{"uid":"cap_3CSnBwifsaCiJNLk633_D","slug":"api-cn402-com-5695408d","name":"BaZi Four Pillars Calculator (四柱八字)","description":"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.","url":"https://api.cn402.com/bazi/sizhu","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"birth":{"type":"string","description":"Birth (required)"},"gender":{"type":"string","description":"Gender (optional)"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.16","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.16/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.16","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.16","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2vbFOKQJM2FKQ2NhZkrfe","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.16","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Converts a Western birth datetime into the Four Pillars of Destiny (year, month, day, hour gan-zhi pairs) used in Chinese astrology","exampleAgentPrompt":"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.","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:47:47.537Z","isFirstParty":false}