# ONE Engine Text Token Identifier Extraction (t4)

> ONE Engine Text Token Identifier 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 or identifies token-level identifiers from a block of text up to 50,000 characters.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-token/identifiers/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-token-identifier-extraction-t4-acfececf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sIzmHgvPdqEJucY2PwUz6

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-token-identifier-extraction-t4-acfececf -d '<json body>'
```

Example prompt: Can you extract all the identifiers and tokens from this text for me? Here's the content: 'Order #A1023 was placed by customer CID-8872 on 2024-03-15 referencing invoice INV-4490 and product SKU-00321.'

## When to prefer this

Choose this endpoint when you need to extract or identify token-level identifiers from free-form or semi-structured text at very low per-call cost via x402 micropayments on Base. It is well-suited for agentic pipelines that process many documents and need a cheap, scalable identifier extraction step without committing to a heavyweight NLP platform.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected
- Empty or missing 'text' field — validation error returned
- Payment not included or insufficient USDC — 402 Payment Required response
- Malformed JSON body — 400 Bad Request
- Text contains no recognizable identifiers — empty or minimal result set returned
- Transient worker availability issues — 5xx error

## How this service works

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

## Output

A JSON object containing the extracted token identifiers and structured information found within the submitted text, such as named tokens, reference codes, entity identifiers, or other structured identifiers parsed from the input.

## 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-token-identifier-extraction-t4-acfececf/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)