# ONE Engine Array Frequency Analysis

> ONE Engine Array Frequency Analysis is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Computes element frequency counts for a JSON array, optionally comparing against a second array or applying offset/size windowing.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/frequency/t6?utm_source=zero.xyz
- Price: $0.004/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-array-frequency-analysis-ad66d3f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wdpv0SRfVUs0OKwpUYrvO

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-frequency-analysis-ad66d3f4 -d '<json body>'
```

Example prompt: Count how many times each value appears in this array: ["apple","banana","apple","cherry","banana","apple"] — give me a frequency breakdown for all items.

## When to prefer this

Use this endpoint when you need a quick, cheap ($0.004 per call) pay-per-use frequency count on a JSON array of up to 1000 elements, especially within an autonomous agent workflow on Base using x402 micropayments, without needing to spin up local computation or a heavier data pipeline.

## Known failure modes

- Array exceeds 1000 items — request rejected or truncated
- Invalid JSON array format in 'values' field returns an error
- Non-serializable array elements may cause parsing failures
- Payment not provided or insufficient USDC balance triggers 402 response
- Empty array input may return empty frequency map

## How this service works

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

## Output

Returns an object mapping each unique element in the input array to its occurrence count, optionally windowed by offset/size and compared against a second array's frequency distribution.

## 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-array-frequency-analysis-ad66d3f4/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)