# ONE Engine Array Frequency (T1)

> ONE Engine Array Frequency (T1) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0005/call, status unknown (last checked 2026-10-02).

Computes the frequency distribution of elements in a JSON array, with optional comparison against a second array.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/frequency/t1?utm_source=zero.xyz
- Price: $0.0005/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-t1-5899b6ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oRlohKhZa1ut4ymCxxcId

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-t1-5899b6ef -d '<json body>'
```

Example prompt: Count how often each value appears in this list: ["apple","banana","apple","cherry","banana","apple"] — give me the frequency distribution.

## When to prefer this

Choose this endpoint when you need a quick, cheap, pay-per-call frequency count or value distribution on an array of up to 1000 items, especially in autonomous agent workflows on Base using x402 micropayments. Ideal for lightweight statistical summarization without setting up a full data processing pipeline.

## Known failure modes

- Array exceeds 1000 items — request rejected
- Malformed or non-array values input — validation error
- Empty array input — may return empty or zero-count result
- Payment failure via x402 — 402 response before computation
- Network timeout on large array processing

## How this service works

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

## Output

An object containing frequency counts for each unique value found in the input array, showing how many times each element appears. When a comparison array is provided, the result may include frequency data for both arrays for side-by-side analysis.

## 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-t1-5899b6ef/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)