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Leap Year Checker
x402
Leap Year Checker is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Checks whether a given year is a leap year and returns related info including days in that year, adjacent leap years, and the Gregorian rule
Price / call$0.001
Success—
StatusUnknown
How this service works
Check whether a year is a leap year and get related info: days in that year, the next and previous leap years, and the Gregorian leap-year rule.
Output
Returns whether the queried year is a leap year, the total number of days in that year (365 or 366), the next leap year after it, the previous leap year before it, and a description of the Gregorian leap-year rule applied.
Example use cases
Example prompt
“Is 1900 a leap year? And while you're at it, tell me how many days were in that year and what the next leap year after it was.”
Technical details
Endpoint
POSThttps://agent402.tools/api/leap-yearWhen to prefer
Use this endpoint when you need authoritative leap-year determination with adjacent leap year context (next/previous) and don't want to implement Gregorian calendar logic yourself — especially useful for date arithmetic, calendar generation, or validating user-supplied years.
Side effects
- Year out of range (must be 1–9999) returns a validation error
- Non-integer or missing year field returns a 400-level error
- Payment not included or invalid results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| year | integer | Year to check (1-9999) |
Output
Schema · Response
{
"type": "json",
"example": {
"year": 2024,
"isLeap": true,
"leapRule": "Divisible by 4, except centuries unless also divisible by 400",
"nextLeap": 2028,
"prevLeap": 2020,
"daysInYear": 366
}
}Tags
x402
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