How to integrate Coinbase MCP with LangChain

This guide walks you through connecting Coinbase to LangChain using the Composio tool router. By the end, you'll have a working Coinbase agent that can show all your coinbase wallet balances, list every crypto wallet i own, display recent wallets added to your account through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Coinbase account through Composio's Coinbase MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Coinbase is a platform for buying, selling, and storing cryptocurrency. It makes exchanging and managing crypto simple and secure for everyone.

28 Tools

Introduction

This guide walks you through connecting Coinbase to LangChain using the Composio tool router. By the end, you'll have a working Coinbase agent that can show all your coinbase wallet balances, list every crypto wallet i own, display recent wallets added to your account through natural language commands.

This guide will help you understand how to give your LangChain agent real control over a Coinbase account through Composio's Coinbase MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Coinbase with

ChatGPTOpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenCodeCursorVS CodeOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your Coinbase project to Composio
  • Create a Tool Router MCP session for Coinbase
  • Initialize an MCP client and retrieve Coinbase tools
  • Build a LangChain agent that can interact with Coinbase
  • Set up an interactive chat interface for testing

What is LangChain?

LangChain is a framework for developing applications powered by language models. It provides tools and abstractions for building agents that can reason, use tools, and maintain conversation context.

Key features include:

  • Agent Framework: Build agents that can use tools and make decisions
  • MCP Integration: Connect to external services through Model Context Protocol adapters
  • Memory Management: Maintain conversation history across interactions
  • Multi-Provider Support: Works with OpenAI, Anthropic, and other LLM providers

What is the Coinbase MCP server, and what's possible with it?

The Coinbase MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Coinbase account. It provides structured and secure access to your cryptocurrency wallets, so your agent can retrieve wallet balances, monitor your digital assets, and help you stay informed about your crypto holdings in real time.

  • Comprehensive wallet listing: Instantly fetch a full list of all your Coinbase wallets, including details for each asset you hold.
  • Balance monitoring: Let your agent check and report the current balances for every cryptocurrency wallet connected to your account.
  • Portfolio overview: Get an at-a-glance summary of your crypto assets, helping you understand your overall digital asset distribution.
  • Streamlined asset visibility: Use your agent to quickly surface wallet addresses, asset types, and wallet-specific metadata for easier tracking and management.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step10 STEPS
1

Prerequisites

Before starting this tutorial, make sure you have:
  • Python 3.10 or higher installed on your system
  • A Composio account with an API key
  • An OpenAI API key
  • Basic familiarity with Python and async programming
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

npm install @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

  • @composio/langchain provides Composio integration for LangChain
  • @langchain/mcp-adapters enables MCP client connections
  • @langchain/core is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your requests to Composio's API
  • COMPOSIO_USER_ID identifies the user for session management
  • OPENAI_API_KEY enables access to OpenAI's language models
5

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();
What's happening:
  • We're importing LangChain's MCP adapter and Composio SDK
  • The dotenv/config import loads environment variables from your .env file
  • This setup prepares the foundation for connecting LangChain with Coinbase functionality through MCP
6

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });
What's happening:
  • We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
  • Creating a Composio instance that will manage our connection to Coinbase tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding
7

Create a Tool Router session

const session = await composio.create(
    userId as string,
    {
        toolkits: ['coinbase']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Coinbase tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned session.mcp.url is the MCP server URL that your agent will use
  • This approach allows the agent to dynamically load and use Coinbase tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "coinbase-agent": {
        transport: "http",
        url: url,
        headers: {
            "x-api-key": process.env.COMPOSIO_API_KEY
        }
    }
});

const tools = await client.getTools();

const agent = createAgent({ model: "gpt-5", tools });
What's happening:
  • We're creating a MultiServerMCPClient that connects to our Coinbase MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Coinbase tools that the agent can use
  • We're creating a LangChain agent using the GPT-5 model
9

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Coinbase related question or task to the agent.\n");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
});

rl.prompt();

rl.on('line', async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
        console.log("\nGoodbye!");
        rl.close();
        process.exit(0);
    }

    if (!trimmedInput) {
        rl.prompt();
        return;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });
What's happening:
  • We initialize an empty conversationHistory list to maintain context across interactions
  • A readline interface is used to continuously accept user input from the command line
  • When a user types a message, it's added to the conversation history and sent to the agent
  • The agent processes the request using the invoke() method with the full conversation history
  • Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully
10

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});
What's happening:
  • We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Coinbase and LangChain:

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";  
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

    const session = await composio.create(
        userId as string,
        {
            toolkits: ['coinbase']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "coinbase-agent": {
            transport: "http",
            url: url,
            headers: {
                "x-api-key": process.env.COMPOSIO_API_KEY
            }
        }
    });
    
    const tools = await client.getTools();
  
    const agent = createAgent({ model: "gpt-5", tools });
    
    let conversationHistory: any[] = [];
    
    console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
    console.log("Ask any Coinbase related question or task to the agent.\n");
    
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'You: '
    });

    rl.prompt();

    rl.on('line', async (userInput: string) => {
        const trimmedInput = userInput.trim();
        
        if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
            console.log("\nGoodbye!");
            rl.close();
            process.exit(0);
        }
        
        if (!trimmedInput) {
            rl.prompt();
            return;
        }
        
        conversationHistory.push({ role: "user", content: trimmedInput });
        console.log("\nAgent is thinking...\n");
        
        const response = await agent.invoke({ messages: conversationHistory });
        conversationHistory = response.messages;
        
        const finalResponse = response.messages[response.messages.length - 1]?.content;
        console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\nSession ended.');
        process.exit(0);
    });
}

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

Conclusion

You've successfully built a LangChain agent that can interact with Coinbase through Composio's Tool Router.

Key features of this implementation:

  • Dynamic tool loading through Composio's Tool Router
  • Conversation history maintenance for context-aware responses
  • Async Python provides clean, efficient execution of agent workflows
You can extend this further by adding error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.
TOOLS

Supported Tools

Every Coinbase action and event your agent gets out of the box.

Get Asset Details

Retrieve detailed information about a specific asset from Coinbase International Exchange.

Get Exchange Currency

Tool to retrieve detailed information about a specific currency from Coinbase Exchange API.

Get Instrument Details

Tool to get complete details for a specific trading instrument on Coinbase International Exchange.

Get Historical Funding Rate

Get historical funding rates for a specific instrument from Coinbase International Exchange.

Get Quote Per Instrument

Tool to get the current quote for a specific trading instrument on Coinbase International Exchange.

Get Daily Trading Volume

Tool to retrieve daily trading volume data for specified instruments on Coinbase International Exchange.

Get Market Product Book

Get the current order book (market depth) for a specific product.

Get Product Details

Tool to retrieve detailed information about a specific product (trading pair) from Coinbase Exchange.

Get Product Order Book

Retrieves the order book for a specific product on Coinbase Exchange.

Get Products Ticker

Tool to get real-time ticker information for a specific product on Coinbase Exchange.

Get Products Volume Summary

Tool to retrieve volume summaries for all trading products on Coinbase Exchange.

Get Public Market Trades

Tool to get public market trades for a specific product (trading pair).

Get Server Time

Tool to retrieve the current server time from Coinbase Advanced Trade API.

Get Supported Networks

Tool to retrieve supported blockchain networks for a specific cryptocurrency asset on Coinbase International Exchange.

Get Wrapped Asset Conversion Rate

Tool to get the current conversion rate for a wrapped asset on Coinbase Exchange.

List Exchange Assets

Tool to retrieve all supported assets from the Coinbase International Exchange.

List All Known Currencies

Tool to get all known currencies from Coinbase Exchange API.

List Exchange Products

Tool to retrieve all known trading pairs from Coinbase Exchange.

List Instruments

Tool to list all instruments available for trading on Coinbase International Exchange.

List Instruments Candles

Tool to retrieve aggregated candle (OHLCV) data for instruments on Coinbase International Exchange.

List Loans Assets

Tool to retrieve all assets available for loans from the Coinbase Exchange.

List Market Products

Tool to list market products from Coinbase Advanced Trade API.

List Product Candles

Tool to retrieve historical candlestick (OHLCV) data for a specific trading product on Coinbase Advanced Trade.

List Product Candles

Tool to retrieve historical candlestick (OHLCV) data for a trading pair.

List Products Stats

Tool to get 24-hour statistics for a product on Coinbase Exchange.

List Products Trades

Tool to retrieve recent trades for a specific product from Coinbase Exchange API.

List Wallets

Retrieve all wallets from Coinbase via the CDP SDK.

List Wrapped Assets

Tool to retrieve all wrapped assets from Coinbase Exchange.

FRAMEWORKS

How to build Coinbase MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Coinbase MCP with ChatGPT

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Coinbase MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Coinbase MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Coinbase MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Coinbase MCP with Claude Cowork

Codex logo

Codex

Use Coinbase MCP with Codex

Cursor logo

Cursor

Use Coinbase MCP with Cursor

OpenClaw logo

OpenClaw

Use Coinbase MCP with OpenClaw

Hermes logo

Hermes

Use Coinbase MCP with Hermes

CLI logo

CLI

Use Coinbase MCP with CLI

Google ADK logo

Google ADK

Use Coinbase MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Coinbase MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Coinbase MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Coinbase MCP with LlamaIndex

CrewAI logo

CrewAI

Use Coinbase MCP with CrewAI

OpenCode logo

OpenCode

Use Coinbase MCP with OpenCode

VS Code logo

VS Code

Use Coinbase MCP with VS Code

FAQ

Frequently asked questions

With a standalone Coinbase MCP server, the agents and LLMs can only access a fixed set of Coinbase tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Coinbase and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. LangChain fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Coinbase tools.

Yes, absolutely. You can configure which Coinbase scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Coinbase data and credentials are handled as safely as possible.

Start with Coinbase.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Coinbase tool your agent needs.Free to start.

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Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

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Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

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CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

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Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

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Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

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Co-Founder, Ingram Technologies