# ONE Engine Percent Change (T3)

> ONE Engine Percent Change (T3) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).

Computes percent change between consecutive numeric values in an array, with optional scaling, offsetting, and output constraints.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/numeric/percent-change/t3?utm_source=zero.xyz
- Price: $0.001/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-percent-change-t3-da147827
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cS-wntRIbf2tEOTyzcwfQ

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-percent-change-t3-da147827 -d '<json body>'
```

Example prompt: Calculate the percent change between each consecutive pair in this list of values: [100, 110, 99, 121, 108.9], rounded to 2 decimal digits.

## When to prefer this

Choose this endpoint when you need a cheap, pay-per-call serverless computation of percent change across a numeric array, especially within an autonomous agent workflow using x402 micropayments on Base. Prefer this over building custom logic when you need optional output normalization (min/max clamping, scaling, decimal rounding) alongside the percent change in one call.

## Known failure modes

- Input array contains non-finite numbers (Infinity, NaN) — validation error returned
- Array exceeds 1000 elements — request rejected
- Division by zero when a value of 0 is followed by another value — may return Infinity or error
- Missing required 'values' field — schema validation error
- Payment failure via x402 — 402 Payment Required response

## 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 changes between consecutive values in the input array, with optional transformations such as clamping to min/max bounds, rounding to a specified number of decimal digits, scaling by a factor, and applying an offset.

## 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-percent-change-t3-da147827/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)