InputPOST /api/v1/x402/is-leap-year
{
"year": 2028
}Web and API intelligence · utility
Leap Year Check
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.
One-command purchase
Run it from an agent.
No account or API key. AgentCash reads the 402 challenge, pays no more than the declared cap, retries the request and returns the result.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/is-leap-year -m POST -H 'x-delx-source: product-page' --max-amount 0.001 -b '{"year":2028}'Delivered resultapplication/json
{
"schema": "delx/is-leap-year/v1",
"year": 2028,
"is_leap_year": true
}Machine-readable evidence