# QuietSignal URL Evidence

> QuietSignal URL Evidence 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 2026-09-15).

Fetches and returns machine-readable HTTP evidence (status code, final URL, redirect chain, HTTPS status) for any given public URL

## Facts

- Endpoint: GET https://83-29-153-50.sslip.io/v1/url-evidence
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quietsignal-url-evidence-df0e6fd1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XPgqIlAUoe65d8tyUInEi

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-url-evidence-df0e6fd1
```

Example prompt: Can you check if https://example.com/api/docs is live, whether it uses HTTPS, and where it finally lands after any redirects — following up to 3 hops?

## When to prefer this

Choose this endpoint when you need a lightweight, independent, read-only verification of whether a public URL is reachable, what HTTP status it returns, and where it resolves after redirects — especially when you need a neutral third-party check rather than trusting self-reported uptime. It is ideal for pre-flight link validation, redirect chain resolution, and HTTPS confirmation without running a full security audit.

## Known failure modes

- URL is not publicly accessible or behind authentication — may return non-200 status or connection error
- Invalid or malformed URL input causes request rejection
- Redirect count exceeds the specified max_redirects limit — stops following chain at that point
- Private/internal IPs or localhost URLs may be rejected
- DNS resolution failure for the given hostname
- Payment failure over HTTP 402 prevents the request from being processed

## 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 containing: whether the URL uses HTTPS, the HTTP status code returned, the final resolved URL after redirects, the originally requested URL, the number of redirects followed, and a disclaimer noting this is response evidence only (not a security audit or uptime guarantee).

## 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",
       "description": "Public HTTP(S) URL to inspect"
      },
      "max_redirects": {
       "type": "integer",
       "maximum": 5,
       "minimum": 0,
       "description": "Maximum validated public redirects to follow"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "https": true,
  "schema": "url-evidence/v1",
  "final_url": "https://example.com/",
  "disclaimer": "Public URL response evidence only; not a security audit or uptime guarantee.",
  "status_code": 200,
  "requested_url": "https://example.com/",
  "redirect_count": 0
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quietsignal-url-evidence-df0e6fd1/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)