Agent37, a YC F26 company founded by Vishnu, is launching sandboxes designed to run at significantly lower cost than competitors. The company started as an OpenAI wrapper tool in February but evolved into a broader agent hosting platform supporting frameworks like Hermes, OpenClaw, and Claude Code.
The startup achieves its cost advantage through three main strategies: dynamic CPU and RAM allocation that matches agent workload patterns, bypassing hyperscalers like AWS in favor of lower-cost providers like Hetzner and OVH, and efficient resource caching and sharing across host machines. Free plan users—which make up over 90% of new signups—cost the company roughly $0.05 to $0.10 per month to support.
Paid customers average $0.37 per sandbox monthly, undercutting traditional sandbox providers by roughly 90%. The company bootstrapped initially but has now scaled operations enough to offer a free tier.
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