# ONE Engine Even Sample Array Utility

> ONE Engine Even Sample Array Utility is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns an evenly spaced sample of elements from a JSON array, optionally offset and sized, with optional comparison against another array.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/even-sample/t8?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-even-sample-array-utility-a8b71140
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_etxf-jh_7uJ6eJfdvPMOw

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-even-sample-array-utility-a8b71140 -d '<json body>'
```

Example prompt: I have a list of 500 sensor readings and I need an evenly spaced sample of 20 values from it — can you pull that sample starting at offset 5?

## When to prefer this

Choose this endpoint when you need a deterministic, evenly spaced subsample of an array (e.g. for charting, downsampling, or representative previews) and want a pay-per-call model with no subscription. Prefer it over manual slicing logic when you also want optional side-by-side comparison with a second array.

## Known failure modes

- Input array exceeds 1000 items — request rejected
- Invalid or missing 'values' field — validation error
- Size or offset parameters out of range — unexpected or empty result
- Malformed JSON array input — parse error
- Payment failure via x402 — 402 response, no result returned

## How this service works

Low-cost pay-per-call utility APIs for autonomous agents using x402 on Base.

## Output

A JSON object containing the evenly sampled subset of elements drawn from the input array, respecting the requested size and offset, with optional comparison results if a second array was provided.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "values"
 ],
 "properties": {
  "size": {
   "type": "integer"
  },
  "other": {
   "type": "array",
   "description": "Optional comparison array"
  },
  "offset": {
   "type": "integer"
  },
  "values": {
   "type": "array",
   "description": "JSON array with at most 1000 items"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-even-sample-array-utility-a8b71140/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)