# `sandbox_capacity_reached`

A Multiplayer API error, sent with HTTP 503. Status: the Multiplayer API is in private alpha; this code is part of its published contract.

## When

All sandboxes together are at their ceiling. The answer carries `retryAfterSec`.

## What to do

Try again in an hour, or request an alpha key at https://lobbylab.gg/developers.

## The answer

Every error is a JSON body with a stable `error` code. Clients act on the codes they know and treat any other code as a failure of its HTTP status, and keep fields they do not know.

```json
{
  "error": "sandbox_capacity_reached",
  "detail": "A sentence that is safe to show.",
  "next": "Try again in an hour, or request an alpha key at https://lobbylab.gg/developers.",
  "docsUrl": "https://lobbylab.gg/docs/errors/sandbox_capacity_reached",
  "retryAfterSec": 60
}
```

This code always carries `retryAfterSec`.

See also: [every error code](/docs/errors), [the API reference](/docs/api) and [the docs](/docs).