# ONE Engine Unicode Character Counter (Tier 3)

> ONE Engine Unicode Character Counter (Tier 3) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0008/call, status unknown (last checked 2026-10-13).

Counts Unicode characters in submitted text with Tier 3 progressively richer diagnostics, going beyond basic counts to include additional analysis metrics.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v5/text-metric/characters/t3?utm_source=zero.xyz
- Price: $0.0008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-unicode-character-counter-tier-3-96c340d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_460JWJjVhC_vsk0sMYZEj

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-character-counter-tier-3-96c340d0 -d '<json body>'
```

Example prompt: Count the Unicode characters in this text for me and give me the detailed Tier 3 diagnostics: '日本語テキストと English mixed content — こんにちは！'

## When to prefer this

Choose this endpoint when you need more than a raw character count — specifically when Tier 3 diagnostic depth is required, such as when building text validation pipelines, localization tools, or analytics that need richer Unicode-aware metrics. Prefer over a basic character counter when your use case involves multilingual, emoji-heavy, or CJK text where byte length and character count diverge significantly.

## Known failure modes

- Empty or missing text body returns error
- Extremely large payloads may be rejected or timeout
- Payment failure via x402 protocol returns 402 status
- Malformed request body returns 400 error
- Network timeout on workers.dev edge node

## How this service works

Text measurement and analysis utility: Count Unicode characters. Tier 3/10 adds progressively richer diagnostics.

## Output

Returns the Unicode character count of the submitted text along with Tier 3 progressive diagnostics — richer than basic counts, including additional statistical breakdowns and analysis metrics about the character composition and text length.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-unicode-character-counter-tier-3-96c340d0/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)