# ONE Engine Stable Sort (T5) – Array Utility API

> ONE Engine Stable Sort (T5) – Array Utility API 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).

Performs a stable sort on a JSON array of up to 1000 items, optionally using a comparison array, with configurable size and offset parameters.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/stable-sort/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-stable-sort-t5-array-utility-api-79111263
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7gz93pb4xbm_jMv2O0Tn4

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-stable-sort-t5-array-utility-api-79111263 -d '<json body>'
```

Example prompt: Can you stably sort this array of values for me: [3, 1, 4, 1, 5, 9, 2, 6] — and use ["a","b","c","d","e","f","g","h"] as the comparison array to break ties?

## When to prefer this

Choose this endpoint when you need a guaranteed stable sort (preserving relative order of equal elements) on a JSON array of up to 1000 items, especially inside an autonomous agent workflow that can pay micro-fees via x402 on Base. Prefer over client-side sorting when computation must be offloaded, auditable, or paid-for as a utility step in a larger pipeline.

## Known failure modes

- Array exceeds 1000-item limit — request rejected
- Invalid JSON array in 'values' field — parse error
- Payment failure via x402 on Base — 402 response, no computation performed
- Missing required 'values' field — validation error
- 'other' comparison array length mismatch — undefined behavior or 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 stably sorted version of the input array. Equal elements maintain their original relative order. The response reflects any size and offset constraints applied to the result.

## 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-stable-sort-t5-array-utility-api-79111263/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)