# ONE Engine Array Frequency Top-10

> ONE Engine Array Frequency Top-10 is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-02).

Returns the top-10 most frequent values in a JSON array, with optional offset and comparison against a second array.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/frequency/t10?utm_source=zero.xyz
- Price: $0.03/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-top-10-fe665a85
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1a-zluAbvOAZdMhjIMjiB

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-top-10-fe665a85 -d '<json body>'
```

Example prompt: Find the top 10 most frequent values in this list: ['apple','banana','apple','cherry','banana','apple','grape','cherry','banana','apple'] — show me which items appear most often.

## When to prefer this

Use this endpoint when you need a fast, cheap ($0.03 USDC), serverless frequency analysis on an array of up to 1000 items and want ranked top-N results without running local code. Ideal for AI agents that need on-demand statistical summaries without provisioning compute infrastructure.

## Known failure modes

- Array exceeds 1000 items — request rejected
- Missing required 'values' field — 400 error
- Non-array value passed for 'values' — schema validation failure
- Empty array returns empty result set
- Payment failure via x402 — 402 response before computation

## How this service works

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

## Output

Returns a JSON object containing the top-10 (or top-N if size is specified) most frequent values from the input array, their occurrence counts, ranked in descending order of frequency, with optional offset for pagination and optional comparison data 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-array-frequency-top-10-fe665a85/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)