# ONE Engine Stable Sort Array

> ONE Engine Stable Sort Array is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).

Sorts a JSON array in stable order, optionally using a secondary comparison array, via a pay-per-call API on Base using x402.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/array/stable-sort/t6?utm_source=zero.xyz
- Price: $0.004/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-array-980781c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_U93vFeaKdUlHCyJigc1bN

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-array-980781c7 -d '<json body>'
```

Example prompt: Can you stable-sort this array of product scores for me: [42, 7, 99, 7, 3, 55]? I also have an optional comparison array ["a","b","c","d","e","f"] to use as a secondary sort key.

## When to prefer this

Choose this endpoint when you need a guaranteed stable sort (preserving original order of equal elements) on arrays up to 1000 items, especially when using a secondary comparison array. Prefer it for pay-per-call, serverless agent workflows on Base using x402 where you want minimal overhead and no subscription.

## Known failure modes

- Array exceeds 1000-item limit — request rejected
- Invalid or non-array value in 'values' field — validation error
- Payment failure via x402 — 402 Payment Required returned
- Malformed JSON input — 400 Bad Request
- Offset out of bounds for given array — unexpected or empty result

## How this service works

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

## Output

Returns an object containing the stably-sorted version of the input array, preserving the relative order of elements that compare as equal. May also include metadata about the sort operation.

## 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-array-980781c7/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)