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OpenFate Bazi MCP server

Let your AI build accurate Bazi (Four Pillars) charts instead of guessing the calendar math.

This is a small helper that lets your AI do proper Bazi (Four Pillars) chart calculations. It runs on your own computer and does the tricky calendar work for you. It is handy if you read or write about Bazi and want the chart numbers to be right.

What is an MCP server? The 30-second version

On its own, your AI can only chat. It cannot look up a real chart or run a calculation you can trust. An MCP server is a small helper program you connect once, and it gives your AI a new skill. Here that skill is Bazi calculation, so when you ask for a chart, your AI calls this helper and gets real results back instead of making them up.

What this MCP server does

You type a birth date and time into your chat, along with the place or timezone. Your AI passes those details to this helper. The helper runs the Bazi calculation on your computer, including solar terms, True Solar Time, and the day boundary rules. Then it hands the results back to your AI, which explains them to you in the chat.

Flow diagram: you ask your AI “Build a Bazi chart for 15 June 1990, 14:30, Taipei”, on your own computer the OpenFate Bazi MCP server works with your own computer, and you get back A full Bazi chart.

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What you can do with it

Build a full Bazi chart from a birth date, time, and place
Correct the hour pillar using True Solar Time
Convert between lunar and solar calendar dates
List Da Yun luck cycles with their timing
Spot branch relationships like clashes, combinations, and harms
Work backwards from a four-pillar string to possible birth times
Explain why one tool's hour pillar differs from another's

Try asking your AI

“Build a Bazi chart for someone born 15 June 1990 at 14:30 in Taipei, female”
“Why does the hour pillar change when I use True Solar Time?”
“What branch interactions are in this chart: 戊寅己未己卯辛未?”
“Find possible birth dates for the Bazi 戊寅己未己卯辛未”

What it gives back to you

You get a structured chart back: the four pillars, Ten Gods, hidden stems, Na Yin, void branches, and growth stages. It also includes the Da Yun cycles with a timing receipt, and the calendar data used. Your AI then turns that into a readable explanation in the chat.

Before you start

What you need

Node.js installed on your computer
The Claude desktop app, Cursor, Cline, or another tool that supports MCP servers

Good to know

The reverse lookup only gives possible candidate times, so always recalculate with the exact birth place, timezone, and True Solar Time before treating a result as final.

Install it with your AI

Add OpenFate 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 OpenFate 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 4,066 MCP servers here for you.