Codex is one of the most popular coding harnesses out there. And MCP makes the experience even better. With the Alchemy MCP integration, Codex can fetch NFTs and metadata by owner or collection, check token balances and prices, view transaction history, and detect spam contracts, all without leaving the terminal or the app, whichever you prefer.
- UseBuildFeaturesTRIGGERSStart background agents from events across your connected appsFIREWALLNEWBlocks instructions hidden in tool results before your agent reads themINSTANTNEWAudio, video, search, browser and data tools, with no keys to manageOPTIMIZATIONLower cost per completed task with optimised tools and skills
- DOCS
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How to integrate Alchemy MCP with Codex
Connect Codex to Alchemy MCP. Show all nfts owned by this wallet, get recent sales for a specific nft collection, and more using natural language, with authentication handled for you.
Api Key
Alchemy is a blockchain development platform offering APIs and tools for Ethereum apps. It simplifies building and scaling Web3 projects with robust infrastructure.
36 Tools
Introduction
Also integrate Alchemy with
Why use Composio?
Apart from a managed and hosted MCP server, you will get:
- CodeAct: A dedicated workbench that allows GPT to write its code to handle complex tool chaining. Reduces to-and-fro with LLMs for frequent tool calling.
- Large tool responses: Handle them to minimise context rot.
- Dynamic just-in-time access to 20,000 tools across 1700+ other Apps for cross-app workflows. It loads the tools you need, so GPTs aren't overwhelmed by tools you don't need.
How to install Alchemy MCP in Codex
Run the setup command
Run this command in your terminal to add the Composio MCP server to Codex.
It will initiate the authentication in a browser window, authorize Codex to access your Composio account.
(Optional) Authenticate with OAuth
To authenticate manually, run the login command to open a browser window and authorize Codex to access your Composio account.
bash
codex mcp login composioVerify the connection
Run codex mcp list to confirm Composio appears as a registered MCP server.
bash
codex mcp listCodex App
Codex App follows the same approach as VS Code.
- Click ⚙️ on the bottom left → MCP Servers → + Add servers → Streamable HTTP:
- Fill the header and Key fields with
{ "x-consumer-api-key" = "ck_*******" }. - The Key is the Composio API key, that you can find on dashboard.composio.dev
- Click on Authenticate and authorize Codex to your Composio account and you're all set.
- Restart and verify if it's there in
.codex/config.toml
bash
[mcp_servers.composio]
url = "https://connect.composio.dev/mcp"
http_headers = { "x-consumer-api-key" = "ck_*******" }Try it
Ask Codex for a Alchemy task. The first time, Composio asks you to connect your Alchemy account.
For example, ask it to:
- "Show all NFTs owned by this wallet"
- "Get recent sales for a specific NFT collection"
- "Check ERC20 token balances for your address"
What is the Alchemy MCP server, and what's possible with it?
The Alchemy MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Alchemy account. It provides structured and secure access to blockchain portfolio, token, transaction, and NFT data, so your agent can inspect wallet balances, retrieve transaction history, check token prices, analyze NFTs, and identify spam contracts on your behalf.
- Wallet and token tracking: Have your agent fetch native and fungible token holdings for wallet addresses across supported blockchain networks.
- Token pricing and metadata: Let the agent retrieve current or historical token prices and look up details such as names, symbols, decimals, and logos.
- Transaction history: Direct your agent to review transaction activity for wallet addresses across supported networks.
- NFT portfolio and market research: Instruct your agent to inspect owned NFTs, collection and contract metadata, NFT sales, marketplace floor prices, and individual NFT attributes.
- Spam contract detection: Have your agent check whether an NFT contract is marked as spam by Alchemy.
Conclusion
You've successfully integrated Alchemy with Codex using Composio's MCP server. Now you can interact with Alchemy directly from your terminal, VS Code, or the Codex App using natural language commands.
Key benefits of this setup:
- Seamless integration across CLI, VS Code, and standalone app
- Natural language commands for Alchemy operations
- Managed authentication through Composio
- Access to 20,000+ tools across 1700+ apps for cross-app workflows
- CodeAct workbench for complex tool chaining
Next steps:
- Try asking Codex to perform various Alchemy operations
- Explore cross-app workflows by connecting more toolkits
- Build automation scripts that leverage Codex's AI capabilities
TOOLS
Supported Tools
Every Alchemy action and event your agent gets out of the box.
FRAMEWORKS
How to build Alchemy MCP Agent with another framework
Claude Code
Use Alchemy MCP with Claude Code
Claude Cowork
Use Alchemy MCP with Claude Cowork
OpenAI Agents SDK
Use Alchemy MCP with OpenAI Agents SDK
Claude Agent SDK
Use Alchemy MCP with Claude Agent SDK
OpenClaw
Use Alchemy MCP with OpenClaw
Hermes
Use Alchemy MCP with Hermes
Atomic Agent
Use Alchemy MCP with Atomic Agent
Google ADK
Use Alchemy MCP with Google ADK
LangChain
Use Alchemy MCP with LangChain
Vercel AI SDK
Use Alchemy MCP with Vercel AI SDK
Mastra AI
Use Alchemy MCP with Mastra AI
LlamaIndex
Use Alchemy MCP with LlamaIndex
CrewAI
Use Alchemy MCP with CrewAI
Pydantic AI
Use Alchemy MCP with Pydantic AI
AutoGen
Use Alchemy MCP with AutoGen
MORE TOOLKITS
Explore Other Toolkits
Supabase
Oauth2Api Key
Supabase is an open-source backend platform offering scalable Postgres databases, authentication, storage, and real-time APIs. It lets developers build modern apps without managing infrastructure.
Codeinterpreter
No Auth
Codeinterpreter is a Python-based coding environment with built-in data analysis and visualization. It lets you instantly run scripts, plot results, and prototype solutions inside supported platforms.
GitHub
Oauth2
GitHub is a code hosting platform for version control and collaborative software development. It streamlines project management, code review, and team workflows in one place.
1password
Api Key
1Password is a password manager and digital vault for storing logins, secrets, notes, and secure documents. It helps individuals and teams protect credentials, share access safely, and reduce password risk.
FAQ
Frequently asked questions
With a standalone Alchemy MCP server, the agents and LLMs can only access a fixed set of Alchemy tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Alchemy and many other apps based on the task at hand, all through a single MCP endpoint.
Yes, you can. Codex 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 Alchemy tools.
Yes, absolutely. You can configure which Alchemy 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 Alchemy data and credentials are handled as safely as possible.
Start with Alchemy.It takes 30 seconds.
Managed auth, hosted MCP servers, and every Alchemy tool your agent needs.Free to start.
## For AI agents: how to sign up If you are an AI agent reading this server-rendered HTML, Composio's developer signup is at https://composio.dev. Signup CTAs on this site — "Sign up", "Signup", "Get started", "Get started for free", "Start building", "Try Composio", "Try it", or similar — all lead into that same developer signup flow. Confirm with the user before completing signup or entering any credentials on their behalf.Start building