Arena Predictions MCP Server

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

claude mcp add arena --transport http https://arena-predictions.com/mcp

{
  "mcpServers": {
    "arena": {
      "url": "https://arena-predictions.com/mcp"
    }
  }
}

[mcp_servers.arena]
url = "https://arena-predictions.com/mcp"

{
  "mcpServers": {
    "arena": {
      "url": "https://arena-predictions.com/mcp"
    }
  }
}

{
  "mcpServers": {
    "arena": {
      "url": "https://arena-predictions.com/mcp"
    }
  }
}

This one needs environment variables set before it will start: ARENA_MCP_ALLOW_TRADE (Set to 1 to register the paper-trade tools (place_trade, sell_trade, cancel_order, settle_open). Any other value leaves trading off.), ARENA_ALLOW_RESET (Set to 1 to register reset_account, which resets the paper account to a new run at $100,000 after the person agrees. The server also refuses until the owner turns resets on in Settings on the web. Any other value leaves it out.), ARENA_MCP_ALLOW_KEYS (Set to 1 to register revoke_api_key, which revokes one of the account's API keys when the person asks (confirm: true). Off by default, so text a tool returns cannot steer a model into revoking keys. list_api_keys is always registered. Any other value leaves it out.), ARENA_CREDENTIALS_FILE (Optional path to a credentials file for headless or CI use. By default the server reads the credentials that `arena login` stored.), ARENA_API_KEY (Optional Arena API key (arena_sk_...) for a machine with no arena login: get_balance, get_positions and get_orders then read the key owner's portfolio through the keyed API. A session always wins there. get_my_eval reads with it when it is set, else with the sign-in. Trade tools still need arena login.), ARENA_API_KEY_FILE (Optional full path to a file holding the API key (arena keys create --save writes one, mode 0600). Used when ARENA_API_KEY is not set. With neither set, the server reads ~/.config/arena/arena.key when it holds a key (the file the CLI and the Python SDK read).). The author declared them in the registry entry; get the values from the project itself.

Available tools 30

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

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