Cloudflare R2

S3-compatible object storage with zero egress fees.

What It Is

R2 is object storage that’s API-compatible with S3 but without egress charges. It integrates directly with Workers for fast access from serverless functions.

How We Use It

R2 stores all persistent data in our platform:

• Sandbox filesystems: Files created and modified in SmartBoxes
• Immutable ledgers: Nomos event storage for audit trails
• Artifacts: Build outputs, deployments, and assets
• Backups: Snapshot storage for sandbox state

Why It Matters

Zero egress fees mean we can serve content globally without cost anxiety. Direct Worker integration means fast access without network hops.

Provided By

• Cloudflare

Used By Capabilities

• Smartbox: capability-scoped execution workspaces
• Nomos: domains compiled to OpenAPI, MCP, CLI and SDKs

Used By Tooling

• Wrangler CLI