# ONE Engine Hashtag Extractor (T5)

> ONE Engine Hashtag Extractor (T5) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-02).

Extracts relevant hashtags from a block of text using a T5-based model, returning suggested hashtags for content tagging or social media use.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-token/hashtags/t5?utm_source=zero.xyz
- Price: $0.0025/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-t5-09c1ac01
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u3PiwvLVlE4iznroL7-3i

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-t5-09c1ac01 -d '<json body>'
```

Example prompt: Can you pull out the best hashtags from this blog post I'm about to share? Here's the full text: 'Artificial intelligence is transforming the way businesses operate, from automating routine tasks to enabling smarter decision-making across industries...'

## When to prefer this

Choose this endpoint when you need fast, low-cost automated hashtag extraction from arbitrary text at $0.0025 per call, especially in agentic workflows on Base/x402 where micropayment-per-call billing is preferred. Ideal for content pipelines, social media schedulers, or publishing agents that need to auto-tag posts at scale without a subscription model.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected or truncated
- Empty or whitespace-only text input — may return empty hashtag list or error
- Ambiguous or too-short text — T5 model may return generic or low-quality hashtags
- Network or worker timeout on Cloudflare edge — transient 5xx error
- Payment failure via x402/Base — 402 response if USDC balance is insufficient

## How this service works

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

## Output

Returns a JSON object containing suggested hashtags derived from the input text, likely as an array of hashtag strings (e.g. '#AI', '#MachineLearning') or a structured object with tags and possibly relevance metadata. The exact schema is open (additionalProperties: true).

## 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-t5-09c1ac01/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)