# ONE Engine Text Hashtag Extractor (t4)

> ONE Engine Text Hashtag 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 relevant hashtags from a given block of text up to 50,000 characters

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-token/hashtags/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-hashtag-extractor-t4-2e479e60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UoOhbNfdlix2XQbUFGnMy

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-hashtag-extractor-t4-2e479e60 -d '<json body>'
```

Example prompt: Pull relevant hashtags from this article text: 'Artificial intelligence is transforming the healthcare industry by enabling faster diagnosis, personalized treatment plans, and predictive analytics for patient outcomes.'

## When to prefer this

Choose this endpoint when you need a cheap, pay-per-call hashtag extraction service for autonomous agents operating on Base via x402, especially for pipeline automation where cost per call matters. Ideal when you need hashtags programmatically from arbitrary text without managing a full NLP platform subscription.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected or truncated
- Empty or whitespace-only text input returns no hashtags or an error
- Text in rare or unsupported languages may produce low-quality or no hashtags
- Payment failure via x402 on Base results in 402 response and no processing
- Ambiguous or very short text may yield generic or low-relevance hashtags

## How this service works

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

## Output

Returns a JSON object containing extracted or suggested hashtags derived from the input text, representing the key topics, themes, and concepts present in the content.

## 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-hashtag-extractor-t4-2e479e60/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)