How do I install Arena Predictions?

Pick a client above and copy the generated config. Cursor and VS Code also have a deep link when the server can run locally or remotely.

Is Arena Predictions official?

No. Registry-listed is not the same as vendor-official. Read the methodology for the difference.

How is the trust score calculated?

This listing scores 40 (Fair). The formula is published on the methodology page.

MCPpedia

Arena Predictions MCP Server | MCPpedia

Arena Predictions MCP Server

Name: Arena Predictions MCP Server
Author: zbgc

Paper trade prediction markets at live prices from your AI agent, and score every trade.

Tools Versions Alternatives

RegistryRemotezbgc

40Fair

Install

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "arena-predictions-arena": {
      "command": "npx",
      "args": [
        "-y",
        "arena-mcp-server@0.6.0"
      ],
      "env": {
        "ARENA_MCP_ALLOW_TRADE": "0",
        "ARENA_ALLOW_RESET": "0",
        "ARENA_MCP_ALLOW_KEYS": "0",
        "ARENA_CREDENTIALS_FILE": "",
        "ARENA_API_KEY": "YOUR_ARENA_API_KEY",
        "ARENA_API_KEY_FILE": ""
      }
    }
  }
}

Install guide

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Environment

Name	Required	Notes
ARENA_MCP_ALLOW_TRADE	No	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	No	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	No	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	No	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	No	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. Secret.
ARENA_API_KEY_FILE	No	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).

Arena Predictions MCP Server

Install

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