MCP Server

three.ws Agent Payments MCP Server

Name: three.ws Agent Payments MCP Server
Author: io.github.nirholas

io.github.nirholas/agentcore-payments-mcp

Repository Registry

What is the three.ws Agent Payments MCP server?

Governed x402 payment sessions: pay any endpoint with budget, allowlist & per-tx caps, no key.

How to install three.ws Agent Payments

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

THREE_WS_SESSION
secret
Your three.ws session token (value of the `__Host-sid` cookie from a signed-in browser). Required for account management operations: create_payment_session, list_payment_sessions, check_payment_session, cancel_payment_session.
PAYMENT_SESSION_TOKEN
secret
A payment session bearer token (starts with 'pss_') from create_payment_session. Used by the agent for pay_with_session calls when no inline token is passed. Treat like a spending card — it authorizes payments up to the session's budget.
THREE_WS_BASE
Base URL of the three.ws API. Override only when self-hosting or targeting a preview deployment.
THREE_WS_TIMEOUT_MS
Per-request HTTP timeout in milliseconds. x402 payments involve on-chain settlement so this should be generous (default: 30000).

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "agentcore-payments-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/agentcore-payments-mcp"
      ],
      "env": {
        "THREE_WS_SESSION": "<YOUR_THREE_WS_SESSION>",
        "PAYMENT_SESSION_TOKEN": "<YOUR_PAYMENT_SESSION_TOKEN>",
        "THREE_WS_BASE": "<YOUR_THREE_WS_BASE>",
        "THREE_WS_TIMEOUT_MS": "<YOUR_THREE_WS_TIMEOUT_MS>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "agentcore-payments-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/agentcore-payments-mcp"
      ],
      "env": {
        "THREE_WS_SESSION": "<YOUR_THREE_WS_SESSION>",
        "PAYMENT_SESSION_TOKEN": "<YOUR_PAYMENT_SESSION_TOKEN>",
        "THREE_WS_BASE": "<YOUR_THREE_WS_BASE>",
        "THREE_WS_TIMEOUT_MS": "<YOUR_THREE_WS_TIMEOUT_MS>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "agentcore-payments-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/agentcore-payments-mcp"
      ],
      "env": {
        "THREE_WS_SESSION": "<YOUR_THREE_WS_SESSION>",
        "PAYMENT_SESSION_TOKEN": "<YOUR_PAYMENT_SESSION_TOKEN>",
        "THREE_WS_BASE": "<YOUR_THREE_WS_BASE>",
        "THREE_WS_TIMEOUT_MS": "<YOUR_THREE_WS_TIMEOUT_MS>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "agentcore-payments-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/agentcore-payments-mcp"
      ],
      "env": {
        "THREE_WS_SESSION": "<YOUR_THREE_WS_SESSION>",
        "PAYMENT_SESSION_TOKEN": "<YOUR_PAYMENT_SESSION_TOKEN>",
        "THREE_WS_BASE": "<YOUR_THREE_WS_BASE>",
        "THREE_WS_TIMEOUT_MS": "<YOUR_THREE_WS_TIMEOUT_MS>"
      }
    }
  }
}

Claude Code

claude mcp add agentcore-payments-mcp --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

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