# ONE Engine Deterministic Tail-Words Text Segmentation (p48, Tier 10)

> ONE Engine Deterministic Tail-Words Text Segmentation (p48, Tier 10) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0109/call, status unknown (last checked 2026-10-12).

Extracts the last 48 words from a given text input, returning them with the richest available diagnostic metadata at Tier 10.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v11/text-segment/tail-words/p9/t10?utm_source=zero.xyz
- Price: $0.0109/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-deterministic-tail-words-text-segmentation-p48-tier-10-e41bd11a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GUdn4yfvEtpYXZAmfvczF

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-tail-words-text-segmentation-p48-tier-10-e41bd11a -d '<json body>'
```

Example prompt: Take this article excerpt and return the last 48 words from it, with full Tier 10 diagnostics: [paste text here].

## When to prefer this

Choose this endpoint when you need a deterministic, reproducible extraction of the trailing 48 words from a text string and want the maximum available diagnostic context (Tier 10). It is ideal for text pipeline validation, tail-segment inspection, and automated agents that need consistent, low-cost word-boundary segmentation without generative or probabilistic behavior.

## Known failure modes

- Text input is empty or missing — returns error indicating no content to segment
- Input text has fewer than 48 words — may return all available words or an error depending on implementation
- Malformed POST body or missing required fields — returns 400-level error
- Payment not included or insufficient — returns HTTP 402 Payment Required
- Rate limiting or server-side worker errors — returns 5xx response

## How this service works

Deterministic text segmentation utility: Return last words; parameter=48. Tier 10/10 provides progressively richer diagnostics.

## Output

Returns the last 48 words of the submitted text as a deterministic segment, accompanied by Tier 10 diagnostic metadata which includes the richest available processing details such as word counts, offsets, segmentation boundaries, and validation signals.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-deterministic-tail-words-text-segmentation-p48-tier-10-e41bd11a/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)