Agent 37
Host any agent harness
Agent 37 is a sandbox hosting service that provisions an isolated environment for each customer running an agent harness. It supports Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, or a custom Docker image, and is backed by Y Combinator.
Each sandbox runs under gVisor kernel isolation with its own filesystem and disk quota, with traffic entering through Cloudflare's edge over TLS. Sandboxes can be created and messaged via API (cURL, Python, TypeScript), and support managed models or bring-your-own keys across Claude, OpenAI, Gemini, and Grok. App connections are available through Composio, paid tools through Perflo, and custom templates let you preinstall skills, prompts, and tools. Scheduled cron runs are supported, and outbound egress is firewalled per sandbox.
Agent 37 is aimed at teams building agent products or customer-facing agent workflows. Billing is usage-based with no subscription or plan fee: compute is charged per minute while a sandbox runs, disk is charged while retained, and model or tool usage meters separately from a prepaid balance. New accounts receive a starter credit once a card is on file.
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