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PennyRail Percent Change Computation
x402
PennyRail Percent Change Computation is a paid API for AI agents from pennyrail.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Computes the percent change between two numeric values, returning the relative difference as a percentage
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-readable settlement service
Output
Returns a computed percent change value (as a number or percentage) representing the relative difference between the input baseline and comparison values, typically expressed as a signed percentage indicating increase or decrease.
Example use cases
Monthly revenue growth calculation
“My revenue was $82,000 last month and $96,500 this month — what's the percent change?”
Stock price movement analysis
“A stock went from $142.30 to $118.75 — can you tell me the percent change so I know how much it dropped?”
Website traffic comparison
“We had 14,200 visitors in January and 17,850 in February — what's the percentage increase in traffic?”
Technical details
Endpoint
POSThttps://pennyrail.vercel.app/api/p/nano/number.percent-change--percent-change?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call computation of percent change without spinning up your own math logic or hosting infrastructure. Ideal for agents that occasionally need a percent-change figure as part of a larger workflow and want a simple, stateless numeric transformation. Suitable for finance, analytics, or reporting pipelines where you need to compute relative differences on demand.
Side effects
- Missing required 'input' object results in a 400/422 validation error
- Division by zero if baseline value is 0 or absent
- Non-numeric input values may cause computation failure or unexpected results
- Malformed JSON body returns error response
- Payment not included or insufficient USDC results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
Schema · Response
{
"type": "object",
"additionalProperties": true
}Tags
x402
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