# ONE Engine Hashtag Extractor (T3)

> ONE Engine Hashtag Extractor (T3) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Extracts relevant hashtags from a block of text up to 50,000 characters

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-token/hashtags/t3?utm_source=zero.xyz
- Price: $0.001/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-hashtag-extractor-t3-1a9d6522
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CAsvCv_sOMwBCyjnbIe2k

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-hashtag-extractor-t3-1a9d6522 -d '<json body>'
```

Example prompt: Can you pull out the best hashtags from this caption I wrote for Instagram? Here it is: 'Just wrapped up an incredible sunrise hike through the Cascades — the views were unreal and my legs are officially done for the week.'

## When to prefer this

Choose this endpoint when you need to automatically generate or extract hashtags from a body of text for social media, content tagging, or SEO purposes. It is especially useful for agents handling content pipelines, social media scheduling, or marketing copy workflows where consistent and relevant tagging is needed at low cost per call.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected
- Empty or missing 'text' field — validation error
- Ambiguous or very short text may yield few or low-quality hashtags
- Payment failure via x402 protocol — 402 response before processing begins
- Network timeout on the Cloudflare Worker edge node

## How this service works

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

## Output

A JSON object containing an array or set of extracted and recommended hashtags derived from the input text, suitable for use on social media platforms or for content tagging purposes.

## 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-hashtag-extractor-t3-1a9d6522/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)