OpenAI Responses API

First-class MCP tool type.

Building your own GPT-powered app with the OpenAI API? Register BankBridge as an MCP tool — OpenAI proxies the tool calls server-side. No client-side MCP runtime needed.

Step 01

Add the tool to your request.

POST /v1/responses

{
  "model": "gpt-4.1",
  "input": "How much did I spend on restaurants last month?",
  "tools": [
    {
      "type": "mcp",
      "server_label": "bankbridge",
      "server_url": "https://bankbridge.money/api/mcp",
      "headers": {
        "Authorization": "Bearer ldgr_your_api_key_here"
      },
      "require_approval": "never"
    }
  ]
}

Replace ldgr_your_api_key_here with a real key from your keys page.

Step 02

There is no step 2.

OpenAI fetches the tool list from BankBridge, lets the model call tools as needed, and streams results back. No MCP client code on your side.

What about per-user keys?

If you’re shipping a consumer app where each user should link their own bank, pass their BankBridge API key in the Authorization header per-request. Your app holds one key per user (collect at signup or via an “Connect BankBridge” button that deep-links to our dashboard).

Problems? Email hello@bankbridge.money.