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PennyRail Number Percent Change
x402
PennyRail Number Percent Change 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 between two numeric values, returning the operation name and result
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a JSON object with an 'operation' string identifying the computation performed and a 'result' field containing the calculated percent change value (typically a decimal or percentage number).
Example use cases
Track monthly revenue growth
“Revenue went from $42,000 last month to $57,500 this month — what's the percent change?”
Monitor stock price movement
“A stock was at 128.50 yesterday and closed at 141.20 today. Can you calculate the percent change?”
Measure user count growth
“We had 8,400 active users last quarter and now have 11,050. What's the percentage change?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/f/number.percent-changeWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call computation of percent change between two numbers without setting up local math logic. Ideal for AI agents that need on-demand arithmetic in pipelines where installing a math library is impractical, or when traceability of the operation name alongside the result is useful.
Side effects
- Missing 'from' or 'to' fields in the input object returns a validation error
- Division by zero if 'from' value is 0 (percent change is undefined)
- Non-numeric inputs may cause computation failure
- Payment failure via x402 protocol results in 402 response before computation occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | {from,to} |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| resultrequired | — | |
| operationrequired | string |
Tags
x402
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