Agent37 Sells Agent Sandboxes at $4.76 a Month, and Its $0.37 Average Is Mostly Idle Time

Agent37, a Y Combinator Fall 2026 company that rents cloud sandboxes to AI agents, launched on Hacker News with a claim that customers pay an average of $0.37 a month per sandbox. Its own pricing page prices a 2 vCPU, 4 GB sandbox that runs all month at $4.76, which suggests the $0.37 describes a mostly idle box, not a working one.

The Launch HN post, written by founder Vishnu (username vishnukool), had 160 points and 119 comments when The Terminal read it. It says Agent37 sells sandboxes "at under 10% of the cost of most sandbox providers." The company's site lists the unit rates and a calculator, and says it powers agents for more than 100 companies, a figure The Terminal could not check.

Where $4.76 and $4.94 come from

The two prices in circulation are not a contradiction. The pricing page bills $0.0011 per vCPU-hour, $0.00096 per GB-hour of memory and $0.00012 per GB-hour of disk, and puts a 2 vCPU, 4 GB sandbox with a 4 GB disk at $4.76 for a full month. In the thread, Vishnu wrote that the same box is $4.94 with a 6 GB disk. Two extra gigabytes of disk over about 730 hours is roughly $0.18, which accounts for the gap.

Billing is prepaid and metered per minute, with no plan fee. Compute stops when a sandbox sleeps, and an idle sandbox with a 4 GB disk costs about $0.36 a month, which is nearly the whole of the $0.37 average.

1. Agent370.37 $ per month
2. AWS EC24.36 $ per month
3. Hetzner6.49 $ per month
4. Daytona and E2B9.44 $ per month
5. Vercel Sandbox19.43 $ per month

Source: agent37.com pricing calculator, accessed 2026-10-14

The calculator is the company's, built on its own usage assumptions, and it is the source of the "94% lower cost" line. Against the AWS figure in the same calculator the gap is 8.5 percent of the cost, or a 91.5 percent saving. Agent37 says it offers a refund to anyone who finds a cheaper sandbox.

How the price is held down

Vishnu wrote that Agent37 skips the large cloud providers and rents servers from Hetzner and OVH, and that its default sandboxes use gVisor, a sandboxing layer that lets many boxes share one host's memory. Full virtual machines are offered for work that needs more isolation. The post says the gVisor boxes do not support Docker-in-Docker or Android emulators.

Over 90 percent of new sign-ups are on the free plan, according to the post, so the average is pulled down by accounts that cost almost nothing. The company says a free user costs $0.05 to $0.10 a month in infrastructure and is capped at about 10 awake hours a week.

What commenters pushed back on

Several commenters said the price is the weak point. User mparis predicted "a race to the bottom against very well funded alternatives," and MikhailTal said sandboxes "look a bit commoditized." User lasiotus wrote that gVisor is less secure than a virtual machine, so a price comparison against VMs is not like for like. User ekorondy said credential scoping and egress control matter more than a cheaper box.

The company's security page lists SOC 2 Type I as achieved and Type II as in progress, plus encryption at rest and in transit and gVisor isolation per sandbox. Vishnu described the company in the thread as bootstrapped and said it began in February as one of the OpenClaw wrapper companies. Agent37 now hosts several agent harnesses, among them Claude Code and Codex.

The same question about what a headline number measures applies to context-mode's 98 percent claim, another agent-tooling figure that depends on the baseline. The incumbents are also moving: Cloudflare bought Deno to merge two runtimes, and a sandbox seller competing on price alone is competing against companies like that.

The next test is the Type II report. Agent37 lists it as in progress and gives no date.