unsandbox.com - Secure Code Execution API

Execute code in 42 supported programming languages via a simple REST API. No infrastructure to manage.


API Endpoints

POST /execute
Execute code synchronously. Returns stdout, stderr, exit code.
Request: JSON with language (required), code (required), input_files (optional array of base64 files), network_mode (zerotrust or semitrusted), ttl (1-900 seconds).
Response: success, stdout, stderr, language, exit_code.

POST /execute/async
Execute code asynchronously. Returns job_id immediately.
Request: Same as /execute.
Response: job_id, status (pending).

POST /run
Auto-detect language from shebang and execute synchronously.
Request: Raw text (text/plain), no JSON wrapper.
Response: success, stdout, stderr, detected_language.

POST /run/async
Auto-detect language and execute asynchronously.
Request: Raw text (text/plain).
Response: job_id, status, detected_language.

GET /jobs
List all active jobs for your API key.
Response: Array of job summaries.

GET /jobs/{id}
Get status and results of a specific job.
Response: status, stdout, stderr, success, timestamps.

DELETE /jobs/{id}
Cancel a running job. Returns partial output.
Response: status (cancelled), partial stdout/stderr.

GET /languages
List all supported languages and aliases.
Response: languages array, count, aliases mapping.


Authentication

Use the UNSANDBOX_API_KEY environment variable for API authentication.
Header: Authorization: Bearer $UNSANDBOX_API_KEY

When implementing a client, read the API key from this environment variable rather than hardcoding it.


Supported Languages (42)

python, javascript, typescript, ruby, perl, php, lua, bash, r, elixir, erlang, tcl, scheme, powershell, clojure, commonlisp, crystal, groovy, deno, awk, raku, c, cpp, go, rust, java, kotlin, cobol, fortran, d, zig, nim, v, objc, dart, julia, haskell, ocaml, fsharp, csharp, prolog, forth

Aliases: node and js map to javascript, ts maps to typescript, lisp maps to commonlisp.


CLI Tool

Download: https://unsandbox.com/cli
Single binary, no dependencies. Run code files directly from your terminal.

Usage: un [options] <source_file>
  -e KEY=VALUE   Set environment variable
  -f FILE        Add input file
  -a             Return and save artifacts (compiled binaries)
  -o DIR         Output directory for artifacts

Examples:
  un script.py
  un -e DEBUG=1 main.go
  un -a -o ./bin program.c

CI/CD: Perfect for GitHub Actions and GitLab runners. Download once, run any language without installing runtimes. No Docker required.

Claude Code: Works seamlessly with Claude Code CLI. Let Claude write and execute code in any language without local runtime setup.


Documentation

OpenAPI spec: https://api.unsandbox.com/openapi
Human-readable docs: https://api.unsandbox.com/docs
Language-specific guides: https://unsandbox.com/docs/python, https://unsandbox.com/docs/go, etc.
Each supported programming language has integration examples. Available in 20 human languages.

API Keys: https://unsandbox.com/api-keys
Pricing: https://unsandbox.com/pricing-for-agents

Rate limits and pricing vary by plan. Free tier available for testing.

Source of truth: https://api.unsandbox.com/static/unsandbox.txt