Best Hosting for AI Agents: From Fly.io to Bare Metal
Where to host AI agents in 2026. Compare Fly.io, Lambda, DigitalOcean, and bare metal for AI chatbot deployment.
AI agents have specific infrastructure requirements that differ from typical web apps. Here's our ranking.
Best Overall: Fly.io
Why: Persistent VMs, multi-region, auto-scaling, volume storage — exactly what AI agents need.
- Persistent connections (Telegram/Discord webhooks)
- Volumes for conversation history storage
- Multi-region for global latency
- Pay-for-what-you-use pricing
Verdict: Best fit for most AI agents. DX + infrastructure alignment is excellent.
Best for Serverless: AWS Lambda + API Gateway
Why: If you can architect around cold starts and statelessness.
- Cold start problem: 100ms-10s (problematic for chatbots)
- Good for: scheduled AI tasks, not real-time chatbots
Verdict: Only if your agent is stateless and event-driven.
Best for Bare Metal: Hetzner + Coolify
Why: Maximum cost efficiency for high-volume agents.
- €4/month entry point
- Full control
- Requires more DevOps
Verdict: For technical teams optimizing cost at scale.
Best for Enterprise: AWS App Runner + VPC
Why: If you're locked into AWS ecosystem.
- More expensive than Fly.io
- Better AWS integration
- More complex setup
Verdict: Only if you have existing AWS infrastructure and compliance requirements.
Comparison
| Platform | Best For | Cost | Cold Starts | |----------|----------|------|-------------| | Fly.io | Persistent chatbots | Pay/use | None | | Lambda | Event-driven AI | Per-invoke | 100ms-10s | | Hetzner + Coolify | Max cost efficiency | €4+/mo | None | | AWS App Runner | AWS ecosystem | $15+/mo | 2-5s |