Governed x402 payment sessions: pay any endpoint with budget, allowlist & per-tx caps, no key.
To add three.ws Agent Payments to Claude, run the install command below or copy the ready-made config for Claude Code, Claude Desktop, Cursor and VS Code further down. Restart your client after adding it and its tools show up in your next conversation. It needs 4 environment variables, listed below.
Install
npx -y @three-ws/agentcore-payments-mcp@0.1.5Environment variables
THREE_WS_SESSIONSet in your MCP configPAYMENT_SESSION_TOKENSet in your MCP configTHREE_WS_BASESet in your MCP configTHREE_WS_TIMEOUT_MSSet in your MCP configInstall with your client
claude mcp add three-ws-agent-payments --env THREE_WS_SESSION=<YOUR_THREE_WS_SESSION> --env PAYMENT_SESSION_TOKEN=<YOUR_PAYMENT_SESSION_TOKEN> --env THREE_WS_BASE=<YOUR_THREE_WS_BASE> --env THREE_WS_TIMEOUT_MS=<YOUR_THREE_WS_TIMEOUT_MS> -- npx -y @three-ws/agentcore-payments-mcp@0.1.5
Run this in a terminal to add the server to Claude Code.
What this does
three.ws Agent Payments exposes a set of tools to Claude over the Model Context Protocol. After you add it to claude_desktop_config.json (snippet above) and restart Claude Desktop, those tools become callable inside any conversation.
Requirements
This server needs the following environment variables to be set before it can run:
THREE_WS_SESSION PAYMENT_SESSION_TOKEN THREE_WS_BASE THREE_WS_TIMEOUT_MS
Set these via the env object in your MCP config (see claude_desktop_config.json snippet above).
Frequently asked questions
How do I install three.ws Agent Payments?
Run the Claude Code command in the install section to add three.ws Agent Payments to Claude Code, or copy the ready-made config for your client from the install section on this page. Restart your client afterwards and the tools appear in your next conversation.
Which clients work with three.ws Agent Payments?
This page carries setup and config for Claude Code, Claude Desktop, Cursor and VS Code. Any other MCP client that accepts a standard server config can connect to three.ws Agent Payments as well.
Does three.ws Agent Payments need an API key?
Yes. Before it can run, set these environment variables: THREE_WS_SESSION, PAYMENT_SESSION_TOKEN, THREE_WS_BASE, THREE_WS_TIMEOUT_MS. They go in the env block of your MCP config.
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