Boar blockchain MCP (basic)
Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo.
Community: Submitted by a user or imported; check the owner before granting accessOnlineNo sign-inGlobalFreeRead-only
What it can do
- Eth Get Balance: Get native token balance for an address on Ethereum mainnet. Returns balance in wei (hex and decimal) and in ether.
- Eth Get Block: 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.
- Eth Get Transaction: Get transaction details by hash on Ethereum mainnet. Returns full transaction object including from, to, value, input data, and status.
What data it sees
Do you need an account
No: the server works without sign-in
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 Cloudflare's global edge network via Streamable HTTP. All tools are strictly read-only and stateless.
How to connect
How to connect Boar blockchain MCP (basic) to Claude
The server address to paste into Claude settings:
https://blockchain-basic--boar-network.run.tools
- Open Claude (claude.ai or the desktop app).
- Go to Settings → Connectors.
- Click Add custom connector.
- Paste the server address copied below into Remote MCP server URL and click Add.
- In a chat, click + → Connectors and switch the new connector on.
Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.
Authorization
After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.
How to connect Boar blockchain MCP (basic) to ChatGPT
The server address to paste into ChatGPT settings:
https://blockchain-basic--boar-network.run.tools
- Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
- Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
- Open Settings → Connectors and click Create.
- Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
- Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
- In a new chat open + → Apps/Connectors and enable the connector.
OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.
Authorization
On first use ChatGPT opens the service's sign-in window. Sign in and approve access.
How to connect Boar blockchain MCP (basic) to Cursor
The server address to paste into Cursor settings:
https://blockchain-basic--boar-network.run.tools
Fastest: click Open in Cursor below and confirm the prompt.
Manually:
- In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
- Paste the JSON copied below into
~/.cursor/mcp.json(per project:.cursor/mcp.jsonin the repo root). - Save the file. The server appears in the MCP list; authorize it there if asked.
Authorization
If the service needs sign-in, an authorize button appears next to the server in the MCP list.
Server tool list (37)
Raw names from tools/list. Only developers need these.
| eth_get_balance | Get native token balance for an address on Ethereum mainnet. Returns balance in wei (hex and decimal) and in ether. |
| eth_get_block | 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. |
| eth_get_transaction | Get transaction details by hash on Ethereum mainnet. Returns full transaction object including from, to, value, input data, and status. |
| eth_get_logs | Get event logs matching a filter on Ethereum mainnet. Requires at least fromBlock and toBlock. Optionally filter by contract address and topics. |
| eth_gas_price | Get current gas price on Ethereum mainnet in wei (hex string). Use to estimate transaction costs. |
| eth_estimate_gas | Estimate gas required for a transaction on Ethereum mainnet. Returns gas estimate as hex string. |
| eth_get_transaction_receipt | Get transaction receipt by hash on Ethereum mainnet. Returns status (0x1=success, 0x0=fail), gasUsed, contractAddress (for contract deployments), and event logs. |
| eth_get_code | 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. |
| eth_get_token_balance | 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. |
| eth_get_token_info | 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. |
| mezo_get_balance | Get native token balance for an address on Mezo. Returns balance in wei (hex and decimal) and in ether. |
| mezo_get_block | 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. |
| mezo_get_transaction | Get transaction details by hash on Mezo. Returns full transaction object including from, to, value, input data, and status. |
| mezo_get_logs | Get event logs matching a filter on Mezo. Requires at least fromBlock and toBlock. Optionally filter by contract address and topics. |
| mezo_gas_price | Get current gas price on Mezo in wei (hex string). Use to estimate transaction costs. |
| mezo_get_transaction_receipt | Get transaction receipt by hash on Mezo. Returns status (0x1=success, 0x0=fail), gasUsed, contractAddress (for contract deployments), and event logs. |
| mezo_get_code | 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. |
| mezo_get_token_balance | 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. |
| mezo_get_token_info | 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. |
| btc_get_balance | Get confirmed and unconfirmed balance for a Bitcoin address on Bitcoin mainnet. Returns balance in satoshis. |
| btc_get_history | Get transaction history for a Bitcoin address on Bitcoin mainnet. Returns list of transactions with heights and tx hashes. |
| btc_get_utxos | 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. |
| btc_get_transaction | Get full transaction details by txid on Bitcoin mainnet. Returns verbose transaction data including inputs, outputs, confirmations, and block hash. |
| btc_get_block | Get block header data by height on Bitcoin mainnet. Returns parsed header with hash, version, previous block hash, merkle root, timestamp, bits, and nonce. |
| btc_get_fee_estimate | 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. |
| btc_get_mempool_info | 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). |
| btc_testnet_get_balance | Get confirmed and unconfirmed balance for a Bitcoin address on Bitcoin testnet3. Returns balance in satoshis. |
| btc_testnet_get_history | Get transaction history for a Bitcoin address on Bitcoin testnet3. Returns list of transactions with heights and tx hashes. |
| btc_testnet_get_utxos | 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. |
| btc_testnet_get_transaction | Get full transaction details by txid on Bitcoin testnet3. Returns verbose transaction data including inputs, outputs, confirmations, and block hash. |
| btc_testnet_get_block | Get block header data by height on Bitcoin testnet3. Returns parsed header with hash, version, previous block hash, merkle root, timestamp, bits, and nonce. |
| btc_testnet_get_fee_estimate | 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. |
| btc_testnet_get_mempool_info | 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). |
| eth_lookup_selector | 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. |
| eth_get_abi | 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). |
| eth_resolve_ens | 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'. |
| eth_lookup_address | Reverse-resolve an Ethereum address to its primary ENS name. Returns null if no primary ENS name is set for the address. |