Boar blockchain MCP (advanced)

Name: Boar blockchain MCP (advanced)
Author: boar-network

Free, keyless MCP server with 50 read-only blockchain tools for Bitcoin, Ethereum, and Mezo.

CommunityOnlineNo sign-inGlobalFreeRead-only

What it can do

Eth Call: Execute a read-only smart contract call on Ethereum mainnet. Returns the hex-encoded return data. Use this to read contract state without sending a transaction.
Mezo Call: Execute a read-only smart contract call on Mezo. Returns the hex-encoded return data. Use this to read contract state without sending a transaction.
Eth Decode Revert: Decode raw EVM revert data from a failed transaction or eth_call on Ethereum mainnet. Handles Error(string) reverts, Panic(uint256) assertions, custom Solidity errors (requires ABI)

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 (advanced) to Claude

The server address to paste into Claude settings:

https://blockchain-advanced--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 (advanced) to ChatGPT

The server address to paste into ChatGPT settings:

https://blockchain-advanced--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 (advanced) to Cursor

The server address to paste into Cursor settings:

https://blockchain-advanced--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.json in 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 (13)

Raw names from tools/list. Only developers need these.

eth_call	Execute a read-only smart contract call on Ethereum mainnet. Returns the hex-encoded return data. Use this to read contract state without sending a transaction.
mezo_call	Execute a read-only smart contract call on Mezo. Returns the hex-encoded return data. Use this to read contract state without sending a transaction.
eth_decode_revert	Decode raw EVM revert data from a failed transaction or eth_call on Ethereum mainnet. Handles Error(string) reverts, Panic(uint256) assertions, custom Solidity errors (requires ABI), and silent reverts. Pure computation — no RPC call needed. Pass the hex revert data from a transaction receipt or eth_call error response.
mezo_decode_revert	Decode raw EVM revert data from a failed transaction or mezo_call on Mezo. Handles Error(string) reverts, Panic(uint256) assertions, custom Solidity errors (requires ABI), and silent reverts. Pure computation — no RPC call needed. Pass the hex revert data from a transaction receipt or eth_call error response.
eth_decode_calldata	Decode raw calldata into function name and typed arguments using a provided ABI on Ethereum mainnet. Pure computation — no RPC call needed. Pass the hex calldata from a transaction input or eth_call.
eth_decode_return	Decode raw return data from an eth_call into typed values using a provided ABI and function name on Ethereum mainnet. Pure computation — no RPC call needed.
eth_decode_log	Decode a raw event log (topics + data) into named fields using a provided ABI on Ethereum mainnet. Pure computation — no RPC call needed. Pass topics and data from a transaction receipt log entry.
mezo_decode_calldata	Decode raw calldata into function name and typed arguments using a provided ABI on Mezo. Pure computation — no RPC call needed. Pass the hex calldata from a transaction input or eth_call.
mezo_decode_return	Decode raw return data from an eth_call into typed values using a provided ABI and function name on Mezo. Pure computation — no RPC call needed.
mezo_decode_log	Decode a raw event log (topics + data) into named fields using a provided ABI on Mezo. Pure computation — no RPC call needed. Pass topics and data from a transaction receipt log entry.
eth_encode_calldata	Encode a function call into ABI-encoded calldata hex. Accepts either a human-readable function signature (e.g. 'transfer(address to, uint256 amount)') or a full ABI JSON array plus function name. Pass uint/int values as decimal strings to avoid JS number precision loss. Pure computation — no RPC call needed.
eth_multicall	Batch multiple read-only contract calls into a single RPC round trip via Multicall3 on Ethereum mainnet (0xcA11bde05977b3631167028862bE2a173976CA11). Returns success status and raw return data for each call. Use allowFailure=true to prevent one failed call from aborting the whole batch.
mezo_multicall	Batch multiple read-only contract calls into a single RPC round trip via Multicall3 on Mezo (0xcA11bde05977b3631167028862bE2a173976CA11). Returns success status and raw return data for each call. Use allowFailure=true to prevent one failed call from aborting the whole batch.