# ONE Engine Array Flatten (Top 10)

> ONE Engine Array Flatten (Top 10) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-02).

Flattens a nested JSON array and returns the top 10 results, with optional comparison array and offset support.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/flatten/t10?utm_source=zero.xyz
- Price: $0.03/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-flatten-top-10-2690e8ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jh1HyK8cY6MoCR7zkwIG2

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-flatten-top-10-2690e8ef -d '<json body>'
```

Example prompt: Can you flatten this nested JSON array for me and give me the top 10 items? Here's the data: [[1, [2, 3]], [4, [5, [6]]], 7, 8, 9, 10, 11, 12].

## When to prefer this

Use this endpoint when an AI agent needs a quick, cheap, pay-per-call utility to flatten nested JSON arrays and retrieve the top 10 results, especially when operating on Base with x402 micropayments. Prefer this over rolling custom code when the agent needs a reliable, stateless transformation without infrastructure overhead.

## Known failure modes

- Input array exceeds 1000 items — request rejected
- Malformed or non-array 'values' field — validation error
- Payment not provided or insufficient USDC via x402 — 402 response
- Offset beyond array length returns empty or partial results
- Deeply recursive structures may hit processing limits

## 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 flattened version of the input nested array, limited to the top 10 items (with optional offset for pagination), and optionally compared against a provided reference 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-flatten-top-10-2690e8ef/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)