# VYTREL Control URL Proof

> VYTREL Control URL Proof is a paid API for AI agents from vytrel-control.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Verifies that a public HTTPS URL is reachable, returning status, latency, redirect chain, content type, and a SHA-256 hash of a content sample.

## Facts

- Endpoint: GET https://vytrel-control.vercel.app/api/url-proof?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vytrel-control-url-proof-5c223416
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_f_uBLnKTVAfKxnBlDtFrZ

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 vytrel-control-url-proof-5c223416
```

Example prompt: Can you verify that https://example.com/my-report.pdf is reachable and tell me its HTTP status, how fast it responded, where it ends up after any redirects, and give me a SHA-256 fingerprint of its content?

## When to prefer this

Choose this endpoint when you need a lightweight, paid-per-call proof that a specific public HTTPS URL is live, including redirect resolution, content fingerprinting via SHA-256, and latency measurement — particularly when you need cryptographic evidence of what was at a URL at a given moment, or when building automated link-health checks into a workflow.

## Known failure modes

- URL is unreachable or times out — ok: false with no status code
- URL requires authentication — returns 401 or 403 with ok: false
- Invalid or non-HTTPS URL provided — validation error on input
- DNS resolution failure for the given hostname
- URL redirects in a loop — possible error or truncated redirect array

## How this service works

Machine-payable URL observations and Base wallet reads, with x402 settlement receipts.

## Output

A JSON object indicating whether the URL was reachable (ok: boolean), the HTTP status code, the final URL after any redirects, an array of intermediate redirect URLs, the content type, number of bytes sampled, a SHA-256 hex hash of the sampled content, total latency in milliseconds, and the timestamp when the check was performed.

## 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",
       "description": "Public HTTPS URL to verify"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "requestedUrl",
      "latencyMs",
      "checkedAt"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "status": {
       "type": "number"
      },
      "finalUrl": {
       "type": "string"
      },
      "checkedAt": {
       "type": "string"
      },
      "latencyMs": {
       "type": "number"
      },
      "redirects": {
       "type": "array"
      },
      "contentType": {
       "type": [
        "string",
        "null"
       ]
      },
      "bytesSampled": {
       "type": "number"
      },
      "requestedUrl": {
       "type": "string"
      },
      "sampleSha256": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "scope": "One observation from VYTREL's server; sampled bytes only.",
  "status": 200,
  "finalUrl": "https://example.com/",
  "checkedAt": "2026-10-01T17:00:00.000Z",
  "latencyMs": 120,
  "redirects": [],
  "upstreamOk": true,
  "contentType": "text/html",
  "bytesSampled": 1256,
  "requestedUrl": "https://example.com/",
  "sampleSha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "sampleTruncated": false,
  "sampleLimitBytes": 65536
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vytrel-control-url-proof-5c223416/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vytrel-control.vercel.app](https://www.zero.xyz/host/vytrel-control.vercel.app/llms.txt)