modal

Modal Sandboxes

Disposable remote containers (with optional GPU) via Modal, paid per call in USDC. No Modal account, no GPU procurement.

Base only. sol.blockrun.ai carries the /v1/modal/* routes but has no Modal backend configured, so every action — create, exec, status, terminate — answers 503. That reads as "the sandbox service is down" rather than "wrong chain", which is exactly the wrong conclusion to act on: retrying will not help. The tool checks the active chain first and says so. Switch with blockrun_wallet action:"chain" chain:"base". Prices below are Base prices and include its per-transaction fee.

READ THIS BEFORE SETTING timeout

timeout is the BILLED lifetime, charged upfront in full, and never refunded — not an idle timeout. Above 300s the price switches from a flat rate to per-hour billing for the entire duration you ask for, whether you use it or not. Terminating early refunds nothing.

That makes timeout the single most expensive field in this MCP:

what you ask for	what you pay
{ timeout: 300 }	$0.0110
{ timeout: 300, gpu: "A100" }	$0.2010
{ timeout: 600, gpu: "A100" }	$0.6677
{ timeout: 86400, gpu: "H100" }	$192.0010

All four are live-verified quotes. A 24h H100 sandbox costs $192 upfront, non-refundable, even if your job finishes in a minute.

So: ask for the time you need, not a safe-looking ceiling. Need 20 minutes of H100? timeout: 1200 is $2.67, not $192. Keep timeout ≤ 300 and you stay on the flat rate entirely.

How to Call from MCP

// 1. Create — timeout: 300 keeps you on the FLAT rate ($0.0110, or $0.2010 with A100).
//    Anything above 300 bills hourly for the full requested lifetime, no refund.
blockrun_modal({ path: "sandbox/create", body: {
  image: "python:3.11",
  gpu: "A100",
  timeout: 300,
  setup_commands: ["pip install torch transformers"]
}})
// returns { sandbox_id, ... }

// 2. Exec
blockrun_modal({ path: "sandbox/exec", body: {
  sandbox_id: "sb_abc...",
  command: ["python", "-c", "import torch; print(torch.cuda.get_device_name(0))"]
}})

// 3. Terminate
blockrun_modal({ path: "sandbox/terminate", body: { sandbox_id: "sb_abc..." } })