# ONE Engine Numeric Percent Change (T2)

> ONE Engine Numeric Percent Change (T2) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0007/call, status unknown (last checked 2026-10-02).

Computes percent-change values for an array of numbers, with optional scaling, clamping, and rounding controls.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/numeric/percent-change/t2?utm_source=zero.xyz
- Price: $0.0007/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-numeric-percent-change-t2-2f6ec1bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mVyj3JAxJ03ts8eSZxEZU

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-numeric-percent-change-t2-2f6ec1bf -d '<json body>'
```

Example prompt: Calculate the percent change for these values [100, 110, 95, 130, 120] and round the results to 2 decimal places.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call computation of percent changes on a numeric array without spinning up your own math infrastructure. Ideal for agents needing on-demand numerical transformation at fractions of a cent, especially in x402/Base payment workflows. Prefer this over general-purpose math libraries when you want a hosted, no-setup solution with optional clamping, scaling, and rounding in one call.

## Known failure modes

- Input array contains non-finite numbers (Infinity, NaN) — rejected with validation error
- Array exceeds 1000 elements — request refused
- Missing required 'values' field — 400-level error
- Payment not included or insufficient — 402 Payment Required response
- Division by zero when a base value is 0 — may produce Infinity 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 computed percent-change values derived from the input array, potentially scaled, offset, clamped between min/max, resized to a specified count, and rounded to a given number of decimal digits.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "values"
 ],
 "properties": {
  "max": {
   "type": "number"
  },
  "min": {
   "type": "number"
  },
  "size": {
   "type": "integer"
  },
  "digits": {
   "type": "integer"
  },
  "factor": {
   "type": "number"
  },
  "offset": {
   "type": "number"
  },
  "values": {
   "type": "array",
   "description": "Finite numbers, maximum 1000"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "additionalProperties": true
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-numeric-percent-change-t2-2f6ec1bf/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)