# Does Site Use Varnish

> Does Site Use Varnish is a paid API for AI agents from site.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Checks whether a website uses the Varnish HTTP cache by fetching its homepage and matching Varnish fingerprints in HTML and response headers, returning a yes/no answer with evidence.

## Facts

- Endpoint: GET https://site.intel.rallylive.ca/site/uses/varnish?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/does-site-use-varnish-82605fa2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iWqk4HWGugU88PaZYR76w

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 does-site-use-varnish-82605fa2
```

Example prompt: Can you check if shopify.com is using Varnish as its caching layer — I want to know if they rely on it and see what evidence shows up in the headers or HTML?

## When to prefer this

Use this endpoint when you need a fast, single-technology check specifically for Varnish on a given domain — ideal for sales prospecting, competitive technographic research, or pre-migration audits where you want targeted evidence (header values and HTML snippets) rather than a full technology stack scan. It is priced per call at $0.01, making it cost-effective for spot checks or batch prospecting workflows where Varnish detection is the specific signal needed.

## Known failure modes

- Domain is unreachable or returns an error, resulting in an inability to fetch the homepage
- Website blocks automated requests, potentially returning a misleading no-Varnish result
- Varnish is configured to hide its fingerprints, producing a false negative
- Input domain is malformed or missing, causing a validation error
- Rate limiting or network timeouts on the target site may cause incomplete analysis

## How this service works

Does a website use Varnish? Fetches the page (homepage for a bare domain) and matches Varnish's fingerprints in the HTML and response headers, returning yes/no with the evidence snippet and the category (cache). Technographics for sales, competitor research and migration planning, one technology per call. $0.01 per check.

## Output

Returns a yes/no answer indicating whether the target website uses Varnish, along with an evidence snippet (matching HTML content or response header values that triggered the fingerprint match) and a technology category label of 'cache'.

## 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/does-site-use-varnish-82605fa2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from site.intel.rallylive.ca](https://www.zero.xyz/host/site.intel.rallylive.ca/llms.txt)