# 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, $0.018/call, status unknown (last checked 2026-10-02).

Returns only the unique (deduplicated) elements from a JSON array, with optional comparison against a second array.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/unique/t9?utm_source=zero.xyz
- Price: $0.018/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-19905f25
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l03SOGWYzvEXRyxlzGF4d

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-19905f25 -d '<json body>'
```

Example prompt: Deduplicate this list of values for me — I have an array of up to 1000 items and need only the unique ones back: ["apple", "banana", "apple", "cherry", "banana"].

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call array deduplication operation without standing up your own infrastructure. Ideal for autonomous agents performing data-cleaning steps in a pipeline, especially when the input is already a JSON array and the cost of $0.018 USDC per call is acceptable. Prefer this over building custom deduplication logic when simplicity and low overhead matter. The optional comparison array makes it useful for set-difference operations, not just simple deduplication.

## Known failure modes

- Array exceeds 1000-item limit — request rejected
- Malformed or non-array values field — validation error
- Payment failure via x402 — 402 response before processing
- Empty array input — may return empty result
- Network timeout on Cloudflare Worker — transient 5xx error

## How this service works

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

## Output

An object containing the deduplicated array — only unique elements from the input values array are returned, with duplicates removed. If a comparison array is provided, uniqueness is evaluated relative to that second array. Supports pagination via size and offset parameters.

## 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-19905f25/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)