# ONE Engine Array Set Pack (Tier 8)

> ONE Engine Array Set Pack (Tier 8) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0075/call, status unknown (last checked 2026-10-02).

Packs and processes two input arrays using a tier-8 set operation, returning a tier-dependent result for autonomous agent workflows.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v2/array-set-pack/t8?utm_source=zero.xyz
- Price: $0.0075/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-8-2a51116f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tmmAofPF1S_xomDK-3lQC

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-8-2a51116f -d '<json body>'
```

Example prompt: Pack these two arrays together using the ONE Engine set-pack utility: array A is [1, 2, 3] and array B is [3, 4, 5].

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call array set-pack computation without provisioning infrastructure, especially in autonomous agent workflows on Base using x402 micropayments. Ideal when you need a quick, deterministic tier-8 transformation of two arrays at very low cost ($0.0075 USDC).

## Known failure modes

- Missing or malformed 'a' or 'b' array fields returns an error response
- Payment failure via x402 on Base results in a 402 Payment Required response
- Empty arrays may return a trivial or empty packed result
- Non-array types passed as 'a' or 'b' may cause a schema validation error
- Cloudflare Worker timeout on very large arrays

## 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 8, indicating the processing tier used) and a 'result' field with the tier-dependent packed output derived from the two input arrays.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tier": 8,
  "result": "Tier-dependent output"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-array-set-pack-tier-8-2a51116f/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)