# ONE Engine Array Reverse (T9)

> ONE Engine Array Reverse (T9) 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).

Reverses a JSON array of up to 1000 items, optionally with offset and comparison array support, via a pay-per-call x402 API.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/reverse/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-reverse-t9-15108080
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WPUalP_19-AAUAgffnpY_

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-reverse-t9-15108080 -d '<json body>'
```

Example prompt: Reverse this array of values for me: [5, 12, 3, 99, 7, 1] — return them in the opposite order using the ONE Engine array reverse utility.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call array reversal utility within an autonomous agent pipeline on Base using x402 micropayments. It is ideal for agentic workflows that need deterministic data transformation without spinning up custom compute, and works well for arrays up to 1000 items. Prefer over custom code execution when minimizing agent complexity or when operating in a serverless, payment-gated microservice architecture.

## Known failure modes

- Array exceeds 1000-item limit — request rejected
- Invalid or non-array 'values' field — schema validation error
- Payment failure via x402 — 402 response returned before processing
- Empty array input — may return empty result or error
- Network timeout on Cloudflare Worker — retry advised

## How this service works

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

## Output

A JSON object containing the input array reversed in order, returned after a successful x402 micropayment. The response may also include metadata about the transformed array such as size or offset details.

## 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-reverse-t9-15108080/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)