Create main.py

main.py

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+from fastapi import FastAPI
+from pydantic import BaseModel
+from fastapi.middleware.cors import CORSMiddleware
+import uvicorn
+
+app = FastAPI()
+
+# Enable CORS for frontend requests
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Request model
+class SIPRequest(BaseModel):
+    P: float = 5000  # Monthly investment
+    i: float = 12  # Annual interest rate
+    n: int = 10  # Number of years
+
+# SIP Calculation Function
+def calculate_sip(P: float, i: float, n: int):
+    monthly_rate = i / 12 / 100  # Convert annual rate to monthly decimal
+    n_payments = n * 12  # Convert years to months
+    M = P * (((1 + monthly_rate) ** n_payments - 1) / monthly_rate) * (1 + monthly_rate)
+    total_invested = P * n_payments
+    estimated_returns = M - total_invested
+    return {"final_amount": M, "total_invested": total_invested, "estimated_returns": estimated_returns}
+
+@app.post("/api/sip")
+async def sip_api(data: SIPRequest):
+    return calculate_sip(data.P, data.i, data.n)
+
+if __name__ == "__main__":
+    uvicorn.run(app, host="0.0.0.0", port=7860)