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mcp/harbor
LangChain

PayStage Preflight for LangChain

io.github.base-buzz/preflight

Evaluate x402 PaymentRequired against a local spending policy before an agent pays

client:LangChain transport:stdio runtime:npm

Install PayStage Preflight in LangChain

pip install langchain-mcp-adapters 

from langchain_mcp_adapters.client import MultiServerMCPClient

client = MultiServerMCPClient({
        "preflight": {
            "transport": "stdio",
            "command": "npx",
            "args": ["-y", "@paystage/preflight"],
        }
})

tools = await client.get_tools()

get_tools() returns the server's tools as LangChain tools, ready for an agent. LangChain docs

PayStage Preflight in other clients

PayStage Preflight MCP server