Boar Blockchain MCP
@boar-network
About Boar Blockchain MCP
Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo. No installation, no API key required - just add the URL to your MCP client and start querying balances, transactions, blocks, ENS names, ERC-20 tokens, smart contracts, and more. Runs on
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"boar-blockchain-mcp-basic": {
"type": "http",
"url": "https://mcp.boar.network/basic"
},
"boar-blockchain-mcp-advanced": {
"type": "http",
"url": "https://mcp.boar.network/advanced"
}
}
}Tools
46Get native token balance for an address on Ethereum mainnet. Returns balance in wei (hex and decimal) and in ether.
Get block data by number or tag on Ethereum mainnet. Use hex block number (e.g. "0x1") or "latest". Returns full block object with transaction hashes.
Get transaction details by hash on Ethereum mainnet. Returns full transaction object including from, to, value, input data, and status.
Get event logs matching a filter on Ethereum mainnet. Requires at least fromBlock and toBlock. Optionally filter by contract address and topics.
Get current gas price on Ethereum mainnet in wei (hex string). Use to estimate transaction costs.
Estimate gas required for a transaction on Ethereum mainnet. Returns gas estimate as hex string.
Get transaction receipt by hash on Ethereum mainnet. Returns status (0x1=success, 0x0=fail), gasUsed, contractAddress (for contract deployments), and event logs.
Get bytecode at an address on Ethereum mainnet. Returns "0x" for EOAs (wallets), non-empty hex for contracts. Use to determine if an address is a contract or EOA, and to retrieve deployed bytecode.
Get ERC-20 token balance for a wallet address on Ethereum mainnet. Returns raw balance, formatted balance with decimals, and token symbol. Calls balanceOf, decimals, and symbol on the token contract.
Get ERC-20 token metadata for a token address on Ethereum mainnet. Returns name, symbol, decimals, and total supply (raw and formatted). Degrades gracefully — any individual call failure returns null for that field.
Get native token balance for an address on Mezo. Returns balance in wei (hex and decimal) and in ether.
Get block data by number or tag on Mezo. Use hex block number (e.g. "0x1") or "latest". Returns full block object with transaction hashes.
Get transaction details by hash on Mezo. Returns full transaction object including from, to, value, input data, and status.
Get event logs matching a filter on Mezo. Requires at least fromBlock and toBlock. Optionally filter by contract address and topics.
Get current gas price on Mezo in wei (hex string). Use to estimate transaction costs.
Get transaction receipt by hash on Mezo. Returns status (0x1=success, 0x0=fail), gasUsed, contractAddress (for contract deployments), and event logs.
Get bytecode at an address on Mezo. Returns "0x" for EOAs (wallets), non-empty hex for contracts. Use to determine if an address is a contract or EOA, and to retrieve deployed bytecode.
Get ERC-20 token balance for a wallet address on Mezo. Returns raw balance, formatted balance with decimals, and token symbol. Calls balanceOf, decimals, and symbol on the token contract.
Get ERC-20 token metadata for a token address on Mezo. Returns name, symbol, decimals, and total supply (raw and formatted). Degrades gracefully — any individual call failure returns null for that field.
Get native token balance for an address on Mezo testnet. Returns balance in wei (hex and decimal) and in ether.
Get block data by number or tag on Mezo testnet. Use hex block number (e.g. "0x1") or "latest". Returns full block object with transaction hashes.
Get transaction details by hash on Mezo testnet. Returns full transaction object including from, to, value, input data, and status.
Get event logs matching a filter on Mezo testnet. Requires at least fromBlock and toBlock. Optionally filter by contract address and topics.
Get current gas price on Mezo testnet in wei (hex string). Use to estimate transaction costs.
Get transaction receipt by hash on Mezo testnet. Returns status (0x1=success, 0x0=fail), gasUsed, contractAddress (for contract deployments), and event logs.
Get bytecode at an address on Mezo testnet. Returns "0x" for EOAs (wallets), non-empty hex for contracts. Use to determine if an address is a contract or EOA, and to retrieve deployed bytecode.
Get ERC-20 token balance for a wallet address on Mezo testnet. Returns raw balance, formatted balance with decimals, and token symbol. Calls balanceOf, decimals, and symbol on the token contract.
Get ERC-20 token metadata for a token address on Mezo testnet. Returns name, symbol, decimals, and total supply (raw and formatted). Degrades gracefully — any individual call failure returns null for that field.
Get confirmed and unconfirmed balance for a Bitcoin address on Bitcoin mainnet. Returns balance in satoshis.
Get transaction history for a Bitcoin address on Bitcoin mainnet. Returns list of transactions with heights and tx hashes.
Get unspent transaction outputs (UTXOs) for a Bitcoin address on Bitcoin mainnet. Returns list of unspent outputs with tx hash, position, height, and value in satoshis.
Get full transaction details by txid on Bitcoin mainnet. Returns verbose transaction data including inputs, outputs, confirmations, and block hash.
Get block header data by height on Bitcoin mainnet. Returns parsed header with hash, version, previous block hash, merkle root, timestamp, bits, and nonce.
Get fee rate estimate on Bitcoin mainnet for a target number of blocks. Returns estimated fee in BTC/kB and sat/byte. Use target=1 for next-block, target=6 for ~1 hour. Returns -1 if no estimate available.
Get mempool fee histogram on Bitcoin mainnet. Returns array of [fee_rate, cumulative_vsize] pairs showing the distribution of transactions in the mempool by fee rate (sat/vB).
Get confirmed and unconfirmed balance for a Bitcoin address on Bitcoin testnet3. Returns balance in satoshis.
Get transaction history for a Bitcoin address on Bitcoin testnet3. Returns list of transactions with heights and tx hashes.
Get unspent transaction outputs (UTXOs) for a Bitcoin address on Bitcoin testnet3. Returns list of unspent outputs with tx hash, position, height, and value in satoshis.
Get full transaction details by txid on Bitcoin testnet3. Returns verbose transaction data including inputs, outputs, confirmations, and block hash.
Get block header data by height on Bitcoin testnet3. Returns parsed header with hash, version, previous block hash, merkle root, timestamp, bits, and nonce.
Get fee rate estimate on Bitcoin testnet3 for a target number of blocks. Returns estimated fee in BTC/kB and sat/byte. Use target=1 for next-block, target=6 for ~1 hour. Returns -1 if no estimate available.
Get mempool fee histogram on Bitcoin testnet3. Returns array of [fee_rate, cumulative_vsize] pairs showing the distribution of transactions in the mempool by fee rate (sat/vB).
Look up a 4-byte function or error selector against 4byte.directory. Returns matching function/error signatures. Useful for identifying unknown calldata selectors or decoding custom errors.
Fetch a verified contract's ABI from Sourcify by address. Returns the full ABI array and match type ('full' or 'partial'). Returns match_type 'none' for unverified contracts. Defaults to Ethereum mainnet (chain_id 1).
Resolve an ENS name to its Ethereum address. Returns null if the name is not registered or has no address record. Example: 'vitalik.eth' → '0xd8dA6BF26964aF9D68eC99A6d99030B4ec93B700'.
Reverse-resolve an Ethereum address to its primary ENS name. Returns null if no primary ENS name is set for the address.
Overview
What is Boar Blockchain MCP?
Boar Blockchain MCP is a free, keyless MCP server providing 50 read-only blockchain tools across Bitcoin, Ethereum, and Mezo. It runs on Cloudflare's global edge network and requires no installation or API key.
How to use Boar Blockchain MCP?
Configure the server in your MCP client’s .mcp.json file using either the basic endpoint (https://mcp.boar.network/basic, 37 tools) or the advanced endpoint (https://mcp.boar.network/advanced, 13 tools). Both can be added simultaneously. The server works with Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Gemini CLI.
Key features of Boar Blockchain MCP
- 50 read-only tools across Bitcoin, Ethereum, and Mezo
- No installation, API key, or account required
- Streamable HTTP with SSE fallback transport
- Two endpoints: Basic (37 tools) and Advanced (13 tools)
- Supports Bitcoin mainnet and testnet
- Cross-chain ABI fetch, ENS resolution, and Multicall3 batch reads
Use cases of Boar Blockchain MCP
- Query ETH balances and token holdings from any address
- Retrieve Bitcoin UTXOs and transaction details
- Decode revert reasons for failed Ethereum transactions
- Fetch verified ABIs from Sourcify for smart contracts
- Batch-read contract storage values using Multicall3
FAQ from Boar Blockchain MCP
Is this really free?
Yes. No API key, no account, no payment. Fair use applies.
Is it safe?
All tools are read-only. The server cannot send transactions, access private keys, or modify any blockchain state.
Frequently asked questions
Is this really free?
Yes. No API key, no account, no payment. Fair use applies.
Is it safe?
All tools are read-only. The server cannot send transactions, access private keys, or modify any blockchain state. ###
Basic information
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