Simple AI compute sandboxes. Pay by the second.
Temporal compute for AI agents. Spin up isolated containers on Fly Machines.
Example cost: 3m session ≈ $0.03 (est.)
Simplicity & speed
Slow starts and heavy DevOps kill momentum. We wrap Fly Machines with a simple API (optional pre‑warmed pool).
Real pricing
Opaque monthly plans hide usage. Stripe metered billing tracks per‑second so you pay only for what runs.
Logs that scale
MVP uses REST polling for logs; post‑MVP provides sink tail/search via WS/SSE.
Compatibility (optional)
Minimize lock‑in with an E2B‑compatible JS SDK for drop‑in migration.
E2B → FlyBox (60s)
Same concepts, smaller bill. Copy‑pasteable examples.
import { Sandbox } from '@e2b/sdk'
const s = await Sandbox.create()
const { stdout } = await s.exec('node -v')
await s.close()import { Sandbox } from '@flybox/sdk'
const s = await Sandbox.spawn({ template: 'node' })
const { stdout } = await s.exec('node -v') // HTTP exec (MVP)
await s.stop()Comparison
| FlyBox | E2B | DIY | |
|---|---|---|---|
| Price model | Per‑second | Monthly | Hidden ops cost |
| Cold start | ~1s | ~150ms | Variable |
| SDK compatibility | E2B‑compatible | N/A | DIY |
| Logs | REST tail (MVP) | ? | Depends |
| Self‑host | Managed | No | Yes (ops) |
Hobby
The perfect place to dabble with AI agentic compute.
- 10 hours of compute
- Limit to 1 hour per session
- Up to 20 concurrently running sandboxes
Pro
Everything in Hobby to scale your agentic capacity.
- Everything in Hobby
- No limits for session duration
- Up to 5,000 concurrently running sandboxes
FAQ
Is this compatible with E2B?
Yes; see SDK docs.
How do logs work?
REST polling in MVP; WS/SSE post‑MVP.
How is billing calculated?
Per‑second metering via Stripe (see PRD).
Security / isolation?
Fly Machines isolation; details in docs.
Regions and limits?
See PRD for current limits.