# ONE Engine Deterministic Text Segmentation – First Unicode Characters (Param=1, Tier 3)

> ONE Engine Deterministic Text Segmentation – First Unicode Characters (Param=1, 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 2026-10-14).

Extracts the first Unicode character(s) from a text input using a deterministic segmentation algorithm, returning progressively richer diagnostics at Tier 3 of 10.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v8/text-segment/head-chars/p1/t3?utm_source=zero.xyz
- Price: $0.0008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-deterministic-text-segmentation-first-unicode-characters-9ec361d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ROrZM79WHxx9WD5W8Hgqt

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-deterministic-text-segmentation-first-unicode-characters-9ec361d3 -d '<json body>'
```

Example prompt: I need you to extract just the first Unicode character from the string 'Hello, 世界!' and give me the diagnostic breakdown — use the deterministic text segmentation utility at parameter 1 with tier 3 diagnostics.

## When to prefer this

Choose this endpoint when you need a cheap, deterministic, reproducible extraction of the first Unicode character from a string with moderate diagnostic output (Tier 3). Ideal for pipelines that need to inspect or validate the leading character of user input, especially with multilingual or non-ASCII text, and when you want more than minimal diagnostics but don't need the full Tier 10 output.

## Known failure modes

- Empty string input may return empty result or error
- Non-UTF-8 encoded input may cause parsing failures
- Malformed or null body returns 400-level error
- Payment failure via x402 returns 402 Payment Required
- Very long inputs may be truncated or time out

## How this service works

Deterministic text segmentation utility: Return first Unicode characters; parameter=1. Tier 3/10 provides progressively richer diagnostics.

## Output

Returns the first Unicode character(s) extracted from the input text (based on parameter=1), along with Tier 3 diagnostic metadata that provides richer segmentation details than lower tiers, such as character code points, byte offsets, and segmentation boundary information.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-deterministic-text-segmentation-first-unicode-characters-9ec361d3/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)