# ONE Engine URL Analysis Pack Tier 4

> ONE Engine URL Analysis Pack Tier 4 is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0018/call, status unknown (last checked 2026-10-02).

Performs a comprehensive tier-4 URL analysis on a given URL, returning deep analytical results via a pay-per-call x402 API on Base.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v2/url-analysis-pack/t4?utm_source=zero.xyz
- Price: $0.0018/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-url-analysis-pack-tier-4-74e4facb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a8T3I6qva-mcwKlOLB30F

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 one-engine-url-analysis-pack-tier-4-74e4facb -d '<json body>'
```

Example prompt: Can you run a full tier-4 analysis on this URL for me: https://example.com/some-page — I want as much detail as possible about it.

## When to prefer this

Choose this endpoint when you need the most comprehensive tier of URL analysis available from ONE Engine (tier 4 being the highest/deepest), and cost-per-call economics are acceptable at $0.0018 USDC. Prefer this over lower-tier siblings when depth of analysis matters more than cost savings.

## Known failure modes

- Invalid or malformed URL input returns an error response
- Payment failure via x402 prevents access to results
- URL is unreachable or returns a non-200 status, potentially limiting analysis depth
- Rate limiting or quota exhaustion on the Cloudflare Worker
- Ambiguous or sparse result if the URL resolves to minimal content

## How this service works

Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.

## Output

A JSON object containing a 'tier' field (set to 4) and a 'result' field with tier-4-level analytical output about the submitted URL, which may include metadata, content signals, risk indicators, or other structured URL intelligence depending on the service's implementation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tier": 4,
  "result": "Tier-dependent output"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-url-analysis-pack-tier-4-74e4facb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from one-search.one-engine.workers.dev](https://www.zero.xyz/host/one-search.one-engine.workers.dev/llms.txt)