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Leap Year Check
x402
Leap Year Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Returns a boolean indicating whether a given Gregorian calendar year is a leap year
Price / call$0.001
Success—
StatusUnknown
How this service works
Leap year check. Use for date validation and calendar math without external data. Returns a boolean leap-year result for a Gregorian year. $0.001 USDC per successful call via x402 on Base—deterministic first-party JSON, no API key, no subscription, and nothing is billed on structured validation errors.
Output
A JSON object containing a boolean field indicating whether the supplied year is a leap year under Gregorian calendar rules (divisible by 4, except century years unless also divisible by 400). Response is deterministic and first-party; no external data sources are consulted.
Example use cases
Date validation in scheduling pipeline
“Before I generate the schedule for February 2096, can you confirm whether 2096 is a leap year so I know if February 29th is a valid date?”
Historical calendar research check
“I'm writing about Julius Caesar's calendar reforms — can you tell me if the year 46 BC (year 46 in Gregorian) was a leap year?”
Automated form field validation
“A user just entered February 29, 1900 as their birthday — is 1900 actually a leap year so I can tell them if that date is valid?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/is-leap-yearWhen to prefer
Choose this endpoint when you need a deterministic, authoritative leap-year answer for a single year without shipping your own calendar logic, relying on a math library, or handling edge cases like century years. Ideal for agents that need to validate calendar dates, compute February day counts, or perform date arithmetic as part of a larger workflow, especially when operating in environments where a lightweight, pay-per-call model is preferable to maintaining a dependency.
Side effects
- Year out of range (below 1 or above 9999) returns a structured validation error with no charge
- Non-integer or missing year field returns a structured validation error
- Payment not provided or insufficient returns an x402 payment-required error before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| year | integer | Gregorian calendar year. |
Output
Schema · Response
{
"type": "json",
"example": {
"year": 2028,
"schema": "delx/is-leap-year/v1",
"is_leap_year": true
}
}Tags
x402
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