How to Use the Brex MCP in Claude

Q: How do I configure Brex inside Claude Desktop?

You add the server configuration to your claudedesktopconfig.json file. This registers the MCP Server on your machine. Once saved, restart Claude Desktop, and you will see the tools available via the hammer icon in your chat window.

Q: How do I check my available cash balance?

Ask your agent to verify your funds. It will invoke the brexgetbalance tool and display the real-time cash balance of your corporate accounts directly in the chat.

Issue virtual cards and check cash balances directly inside Claude Desktop without leaving your chat.

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Connect Brex MCP to Claude Desktop

Create your Vinkius account to connect Brex to Claude Desktop and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Brex with Claude Desktop

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Spin up virtual cards inside Claude Desktop

The `brex_create_card` tool allows your agent to spin up virtual cards for SaaS subscriptions right from your desktop chat interface. You don't have to log into the corporate dashboard, fill out forms, or wait for approval chains when buying new developer tools. This MCP Server handles the authentication, so Claude Desktop reads your prompt, calls the card creation endpoint, and returns the active card details. Your agent can immediately use these details to configure local config files or update environment variables on your machine.

Invite new hires to Brex from your chat

The `brex_create_user` tool lets you add team members to your corporate account using only their email and name. This makes onboarding new hires a quick chat command instead of a manual HR ticket. This MCP Server works via your local configuration file, letting Claude Desktop query existing users with `brex_list_users` to prevent duplicate accounts. You get a clean list of active team members in your chat window without opening a browser.

Track corporate spend in Claude Desktop

The `brex_get_balance` tool pulls your live cash account balances directly into your desktop workspace. You always know exactly how much capital is available before approving any new vendor payments. Combine this with `brex_list_budgets` to see how much room remains in specific team budgets before issuing new cards. Claude Desktop parses the raw financial data and presents a clear summary of your company's fiscal health.

Setup guide

Set up Brex MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The Brex MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the Brex MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under brex-mcp.

json

{
  "mcpServers": {
    "brex-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Brex. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about Brex MCP in Claude Desktop

You add the server configuration to your `claude_desktop_config.json` file. This registers the MCP Server on your machine. Once saved, restart Claude Desktop, and you will see the tools available via the hammer icon in your chat window.

Only when you explicitly tell it to do so. Your agent uses the `brex_create_card` tool based on your direct chat prompt, ensuring you maintain full control over when virtual cards are generated.

Yes, you can configure it on both. Use the local JSON configuration for the desktop app, or add the remote server URL as a custom connector in your browser settings on Claude Web.

Ask your agent to verify your funds. It will invoke the `brex_get_balance` tool and display the real-time cash balance of your corporate accounts directly in the chat.

Your cash balances and card details never touch third-party servers. The MCP Server routes your requests directly to the secure API using your local credential token, keeping your sensitive corporate financial information entirely within your local sandbox environment.

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