Install IBM Granite via x402 in Claude Code

What you need first

• Claude Code, installed.
• Node.js, which gives the npx command the server starts with.
• Your own values for YOUR_MCP_SVM_PAYMENT_ADDRESS,YOUR_WATSONX_API_KEY.

Steps

1. Run this in a terminal, in the project folder. It adds the server for you in that project; put --scope user after claude mcp add to have it in every project.

claude mcp add --env MCP_SVM_PAYMENT_ADDRESS=YOUR_MCP_SVM_PAYMENT_ADDRESS --env WATSONX_API_KEY=YOUR_WATSONX_API_KEY --transport stdio ibm-x402-mcp -- npx -y @three-ws/[email protected]

2. Replace YOUR_MCP_SVM_PAYMENT_ADDRESS,YOUR_WATSONX_API_KEY with your own values.
3. Start Claude Code and type /mcp: the server is listed with its state.

Check it worked

Ask Claude Code: List the tools of ibm-x402-mcp.

If it does not start

spawn npx ENOENT

Node.js is not on the PATH that Claude Code sees. Install it, or write the full path of npx in the config.

The server starts, but its tools fail

A YOUR_… placeholder is still in the config, or its value is wrong.