# ONE Engine Hashtag Extractor (T9)

> ONE Engine Hashtag Extractor (T9) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.018/call, status unknown (last checked 2026-10-02).

Extracts hashtags from a given text string using T9-style processing, returning all identified hashtag tokens.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-extract/hashtags/t9?utm_source=zero.xyz
- Price: $0.018/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-t9-889af70a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k0tO4HHkqZ-uspSq6yqZE

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-t9-889af70a -d '<json body>'
```

Example prompt: Can you pull out all the hashtags from this Instagram caption for me: 'Loving the golden hour vibes today! #sunset #photography #goldenhour #nature #travel'?

## When to prefer this

Choose this endpoint when you need a cheap, low-latency, pay-per-call hashtag extraction from raw text without setting up a full NLP pipeline. It is ideal for agents processing social media content, user-generated text, or scraped posts where hashtag identification is a discrete step. At $0.018 USDC per call via x402 on Base, it suits high-volume agentic workflows where cost predictability matters and no subscription or API key management is desired.

## Known failure modes

- Text exceeds 50,000 character limit — request rejected with validation error
- Empty or missing 'text' field — returns error due to required field constraint
- Text with no hashtags — returns empty hashtag list
- Payment not attached or insufficient USDC — x402 payment required error
- Malformed JSON body — request parsing error

## How this service works

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

## Output

Returns a structured object containing the list of hashtags found in the submitted text. Each hashtag is identified as it appears in the input (including the # symbol), enabling downstream aggregation, deduplication, or trend analysis.

## 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-t9-889af70a/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)