# ONE Engine Array Flatten (t5)

> ONE Engine Array Flatten (t5) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-02).

Flattens a nested JSON array into a single-level array via a pay-per-call API using x402 on Base.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/flatten/t5?utm_source=zero.xyz
- Price: $0.0025/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-t5-cc746a1d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CIDaYCfNh8MCOh7DBHWDY

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-t5-cc746a1d -d '<json body>'
```

Example prompt: Can you flatten this nested JSON array for me? Here it is: [[1, 2], [3, [4, 5]], 6] — just collapse all the nesting into a single flat list.

## When to prefer this

Choose this endpoint when you need a lightweight, low-cost, pay-per-call array flattening operation without spinning up your own compute, especially within autonomous agent workflows on Base using x402 micropayments. Ideal for agents that handle small-to-medium JSON arrays (up to 1000 items) and need a simple, reliable transformation without managing infrastructure.

## Known failure modes

- Input array exceeds 1000 items — request rejected with error
- Malformed or non-array values input — schema validation error
- Payment failure via x402 — 402 Payment Required returned
- Missing required 'values' field — 400 Bad Request
- Network timeout on Cloudflare Worker edge — 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 flattened version of the input array, with all nested sub-arrays collapsed into a single-level array. Additional metadata may be included depending on optional parameters like size and offset.

## 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-t5-cc746a1d/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)