# ONE Engine Text Mention Extractor (t4)

> ONE Engine Text Mention Extractor (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 entity mentions from a block of text, returning structured mention data for downstream agent processing.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-extract/mentions/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-mention-extractor-t4-0cd68b90
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QL9HbbFSzqCsY6j-9kD4q

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-mention-extractor-t4-0cd68b90 -d '<json body>'
```

Example prompt: Can you extract all the mentions from this article text I'm about to paste — I need a structured list of everything that's referenced in it?

## When to prefer this

Choose this endpoint when you need lightweight, low-cost mention extraction from a text blob without standing up your own NLP pipeline. At $0.0015 USDC per call via x402 on Base, it is well-suited for high-volume autonomous agent workflows that need to identify references and entities in unstructured text programmatically.

## Known failure modes

- Text exceeds 50000 character limit — request rejected
- Empty or missing 'text' field — validation error
- Payment failure via x402 on Base — 402 response before processing
- Ambiguous or very short text may yield sparse or empty mention results
- Malformed JSON request body — 400 error

## How this service works

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

## Output

A JSON object containing structured mention data extracted from the input text — typically including the identified mentions, their positions or context within the text, and associated metadata about each referenced entity or term.

## 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-mention-extractor-t4-0cd68b90/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)