Agent37
Pay-by-the-minute cloud sandboxes for hosting your AI agents
Overview
Each sandbox is a full Linux machine with root access, a terminal, a browser and desktop the agent can drive, and persistent storage that survives between sessions. It runs Claude Code, Codex, OpenCode, Grok, Pi, Hermes, OpenClaw or your own Docker image, with 1,000+ app integrations through Composio and gVisor isolation underneath.
The pitch is price: no subscription, metered compute, memory and disk, and idle boxes sleep and only pay for storage. It is a Y Combinator F26 company that launched on Hacker News on 12 October and picked up 127 points and 91 comments.
Key Features
Isolated sandbox per agent, gVisor kernel isolation
Full Linux root, terminal, browser and desktop control
Works with Claude Code, Codex, OpenCode, Grok, Pi, Hermes, OpenClaw or custom Docker images
1,000+ app integrations via Composio
Sleep/wake for idle sandboxes, automatic backups
Per-sandbox spend caps
Pricing
Starting price
$0.0011/vCPU-hour (usage-based, no flat tier)
Pay as you go, no subscription.
Compute: $0.0011 per vCPU-hour
Memory: $0.00096 per GB-hour
Disk: $0.00012 per GB-hour
New accounts get a $5 starter credit once a card is added
Example from the site: a 2 vCPU / 4GB sandbox costs about $0.37 a month when mostly idle. Idle sandboxes only pay for disk. Caveat: that figure is the low end. A box running agents continuously is billed for every vCPU-hour, so budget from your real usage and set a spend cap.
Pros
Genuinely cheap at idle: a 2 vCPU / 4GB box that is rarely used comes to about $0.37 a month
No subscription, no minimums; you pay for minutes used
Spend caps per sandbox
Bring-your-own agent or Docker image, not locked to one vendor
$5 starter credit for new accounts
Cons
Cheap at idle is not cheap at load. Per-vCPU-hour billing scales with real use, and an agent that runs all day costs far more than the headline figure
Founded this year; the launch is a day old and there are no independent long-term reviews
The '95% cheaper' claim is the vendor's own comparison
Card required to claim the starter credit
No affiliate programme listed
What Makes It Unique
Metered per-minute pricing with sleep/wake makes an always-available agent box nearly free when it is idle, where most agent hosts sell flat monthly plans.
Kay Score
7
/ 10
