Agent37

Agent37 (agent37.com) is a Y Combinator-backed AI agent sandbox / infra product: “You build the agents. We run the infrastructure,” claiming ~94% lower cost than many sandbox vendors. The site highlights gVisor (or VM) isolation, per-minute billing, sleep-when-idle, hosted harnesses (Hermes, Claude Code, Codex, OpenCode, …), free personal-agent credit, and startup customers.

In this scan window a founder pricing chart (2 vCPU / 4 GB always-on month: Vercel $249 vs Agent37 $4.76) went viral on X; Vercel’s CEO and community notes argued active-CPU metering makes the apples-to-apples claim misleading. Regardless, Agent37 is a concrete new product proper noun with a live site and launch chatter.

Problem

Agents often idle waiting on tokens; paying full-month always-on sandbox rates is expensive. Agent37 pushes pricing toward viable per-user always-on boxes.

Differentiation

Versus Vercel/Cloudflare/Daytona/E2B/Modal: lower always-on sticker price and agent harness templates; idle vs active-CPU billing is the debate—run your own math.

Limits

• Busy workloads may erase the gap; load-test with real agent traces.
• Read Security/Docs for isolation, regions, SLA.
• Viral comparison tables may be caveated by community notes.

Who it is for

Products that want an isolated sandbox per end user where agents are mostly idle; solo builders hosting Claude Code/Codex-style harnesses.

Getting started

1. Sign up at agent37.com and use the free credit.
2. Run your harness on 2vCPU/4GB; measure create/wake latency and busy-hour cost.
3. Compare against Daytona/E2B/Vercel bills before migrating.