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Saju & BaZi MCP server

Your AI can build a real Four Pillars birth chart and explain it, using calculated data instead of guessing.

This is a helper for AI that works out Korean Saju (사주) and Chinese BaZi (八字) birth charts. You give it a birth date and time, and it does the calendar math properly instead of letting the AI make it up. It is handy if you enjoy astrology readings, or if you study these traditions and want the chart itself to be right.

What is an MCP server? The 30-second version

On its own, your AI can only chat. It has no way to look up a birth chart or check a calendar. An MCP server is a small helper program that gives your AI one new skill. This one connects your AI to the CAFE engine, a Saju and BaZi calculator, so when you ask about a birth chart, the AI can actually get the real numbers back and then write the reading for you.

What this MCP server does

You tell your AI a birth date, time and place. The AI passes that to this helper, which sends it to the CAFE engine. The engine works out the Four Pillars, the Five Elements, the hidden stems, the luck cycles and the exact solar term times. The results come back to your AI as structured data, and your AI turns them into a reading in your own language. Same birth data in, same chart out, every time.

What you can do with it

Build a full Four Pillars chart from a birth date and time
Show the ten-year luck cycles and yearly or monthly pillars
Look up a whole month of solar and lunar dates with exact solar term times
Search 980 Saju terms in Korean, Hanja and English
Search classical texts like Ziping Zhenquan and Qiongtong Baojian
Find the dates and times that produce a given set of pillars
Find a city's longitude so births outside Korea are corrected properly

Try asking your AI

“Here is my birth data: 14 March 1988, 7:20 in the morning, born in Busan. Please build the chart and explain it.”
“What are my ten-year luck cycles, and which years fall in each one?”
“Show me the solar terms for next month with their exact times.”
“What does the term Day Master mean? Look it up for me.”

What it gives back to you

You get the chart facts back in the chat: the four pillars, the Five Elements, the Ten Gods, hidden stems, life stages, combinations and clashes. You also get lists like a month of calendar dates, or search results from the term dictionary and the classics. Your AI then writes the explanation in plain language, using those facts as its base. On the paid plan you also get engine judgments like structure pattern and useful element candidates.

Before you start

What you need

A free 24PLUS account (you sign in when you add the connector)
An MCP client such as claude.ai, the Claude apps, ChatGPT, Claude Code or Cursor
For some clients, an API key from https://24plus.ai.kr/my (a kind of password the site gives you)

Good to know

The free plan allows 10 different charts and 300 tool calls a month, so check your usage if you look up many people's charts.

Install it with your AI

Add Saju & BaZi MCP server to your AI, no technical skills needed

You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.

Sign in to get the install prompt

Members get a ready-made prompt that lets the Claude desktop app check Saju & BaZi MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,361 MCP servers here for you.