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Code Sandbox API

br0ski777/code-sandbox-x402

Gives Claude a sandboxed runtime for executing Python, JavaScript, and SQL snippets on demand. The server connects to a remote API at klymax402.com and uses x402 micropayments, meaning you'll incur small charges per execution. Useful when you need to test code fragments, run quick calculations, or validate SQL queries without spinning up local environments. The GitHub repo is sparse on implementation details, but the core value is clear: outsourced code execution with pay-per-use billing. Reach for this when you want Claude to run actual code and return real output rather than just generating examples.

tool
1
transport
SSE
last updated
May 16, 2026
View on GitHub

Tools

1 tools

Public tool metadata for what this MCP can expose to an agent.

code_execute_sandboxUse this when you need to execute Python, JavaScript, or SQL code in a sandboxed environment and get the output. Supports Python (subprocess), JavaScript (eval), and SQL (in-memory SQLite). 1. output3 params

Use this when you need to execute Python, JavaScript, or SQL code in a sandboxed environment and get the output. Supports Python (subprocess), JavaScript (eval), and SQL (in-memory SQLite). 1. output

Parameters* required
codestring
The code to execute
languagestring
Programming language: python, javascript, or sqlone of python · javascript · sql
timeoutnumber
Execution timeout in milliseconds (default: 5000, max: 10000)

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Readme

Code Sandbox API

MCP Server x402 License: MIT

Execute Python, JavaScript, or SQL in a sandbox. Get stdout, execution time, errors. 10s timeout. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "code-sandbox": {
      "url": "https://code-sandbox.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://code-sandbox.api.klymax402.com/api/execute" \
  -H "Content-Type: application/json" \
  -d '{"code":"...","language":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

View the full README on GitHub

Details

Repository
github.com/br0ski777/code-sandbox-x402
Website
github.com/Br0ski777/code-sandbox-x402
Category
Databases
Transport
SSE
Registry
MCP registry, active

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