How to Deploy FastAPI App or API For Free On Vercel For Free

app--
  api.py

main.py
requirements.txt
vercel.json

from fastapi import FastAPI

app = FastAPI()

@app.get('/')
def home():
    return {'msg': 'Welcome in my api'}

from dotenv import load_dotenv
import os
import uvicorn

load_dotenv()

PORT = int(os.get('PORT', 8000))
HOST = '0.0.0.0'

if __name__ == '__main__':
    uvicorn.run('app.api:app', host = HOST, port = PORT, reload = True)

{
    "builds": [{
        "src": "app/api.py",
        "use": "@vercel/python",
        "config": { "maxLambdaSize": "15mb" }
    }],
    "routes": [
        {
            "src": "/(.*)",
            "dest": "app/api.py"
        }
    ]
}

vercel .

Vercel CLI 33.3.0
❗️  Your Project was either deleted, transferred to a new Team, or you don’t have access to it anymore.
? Set up and deploy “~\OneDrive\Desktop\python new videos\How to Deploy FastAPI App or API For Free On Vercel”? [Y/n] y
? Which scope do you want to deploy to? username
? Link to existing project? [y/N] n
? What’s your project’s name? testapi
? In which directory is your code located? ./
🔗  Linked to username/testapi (created .vercel)
🔍  Inspect: https://vercel.com/username/testapi/CdFMgqWYpMmxPi7fiPx9jxvbnSNR [2s]
✅  Production: https://testapi-k0lnh2w00-username.vercel.app [2s]
📝  Deployed to production. Run `vercel --prod` to overwrite later (https://vercel.link/2F).
💡  To change the domain or build command, go to https://vercel.com/username/testapi/settings