Web3 MCP

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A Model-Context-Protocol server for interacting with multiple blockchains including Solana, Ethereum, THORChain, and UTXO chains. This server provides simple RPC endpoints for common blockchain operations, allowing secure interactions with various blockchains through environment variables.

Features

Solana Operations:

Check SOL account balances
Get detailed account information
Transfer SOL between accounts
View SPL token balances
Get your wallet address from private key
Swap tokens using Jupiter (Best price routing across all Solana DEXs)

Ethereum & EVM Chain Operations:

Check native token balances across multiple networks
Check ERC-20 token balances
Send native tokens (using private key from .env)
Send ERC-20 tokens (using private key from .env)
Approve ERC-20 token spending (using private key from .env)

THORChain Operations:

Check RUNE balances
Get detailed pool information
Get swap quotes between any supported assets
Cross-chain swaps via THORChain protocol

UTXO Chain Operations:

Bitcoin (BTC)
- Check address balances
- View transaction history
- Validate addresses
- Get network info and fees
Litecoin (LTC)
- Check address balances
- View transaction history
- Validate addresses
- Get network info and fees
Dogecoin (DOGE)
- Check address balances
- View transaction history
- Validate addresses
- Get network info and fees
Bitcoin Cash (BCH)
- Check address balances
- View transaction history
- Validate addresses
- Get network info and fees

Supported EVM Networks:

Ethereum
Base
Arbitrum
Optimism
BSC (Binance Smart Chain)
Polygon
Avalanche
Berachain

Setup

Clone and install dependencies:


git clone https://github.com/strangelove-ventures/web3-mcp.git
cd web3-mcp
npm install

Create a .env file in the root directory:


cp .env.example .env

Configure your environment variables in .env:

Required Configuration


# Tool Registration Controls
ENABLE_SOLANA_TOOLS=true      # Enable/disable Solana tools
ENABLE_ETHEREUM_TOOLS=true    # Enable/disable Ethereum and EVM chain tools

# UTXO Chain Tools
ENABLE_BITCOIN_TOOLS=true     # Enable/disable Bitcoin tools
ENABLE_LITECOIN_TOOLS=true    # Enable/disable Litecoin tools
ENABLE_DOGECOIN_TOOLS=true    # Enable/disable Dogecoin tools
ENABLE_BITCOINCASH_TOOLS=true # Enable/disable Bitcoin Cash tools
ENABLE_THORCHAIN_TOOLS=true   # Enable/disable THORChain tools

# Private Keys (required for transactions)
ETH_PRIVATE_KEY=your-ethereum-private-key
SOLANA_PRIVATE_KEY=your-base58-encoded-solana-private-key

Optional Configuration


# Network RPC URLs (optional - will use public endpoints if not specified)
SOLANA_RPC_URL=https://api.mainnet-beta.solana.com

# Ethereum & Layer 2s
ETH_RPC_URL=https://eth-mainnet.g.alchemy.com/v2/your-api-key
ARBITRUM_RPC_URL=https://arb1.arbitrum.io/rpc
BASE_RPC_URL=https://mainnet.base.org
OPTIMISM_RPC_URL=https://mainnet.optimism.io

# Other EVM Chains
BSC_RPC_URL=https://bsc-dataseed.binance.org
POLYGON_RPC_URL=https://polygon-rpc.com
AVALANCHE_RPC_URL=https://api.avax.network/ext/bc/C/rpc
BERACHAIN_RPC_URL=https://rpc.berachain.com

# THORChain Configuration
THORCHAIN_NODE_URL=https://thornode.ninerealms.com  # Optional - will use public endpoint if not specified
THORCHAIN_PRIVATE_KEY=your-thorchain-private-key
THORCHAIN_MNEMONIC=your-thorchain-mnemonic

# UTXO Chain API Keys (optional)
BLOCKCYPHER_API_KEY=your-blockcypher-api-key
SOCHAIN_API_KEY=your-sochain-api-key

Build the tool:


npm run build

Add the tool to your claude_desktop_config.json:


{
  "mcpServers": {
    "web3-rpc": {
      "command": "node",
      "args": [
        "/PATH/TO/web3-mcp/build/index.js"
      ]
    }
  }
}

Tool Registration

The Web3 MCP server allows you to control which blockchain tools are registered through environment variables:

ENABLE_SOLANA_TOOLS: Enable/disable Solana tools
ENABLE_ETHEREUM_TOOLS: Enable/disable Ethereum and EVM chain tools
ENABLE_BITCOIN_TOOLS: Enable/disable Bitcoin tools
ENABLE_LITECOIN_TOOLS: Enable/disable Litecoin tools
ENABLE_DOGECOIN_TOOLS: Enable/disable Dogecoin tools
ENABLE_BITCOINCASH_TOOLS: Enable/disable Bitcoin Cash tools
ENABLE_THORCHAIN_TOOLS: Enable/disable THORChain tools

Set these variables to true or false in your .env file to control which tools are available to the server. This allows you to:

Reduce startup time by only loading required tools
Minimize security surface area by disabling unused chains
Customize the server for specific use cases
Control resource usage by limiting active connections

Usage Examples

Ask Claude (or your MCP client of choice):

Solana Operations (when ENABLE_SOLANA_TOOLS=true)

“What’s my Solana address?” - Shows your address derived from private key in .env
“What’s the balance of 62QXuWZ3WT6ws1ZFxJobVDVXn6bEsiYpLo5yG612U6u3?”
“Transfer 0.001 SOL to Cg6cVS4tjkxHthm3K9BHhmvqF7kSz8GnXqqYXnHBzGXd”
“Show me my SPL token balances”
“Swap 0.1 SOL to USDC” (Uses Jupiter for best price routing)

EVM Operations (when ENABLE_ETHEREUM_TOOLS=true)

“What’s the ETH balance of 0x556437c4d22ceaeeebf82006b85bdcc0ae67d933?”
“Check the USDC balance for 0x556437c4d22ceaeeebf82006b85bdcc0ae67d933 on Ethereum”
“Send 0.1 ETH to 0x556437c4d22ceaeeebf82006b85bdcc0ae67d933”
“What’s the current gas price on Arbitrum?”
“Send 100 USDC to 0x556437c4d22ceaeeebf82006b85bdcc0ae67d933 on Polygon”

Bitcoin Operations (when ENABLE_BITCOIN_TOOLS=true)

“What’s the BTC balance of 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa?”
“Show me the transaction history for bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh”
“Validate this Bitcoin address: 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa”

Litecoin Operations (when ENABLE_LITECOIN_TOOLS=true)

“What’s the LTC balance of LM2WMpR1Rp6j3Sa59cMXMs1SPzj9eXpGc1?”
“Show me the transaction history for this Litecoin address”
“What’s the current Litecoin network fee?”

Dogecoin Operations (when ENABLE_DOGECOIN_TOOLS=true)

“Check this DOGE address balance: D8vFz4p1L37jdg47HXKtSHA5uYLYxbGgPD”
“Show me recent Dogecoin transactions”
“What are the current DOGE network fees?”

Bitcoin Cash Operations (when ENABLE_BITCOINCASH_TOOLS=true)

“What’s the BCH balance of this address?”
“Show me the BCH transaction history”
“Validate this Bitcoin Cash address”

THORChain Operations (when ENABLE_THORCHAIN_TOOLS=true)

“What’s the RUNE balance of thor13zpdckczd0jvyhwxmrwnpap8gmy9m5kk2gzum3?”
“Show me the pool information for BTC.BTC”
“Get a swap quote for 0.1 BTC.BTC to ETH.ETH”

Security Notes

Environment Variables: All private keys are stored in the .env file and never exposed in the conversation history
Private Keys: Only use this with test wallets containing small amounts of funds
RPC Endpoints: Custom RPC endpoints can be configured in the .env file for better reliability and rate limits
.env Security: The .env file is automatically ignored by git to prevent accidental exposure of private keys
Tool Registration: Use the tool registration controls to minimize security surface area by only enabling required chains

Advanced Configuration

Custom RPC Endpoints

You can configure custom RPC endpoints in your .env file for better reliability and higher rate limits. If not specified, the tool will fall back to public RPC endpoints.

Network Selection

For EVM operations, you can specify the network by name (ethereum, base, arbitrum, optimism, bsc, polygon, avalanche, berachain). The tool will automatically use the appropriate RPC endpoint and network configuration.

THORChain Configuration

The tool uses Nine Realms public endpoints by default, but you can configure a custom THORChain node URL in the .env file for better reliability and rate limits.

UTXO Chain Data Providers

The tool uses several data providers for UTXO chains:

BlockCypher
SoChain
Haskoin (for Bitcoin Cash)

You can configure API keys for these providers in the .env file for better rate limits.

Development

To modify or extend the tool:

Source code is in the src directory
Chain-specific code in src/chains
Run npm run build after making changes
Use TypeScript for all new code

Contributing

Contributions are welcome! Please submit pull requests with any improvements or bug fixes.

License

ISC License