# ONE Engine Array Set Pack (Tier 9)

> ONE Engine Array Set Pack (Tier 9) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Packs two input arrays into a set-based structure using tier-9 processing, returning a tier-dependent combined result.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v2/array-set-pack/t9?utm_source=zero.xyz
- Price: $0.01/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-set-pack-tier-9-b5a5b116
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SUqlUpWImGHgHUF4OPI_U

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-set-pack-tier-9-b5a5b116 -d '<json body>'
```

Example prompt: Pack these two arrays into a set for me — array A is [1, 2, 3, 4] and array B is [3, 4, 5, 6].

## When to prefer this

Choose this endpoint when you need a low-cost ($0.01 USDC), pay-per-call set-packing operation on two arrays within an autonomous agent pipeline running on Base/x402. Ideal for agentic workflows that need lightweight, on-demand array set operations without standing up custom infrastructure. Prefer this over general-purpose code execution when you want a metered, trustless utility call with crypto micropayment settlement.

## Known failure modes

- Missing or non-array inputs for 'a' or 'b' fields returns a validation error
- Payment failure via x402 on Base results in a 402 response blocking execution
- Empty arrays may return an empty or trivial result depending on tier logic
- Malformed JSON body returns a 400 bad request error
- Network or worker timeout may return a 5xx error on the Cloudflare edge

## How this service works

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

## Output

A JSON object containing a tier field (value: 9) and a result field with the tier-9-processed packed set output derived from combining arrays A and B.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "a": {
   "type": "array"
  },
  "b": {
   "type": "array"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tier": 9,
  "result": "Tier-dependent output"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-array-set-pack-tier-9-b5a5b116/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)