# TD Agent Utility – URL Probe

> TD Agent Utility – URL Probe is a paid API for AI agents from td-agent-utility.duckdns.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-23).

Performs an independent HTTP reachability check on a given URL and returns pass/fail status with redirect-followed final URL and timestamp.

## Facts

- Endpoint: POST https://td-agent-utility.duckdns.org/v1/probe-url?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/td-agent-utility-url-probe-460a72ae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-n8GRJFqyO0Yol7HRa65Z

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 td-agent-utility-url-probe-460a72ae -d '<json body>'
```

Example prompt: Can you do an independent external check on https://myapp.example.com to confirm it's publicly reachable and tell me the final URL it lands on after any redirects?

## When to prefer this

Use this endpoint when you need an independent, external HTTP reachability check that is not subject to local network conditions or the agent's own connectivity — ideal for post-deployment verification, confirming public accessibility of APIs or websites, or validating redirect behavior. Prefer over self-hosted monitoring scripts when you need a neutral third-party perspective on liveness.

## Known failure modes

- URL is unreachable or returns a non-success HTTP status, resulting in result_status: FAIL
- Malformed or invalid URL input causes a request error
- Target server times out before responding
- DNS resolution failure for the given hostname
- Payment authorization failure via x402 before the probe executes

## How this service works

Independent public URL, HTTP, DNS, TLS, browser screenshot and deployment verification for AI agents. Pay per completed job with x402 V2 USDC on Base.

## Output

A JSON object containing the requested URL, the final URL after following any redirects, the UTC timestamp of the check, and a result_status of PASS or FAIL indicating whether the URL was publicly reachable.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "final_url": "https://example.com/",
  "checked_at": "2026-10-14T00:00:00+00:00",
  "requested_url": "https://example.com",
  "result_status": "PASS"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/td-agent-utility-url-probe-460a72ae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from td-agent-utility.duckdns.org](https://www.zero.xyz/host/td-agent-utility.duckdns.org/llms.txt)