Easter date (Computus) API

Computes Easter Sunday for a year via the Computus algorithm — Western (Gregorian) or Orthodox (Julian, returned as the Gregorian-calendar date). Answers 'What date is Easter 2026?', 'When is Orthodox Easter?'.

Price$0.04per request

MethodPOST

Route/v1/datetime/easter

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

datetimeeastercomputusholidayorthodoxgregorianjulianmovable-feast

API URLhttps://x402.hexl.dev/v1/datetime/easter

Integration docs

Example request

{
  "year": 2026
}

Example response

{
  "year": 2026,
  "calendar": "gregorian",
  "easterSunday": "2026-04-05",
  "weekday": "Sunday",
  "interpretation": "Western Easter 2026 falls on 2026-04-05 (Sunday)."
}

Input schema

{
  "type": "object",
  "required": [
    "year"
  ],
  "properties": {
    "year": {
      "type": "integer",
      "examples": [
        2026
      ]
    },
    "calendar": {
      "type": "string",
      "enum": [
        "gregorian",
        "julian"
      ],
      "examples": [
        "gregorian"
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}