# Latency Probe

> Latency Probe is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Sends three sequential timed HTTP GET requests to a URL from Cloudflare's edge and reports min/avg/max latency, jitter, per-attempt status, response size, and server/CDN header.

## Facts

- Endpoint: GET https://intel.rallylive.ca/monitor/latency
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/latency-probe-176c3dfe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XtY7Hv4xzNc2QG-EtChBO

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 latency-probe-176c3dfe
```

Example prompt: Can you run a latency probe on https://api.myservice.com/health and tell me the min, average, max response times and jitter measured from Cloudflare's edge?

## When to prefer this

Choose this endpoint when you need cheap, quick synthetic latency sampling from a global Cloudflare edge node — ideal for status dashboards, SLA spot-checks, and CDN/server identification. Prefer it over full uptime monitors when you want a one-shot multi-sample benchmark without setting up continuous polling infrastructure. It's particularly useful when you also need jitter data and server header inspection in a single cheap ($0.01) call.

## Known failure modes

- Target URL is unreachable or returns connection errors — individual attempt statuses reflect failures, latency may be null or maxed out
- Invalid or malformed URL input causes a 4xx error from the probe endpoint
- Target server rate-limits or blocks Cloudflare edge IPs, resulting in non-2xx statuses
- DNS resolution failures for the target URL produce error results per attempt
- Probe itself times out if the target is extremely slow, capping reported latency

## How this service works

Latency probe: three sequential timed requests to a URL from Cloudflare's edge, reporting min/avg/max/jitter in milliseconds, the status of each attempt, response size, and the server/CDN header. Cheap synthetic performance sampling for status dashboards and vendor SLAs. $0.01 per probe.

## Output

Returns min, average, and max round-trip latency in milliseconds across three sequential requests, jitter, the HTTP status code for each individual attempt, the response body size in bytes, and the Server or CDN header returned by the target — giving a lightweight synthetic performance snapshot from Cloudflare's edge.

## 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/latency-probe-176c3dfe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)