WBX Sandbox
Secure execution for AI agents - Give your AI agents a safe place to run code
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We built WBX Sandbox to give AI agents a safe way to run code – either full Linux microVMs or fast WebAssembly – and to return concise, auditable results with cost limits. It lets you fire off single jobs or batches of up to 1,000 tasks, track receipts, and stay within a budget without any credit card. I'd love your thoughts on the API and the receipt format. Try submitting a 1,000‑task batch via /v1/batches and let me know if anything breaks 😊
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WBX Sandbox runs AI-generated code in isolated Firecracker microVMs or WebAssembly with budgeting and audit receipts.
- for
- Developers building AI agents that need secure code execution.
- pricing
- freemium · free trial
Key features
- Isolated runtimes — Run code in full Linux microVMs or lightweight WASI modules with hardware or process isolation.
- Budget Guard — Reserve a maximum cost before execution and refuse jobs that would exceed limits.
- Execution receipts — Each run returns runtime, isolation, resource usage, file hashes and actual cost.
- Batch processing — Submit up to 1,000 jobs in one batch with concurrency control and dependency chaining.
- Native MCP integration — Connect via a single URL to ChatGPT, Claude and any MCP client without API keys.
- Fast start for WASM — WebAssembly jobs start in milliseconds, no VM boot time.
- Automatic lifecycle — Handles retries, timeouts, cleanup and sandbox disposal automatically.
- EU-operated servers — Runs on refurbished enterprise hardware located in the EU.
Use cases
- Run untrusted code from a coding agent in a disposable Linux VM.
- Process thousands of independent data-transform tasks with batch jobs.
- Execute short, network-free computations via WASI for low-latency scoring.
- Automate browser-based workflows in a sandboxed real browser environment.
- Audit AI-generated code execution with detailed receipts for compliance.
WBX Sandbox pricing
- Free$0.002 concurrent sandboxes · Up to 1 hour per sandbox · MCP, Python SDK, REST API · Community support
- Pro$55.00/month25 concurrent sandboxes · Up to 24 hours per sandbox · Background jobs, batches, artifacts · Execution receipts and budget limits
- Team$119.00/month100 concurrent sandboxes · Up to 48 hours per sandbox · All Pro features · Team members with roles
WBX Sandbox vs alternatives
 WBX Sandbox |  LangChain |  LlamaIndex |  n8n |  Mastra | |
|---|---|---|---|---|---|
| Best for | Secure sandboxes for AI agents | LLM app framework | Data-centric agent apps | No-code workflow automation | TypeScript agent framework |
| Pricing | Freemium | Free | Free | Subscription | Free |
| DevHunt upvotes | 0 | 0 | 0 | 0 | 0 |
| Launched | Nov 2026 | — | — | — | — |
- WBX Sandbox vs LangChain: LangChain provides a programming framework for LLM apps but not isolated execution environments.
- WBX Sandbox vs LlamaIndex: LlamaIndex focuses on data indexing for agents, not sandboxed code execution.
- WBX Sandbox vs n8n: n8n offers workflow automation with integrations, lacking secure microVM or WASM sandboxes.
- WBX Sandbox vs Mastra: Mastra is a TypeScript framework for building agents, not a runtime sandbox service.
WBX Sandbox FAQ
What happens when my credit runs out?+
New sandboxes stop starting and you are emailed; running sandboxes finish normally. You can enable automatic top-up.
Can I change plans?+
Upgrades take effect immediately; downgrades and cancellations apply at the end of the current paid month.
How do I pay?+
Payments are made by card via Stripe or GoPay for EU customers, with a VAT invoice provided.
Do you offer dedicated servers?+
Yes, Enterprise customers can reserve servers exclusively for their organization with custom terms.
Do budget limits cover everything?+
Budget Guard applies to background jobs and batches; sandbox usage is billed by consumption and stops when credit is exhausted.
Edited by the makers, based on sandbox.wbx.cz · Nov 9, 2026. Details may change; check the official site.
