Example inputPOST /api/v1/x402/is-leap-year
{
"year": 2028
}Portable intent card · utility
Leap Year Check API for agents
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.
Intent to transaction
One command, attributed.
The source header follows this discovery route through challenge, payment and delivery without exposing the buyer or request body.
npx agentcash@latest fetch https://api.delx.ai/api/v1/x402/is-leap-year -m POST -H 'x-delx-source: intent-card-is-leap-year-api' --max-amount 0.001 -b '{"year":2028}'Agent discoverydelx/intent-card/v1
{
"intent": "Leap Year Check for an agent workflow",
"tool_name": "util_is_leap_year",
"price_usdc": "0.001",
"machine_url": "https://commerce.delx.ai/intents/is-leap-year-api.json"
}Portable and inspectable