{
  "markdown": "# Code Sandbox API\n\n[![MCP Server](https://img.shields.io/badge/MCP-server-blue)](https://code-sandbox.api.klymax402.com/mcp)\n[![x402](https://img.shields.io/badge/payments-x402-6E56CF)](https://x402.org)\n[![License: MIT](https://img.shields.io/badge/license-MIT-green)](LICENSE)\n\nExecute Python, JavaScript, or SQL in a sandbox. Get stdout, execution time, errors. 10s timeout. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.\n\nPart of the [klymax402](https://klymax402.com) marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.\n\n## Quickstart -- MCP\n\nAdd to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):\n\n```json\n{\n  \"mcpServers\": {\n    \"code-sandbox\": {\n      \"url\": \"https://code-sandbox.api.klymax402.com/mcp\"\n    }\n  }\n}\n```\n\n## Quickstart -- HTTP (x402)\n\n```bash\ncurl -X POST \"https://code-sandbox.api.klymax402.com/api/execute\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"code\":\"...\",\"language\":\"...\"}'\n# -> 402 Payment Required, with an x402 payment challenge in the response body\n```\n\nAny x402-aware client ([`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.\n\n## Tools\n\n| Tool | Method | Path | Price | Description |\n|---|---|---|---|---|\n| `code_execute_sandbox` | POST | `/api/execute` | $0.02 | Execute code in a sandboxed environment |\n\n### `code_execute_sandbox`\n\nUse 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).\n\n**Parameters**\n\n| Name | Type | Required | Description |\n|---|---|---|---|\n| `code` | string | yes | The code to execute |\n| `language` | string | yes | Programming language: python, javascript, or sql |\n| `timeout` | number | no | Execution timeout in milliseconds (default: 5000, max: 10000) |\n\n**Returns**\n\n- `output` -- stdout captured from code execution (max 10KB)\n- `language` -- the language that was executed\n- `executionTimeMs` -- execution duration in milliseconds\n- `exitCode` -- process exit code (0 = success)\n- `error` -- error message if execution failed (null on success)\n\nExample response:\n\n```json\n{\"output\":\"Hello World\\n42\\n\",\"language\":\"python\",\"executionTimeMs\":234,\"exitCode\":0,\"error\":null}\n```\n\n**When to use**: running calculations, data transformations, validating code snippets, or querying in-memory databases. Essential when you need computed results rather than static data.\n\n## Example agent prompts\n\n- \"Execute Python, JavaScript, or SQL code in a sandboxed environment and get the output\"\n\n## Payment\n\n- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key\n- Network: Base L2 (`eip155:8453`)\n- Asset: USDC\n- Facilitator: Coinbase CDP (primary), PayAI (fallback)\n- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)\n\n## Part of klymax402\n\n100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.\n\n- Catalog: https://klymax402.com/llms.txt\n- Full API reference: https://klymax402.com/llms-full.txt\n- Live stats: https://klymax402.com/stats\n\n## License\n\nMIT\n",
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  "repo_slug": "br0ski777/code-sandbox-x402",
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  "api": "https://agentalog.com/api/listings/mcp_io_github_br0ski777_code_sandbox_65d7860c/readme"
}