# ONE Engine Array Difference

> ONE Engine Array Difference is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0007/call, status unknown (last checked 2026-10-02).

Computes the difference between two arrays, returning elements present in the first array but not in the second.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/difference/t2?utm_source=zero.xyz
- Price: $0.0007/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-difference-661cb002
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N4cUaLiDSaQdpH5-cTGro

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-difference-661cb002 -d '<json body>'
```

Example prompt: Find all the elements in [1, 2, 3, 4, 5] that are NOT in [3, 4, 5, 6, 7] — I need the array difference between those two lists.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call set difference computation without spinning up local code, especially in autonomous agent pipelines running on Base that already use x402 micropayments. Ideal for quick one-off array diff operations on up to 1000 items where cost-per-call at $0.0007 USDC is acceptable. Prefer over custom code when the agent environment lacks a local runtime or when consistency and stateless execution are priorities.

## Known failure modes

- Input array exceeds 1000 items — request rejected with validation error
- Missing required `values` field — returns 400-level error
- Payment not provided or insufficient — returns HTTP 402 requiring x402 USDC payment on Base
- Malformed JSON array input — parse error returned
- Network timeout on Cloudflare Workers edge — intermittent 5xx error

## 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 array of elements that are present in the primary `values` array but absent from the `other` comparison array, effectively the set difference A minus B. May include metadata about the result size or offset if those parameters were provided.

## 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-difference-661cb002/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)