Substrate MCP Server

What it does

This server connects AI agents to Substrate-based blockchains. It allows LLMs to interact with on-chain data and perform blockchain operations using natural language, interfacing directly via the subxt crate.

Tools

• query_balance: Fetch the balance of a specific account
• list_pallets: List all pallets available in the runtime
• list_pallet_entries: List all storage entries for a given pallet
• dynamic_runtime_call: Execute a runtime API call
• send_dynamic_signed_transaction: Construct, sign, and send a blockchain transaction
• query_storage: Query storage by pallet and entry
• get_latest_events: Retrieve all events from the latest block
• find_events: Search for specific events by pallet and variant
• get_latest_block: Get details of the most recent block
• get_block_by_hash: Retrieve block details using a specific hash
• find_extrinsics: Find extrinsics in the latest block
• get_system_info: Get system information via RPC
• custom_rpc: Make custom RPC calls to the Substrate node

Installation

Build the release binary:

cargo build --release

Configure your .env with RPC_URL and SIGNING_KEYPAIR_HEX, and ensure artifacts/metadata.scale is present.

Supported hosts

• Cursor
• Claude Desktop