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paymcp - npm

Provider‑agnostic payment layer for MCP (Model Context Protocol) tools and agents.

paymcp is a lightweight SDK that helps you add monetization to your MCP‑based tools, servers, or agents. It supports multiple payment providers and integrates seamlessly with MCP's tool / resource interface.

This is the Node / TypeScript port of the original Python paymcp library.
Conceptually the same: you mark tools as paid and choose a payment flow.
Implementation details differ (no decorators; price lives in registerTool() config).

• ✅ Add per‑tool price config when you register MCP tools to enable payments.
• 🔁 Choose between different payment flows (Two‑Step confirm, Elicitation, Progress wait).
• 🔌 Pluggable support for providers like Walleot, Stripe, and more.
• ⚙️ Easy drop‑in patch: installPayMCP(server, options) — no need to rewrite tools.
• 🛡 Verified server‑side with your payment provider before tool logic runs.

The paymentFlow option controls how the user is guided through payment. Pick what fits your UX & client capabilities.

Splits the tool into two MCP methods.

1. Initiate: original tool returns a payment_url + payment_id + next_step (e.g. confirm_add_payment).
2. Confirm: dynamically registered tool verifies payment (server‑side) and, if paid, runs the original logic.

Works in almost all clients (even very simple ones).

When the tool is called, PayMCP sends the user a payment link via MCP elicitation (if the client supports the capability). The user can Accept / Cancel inline; once paid, the original tool runs in the same call. Falls back to a pending response if elicitation is unsupported.

Keeps the tool call open, shows a payment link, and streams progress updates while polling the provider in the background. Automatically returns the tool result when payment clears (or error / timeout).

Reserved for asynchronous / deferred flows. Not yet implemented.

When in doubt, start with TWO_STEP — highest compatibility.

npm install paymcp
# or
pnpm add paymcp
# or
yarn add paymcp

Requires Node 18+, an MCP server (official SDK or compatible), and at least one payment provider API key.

import { Server } from "@modelcontextprotocol/sdk/server";
const server = new Server({ name: "my-ai-agent", version: "0.0.1" });

import { installPayMCP, PaymentFlow } from "paymcp";

installPayMCP(server, {
  providers: {
    "provider_name": {"apiKey": "your-api-key-here"},
  },
  paymentFlow: PaymentFlow.ELICITATION, // or TWO_STEP / PROGRESS
});

The first provider listed is used by default for priced tools. Multi‑provider selection coming soon.

Specify a price object in the tool config you pass to registerTool().

import { z } from "zod";

server.registerTool(
  "add",
  {
    title: "Add",
    description: "Add two numbers. This is a paid function.",
    inputSchema: {
      a: z.number(),
      b: z.number(),
    },
    price: { amount: 0.19, currency: "USD" },
  },
  async ({ a, b }, extra) => {
    // `extra` is required by the PayMCP tool signature — include it even if unused
    return {
      content: [{ type: "text", text: String(a + b) }],
    };
  }
);

Start your MCP transport (stdio / http / ws) as usual. Any MCP client that connects will see the tool (and—depending on flow—be prompted to pay).

Demo server: For a complete setup (Express + Streamable HTTP), see the example repo: node-paymcp-server-demo.

• ✅ Walleot – Simple payment session API (create + poll).
• ✅ Stripe Checkout – Redirect / hosted checkout; poll payment_status.
• 🔜 More providers welcome! Open an issue or PR.

Every provider implements two methods:

interface PaymentProvider {
  createPayment(
    amount: number,
    currency: string,
    description: string
  ): Promise<{ paymentId: string; paymentUrl: string }>;

  getPaymentStatus(paymentId: string): Promise<string>; // \"paid\" | \"pending\" | \"canceled\" | ...
}

See src/providers/walleot.ts and src/providers/stripe.ts for examples. Add yours, export it from the provider map, and pass config to installPayMCP().

• In‑memory state: Two‑Step flow stores pending args in a process‑local Map. Use Redis (or similar) in production if you need durability or horizontal scaling.
• Always include content in tool results to satisfy strict MCP clients (Pydantic validation).

MIT License

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