# ONE Engine Array Frequency (T5)

> ONE Engine Array Frequency (T5) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0025/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 and configurable offset and size parameters.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/frequency/t5?utm_source=zero.xyz
- Price: $0.0025/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-t5-19e349be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GZNgV-SbklXJi3czQLy8t

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-t5-19e349be -d '<json body>'
```

Example prompt: Count how many times each value appears in this list: ["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 lightweight, pay-per-call frequency distribution computation on an array of up to 1000 items without standing up your own infrastructure. It is ideal for agents that occasionally need element counting or histogram generation as part of a larger workflow, and where the low per-call cost ($0.0025 USDC) makes it more economical than a full analytics service.

## Known failure modes

- Array exceeds 1000 items — request rejected
- Missing required 'values' field — validation error
- Non-array value passed for 'values' or 'other' — schema error
- Payment failure via x402 — 402 response before processing
- 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 a JSON object containing frequency counts for each unique element found in the input array. May include comparison data if a second array is provided, and respects size and offset for paginated or limited results.

## 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-t5-19e349be/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)