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LangChain

SendCheck — EVM address verification (x402) for LangChain

org.pennyforge.api/sendcheck

Pre-send EVM address checks: free pre-check, $0.01 check, $0.05 deep scan. x402: payment is auth.

client:LangChain transport:streamable-http tools:3

Install SendCheck — EVM address verification (x402) in LangChain

pip install langchain-mcp-adapters

from langchain_mcp_adapters.client import MultiServerMCPClient

client = MultiServerMCPClient({
        "sendcheck": {
            "transport": "streamable_http",
            "url": "https://api.pennyforge.org/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

SendCheck — EVM address verification (x402) in other clients