# ONE Engine Array Stats Pack (Tier 2)

> ONE Engine Array Stats Pack (Tier 2) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0009/call, status unknown (last checked 2026-10-02).

Computes statistical metrics over an array of numeric values at Tier 2 depth, returning a richer stats pack than Tier 1.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v2/array-stats-pack/t2?utm_source=zero.xyz
- Price: $0.0009/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-stats-pack-tier-2-926fade3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8vQ7_nKii3z31NuAtdS7E

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-stats-pack-tier-2-926fade3 -d '<json body>'
```

Example prompt: Can you run the Tier 2 array stats pack on this list of values — [12, 45, 7, 89, 34, 56, 23, 78, 90, 11] — and give me the full statistical breakdown?

## When to prefer this

Choose this endpoint when you need a richer statistical summary than Tier 1 offers and your numeric dataset is already in array form. It is ideal for quick one-shot descriptive statistics on a batch of numbers without standing up your own compute. The per-call micropayment model makes it cost-effective for occasional or agent-driven use rather than high-frequency streaming analytics.

## Known failure modes

- Empty or missing values array returns error or empty result
- Non-numeric values in the array may cause computation failure or be silently ignored
- Payment failure via x402 returns 402 status blocking access
- Malformed JSON body returns 400 bad request
- Very large arrays may time out on Cloudflare Workers edge

## How this service works

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

## Output

Returns a JSON object with tier field (value: 2) and a result field containing Tier 2 statistical outputs — likely including mean, median, mode, variance, standard deviation, min, max, range, and possibly skewness or other higher-order descriptive statistics computed over the input array.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "values": {
   "type": "array"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tier": 2,
  "result": "Tier-dependent output"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-array-stats-pack-tier-2-926fade3/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)