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1

Open Cascade

Click the Cascade icon (the AI assistant panel).
2

Open MCP config

Click the hammer icon at the top of the Cascade panel, then click Configure.
3

Add the server

Add the OpenFinance server inside the mcpServers object:
{
  "mcpServers": {
    "openfinance-tech": {
      "serverUrl": "https://api.openfinance.tech/agent/mcp",
      "headers": {
        "x-api-key": "open_xxxxx"
      }
    }
  }
}
Drop the headers object if you only need public tools.
4

Refresh

Save the file. Click the Refresh button next to the MCP server list, or restart Windsurf.
5

Verify

OpenFinance should appear in the server list as connected.
Windsurf uses serverUrl instead of url. This is different from most other clients.