# ONE Engine Array Unique Filter

> ONE Engine Array Unique Filter is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns only the unique elements from a JSON array, optionally comparing against a second array or paginating results.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/unique/t8?utm_source=zero.xyz
- Price: $0.01/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-unique-filter-1141d8f8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9qDfTo8pcbYJJZgLU9WiY

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-unique-filter-1141d8f8 -d '<json body>'
```

Example prompt: I have a list of up to 1000 items with duplicates — can you deduplicate it and return only the unique values? Here's my array: ["apple", "banana", "apple", "cherry", "banana"].

## When to prefer this

Use this endpoint when you need a low-cost, pay-per-call deduplication or set-difference operation on a JSON array of up to 1000 items, especially in autonomous agent workflows where you want to avoid running your own dedup logic or spinning up infrastructure. It is well-suited for lightweight array utility tasks billed per call via x402 on Base, making it economical for sporadic agent use cases without subscription overhead.

## Known failure modes

- Input array exceeds 1000 items — request rejected
- Malformed JSON array in 'values' field — validation error
- Payment not included or insufficient — HTTP 402 response requiring x402 USDC payment on Base
- Empty array input returns empty unique result
- Network timeout on Cloudflare Workers edge

## How this service works

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

## Output

A JSON object containing the filtered array of unique values extracted from the input, with duplicates removed. When a comparison array is provided, returns elements unique relative to that second array. Pagination via offset and size parameters allows retrieving subsets of the unique result set.

## 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-unique-filter-1141d8f8/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)