blackwall x402 guardrail for LangChain
com.blackwalltier/blackwall-x402-guardrail
Keyless hosted MCP: pre-signature x402 payment verdict (GO/HOLD/STOP) with a signed receipt.
client:LangChain
transport:streamable-http
tools:1
Install blackwall x402 guardrail in LangChain
pip install langchain-mcp-adapters
from langchain_mcp_adapters.client import MultiServerMCPClient
client = MultiServerMCPClient({
"blackwall-x402-guardrail": {
"transport": "streamable_http",
"url": "https://mcp.blackwalltier.com",
}
})
tools = await client.get_tools()
get_tools() returns the server's tools as LangChain tools, ready for an agent. LangChain docs