer confirming no payments or seller executions were attempted.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1,
       "description": "Maximum number of public PayanAgent offers to probe"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "counts": {
   "4xx": 0,
   "5xx": 0,
   "dead": 0,
   "alive": 1,
   "timeout": 0
  },
  "schema": "catalog-health/v1",
  "source": {
   "provider": "PayanAgent",
   "probe_surface": "public buyUrl gateway"
  },
  "results": [],
  "disclaimer": "Unpaid HTTP liveness facts; no payment calls or seller execution were attempted.",
  "returned_count": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quietsignal-catalog-health-check-5b00ff29/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 83-29-153-50.sslip.io](https://www.zero.xyz/host/83-29-153-50.sslip.io/llms.txt)