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Turn your MCP tools into a revenue stream with pay-per-call pricing without building billing, authentication, or account management. ATXP lets you require payment before execution, so you get predictable income with minimal overhead.

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Why use ATXP for MCP servers?

  • Earn per-use: Charge per tool call with flexible pricing.
  • Programmatic enforcement: Require payment before execution with a single router and helper.
  • No user accounts or API keys: Agents pay from their own wallets; you don’t manage users, keys, or invoices.
  • Works everywhere: Compatible with major hosts (e.g., Claude, Goose), local dev, and your own infrastructure.

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Build your first monetized MCP server

1

Install the library

Install the ATXP express SDK in your project:
npm install @atxp/express
2

Set up your wallet

Create an ATXP account and set your wallet address in an environment variable. The best way to do this is to create a .env file in the root of your project and add the following line:
.env
ATXP_CONNECTION=<YOUR_ATXP_CONNECTION_STRING>
Never commit wallet address to version control. It is a good idea to add your .env to your .gitignore file to prevent it from being committed.
echo .env >> .gitignore
3

Integrate with your MCP server

Add the ATXP Express router to your MCP server:
// Import the ATXP SDK and other dependencies
import { atxpExpress, requirePayment, ATXPAccount } from '@atxp/express';  
import BigNumber from "bignumber.js"; 

// Create your MCP server
const server = new McpServer();

// Define your MCP tools...
// server.tool(...);

// Create and configure your Express server
const app = express()
app.use(express.json())

// Read your wallet ID from the environment variable
const ATXP_CONNECTION = process.env.ATXP_CONNECTION

// Add the ATXP payment router
app.use(atxpExpress({ 
  destination: new ATXPAccount(ATXP_CONNECTION), // Your connection string
  payeeName: 'Your Server Name',    // The name of your MCP server
}))  

// Other MCP server configuration...
4

Add payment requirements to tools

In each MCP tool exposed by your server that you want to charge per-use for, require payment before tool execution:
server.tool(
  "upcase",
  "Convert the provided string to uppercase",
  {
    text: z.string().describe("The text to convert to uppercase"),
  },
  async ({ text }) => {
    // Require payment (in USDC) for the tool call
    await requirePayment({price: BigNumber(0.01)}); 

    // Your tool's logic
    const result = text.toUpperCase();

    // Return the result of the tool call
    return {
      content: [
        {
          type: "text",
          text: result,
        },
      ],
    };
  }
);
5

Connect to your MCP server

Deploy your changes and connect to your MCP server with a host such as Goose or Claude to start paying for tool calls.
Running your MCP server locally? See on how to connect to a local MCP server.

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Resources

Monetized MCP tutorial

Follow a complete tutorial to build your first paid MCP server with ATXP integration, from initial setup to live deployment.

Build an agent using paid MCP servers

Get started building an ATXP‑powered agent that pays for MCP server tool calls.

Join the community

Join the ATXP community on Discord to ask questions, share your projects, and get help from the team.