# ONE Engine Even Sample Endpoint

> ONE Engine Even Sample Endpoint is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0007/call, status unknown (last checked 2026-10-02).

Returns an evenly spaced sample of elements from an input array, with optional offset and size controls.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/even-sample/t2?utm_source=zero.xyz
- Price: $0.0007/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-endpoint-28d7fc85
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XJHlrf_269g7lLMzyxZ7Z

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-endpoint-28d7fc85 -d '<json body>'
```

Example prompt: I have a list of 500 sensor readings — can you evenly sample it down to 50 items, starting from the 10th element?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call utility to evenly downsample or subsample a JSON array up to 1000 elements. It is ideal for agents that need to thin out large datasets, reduce array size for downstream processing, or extract regularly spaced samples from sequential data without spinning up custom logic.

## Known failure modes

- Array exceeds 1000 items — request rejected with validation error
- Invalid or non-integer size/offset values — schema validation failure
- Empty values array — may return empty result or error
- Payment not included or insufficient — 402 Payment Required response
- Malformed JSON body — 400 Bad Request

## 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 the input array, with elements selected at regular intervals according to the requested size and offset parameters.

## 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-endpoint-28d7fc85/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)