Fly.io
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Fly.io
Infrastructure to deploy AI agents on isolated Linux machines with stateful memory. Run MCP servers and global apps with true pay-as-you-go pricing.
General Information about Fly.io
Fly.io is a global infrastructure platform designed to run applications and databases close to end users. Its specific offering for the artificial intelligence ecosystem is built around Sprites, which are hardware-isolated Linux computers optimized for deploying AI agents, evaluation tools, and autonomous workflows. Unlike temporary execution environments or limited sandboxes, this solution offers real machines that maintain state persistence, allowing compute costs to drop to zero when there are no active processes.
The tool's technology is based on micro VMs (Fly Machines) that guarantee complete physical isolation, making it ideal for securely running untrusted code. One of its critical features is automatic checkpointing, which allows an AI agent to save its exact progress and resume it in the future without losing context. This is complemented by the Sprites Block Device, a durable and scalable file system that allows machines to enter sleep mode without shutting down, keeping all data available for the next activation.
Key capabilities include:
- Coding Agents: Provides each agent with its own persistent Linux environment where tools like Claude or Codex can operate without losing previous configurations.
- MCP Servers (Model Context Protocol): Enables running context servers with persistent disks and custom egress policies, while only paying for the tool calls performed.
- Deployment of AI-Generated Apps: Each unit has its own HTTPS URL, allowing applications created by agents to move into production immediately.
- Security via Connectors: Manages credentials for external services (such as Slack or GitHub) through an API gateway, preventing sensitive tokens from being stored directly on the Sprite.
Fly.io’s infrastructure stands out for its technical performance, with machine boot times under one second and typical deployments in about 500 ms. With a presence in more than 18 global regions, it offers private networking, autoscaling, and flexible disk management that grows up to 100 GB based on write requirements. The system is designed so that developers can scale from a personal project to large-scale production without needing to re-architect the infrastructure, maintaining the same API and computing primitives. Additionally, it includes support for Managed Postgres and compliance options like HIPAA and SOC2, ensuring a professional environment for critical workloads from any computer or terminal via its command-line interface.
Features and Use Cases of Fly.io
How Fly.io Works
Frequently Asked Questions about Fly.io
What are Fly.io Sprites and what benefits do they offer developers?
They are hardware-isolated Linux machines that automatically save their state when stopped, allowing AI agents to resume their work exactly where they left off.
How are Fly.io machines billed when they are stopped?
For stopped machines, you are only charged for the necessary root file system storage at a cost of $0.15 per gigabyte per month.
Will my Managed Postgres database be deleted if I decide to delete my application?
No, as the managed Postgres service operates independently of your applications and must be manually deleted from the dashboard to avoid unexpected charges.
What technical support options does the Fly.io platform offer?
Community support is free for all users, while direct support from engineers is available through paid plans starting at $29 per month.
Is it possible to get a discount on Fly.io compute services?
Yes, you can receive a 40% discount by reserving machines in advance for a specific region and processor type.
How does billing work for network data transfer?
All inbound data traffic is free; you are only billed for outbound data transfer to the internet or between different regions based on the corresponding geographic zone.
What security do Fly.io connectors provide for managing external credentials?
They allow you to configure connections to external services once for the entire organization, ensuring that access tokens are never stored within individual machines.
What is the typical boot time for a Fly.io machine?
Fly.io machines are optimized for exceptional performance, with boot times of less than one second and deployments that typically complete in 500 milliseconds.
How are SSL certificates managed for hosted applications?
The platform automatically issues managed certificates via Let's Encrypt, with the first ten single-hostname certificates being free for each organization.
What happens if my automated deployment system makes an error and generates excessive charges?
If the spending is unforeseen and appears unusual on your bill, you can contact the support team to review the case and waive accidental charges if you are a customer on a paid plan.
Fly.io Pricing
Free Plan and Base Allowances
- Community support included for all users.
- First 10 volume snapshots free every month (up to 10 GB).
- First 10 single-hostname SSL certificates free per organization.
- Inbound data transfer is completely free.
- Free unlimited Anycast IPv6s for global load balancing.
Pay-as-You-Go (Infrastructure)
- Pricing based strictly on resource consumption (pay-as-you-go).
- Shared CPU machines: From $1.94/mo (1 CPU, 256MB RAM) to $85.59/mo (8 CPU, 16GB RAM).
- Performance CPU machines: From $31.00/mo (1 CPU, 2GB RAM) to $976.25/mo (16 CPU, 128GB RAM).
- Stopped machines: $0.15/GB per month for the root file system (rootfs).
- Persistent storage (Volumes): $0.15/GB per month of provisioned capacity.
- Dedicated IPv4: $2/mo.
- Static outbound IPs: Approximately $3.60/mo ($0.005/hr).
- Outbound data transfer: From $0.02/GB in North America and Europe; up to $0.12/GB in Africa and India.
Support Plans
- Standard: $29/mo. Includes direct access to engineers and refunds for accidental deployment charges.
- Premium: $199/mo. Priority support for mission-critical workloads.
- Enterprise: From $2,500/mo. Includes custom resource configurations, SLA requirements, and emergency support.
Fly Kubernetes (FKS)
- Price: $75/mo per cluster.
- Requires additional payment for the Fly compute resources and volumes used within the cluster.
HIPAA Compliance
- Price: $99/mo.
- Includes everything needed for workloads requiring HIPAA compliance, BAA agreements, and SOC2.
Reserved Machines (Savings)
- 40% discount off standard pricing via annual upfront payment.
- Shared CPU blocks: From $36/year (provides $5/mo in credit).
- Performance CPU blocks: From $144/year (provides $20/mo in credit).
- Credit is monthly, does not roll over, and applies only to CPU and additional RAM charges.
Sprites (AI Agents)
- Run MCP servers and agents with disk persistence.
- Scalable storage up to 100 GB (billed only for bytes written).
- Costs drop to zero when the agent is inactive (the system goes to sleep and saves state).
- Check the official website for specific private beta billing details.
Fly.io Screenshots
