# E2B

E2B is an open-source runtime for executing AI-generated code in secure cloud sandboxes.

- Category: Developer
- Connection: API key. Paste your own E2B API key once. It is stored encrypted and only your workspace uses it.
- Plans: Free: Not included; MCP only ($9/mo): 2,000 calls a month; Pro: 20,000 calls a month; Max: 20,000 calls a month

## Tools

- Run code (`E2B__RUN_CODE`): Runs code in an E2B.dev sandbox

## Questions

### How do I connect E2B to Krypton?

Open Integrations in Krypton, find E2B and choose Connect, then paste your API key. Every bot in the workspace can then use it, and you choose which bots get which apps.

### Which plan includes E2B?

MCP only with 2,000 calls a month, Pro and Max with 20,000. Calls are shared by every catalog app in the workspace. Past the monthly number they keep working from AI credits at $0.90 per 1,000 calls; the count resets on the 1st (UTC) and a retried call counts once.

### Can I use E2B from Claude or Cursor?

Yes. Connect it in your workspace, then add https://mcp.krypton.bot as a streamable HTTP MCP server with your kmcp_ workspace key. Calls count toward the same monthly number.

Back to the [MCP catalog](https://krypton.bot/mcp-catalog/).