# ONE Engine Drop-Last Array Items Utility (Tier 10)

> ONE Engine Drop-Last Array Items Utility (Tier 10) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0114/call, status unknown (last checked 2026-10-13).

Drops the last 64 items from a JSON array and returns the truncated result with richest-tier diagnostics.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v9/array-process/drop-tail/p10/t10?utm_source=zero.xyz
- Price: $0.0114/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-drop-last-array-items-utility-tier-10-2c5e0e06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__blIsxMAVqT780gqSSLY6

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-drop-last-array-items-utility-tier-10-2c5e0e06 -d '<json body>'
```

Example prompt: Take this JSON array and drop the last 64 items from it, giving me the truncated result with full diagnostics.

## When to prefer this

Choose this endpoint when you need a deterministic, auditable drop of the last 64 elements from a JSON array and want the richest available diagnostic output (Tier 10). Prefer it over lower-tier siblings when you need maximum processing insight. Use it when a fixed tail-drop of exactly 64 items matches your use case and you are operating in an x402-payment agent context on Base.

## Known failure modes

- Array shorter than 64 items may return empty array or error
- Invalid JSON input returns a parse error
- Non-array JSON input rejected
- Payment failure via x402 results in 402 response and no processing
- Network timeout on large arrays

## How this service works

Deterministic JSON array processing utility: Drop last array items; parameter=64. Tier 10/10 provides progressively richer diagnostics.

## Output

Returns the input JSON array with the last 64 elements removed, along with Tier 10 richest-level diagnostic output including processing metadata such as original length, resulting length, items dropped, and any relevant processing signals.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-drop-last-array-items-utility-tier-10-2c5e0e06/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)