# 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, $0.0065/call, status unknown (last checked 2026-10-02).

Computes frequency counts and distributions for elements in a JSON array, with optional comparison to a second array.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/frequency/t7?utm_source=zero.xyz
- Price: $0.0065/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-06a367a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5sGw8uAiwjEtfPWfq3H96

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-06a367a0 -d '<json body>'
```

Example prompt: Can you analyze the frequency of each value in this array and tell me how many times each element appears? Here's my list: ["apple","banana","apple","cherry","banana","apple","date","cherry"].

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call frequency/tally computation on a JSON array without standing up your own infrastructure. It is particularly useful for AI agents that need on-demand statistical summaries of discrete value lists (e.g. survey responses, log entries, categorical data) at very low cost ($0.0065 per call) via x402 micropayments on Base.

## Known failure modes

- Array exceeds 1000 item limit — request rejected with validation error
- Malformed JSON array input — returns parse error
- Payment failure via x402 — HTTP 402 returned before processing
- Empty values array — may return empty frequency map
- Non-homogeneous array types may produce unexpected groupings

## 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, along with distribution statistics. When a comparison array is provided, includes comparative frequency data between both arrays.

## 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-06a367a0/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)