Blaxel is a cloud infrastructure platform for AI agents designed to eliminate cold start times. Its persistent sandboxes remain dormant indefinitely and resume in less than 25ms, guaranteeing near-zero latency for agentic workflows. The platform also offers serverless agent hosting, MCP servers, a unified gateway for accessing LLMs, and 360° observability tools. Certified SOC 2, HIPAA, and ISO 27001, Blaxel is available in Europe and US regions. Funded by Y Combinator with $7.3M raised.
What is Blaxel?
The essentials
Blaxel is a cloud infrastructure platform specialized in hosting and executing AI agents. It stands out through persistent sandboxes based on isolated microVMs that never shut down, thus eliminating cold starts. The platform also offers serverless agent hosting as APIs, MCP servers to connect agents to external tools, a unified gateway for accessing multiple LLMs, and a native observability suite for monitoring agent activity. Blaxel is available in Europe and US regions.
Key features
Blaxel’s sandboxes rely on a microVM architecture that maintains filesystem and memory state between sessions. 25ms resume is guaranteed regardless of dormancy duration. The platform offers serverless agent hosting that exposes agents as RESTful APIs. The Model Gateway centralizes LLM access with telemetry, cost control, and intelligent routing. MCP server hosting enables agents to securely access external tools. The observability suite provides complete visibility into calls, errors, costs, and performance for each agent.
Use cases
Blaxel is adopted by teams developing AI agents for production applications. SaaS startups use it to host conversational agents without worrying about scalability. Data teams create isolated environments for untrusted code execution. Companies with compliance constraints deploy their agents while benefiting from SOC 2, HIPAA, and ISO 27001 certifications. Engineering teams use the Model Gateway to centralize and monitor all their LLM calls.
Advantages
Cold start elimination is the most immediate benefit: agents respond in milliseconds rather than seconds, transforming user experience. Billing only for dormant storage drastically reduces costs compared to solutions billing continuous compute time. Multi-tenant architecture with hardware isolation guarantees data security. Compliance certifications simplify audit procedures for companies in regulated sectors.
Pricing
Blaxel offers a free plan including $200 in credits at signup, no credit card required. Pricing is then pay-as-you-go: dormant sandboxes only consume snapshot storage at approximately $0.00000007716 per GB per second, essentially free at rest. Compute is billed only during active execution. Premium plans with dedicated support and SLAs are available for enterprises.
Conclusion
Blaxel provides an elegant and effective technical answer to the cold start problem in agentic deployments. For engineering teams building AI agent-based products, it’s an essential infrastructure combining performance, enterprise security, and billing flexibility.