# Calendar Systems Age Profile

> Calendar Systems Age Profile is a paid API for AI agents from calendar-systems.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-27).

Returns a comprehensive age profile for a birth date including years/months/days lived, Korean/East Asian ages, next birthday with leap-day handling, and Chinese zodiac.

## Facts

- Endpoint: GET https://calendar-systems.x402tookit.com/age-profile?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-27
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/calendar-systems-age-profile-b04ac50d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A3yDHRy-C_Rbi_z0yDc2k

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability calendar-systems-age-profile-b04ac50d
```

Example prompt: How old am I in years, months, and days if I was born on 1990-07-15? Also tell me my Korean age, Chinese zodiac animal, and when my next birthday falls.

## When to prefer this

Use this endpoint when you need a rich, culturally-aware age profile that goes beyond simple year counting — especially when Korean or East Asian age conventions, Chinese zodiac information, leap-day birthday handling, or total days/weeks lived are needed. Prefer this over generic date-difference utilities when the user wants multiple age representations in one call.

## Known failure modes

- Missing required 'birth' query parameter returns an error
- Invalid date format (not YYYY-MM-DD) causes a parse error
- Future birth dates may return unexpected or null values
- Invalid 'asOf' reference date format returns an error
- Network or payment failure returns a 402 or 5xx response

## How this service works

Age in years, months, days and days lived, Korean and East Asian ages, next birthday with leap-day rules, and zodiac.

## Output

A JSON object containing: age broken down into years, months, and remaining days; total months, weeks, and days lived; international age; Korean year age and Korean traditional age; birth weekday; next birthday date and weekday; days until next birthday; whether today is the birthday; whether the birth date is a leap day; next birthday if March 1 is used for leap-day birthdays; Chinese zodiac animal, element, and year; and the Julian day number of the birth date.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "birth"
     ],
     "properties": {
      "asOf": {
       "type": "string",
       "description": "Reference date YYYY-MM-DD (default today, UTC)"
      },
      "birth": {
       "type": "string",
       "description": "Birth date YYYY-MM-DD"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "ageDays": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "ageYears": {
       "type": [
        "null",
        "number"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "ageMonths": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "totalMonths": {
       "type": [
        "null",
        "number"
       ]
      },
      "birthWeekday": {
       "type": [
        "null",
        "string"
       ]
      },
      "nextBirthday": {
       "type": [
        "null",
        "string"
       ]
      },
      "koreanYearAge": {
       "type": [
        "null",
        "number"
       ]
      },
      "totalDaysLived": {
       "type": [
        "null",
        "number"
       ]
      },
      "birthdayIsToday": 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/calendar-systems-age-profile-b04ac50d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from calendar-systems.x402tookit.com](https://www.zero.xyz/host/calendar-systems.x402tookit.com/llms.txt)