Mantic MCP Server

Mantic is an AI forecasting system that predicts global events — geopolitics, business, policy, markets, technology, and culture — producing probabilistic forecasts with explicit reasoning, updated as new information emerges.

The Mantic MCP (Model Context Protocol) server lets AI assistants such as Claude explore those forecasts directly: search questions, inspect the latest forecast and its reasoning, and follow how a prediction evolved over time.

Connection details
Server URL https://api.mantic.com/mcp
Transport Streamable HTTP
Authentication OAuth — sign in with your Mantic account

Access requires a Mantic account. You see the same questions and dashboards through MCP that your account can see at app.mantic.com.

Connecting a client

Claude (claude.ai and Claude Desktop)

Install the Mantic plugin, which adds the MCP server and skills that help Claude find and explain forecasts:

  1. Open Customize → Plugins.
  2. Choose Add → Add marketplace and enter mantic-ai/skills.
  3. Select mantic-mcp, choose Add, then sign in with your Mantic account when prompted.

To add only the MCP server, open Settings → Connectors → Add custom connector, name it Mantic and paste the server URL: https://api.mantic.com/mcp.

Claude Code

Install the Mantic plugin:

claude plugin marketplace add mantic-ai/skills
claude plugin install mantic-mcp@mantic

To add only the MCP server instead:

claude mcp add --transport http mantic https://api.mantic.com/mcp

Either way, run /mcp inside Claude Code to complete the sign-in flow.

ChatGPT

Install Mantic from the ChatGPT marketplace, then sign in with your Mantic account when prompted.

To add the skills as well, install the Mantic plugin in the ChatGPT desktop app:

  1. Open Plugins and choose Add marketplace → Add from a repository.
  2. Enter mantic-ai/skills.
  3. Install mantic-mcp from the Mantic marketplace and sign in with your Mantic account.

Workspace admins can add the marketplace for everyone from Admin → Plugins → Add → Import marketplace, using https://github.com/mantic-ai/skills.

Codex

Install the Mantic plugin, which adds the MCP server and its skills:

codex plugin marketplace add mantic-ai/skills
codex plugin add mantic-mcp@mantic

If Codex doesn't prompt you to sign in, run codex mcp login mantic.

To add only the MCP server:

codex mcp add mantic --url https://api.mantic.com/mcp
codex mcp login mantic

Or configure it directly in ~/.codex/config.toml:

[mcp_servers.mantic]
url = "https://api.mantic.com/mcp"

Other MCP clients

Any client that supports Streamable HTTP with OAuth works. A typical JSON configuration (e.g. Cursor):

{
  "mcpServers": {
    "mantic": {
      "url": "https://api.mantic.com/mcp"
    }
  }
}

The server advertises its authorization server via standard OAuth discovery, so compliant clients handle the sign-in flow automatically. If a session starts returning authentication errors, re-authenticate from your client's MCP/connector settings.