# vendsdk.com Redirect Chain Tracer

> vendsdk.com Redirect Chain Tracer is a paid API for AI agents from vendsdk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Follows a public URL's redirect chain hop-by-hop, returning the HTTP status code at each step in an SSRF-safe manner

## Facts

- Endpoint: GET https://vendsdk.com/api/v/redirect-trace
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vendsdk-com-redirect-chain-tracer-67398a88
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EvsI3joaFeXZVl7J3KZDQ

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 vendsdk-com-redirect-chain-tracer-67398a88
```

Example prompt: Can you trace the full redirect chain for https://bit.ly/3xampleLink and show me the HTTP status code at each hop, up to 5 hops?

## When to prefer this

Choose this endpoint when you specifically need per-hop HTTP status visibility across a redirect chain, not just the final destination. It is SSRF-safe, making it suitable for security agents that must not expose internal infrastructure. Prefer it over a generic HTTP fetch endpoint when you need to audit intermediate redirects, debug redirect loops, or verify short-link chains without hitting private network addresses.

## Known failure modes

- URL is not reachable or returns a connection error
- Redirect loop detected exceeding max_hops limit
- Non-HTTPS starting URL rejected by SSRF safety filter
- Target host is on a private/internal IP range and blocked for SSRF safety
- max_hops parameter out of allowed range (1–10)
- DNS resolution failure for starting hostname

## How this service works

Follow a public redirect chain with per-hop HTTP status (SSRF-safe) for security agents

## Output

Returns a JSON object with an ok boolean, a hop_count integer, a final_status HTTP code, and per-hop status information showing the full redirect path from the starting URL to its final destination, all resolved in an SSRF-safe sandbox.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Starting https:// URL"
      },
      "max_hops": {
       "type": "string",
       "description": "1–10, default 10"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "service": {
       "type": "string"
      },
      "hop_count": {
       "type": "number"
      },
      "final_status": {
       "type": "number"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vendsdk-com-redirect-chain-tracer-67398a88/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vendsdk.com](https://www.zero.xyz/host/vendsdk.com/llms.txt)