LangChain

Fatstack for LangChain

net.fatstack/registry

Paid MCP tools behind one endpoint. Agents pay per call in USDC on Base via x402.

client:LangChain transport:streamable-http tools:14

Install Fatstack in LangChain

pip install langchain-mcp-adapters

from langchain_mcp_adapters.client import MultiServerMCPClient

client = MultiServerMCPClient({
        "registry": {
            "transport": "streamable_http",
            "url": "https://www.fatstack.net/api/mcp",
        }
})

tools = await client.get_tools()

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

What LangChain can do once it is connected

Fatstack in other clients

Fatstack MCP server