FastAPI Guide

Best Hosting for FastAPI (2026)

Compare the best hosting platforms for FastAPI. We review Railway, Render, Fly.io, and serverless options with ASGI support and deployment patterns.

FastAPI requires ASGI servers (Uvicorn, Hypercorn) and platforms that support async Python. We've evaluated hosting options from PaaS to serverless.

Pourquoi C'est Important

FastAPI's async performance shines with the right hosting. You need platforms supporting ASGI, proper worker configuration, and optional auto-scaling for async workloads.

Considérations Clés

ASGI Server Support

FastAPI needs Uvicorn, Hypercorn, or similar ASGI server. Most platforms auto-detect Python and can run Uvicorn.

Worker Configuration

Uvicorn workers, Gunicorn with Uvicorn workers, or multiple containers. Tune for your workload.

Serverless Option

FastAPI works on AWS Lambda (with Mangum), Vercel Functions, and Modal. Good for variable traffic.

Background Tasks

FastAPI has built-in BackgroundTasks, but for heavy work, you need separate workers (Celery, ARQ).

Websockets

If using FastAPI websockets, ensure your platform supports persistent connections.

Nos Recommandations

Railway

Meilleur Global Excellent Support SDK Officiel

Railway auto-detects FastAPI and runs Uvicorn. Add PostgreSQL and Redis with one click. $5/month free credit. Excellent DX.

railway up

Site Web → Documentation →

Render

Meilleur Plan Gratuit Excellent Support SDK Officiel

Render offers free web services with spin-down. Native FastAPI detection. Good for MVPs and side projects.

render deploy

Site Web → Documentation →

Fly.io

Meilleur pour Global Excellent Support SDK Officiel

Fly.io deploys containers globally. Excellent for low-latency APIs. Built-in PostgreSQL. 3 free VMs.

fly launch

Site Web → Documentation →

Modal

Meilleur Serverless Excellent Support SDK Officiel

Modal is built for Python. Run FastAPI as serverless functions with GPU support. Great for ML APIs. Pay per second.

pip install modal && modal deploy

Site Web → Documentation →

Vercel

Meilleur pour APIs Simples Bon Support

Vercel Functions support Python. Good for simple FastAPI endpoints. Limited execution time. Pair with external DB.

vercel deploy

Site Web → Documentation →

Comparaison Rapide

Service	TypeScript	Edge	Offre Gratuite	Temps de Configuration
Railway	none	✓	$5/month credit	10 min
Render	none	✓	Free (spin-down)	15 min
Fly.io	none	✓	3 VMs free	15 min
Modal	none	✓	$30/month credit	10 min
Vercel	none	—	Generous	5 min

Démarrage Rapide

FastAPI Dockerfile Dockerfile

FROM python:3.12-slim

WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

Modèles d'Intégration Courants

Railway + Supabase

FastAPI on Railway, Supabase for database and auth. Simple full-stack setup.

railway supabase supabase-auth

Fly.io Global + Redis

FastAPI on Fly.io edge, Redis for caching, PostgreSQL for persistence.

fly-io redis postgresql

Modal + ML Models

FastAPI on Modal with GPU workers for ML inference APIs.

modal

Questions Fréquemment Posées

How many Uvicorn workers should I use? ▼

For CPU-bound: 2 * CPU cores + 1. For I/O-bound (typical API): 4 * CPU cores. Start with 2-4 and monitor.

Should I use Gunicorn with Uvicorn workers? ▼

For production, Gunicorn + Uvicorn workers provides better process management. Use: gunicorn main:app -w 4 -k uvicorn.workers.UvicornWorker

Can I run FastAPI on AWS Lambda? ▼

Yes, use Mangum as an adapter. It converts Lambda events to ASGI. Good for variable traffic APIs.

What's the cheapest FastAPI hosting? ▼

Render's free tier (with spin-down) is cheapest for low-traffic. Railway's $5 credit works for always-on. Modal is cheapest for sporadic traffic.

Guides Connexes

FastAPI database Django hosting Flask hosting

Comparer en Détail

Dernière mise à jour: January 11, 2026