# 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, $0.0025/call, status unknown (last checked 2026-10-02).

Returns an even-indexed sample of elements from a provided array, with optional size, offset, and comparison array parameters.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/even-sample/t5?utm_source=zero.xyz
- Price: $0.0025/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-1905792a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UUPPs9fTAYlIxlHFoGVlT

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-1905792a -d '<json body>'
```

Example prompt: Take this list of 200 values and give me an even-indexed sample of 50 elements starting at offset 2: [1, 2, 3, 4, 5, ...]

## When to prefer this

Use this endpoint when you need a quick, cheap, pay-per-call way to extract even-indexed elements from an array of up to 1000 items, especially within an autonomous agent workflow on Base using x402 micropayments. Prefer it over rolling your own logic when you need a hosted, stateless utility with no setup cost.

## Known failure modes

- Input array exceeds 1000 items — request rejected
- Missing required 'values' field returns a validation error
- Invalid types for size or offset (non-integer) cause a 400 error
- Empty array input may return an empty result
- Payment failure via x402 protocol returns a 402 response

## How this service works

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

## Output

A JSON object containing the even-indexed (or even-sampled) subset of the input array, filtered by size and offset parameters if provided, and optionally compared against a second array.

## 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-1905792a/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)