# SiteSignal URL Evidence

> SiteSignal URL Evidence is a paid API for AI agents from supported-rely-thee-portion.trycloudflare.com, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).

Captures a reproducible snapshot of a public webpage's status, redirects, content hash, and optional text-presence verification for monitoring and research purposes.

## Facts

- Endpoint: GET https://supported-rely-thee-portion.trycloudflare.com/x402/url-evidence
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitesignal-url-evidence-f172de9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ypQl99FMlhYIWjAsxAJZj

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 sitesignal-url-evidence-f172de9b
```

Example prompt: Can you snapshot https://example.com/terms and verify that the text 'last updated 2024' appears on the page, case-insensitively?

## When to prefer this

Choose this endpoint when you need a verifiable, reproducible record that a specific public URL was live at a point in time — especially when you also need to confirm specific text was present on the page. It is ideal for compliance audits, third-party content monitoring, and lightweight uptime checks where a content hash provides integrity evidence. Prefer it over general web scrapers when the goal is verification rather than data extraction, and over redirect-chain-specific endpoints when you also need content hash and text-presence evidence in a single call.

## Known failure modes

- URL is unreachable or times out — returns error with no snapshot
- Target URL requires authentication — publicly inaccessible content cannot be verified
- Expected text not found — returns false for text presence without error
- URL returns non-200 status — status is reported but content hash may be absent
- Malformed URI input — validation error returned before request is made
- Too many redirects — chain truncated or error returned beyond supported hop limit

## How this service works

Verify a public webpage with a bounded, reproducible snapshot of website status, redirects, content hash, and optional text-presence evidence for monitoring and research.

## Output

Returns a bounded, reproducible snapshot including the HTTP status code, redirect chain (URLs and status semantics), a content hash of the response body, and a boolean result indicating whether the optional expectedText was found on the page. Results are deterministic enough for audit trails and monitoring comparisons.

## 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": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri"
      },
      "expectedText": {
       "type": "string",
       "maxLength": 500
      },
      "caseSensitive": {
       "type": "boolean",
       "default": false
      }
     }
    }
   },
   "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/sitesignal-url-evidence-f172de9b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from supported-rely-thee-portion.trycloudflare.com](https://www.zero.xyz/host/supported-rely-thee-portion.trycloudflare.com/llms.txt)