YOUR SANDBOX HTTPS
:3000
demo-3000.agent37.appKEY REQUIRED
:8080
app.yourdomain.comYOUR DOMAIN
Networking
Give your app an authenticated URL. Expose public ports or connect your own domain.
Backed byY Combinator
Hermes
OpenClaw
Claude Code
Codex
OpenCode
Grok
Pi
Cloud Sandbox for Agents.
You build the agents. We run the infrastructure.
94% lower cost than most sandbox providers.
$5 free credit
Host your agent harness.
Choose a ready-made harness or bring your own. Keep each customer’s tools, files, and credentials in a separate sandbox.
HermesOpenClawClaude CodeCodexOpenCodeGrokPiYour harness
Powering agents for over 100 companies
Pricing
94% lower cost than most sandbox providers
Find a cheaper sandbox? We’ll refund the difference.
4 GB persistent disk
1 hourAlways running
Monthly estimate
Compute $0.34Disk $0.03
Monthly usage comparison
Sources- Agent37$0.371×
- HetznerCX23 · EU$6.4917.5×
- AWS EC2c6a.large · US East$4.3611.7×
- Daytona$9.4425.4×
- E2B$9.4425.4×
- Cloudflare Sandbox2 vCPU · 6 GiB$11.3430.5×
- Modal$13.5636.5×
- Vercel Sandbox$19.4352.3×
Unit rates
vCPU
$0.0011
per vCPU · hour
Memory
$0.00096
per GB · hour
Disk
$0.00012
per GB · hour
Metered by the minute: compute while the sandbox runs, disk while you keep it. This estimate assumes you delete the sandbox after the hours shown.
Up to $10,000 in credits for startups.
$1,000 to start, then we match what you spend.
We run the infrastructure.
Connect your apps, keep your files, and see what’s happening in every sandbox.
SANDBOX LIFECYCLE AUTO-SLEEP
Running
Sleeping
Waking
Running
No activity → sleepNew request → wake
Lifecycle
Start, stop, resize, or restart. Turn on auto-sleep to pause compute charges while idle.
~/workspace AFTER RESTART
├─ memory.json24 KBpreserved ✓
└─ reports/
└─ results.csv128 KBpreserved ✓
✓ Backup complete02:00 UTC
Storage
Keep files across sessions, sleep, and restarts. Restore from automatic backups when you need to.
CPU 38%RAM 1.2 GB
Worker connectedINFO
Job completedINFO
Observability
Track CPU, memory, and disk usage. Read logs to see what ran and what needs attention.
Illustrative previews
Runs whatever you build with.
Agents
HermesOpenClawClaude CodeCodexOpenCodeGrokPiPlus your own Docker image.
Models
ClaudeOpenAIGeminiGrokManaged models, or bring your own key.
Apps
GmailSlackNotionGitHubGoogle Calendar
1,000+ app connections via Composio.
Paid tools
Web scrapingSocial dataPeople & companiesImage & videoEmail & calls
Bought one call at a time, about a cent each, through Perflo. No vendor accounts, no keys.
Custom skills & plugins
Preinstall your own skills, prompts, and tools with a custom template.
Scheduled runs
Give an agent a cron schedule; it runs unattended and you read the results.
Security
Every workload is treated as untrusted
We do not collect your prompts, files, or terminal sessions, and your data is never used to train AI models. SOC 2 Type I and readiness reports on request.
Isolation enforced by the kernel
Every sandbox is enforced by gVisor, with its own filesystem and a hard disk quota. Tenants can never see each other.
One door in
Hosts have no public hostname. Every request enters through Cloudflare's edge over TLS and needs your API key, unless you've explicitly made a port public.
Outbound to the internet only
Egress is firewalled per sandbox: the public internet and nothing else. Not the host, not private networks.
Encrypted at rest
Your sandbox's disk, backups, and metadata are encrypted at rest, and every connection is encrypted in transit.
Customer stories
What companies are shipping.
Agent products, customer workflows, and businesses built on Agent 37.
Maddie Wang
Founder @ Vision
“We haven’t had any CPU problems since, and I’ve been coding on Vision and OGTool, multiple instances.”
Vision gives every live coding session its own machine, sized to the app it runs.
Read the case study
Wes Merrill
Cofounder @ Boon
“We had tried for nearly 6 months to do this on our own, that took only a few days of setup and effort working with Agent37.”
Boon gives nonprofits their own Hermes agents for grant fundraising.
Read the case study
Chris Nguyen
Founder @ ETEC+
“Ideally I just want to sell, and not do any backend.”
ETEC+ moved from creating agents by hand to selling a branded product with signup and billing.
Read the case study
Yeshu Agarwal
Founder @ Perflo
“We don’t want to get into this DevOps business.”
Perflo shipped an always-on agent per customer without hiring anyone to run a fleet.
Read the case studyFAQ
How does billing work?
You top up a prepaid balance and each sandbox spends it down per minute while it runs. No subscription, no plan fee, no minimum, and new accounts get a $5 starter credit once a card is on file, and nothing is charged until you top up. If the balance runs out, your sandboxes go to sleep until you top up again.
Is this a monthly subscription, or do I pay compute on top?
Neither. There is no subscription and nothing is added on top of it. You are charged per minute of uptime at your sandbox's own rate: a 2 vCPU 4 GB sandbox left running every minute of a month is $4.76, and the meter drops to its disk alone the minute it stops or sleeps. Delete it and you pay nothing. Model tokens, search, and integrations meter separately from the same balance, unless you bring your own keys.
What do I pay when an agent is idle?
Its disk alone, $0.36 a month for 4 GB. Compute stops the minute a sandbox stops or goes to sleep, and once you delete it you pay nothing.
Can I use my own model keys?
Yes, and that spend never touches your balance. Use our gateway instead and models, search, and integrations meter from the same balance, with a spend cap you set per sandbox.
How long can one agent run?
As long as you keep it. Nothing times out mid-task, and what your agent writes to disk is still there on the next call, weeks later.
Build the agent product your customers need.
Your harness, your workflows, your brand. Hosting, connections, models, and tools ready to build on.
Start Free
$5 free credit