# ONE Engine Deterministic Drop-Tail Unicode Characters (p=16, Tier 6)

> ONE Engine Deterministic Drop-Tail Unicode Characters (p=16, Tier 6) 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 2026-11-04).

Removes the last 16 Unicode characters from a text string, returning the trimmed result with Tier 6 diagnostic metadata.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v9/text-segment/drop-tail-chars/p6/t6?utm_source=zero.xyz
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-04
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-deterministic-drop-tail-unicode-characters-p-16-tier-6-fbe70ace
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Rq6GCokvPzKbFLpfJQtzH

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-drop-tail-unicode-characters-p-16-tier-6-fbe70ace -d '<json body>'
```

Example prompt: Strip the last 16 Unicode characters from this string: 'Hello, this is my sample text input with a trailing section!' and give me the trimmed result with diagnostics.

## When to prefer this

Choose this endpoint when you need deterministic, Unicode-safe removal of exactly 16 characters from the tail of a string and want Tier 6 diagnostic output for debugging or auditing. Prefer it over generic string slicing when you need reproducible, pay-per-call utility behavior in an autonomous agent pipeline using x402 payments on Base.

## Known failure modes

- Input text shorter than 16 characters may return an empty string or an error
- Missing or malformed request body returns a 400 error
- Payment not included or insufficient USDC results in a 402 Payment Required response
- Non-UTF-8 encoded input may produce unexpected Unicode boundary results
- Network timeout on the workers.dev edge may return a 5xx error

## How this service works

Deterministic text segmentation utility: Remove last Unicode characters; parameter=16. Tier 6/10 provides progressively richer diagnostics.

## Output

Returns the input text with the last 16 Unicode characters removed, along with Tier 6 diagnostic metadata that provides progressively richer segmentation context such as character counts, offsets, and processing details about the truncation operation.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-deterministic-drop-tail-unicode-characters-p-16-tier-6-fbe70ace/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)