CubeSandbox
A high-performance, E2B-compatible sandbox service for AI agents, built on RustVMM and KVM, creating hardware-isolated sandboxes in under 60 milliseconds with less than 5 megabytes of memory overhead.
CubeSandbox is a sandbox service for AI agents, built on RustVMM and KVM, that creates a hardware-isolated, fully serviceable sandbox in under 60 milliseconds with less than 5 megabytes of memory overhead. It is compatible with the E2B SDK, and supports both single-node deployment and scaling out to multi-node clusters, including deployment of its control plane and compute nodes on Kubernetes.
A copy-on-write snapshot engine gives it event-level snapshots, instant cloning and rollback to any saved state, and an auto-pause feature suspends idle sandboxes and wakes them again on the next request. Cross-node pause and resume, backed by an S3 storage backend, lets a sandbox be suspended on one node and resumed on another, or created from a snapshot.
Other features include a Terraform-based one-click cluster deployer, native ARM64 support, per-sandbox network-policy hardening with traffic tokens and policy-routed egress, a credential vault that lets an agent call external APIs without its keys ever entering the sandbox, and a dashboard that shows template health and version status across a deployment.