# ONE Engine Text Domain Extraction (t4)

> ONE Engine Text Domain Extraction (t4) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0015/call, status unknown (last checked 2026-10-02).

Extracts domain names or URLs from unstructured text input up to 50,000 characters.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-extract/domains/t4?utm_source=zero.xyz
- Price: $0.0015/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-text-domain-extraction-t4-ae00ad03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EIMX2IzTAyixNyV1LyTwW

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-text-domain-extraction-t4-ae00ad03 -d '<json body>'
```

Example prompt: Extract all domain names mentioned in this text: 'We reviewed products from apple.com, google.com, and microsoft.com, and also noticed references to cloudflare.com and vercel.dev in the documentation.'

## When to prefer this

Choose this endpoint when you need a cheap, fast, pay-per-call extraction of domain names or URLs from a block of text without setting up a heavier NLP pipeline. It is especially suitable for autonomous agents that process variable text volumes and want microtransaction-based pricing via x402 on Base, rather than subscription APIs. Prefer it over regex-only solutions when you want a managed, API-backed extraction service.

## Known failure modes

- Text exceeding 50,000 characters may be rejected or truncated
- No domains present in the text results in an empty or null domain list
- Malformed or ambiguous text may produce incomplete extraction
- Payment failure via x402/Base may result in 402 response before processing
- Rate limiting or worker availability issues may cause transient 5xx errors

## How this service works

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

## Output

A JSON object containing the domains or URLs extracted from the provided text, returned as structured data with no fixed schema (additionalProperties: true), so the agent should expect a flexible response object listing detected domain entities.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "Text up to 50000 characters"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-text-domain-extraction-t4-ae00ad03/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)