Directory / Fly Machines
Fly Machines
Verified
API-controlled Fly.io microVMs for ephemeral agent computers.
Fly Machines is Fly.io's API for starting and stopping microVMs. Teams can use the machines as ephemeral agent computers. The API is distinct from Fly's full PaaS.
- Model support
- Multi-model
- Deployment
- Cloud
- Open source
- No
- License
- Proprietary platform; docs public
- Pricing model
- Usage
- Added / updated
- 19 Aug 2026 / 19 Aug 2026
Assessment
Machines can provide a custom sandbox layer when you control the image and network policy. They are compute primitives; a complete agent harness and Fly's other products remain separate concerns.
Strengths
- API-first microVM lifecycle.
- Suitable for custom agent runtimes.
- Usage-priced compute.
Limitations
- Fly-hosted service.
- Distinct API from Fly Apps.
- No agent harness.