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PennyRail Percent Change / Growth Percent Calculator
x402
PennyRail Percent Change / Growth Percent Calculator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status down (last checked 2026-11-04).
Computes the percent change (growth percent) between two numeric values via a paid API call
Price / call$0.001
Success—
StatusDown
How this service works
Machine-readable settlement service
Output
Returns a numeric percent change (growth percent) value computed from the provided input numbers, packaged as a JSON object with arbitrary additional properties depending on the service's response structure.
Example use cases
Monthly Revenue Growth Tracking
“My revenue went from $84,000 last month to $102,000 this month — what's the percent change so I can report it to the team?”
Portfolio Return Calculation
“My stock position was worth $4,250 when I bought it and it's now worth $5,100 — can you calculate the growth percent for me?”
Website Traffic Change Reporting
“Last week we had 12,400 visitors and this week we have 9,800 — what's the percent change so I can include it in my weekly report?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/number.percent-change--growth-percent?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-use percent change or growth percent calculation without standing up your own math infrastructure, especially in an agent workflow that already uses x402 micropayment rails and needs a simple numeric transformation step.
Side effects
- Missing or malformed input object returns a validation error
- Non-numeric input values may cause computation failure
- Insufficient USDC balance or failed x402 payment results in 402 Payment Required
- Starting value of zero causes division-by-zero error
- Network timeout on the Vercel serverless function
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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