Skip months of sandbox engineering. One POST request, isolated execution, JSON response. Built for AI agents, coding platforms, EdTech, and internal tools.
No Docker orchestration. No sandbox hardening. No runtime patching. Just send code and get results.
Every execution runs inside a gVisor user-space kernel. Syscalls are intercepted before reaching the host.
Scripting languages (Python, JS, Bash, C) execute in ~400ms. Compiled languages take 1–3s. No cold start queue — every request gets its own sandbox instantly.
Python, JavaScript, TypeScript, Go, Java, C++, C, and Bash. The runtimes that cover 95% of real-world use cases.
Run up to 100 code snippets in a single API call. Perfect for test suites, grading, and bulk processing.
Pass standard input to your programs. Build interactive code runners, challenge validators, and test harnesses.
Just 4 fields: language, code, stdin, timeout. One POST request, one JSON response. Integrate in minutes.
Latest stable versions. Pre-warmed pools. Strict resource limits. Each running in its own isolated gVisor sandbox.
You could build this yourself. Here's why most teams don't.
You'd need gVisor or Firecracker for real isolation, resource limit enforcement, output capture, timeout handling, multi-language image management, and security hardening. That's weeks of engineering before you handle your first request.
Serverless functions aren't designed for untrusted code. No syscall filtering, no memory isolation between invocations, no protection against fork bombs or network abuse. SandboxAPI is built for hostile input from day one.
Self-hosting means provisioning servers, managing container images, patching runtimes, and monitoring uptime. SandboxAPI is a managed API: one POST request, we handle the infrastructure, you ship faster.
Real-world examples you can run right now. Click any example to try it in the playground.
Run AI-generated functions against a test harness, get structured pass/fail results
Try it →Execute generated data processing code and return computed results as JSON
Try it →Run generated business rules to validate records with detailed error reporting
Try it →Grade algorithm submissions against hidden test cases with execution timing
Try it →Benchmark solutions at scale and verify time complexity meets O(n) requirement
Try it →Run the same challenge across languages and verify output consistency
Try it →Score student code against a weighted rubric with 14 test cases across 3 categories
Try it →Validate student functions against hidden test suites with detailed feedback
Try it →Test student expressions with stdin input and automated evaluation
Try it →Check production configs against security rules, flag errors and warnings
Try it →Transform raw sales data into formatted reports with leaderboards and breakdowns
Try it →Run ETL pipeline steps and validate each transformation produces correct output
Try it →No infrastructure to manage. No containers to configure. Just send code and get results.
Call the /execute endpoint with your code, language, and optional stdin.
Your code executes inside an isolated gVisor sandbox with strict resource limits and no network access.
Receive stdout, stderr, exit code, and execution time in a clean JSON response.
# Execute Python code with stdin
curl -X POST https://api.sandboxapi.dev/execute \
-H "Content-Type: application/json" \
-H "X-RapidAPI-Key: YOUR_API_KEY" \
-d '{
"language": "python3",
"code": "name = input()\nprint(f\"Hello, {name}!\")",
"stdin": "World",
"timeout": 30
}'All plans include gVisor isolation, 8 languages, and batch execution. No hidden fees.
Get your API key and start executing code in minutes. 500 free executions, no credit card required.