# AgentProof Check URL Alive

> AgentProof Check URL Alive is a paid API for AI agents from agentproof.hatchable.site, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).

Checks whether a given URL is alive/reachable and returns a machine-verifiable provenance receipt with integrity hash

## Facts

- Endpoint: POST https://agentproof.hatchable.site/api/paid/check_url_alive?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentproof-check-url-alive-53fc3193
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zVN8-HnDgsECFSF3QoeUS

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 agentproof-check-url-alive-53fc3193 -d '<json body>'
```

Example prompt: Can you check if https://api.example.com/health is alive right now and give me a tamper-evident receipt proving it was reachable?

## When to prefer this

Choose this endpoint when you need not just a liveness check but a machine-verifiable, tamper-evident receipt proving the check occurred — particularly useful for autonomous agent workflows, audit trails, or pre-transaction validation where proof of URL reachability at a specific moment is required. Prefer over generic uptime monitors when cryptographic provenance is important.

## Known failure modes

- URL is unreachable or returns non-2xx — ok may be false
- Invalid or malformed URL input — likely 4xx error response
- Network timeout reaching the target URL — may result in ok:false or error
- Payment failure (x402) — request rejected before check is performed
- Target URL blocks probe requests (e.g. firewall, bot detection) — false negative possible

## How this service works

AgentProof publishes Agent Transaction Passport™ and provides machine-paid evidence, provenance receipts, source comparison and change monitoring for autonomous transactions.

## Output

A JSON object with an 'ok' boolean indicating reachability, the tool name ('check_url_alive'), a provenance receipt containing a UUID receipt ID and an integrity SHA-256 hash, and the service name 'AgentProof'. This receipt serves as machine-verifiable evidence that the URL was checked at a given moment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri"
  },
  "claim": {
   "type": "string"
  },
  "email": {
   "type": "string"
  },
  "phone": {
   "type": "string"
  },
  "contactName": {
   "type": "string"
  },
  "previousSha256": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "check_url_alive",
  "receipt": {
   "id": "uuid",
   "integrity_sha256": "..."
  },
  "service": "AgentProof"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentproof-check-url-alive-53fc3193/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentproof.hatchable.site](https://www.zero.xyz/host/agentproof.hatchable.site/llms.txt)