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Showing content from https://github.com/blustAI/paymcp below:

blustAI/paymcp: Provider-agnostic payment layer for MCP (Model Context Protocol) tools and agents.

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.

• ✅ Add @price(...) decorators to your MCP tools to enable payments
• 🔁 Choose between different payment flows (elicit, confirm, etc.)
• 🔌 Pluggable support for providers like Walleot, Stripe, and more
• ⚙️ Easy integration with FastMCP or other MCP servers

The payment_flow parameter controls how the user is guided through the payment process. Choose the strategy that fits your use case:

• PaymentFlow.TWO_STEP (default)
  Splits the tool into two separate MCP methods.
  The first step returns a payment_url and a next_step method for confirmation.
  The second method (e.g. confirm_add_payment) verifies payment and runs the original logic.
  Supported in most clients.

• PaymentFlow.ELICITATION Sends the user a payment link when the tool is invoked. If the client supports it, a payment UI is displayed immediately. Once the user completes payment, the tool proceeds.

• PaymentFlow.PROGRESS
  Shows payment link and a progress indicator while the system waits for payment confirmation in the background. The result is returned automatically once payment is completed.

• PaymentFlow.OOB (Out-of-Band)
  Not yet implemented.

All flows require the MCP client to support the corresponding interaction pattern. When in doubt, start with TWO_STEP.

Install the SDK from PyPI:

Initialize PayMCP:

from mcp.server.fastmcp import FastMCP, Context
from paymcp import PayMCP, price, PaymentFlow

mcp = FastMCP("AI agent name")
PayMCP(
    mcp,  # your FastMCP instance
    providers={
        "provider_name": {"apiKey": "your-api-key-here"},
    },
    payment_flow=PaymentFlow.ELICITATION
)

Use the @price decorator on any tool:

@mcp.tool()
@price(amount=0.19, currency="USD")
def add(a: int, b: int, ctx: Context) -> int:
    # `ctx` is required by the PayMCP tool signature — include it even if unused
    return a + b

Demo server: For a complete setup, see the example repo: python-paymcp-server-demo.

• ✅ Walleot
• ✅ Stripe
• 🔜 Want another provider? Open an issue or submit a pull request!

MIT License

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