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BaZi Four Pillars Calculator (四柱八字)
x402
BaZi Four Pillars Calculator (四柱八字) is a paid API for AI agents from api.cn402.com, paid per call via x402, $0.16/call, status unknown (last checked 2026-09-15).
Converts a Western birth datetime into the Four Pillars of Destiny (year, month, day, hour gan-zhi pairs) used in Chinese astrology
Price / call$0.16
Success—
StatusUnknown
How this service works
BaZi Four Pillars, 八字四柱, Chinese astrology birth chart, 生辰八字, heavenly stems earthly branches, 天干地支, year-month-day-hour pillars, Chinese natal chart, Ba Zi calculator, Day Master, 日主. Compute Four Pillars of Destiny (year/month/day/hour gan-zhi) from any Western birth datetime. Foundation of Chinese astrology analysis.
Output
Returns the four gan-zhi pillar pairs (year, month, day, hour), each consisting of a Heavenly Stem (天干) and Earthly Branch (地支), plus the Day Master identification — forming the complete BaZi birth chart foundation used in Chinese astrology analysis.
Example use cases
Example prompt
“Can you calculate the BaZi Four Pillars of Destiny for someone born on March 15, 1990 at 7:30 AM — I need the gan-zhi for all four pillars including the Day Master.”
Technical details
Endpoint
GEThttps://api.cn402.com/bazi/sizhuWhen to prefer
Use this endpoint when you need to compute the foundational Four Pillars (四柱) from a Western birth datetime as the basis for any Chinese astrology analysis — including Day Master strength, Ten Gods, Major Luck Cycles, or Shen Sha calculations. It is the essential first step before calling sibling endpoints that require gan-zhi input.
Side effects
- Invalid or missing birth date returns a 400 error
- Birth time out of valid range (e.g. hour > 23) causes a validation error
- Dates before the supported historical range may return an error or unexpected results
- Missing required datetime fields returns a parameter error
- Payment not included or insufficient triggers a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| birth | string | Birth (required) |
| gender | string | Gender (optional) |
Tags
x402
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