Code Sandbox API
What it does
Execute Python, JavaScript, SQL code in a sandbox. x402 micropayment.
- Connects Runs in the cloud
- Account or key No key needed
- Category Developer tools
Install
Pick the AI app you use, then copy the settings.
Passed 3/4 checks · Runs on your computer
We hid some of the commands
Connect by URL: the server address did not answer when we checked
No install path has passed yet. See the maker’s instructions or pick another server in this category · Maker’s install instructions · Others in this category
First: which AI do you use?
Pick your app and the steps appear below.
Claude cannot connect Code Sandbox API yet
No install path has passed yet. See the maker’s instructions or pick another server in this category
ChatGPT cannot connect Code Sandbox API yet
No install path has passed yet. See the maker’s instructions or pick another server in this category
What you can do instead
B · Others in Developer tools that work with ChatGPT
Picked from the most used in the same category, only ones that connect by address with no key
- Sentry✓ ChatGPT
- Compiler Explorer✓ ChatGPT
- GitDiagram✓ ChatGPT
Claude Code cannot connect Code Sandbox API yet
No install path has passed yet. See the maker’s instructions or pick another server in this category
Cursor cannot connect Code Sandbox API yet
No install path has passed yet. See the maker’s instructions or pick another server in this category
VS Code cannot connect Code Sandbox API yet
No install path has passed yet. See the maker’s instructions or pick another server in this category
No install path has passed yet. See the maker’s instructions or pick another server in this category
At a glance
- Downloads per weeki
- Not on npm/PyPI
- Connection
- Runs in the cloud
- Transport
- sse
- Latest versioni
- 1.1.0
- Categoryi
- Developer tools
- Published to registryi
- May 16, 2026
- Code last changedi
- Sep 3, 2026
- Maker
- Br0ski777
- Website
- github.com
- Registry status
- Active
Which apps can use it
Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.
Connect over the internet in
GooseLM StudioMsty StudioCherry StudioVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast
Related guides
What it can do
The server did not answer when we last checked, so we could not read its tools.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 14, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account Br0ski777, which owns the repo
- ✓ Pass
Still maintained
Code last changed 2 months ago
- ✓ Pass
Has a licence
Uses MIT
- ✕ Fail
Endpoint responds
Did not respond within 6 seconds when we checked
- – Not applicable
Sign-in with OAuth
Did not respond within 6 seconds when we checked
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Discussion
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User reviews
No reviews yet
Compared with others in Developer toolsi
- More stars than 0% of the other 5866 servers in this category
- Published to the registry more recently than 12% of the other 5866 servers in this category
- Basic checks equal to or better than 46% of the other 5866 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Code Sandbox API safe?
It passed 3 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed 2 months ago, and the latest version (1.1.0) reached the registry 6 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT on the web (full MCP on Business and above; Pro read-only).
Others in the same category
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Code Sandbox API
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
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
code_execute_sandbox | POST | /api/execute | $0.02 | Execute code in a sandboxed environment |
code_execute_sandbox
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).
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
code | string | yes | The code to execute |
language | string | yes | Programming language: python, javascript, or sql |
timeout | number | no | Execution timeout in milliseconds (default: 5000, max: 10000) |
Returns
output-- stdout captured from code execution (max 10KB)language-- the language that was executedexecutionTimeMs-- execution duration in millisecondsexitCode-- process exit code (0 = success)error-- error message if execution failed (null on success)
Example response:
{"output":"Hello World\n42\n","language":"python","executionTimeMs":234,"exitCode":0,"error":null}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.
Example agent prompts
- "Execute Python, JavaScript, or SQL code in a sandboxed environment and get the output"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT