Servers
Rent, harden, and scale servers as customers arrive.
Backed byY Combinator
Host any agent harness.
Hermes
OpenClaw
Claude Code
Codex
OpenCode
Grok- Custom harness
Give each customer an agent in its own isolated sandbox. Persistent files, browser access, and connections to Gmail, Slack, and other apps.
$1 free credit
Just want an agent for yourself? Create your free personal agent
Read the docs first: https://www.agent37.com/docs/llms-full.txt Build me a real estate assistant using Hermes.
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 $0.37Disk $0.36
Monthly usage comparison
vs Agent37- Agent37$0.731×
- HetznerCX23 · EU$6.498.8×
- AWS EC2c6a.large · US East$4.746.5×
- Daytona$10.2714×
- E2B$10.2714×
- Cloudflare Sandbox2 vCPU · 6 GB$12.3416.8×
- Modal$14.7520.1×
- Vercel Sandbox$21.1328.8×
Unit rates
vCPU
$0.0011
per vCPU · hour
Memory
$0.00096
per GB · hour
Disk
$0.00012
per GB · hour
Compute is billed while your sandbox runs. Disk is billed while retained, awake or asleep.
Request
curl https://api.agent37.com/v1/instances \
-H "Authorization: Bearer sk_live_..." \
-H "Content-Type: application/json" \
-d '{"template":"agent37-hermes"}'Response
{
"id": "ab12cd34ef",
"status": "running"
}One agent is an MVP.
Running 1,000 is an infra company.
Here's what you'd have to build.
Architecture
Every customer gets their own sandbox
One call provisions a sandbox per customer. Message it across as many sessions as you like. Its files, memory, and connected tools stay put until you delete it.
Runs whatever you build with.
Agents
HermesOpenClawClaude CodeCodexOpenCodeGrokPlus your own Docker image.
Models
ClaudeOpenAIGeminiGrokManaged models, or bring your own key.
Apps
GmailSlackNotionGitHubGoogle Calendar
1,000+ app connections via Composio.
Custom skills & plugins
Preinstall your own skills, prompts, and tools with a custom template.
Streaming events
Stream text and tool activity as your agent works.
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.
gVisor, built at GoogleOne 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.
Cloudflare global edgeOutbound to the internet only
Egress is firewalled per sandbox: the public internet and nothing else. Not the host, not private networks.
Deny by defaultEncrypted at rest
Your sandbox's disk, backups, and metadata are encrypted at rest, and every connection is encrypted in transit.
At rest and in transitCustomer stories
What builders are shipping.
Agent products, customer workflows, and businesses built on Agent 37.
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 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 $1 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.
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$1 free credit