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How to integrate Etherscan MCP with Hermes

Connect Hermes to Etherscan MCP. Check eth balance for a wallet address, list recent transactions for an ethereum address, and more using natural language, with authentication handled for you.

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Etherscan is a blockchain explorer and API for Ethereum and multichain network data. It provides reliable access to balances, transactions, tokens, contracts, gas, logs, and blocks.

54 Tools

Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Etherscan account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Etherscan with

ChatGPTClaude CoworkAtomic Agent

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,700+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Etherscan with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Etherscan

Ask your agent to connect to Etherscan, or simply request any Etherscan-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Etherscan connection.

Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Etherscan or request any Etherscan-related task. It will prompt you to authenticate and authorize access.

5. Done!

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

The Etherscan MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Etherscan account. It provides structured and secure access to blockchain account, transaction, contract, token, gas, and block data, so your agent can check balances and prices, inspect transactions and receipts, review verified contracts, track gas and block activity, and analyze token details on your behalf.

  • Account and market insights: Have your agent check native and ERC20 token balances, review Ether supply, look up token holder counts, and retrieve current native-token prices.
  • Transaction investigation: Direct your agent to look up transaction details, receipts, execution results, confirmation status, funding sources, and transaction counts for blockchain addresses.
  • Contract research: Let the agent retrieve verified source code, ABI details, bytecode, creation records, storage values, metadata, and read-only contract results.
  • Gas and network monitoring: Instruct your agent to check current gas recommendations, estimate transaction gas, track confirmation timing, inspect the latest block, and find block details by timestamp.
  • Token and blockchain analysis: Have your agent review token identity, supply, verification, project links, daily gas prices, block rewards, chain size, node counts, and beacon withdrawals.

Way Forward

With Etherscan connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

TOOLS

Supported Tools

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

Call Contract

Execute a read-only eth_call at latest state and return raw ABI-encoded data; no transaction is created.

Estimate Confirmation Time

Estimate confirmation time in seconds for an optional exact gas price in wei.

Estimate Transaction Gas

Estimate gas required for a transaction-like call without submitting a transaction.

Get Address Funding Source

Get the first transaction and address that funded an externally owned account.

Get Address Metadata

Get Etherscan nametags, labels, reputation, notes, and provider-defined metadata for up to 100 addresses.

Get Address Transaction Count

Get the number of transactions sent from an address at an optional block tag, as hexadecimal.

Get API Usage

Get API credits used, available, and allowed for the connected API key's current interval.

Get Block by Number

Get JSON-RPC block information for an explicit hexadecimal block number or the latest block, returning transaction hashes or full transaction objects.

Get Block Countdown

Estimate blocks and seconds remaining until a future block is mined.

Get Block Number by Timestamp

Get the decimal block number closest before or after a Unix timestamp in seconds.

Get Block Rewards

Get a block's miner reward, uncle inclusion reward, and included uncle records.

Get Block Transaction Count

Get a block's total JSON-RPC transaction count as hexadecimal, without transfer-type breakdowns.

Get Block Transaction Counts

Get Ethereum mainnet normal, internal, ERC20, ERC721, and ERC1155 transaction counts for a decimal block number.

Get Contract ABI

Get the JSON-encoded ABI string for a verified contract.

Get Contract Bytecode

Get bytecode stored at an address for an optional named or hexadecimal block tag.

Get Contract Creation

Get creator, creation transaction, block, Unix-second timestamp, factory, and creation bytecode for up to five contracts on one chain.

Get Contract Execution Status

Get whether a transaction's contract execution failed and any provider error description.

Get Contract Source Code

Get source code plus compiler, proxy, implementation, license, and verification metadata for one contract.

Get Contract Storage

Get the raw value at a contract storage position for an optional block tag.

Get Current Gas Price

Get the canonical JSON-RPC current gas price in wei as hexadecimal; use Get Gas Oracle for recommendations.

Get ERC20 Balance

Get one address's ERC20 token balance in exact smallest units, optionally at a historical block.

Get ERC20 Total Supply

Get an ERC20 token's current total supply, or its historical supply when block_number is provided; historical lookup requires Standard+, is mainnet-only, and is unavailable on testnets.

Get Ether Supply

Get Ether supply in wei, either the basic block-reward supply or the ETH-specific component breakdown including staking, EIP-1559 burned fees, and staking withdrawals.

Get Gas Oracle

Get current safe, proposed, and fast gas-price recommendations and the suggested base fee as gwei strings.

Get Latest Block Number

Get the latest block number as an exact hexadecimal JSON-RPC quantity.

Get Latest Native Price

Get the latest native-token prices in BTC and USD with their Unix-second timestamps.

Get Native Balance

Get one address's native-token balance in exact wei, optionally at a historical block.

Get Native Balances

Get native-token balances for up to 20 addresses in one call, returning wei as exact decimal strings on one chain.

Get Node Count

Get the current discoverable-node count or daily historical counts over a UTC date range.

Get Token Holder Count

Get the number of addresses currently holding an ERC20 token.

Get Token Info

Get token identity, standard, supply, verification, project links, price, and logo metadata for an ERC20, ERC721, or ERC1155 contract.

Get Transaction

Get one full JSON-RPC transaction by hash or by hexadecimal block number and transaction index.

Get Transaction Receipt

Get a full JSON-RPC transaction receipt, including event logs, by hash on one chain.

Get Transaction Receipt Status

Get a transaction receipt's success or failure status string.

Get Uncle Block

Get an uncle block by optional hexadecimal parent block number and uncle index.

Get Verification Status

Check source-code or proxy verification status for a GUID returned by a prior verification submission.

List Beacon Withdrawals

List one page of beacon-chain withdrawals, optionally filtered by recipient and inclusive block range.

List Chain Size

List daily Ethereum node-chain size measurements for one client and sync mode over a date range.

List Daily Block Counts and Rewards

List daily mined-block counts and corresponding block rewards in ether over a UTC date range.

List Daily Gas Prices

List daily minimum, average, and maximum gas prices in wei over a UTC date range.

List Daily Network Metrics

List one normalized daily scalar metric over a UTC date range.

List Daily Uncle Counts and Rewards

List daily uncle-block counts and uncle rewards in ether over a UTC date range.

List ERC721 Inventory

List one page of ERC721 token IDs owned by an address for one collection.

List Event Logs

List one provider page of event logs over an inclusive block range, filtered by an emitting address, indexed topics, or both.

List Internal Transactions

List internal transactions by address, transaction hash, or an unfiltered block range.

List L2 Bridge Transactions

List one page of canonical L2 deposits from Ethereum or withdrawals to Ethereum for an address on a supported L2.

List Normal Transactions

List one provider page of an address's normal transactions, optionally filtered by start and end block.

List Plasma Deposits

List one page of Plasma deposit transactions on documented Polygon, Gnosis, or BitTorrent Chain networks, optionally filtered by recipient address.

List Supported Chains

List current Etherscan mainnet and testnet chains, explorer and API URLs, and service status.

List Token Holders

List one page of ERC20 holders or up to 1000 top holders for a token.

List Token Holdings

List one page of ERC20 token balances or ERC721 collection quantities held by an address.

List Token Transfers

List one provider page of ERC20, ERC721, or ERC1155 transfers, selected by token_standard and filtered by an account, token contract, or both on one chain.

List Validated Blocks

List one page of full blocks or pre-Merge uncle blocks validated by an address.

Resolve ENS Name

Resolve an ENS name or supported onchain subdomain to an address on Ethereum mainnet.

FRAMEWORKS

How to build Etherscan MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Etherscan MCP with ChatGPT

Claude Cowork logo

Claude Cowork

Use Etherscan MCP with Claude Cowork

Atomic Agent logo

Atomic Agent

Use Etherscan MCP with Atomic Agent

FAQ

Frequently asked questions

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

Yes, you can. Hermes 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 Etherscan tools.

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

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