# ONE Engine Sequential Percentage Change Calculator (Tier 5)

> ONE Engine Sequential Percentage Change Calculator (Tier 5) is a paid API for AI agents from one-search.one-engine.workers.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-18).

Calculates sequential percentage changes across a numeric series and returns 5 progressively richer statistical output feature sets.

## Facts

- Endpoint: POST https://one-search.one-engine.workers.dev/v3/numeric/percent-change/t5?utm_source=zero.xyz
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/one-engine-sequential-percentage-change-calculator-tier-5-f11104d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0caCMVAr_RWJG_XSg0p8W

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-sequential-percentage-change-calculator-tier-5-f11104d9 -d '<json body>'
```

Example prompt: Calculate the sequential percentage changes for this series of monthly revenue figures — 10000, 12500, 11800, 13400, 15200, 14900 — and give me the full set of 5 statistical output feature tiers.

## When to prefer this

Choose this endpoint when you need not just raw sequential percentage changes but also a layered statistical summary (5 feature sets) over those changes — useful when you want to go beyond simple delta percentages to understand the distribution, volatility, and trend of changes in a numeric series. Prefer this over a basic percent-change calculator when your use case demands richer numeric analytics in a single call. The Tier 5 bundle is a mid-tier option among the 10-tier range, offering a balanced depth of statistics at $0.0025 per call.

## Known failure modes

- Input array with fewer than 2 values returns an error or empty result
- Non-numeric values in the input series cause a parsing or validation error
- Extremely large or infinite values may produce NaN or overflow in percentage calculations
- Missing or malformed request body returns a 400 bad request
- Payment not included or invalid causes a 402 Payment Required response

## How this service works

Calculate sequential percentage changes with progressively richer numeric statistics. Tier 5/10 standard bundle with 5 output feature sets.

## Output

Returns a set of 5 progressive statistical output feature sets covering sequential percentage changes between each consecutive pair of values in the input series. This includes computed percent-change values for each step, along with progressively enriched numeric statistics such as min, max, mean, variance, and higher-order descriptive metrics across the change series.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/one-engine-sequential-percentage-change-calculator-tier-5-f11104d9/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)