Langchain X402 MCP Server

@ihentrel/x402-scraper-langchain

Protocol-native web scraping utility tool engineered for autonomous AI agents, powered by Coinbase AgentKit, LangChain, and x402 on-chain micro-settlements.

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Key Features & Strategic Positioning

• Zero API Keys Required: Agents discover, pay, and execute scraping requests mid-task without unhandled API key exceptions or rate limits.
• Predictable Operational Cost: Flat $0.02 USDC/request settlement on Base, offering a transparent OpEx alternative to dynamic per-gigabyte proxy services.
• Token-Optimized Markdown: HTML, navigation boilerplate, and DOM elements are automatically stripped into clean, token-dense Markdown to reduce LLM context window costs.
• Asynchronous Queue Resilience: Underpinned by a decoupled better-sqlite3 queue and PM2 worker mesh to prevent payload failures under high concurrency.
• Ecosystem Ready: Native support for Model Context Protocol (MCP) manifests (/mcp.json) and ERC-8004 identity registration on Base.

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Quickstart

1. Installation

npm install @ihentrel/x402-scraper-langchain @coinbase/agentkit @langchain/openai

2. Basic Agent Usage

import { AgentKit, ViemWalletProvider, walletActionProvider } from "@coinbase/agentkit";
import { getLangChainTools } from "@coinbase/agentkit-langchain";
import { ChatOpenAI } from "@langchain/openai";
import { createReactAgent } from "@langchain/langgraph/prebuilt";
import { x402ActionProvider } from "@ihentrel/x402-scraper-langchain";

async function main() {
  const agentKit = await AgentKit.from({
    actionProviders: [walletActionProvider(), x402ActionProvider()],
  });

  const tools = await getLangChainTools(agentKit);
  const agent = createReactAgent({
    llm: new ChatOpenAI({ modelName: "gpt-4o-mini" }),
    tools,
  });

  const response = await agent.invoke({
    messages: [
      {
        role: "user",
        content: "Use the x402 scraper tool to fetch data from https://api.example.com/x402-resource",
      },
    ],
  });

  console.log(response.messages[response.messages.length - 1].content);
}

main();

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Model Context Protocol (MCP) Integration

For drop-in compatibility with MCP clients (e.g., Claude Desktop, Cursor, CrewAI):

{
  "mcpServers": {
    "x402-scraper": {
      "url": "https://raw.githubusercontent.com/ihen404/langchain-x402/main/mcp.json"
    }
  }
}

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On-Chain Verification

• Network: Base Mainnet / Base Sepolia
• Protocol Standard: ERC-8004 Agent Identity
• Settlement Asset: USDC ($0.02 / request)

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License

MIT © Ike Ambrose Hentrel II