# ONE Engine Unicode NFKC Normalization (T5)

> ONE Engine Unicode NFKC Normalization (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).

Normalizes input text to Unicode NFKC form using the T5 model, resolving compatibility characters and canonicalizing encoding.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/text-normalize/unicode-nfkc/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-unicode-nfkc-normalization-t5-1f66d3c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_moleyjM7QFc_CuN72-KyD

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-unicode-nfkc-normalization-t5-1f66d3c2 -d '<json body>'
```

Example prompt: Please normalize this text to NFKC unicode form — it has mixed compatibility characters and ligatures that need to be canonicalized before I run NLP on it: 'Ａｂｃ file ½ ①'

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call NFKC unicode normalization without managing your own NLP infrastructure — especially useful for agents preprocessing text before embedding, search, or model inference. Prefer it over general-purpose NLP APIs when you specifically need unicode canonicalization at low cost ($0.0025/call) and want to pay per use via x402 on Base rather than maintain a subscription.

## Known failure modes

- Text exceeds 50000 character limit — request rejected
- Empty or missing 'text' field — validation error
- Payment not included or insufficient USDC — 402 Payment Required response
- Malformed JSON body — 400 Bad Request
- Service unavailable on Cloudflare Workers — 503 or timeout

## How this service works

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

## Output

Returns a JSON object containing the NFKC-normalized version of the input text, with compatibility characters decomposed and canonically recomposed, ligatures expanded, and encoding standardized.

## 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-unicode-nfkc-normalization-t5-1f66d3c2/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)