How to connect Blocknative to Claude Cowork

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks. This guide walks you through the easiest and most secure way to connect your Blocknative account to Cowork via Composio Connect, enabling it to monitor transaction status for a given hash, fetch current Ethereum gas price distribution, list all supported blockchains for monitoring, and more such actions on your behalf without compromising your account security.

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Blocknative

Api Key

Blocknative delivers real-time mempool monitoring and transaction management for public blockchains. Instantly track pending transactions and optimize blockchain interactions with live data.

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Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.

This guide walks you through the easiest and most secure way to connect your Blocknative account to Cowork via Composio Connect, enabling it to monitor transaction status for a given hash, fetch current Ethereum gas price distribution, list all supported blockchains for monitoring, and more such actions on your behalf without compromising your account security.

Also integrate Blocknative with

OpenAI Agents SDK Claude Agent SDK Claude Code Codex OpenClaw Hermes CLI Google ADK LangChain Vercel AI SDK Mastra AI LlamaIndex CrewAI

Connecting Blocknative to Claude Cowork

1. Open Customize

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

2. Add the Composio MCP server

Click Add custom connector and paste in the Composio MCP server URL:

bash

https://connect.composio.dev/mcp

Add custom connector dialog with Composio MCP server URL

3. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Cowork

4. Connect your Blocknative account

Back in Cowork, ask the agent to connect to Blocknative or give it any Blocknative-related task.

For example, ask Cowork to:

"Monitor transaction status for a given hash"
"Fetch current Ethereum gas price distribution"
"List all supported blockchains for monitoring"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Cowork, and your Blocknative account is ready to use.

What is Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.

With Composio Connect, Cowork can securely access apps like Blocknative through MCP without you sharing account credentials directly with the agent.

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

The Blocknative MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Blocknative account. It provides structured and secure access to real-time mempool data and transaction management features across public blockchains, so your agent can monitor transactions, analyze gas prices, configure filters, and manage blockchain event subscriptions on your behalf.

Real-time mempool monitoring: Instruct your agent to subscribe to Ethereum transaction hashes or addresses and receive instant updates on their status and events.
Gas price analysis and estimation: Have your agent fetch current gas price distributions, base fee predictions, and inclusion probability estimates to help optimize transaction fees.
Customizable event filters: Let your agent configure advanced mempool filters and ABI decoding, so you can track only the events or transactions that matter to your workflow.
Multichain event subscriptions: Enable your agent to subscribe or unsubscribe to transaction and account events across multiple supported blockchains using the Blocknative multichain SDK.
Supported chain discovery: Ask your agent to list and discover which blockchains and gas oracles are available for monitoring and analytics.

TOOLS

Supported Tools

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

Configure Mempool Filters

Tool to configure filters and ABI decoding for Ethereum mempool transactions.

Get Gas Price Distribution

Tool to retrieve the current mempool gas price distribution breakdown.

Get Gas Oracles

Tool to retrieve metadata on supported gas oracles per chain.

Get Gas Prices

Tool to fetch gas price estimates for specific inclusion probabilities.

Get Supported Chains

Tool to retrieve supported chains metadata.

Get Base Fee Estimates

Get real-time gas fee predictions for Ethereum mainnet's next 5 blocks.

Subscribe Multichain

Generate WebSocket connection details to subscribe to real-time blockchain events (transactions or account activity) across multiple chains via Blocknative's Multichain API.

Subscribe Transaction Hash

Tool to subscribe to transaction state change events of an Ethereum transaction hash.

Unsubscribe Multichain

Tool to unsubscribe from events across multiple chains using the Multichain SDK.

Unsubscribe Transaction Hash

Tool to unsubscribe from transaction state change events for an Ethereum transaction hash.

FRAMEWORKS

How to build Blocknative MCP Agent with another framework

OpenAI Agents SDK

Use Blocknative MCP with OpenAI Agents SDK

Claude Agent SDK

Use Blocknative MCP with Claude Agent SDK

Claude Code

Use Blocknative MCP with Claude Code

Codex

Use Blocknative MCP with Codex

OpenClaw

Use Blocknative MCP with OpenClaw

Hermes

Use Blocknative MCP with Hermes

CLI

Use Blocknative MCP with CLI

Google ADK

Use Blocknative MCP with Google ADK

LangChain

Use Blocknative MCP with LangChain

Vercel AI SDK

Use Blocknative MCP with Vercel AI SDK

Mastra AI

Use Blocknative MCP with Mastra AI

LlamaIndex

Use Blocknative MCP with LlamaIndex

CrewAI

Use Blocknative MCP with CrewAI

MORE TOOLKITS

Explore Other Toolkits

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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.

Ably

Api Key

Ably is a real-time messaging platform for live chat and data sync in modern apps. It offers global scale and rock-solid reliability for seamless, instant experiences.

FAQ

Frequently asked questions

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

Yes, you can. Claude Cowork 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 Blocknative tools.

Yes, absolutely. You can configure which Blocknative 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 Blocknative data and credentials are handled as safely as possible.

Start with Blocknative.It takes 30 seconds.

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

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Customer stories

Teams ship real agents on Composio

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Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati

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.

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.

Nirman Dave

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.

Ryan Yu

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.

Tomisin Jenrola

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.

Jerome Leclanche

Co-Founder, Ingram Technologies