# ONE Engine Array Head – First 3 Items (Tier 10)

> ONE Engine Array Head – First 3 Items (Tier 10) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-14).

Returns the first 3 elements of a submitted array, with Tier 10 richer diagnostic metadata included in the response.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v6/array-head/items-3/t10?utm_source=zero.xyz
- Price: $0.007/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-array-head-first-3-items-tier-10-8e7bb444
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DP4enGjeHV5X1ezIAQ75C

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-array-head-first-3-items-tier-10-8e7bb444 -d '<json body>'
```

Example prompt: I have a JSON array and I need just the first 3 items from it — can you slice it down to those three elements and include the full diagnostic breakdown in the response?

## When to prefer this

Choose this endpoint when you need a fast, cheap, deterministic head-slice of exactly 3 items from a JSON array and want the richest available diagnostic output (Tier 10). Prefer it over manual slicing in agent code when auditability, diagnostic tracing, or pay-per-call metering on Base via x402 is desired.

## Known failure modes

- Empty array input returns empty result or an error indicating nothing to slice
- Non-array body causes a 400-level parse error
- Array with fewer than 3 items returns all available items (or an error depending on strict mode)
- Malformed JSON body results in a parsing failure
- Payment not provided or insufficient causes a 402 Payment Required response

## How this service works

Return first 3 array items. Tier 10/10 adds richer diagnostics.

## Output

A JSON response containing a sliced array of the first 3 elements from the input array, plus Tier 10 diagnostic metadata such as input length, slice bounds, processing tier, and any enriched debug information about the operation.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-array-head-first-3-items-tier-10-8e7bb444/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)