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PennyRail Percent Change Calculator
x402
PennyRail Percent Change Calculator is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes the percent change (percentage change) between two numeric values
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a numeric result representing the percent change between the two input values, typically expressed as a percentage (e.g. 12.5 for a 12.5% increase or -8.3 for an 8.3% decrease).
Example use cases
Stock price change calculation
“What is the percent change in a stock that went from $142.50 to $167.80?”
Sales growth comparison
“My company had revenue of $500,000 last year and $620,000 this year — what is the percentage change?”
Weight loss progress tracking
“I started at 210 pounds and now weigh 187 pounds, can you calculate the percentage change?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/number.percent-change--percentage-changeWhen to prefer
Choose this endpoint when you need a quick, reliable, pay-per-call computation of percentage change between two numbers without hosting your own math service. Particularly useful in financial, analytics, or reporting pipelines where you want to avoid implementing and maintaining the formula yourself and are already operating within a micropayment-enabled (x402) workflow.
Side effects
- Missing required input fields returns a validation error
- Division by zero if the original value is zero (percent change is undefined)
- Non-numeric input values may cause computation errors
- Malformed input object structure returns a schema error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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