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

Returns only the unique (deduplicated) elements from a JSON array, with optional offset, size, and comparison array support.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/unique/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-unique-filter-b38b058b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6F2Ol7tdED9WmYu4QD8Zz

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-b38b058b -d '<json body>'
```

Example prompt: I have this list of product IDs with duplicates — can you deduplicate it and return only the unique ones? The array is [101, 202, 101, 303, 202, 404] and I only need the first 3 unique results.

## When to prefer this

Choose this endpoint when you need a fast, cheap, serverless deduplication of a JSON array (up to 1000 items) without standing up your own compute — especially useful in autonomous agent pipelines on Base where x402 micropayments are already supported. Prefer it over custom code when you want a stateless, pay-per-call utility that integrates seamlessly into agentic workflows.

## Known failure modes

- Array exceeds 1000 item limit — request rejected
- Malformed JSON array in values field — validation error
- Payment failure via x402 — 402 response, call not processed
- Missing required 'values' field — schema validation error
- Non-array value passed as 'values' — type error

## How this service works

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

## Output

A JSON object containing the deduplicated array of unique elements extracted from the input values array, optionally filtered by offset and limited by size, with optional comparison 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-unique-filter-b38b058b/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)