# NFKC Text Normalization

> NFKC Text Normalization is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Normalizes Unicode text using NFKC (Compatibility Decomposition followed by Canonical Composition) with no network or LLM involvement

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/norm-nfkc?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nfkc-text-normalization-e68325e7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n1cQilSq-8EOZEr9gCSEL

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 nfkc-text-normalization-e68325e7 -d '<json body>'
```

Example prompt: Can you NFKC-normalize this text for me: 'Ａｅｓｔｈｅｔｉｃ file ½ cаfé'? I need the canonically composed unicode form with compatibility characters resolved.

## When to prefer this

Prefer this endpoint when you need deterministic, offline NFKC Unicode normalization without any LLM or external network calls. It is ideal for preprocessing pipelines that require consistent string representation before indexing, comparison, or storage. Use the unpaid sandbox endpoint POST /v1/sandbox/norm-nfkc first for testing before paying $0.01 USDC per call on this production endpoint.

## Known failure modes

- Empty or missing 'text' field returns a validation error
- Input exceeding 100,000 characters is rejected
- Payment of exactly $0.01 USDC is required; incorrect payment amount causes 402 rejection
- Network or server errors may result in 5xx responses

## How this service works

Call when an agent needs text normalized with nfkc. No network and no LLM. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/norm-nfkc first.

## Output

Returns the NFKC-normalized version of the input text string, where compatibility characters are decomposed and then canonically recomposed — for example fullwidth ASCII becomes regular ASCII, ligatures are split into component letters, and fractions like ½ become '1/2'.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "examples": [
    "Hello, World!"
   ],
   "maxLength": 100000,
   "minLength": 1,
   "description": "Input for this SKU. The route description says whether it is plain text, a URL, base64 bytes, or an already-encoded token."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nfkc-text-normalization-e68325e7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)