# ONE Engine Numeric Percent Change Calculator

> ONE Engine Numeric Percent Change Calculator is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.018/call, status unknown (last checked 2026-10-02).

Computes percent change values for an array of numbers, with optional scaling, offset, and range constraints.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/numeric/percent-change/t9?utm_source=zero.xyz
- Price: $0.018/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-calculator-6c83026c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dK6-CMm8EfOZs580IwaKP

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-calculator-6c83026c -d '<json body>'
```

Example prompt: Calculate the percent change for this list of values [100, 120, 90, 150, 130], round results to 2 decimal places, and clamp them between -50 and 50.

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call percent change computation with built-in options for scaling, offsetting, and range clamping — especially in autonomous agent workflows on Base where x402 micropayments are already in use. Prefer it over rolling your own computation when you want a single API call to handle rounding and constraint logic in one step.

## Known failure modes

- Input array exceeds 1000 elements — request rejected
- Non-finite numbers (NaN, Infinity) in values array cause validation error
- Missing required 'values' field returns 400 error
- Division by zero when computing percent change from a zero baseline
- Payment not provided or insufficient USDC causes 402 Payment Required response

## How this service works

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

## Output

A JSON object containing the computed percent change results for the input array, potentially scaled by factor, shifted by offset, clamped to min/max bounds, and rounded to the specified 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-calculator-6c83026c/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)