Blockchain Fees MCP server

@cryptoapis-io/mcp-blockchain-fees

MCP server for Crypto APIs Blockchain Fees product. Fee recommendations and gas estimates for UTXO, EVM, and XRP blockchains.

API Version: Compatible with Crypto APIs version 2024-12-12

Features

• UTXO fee recommendations and smart fee estimation (Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash)
• EVM fee recommendations, EIP-1559 fees, and gas estimation for transfers and contract calls
• XRP fee recommendations

Prerequisites

• Node.js 18+
• Crypto APIs account and API key (sign up | get API key)

Installation

npm install @cryptoapis-io/mcp-blockchain-fees

Or install all Crypto APIs MCP servers: npm install @cryptoapis-io/mcp

Usage

# Run with API key
npx @cryptoapis-io/mcp-blockchain-fees --api-key YOUR_API_KEY

# Or use environment variable
export CRYPTOAPIS_API_KEY=YOUR_API_KEY
npx @cryptoapis-io/mcp-blockchain-fees

# HTTP transport
npx @cryptoapis-io/mcp-blockchain-fees --transport http --port 3000 --api-key YOUR_API_KEY

Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claudedesktopconfig.json on macOS, %APPDATA%\Claude\claudedesktopconfig.json on Windows):

{
  "mcpServers": {
    "cryptoapis-blockchain-fees": {
      "command": "npx",
      "args": ["-y", "@cryptoapis-io/mcp-blockchain-fees"],
      "env": {
        "CRYPTOAPIS_API_KEY": "your_api_key_here"
      }
    }
  }
}

Cursor

Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

{
  "mcpServers": {
    "cryptoapis-blockchain-fees": {
      "command": "npx",
      "args": ["-y", "@cryptoapis-io/mcp-blockchain-fees"],
      "env": {
        "CRYPTOAPIS_API_KEY": "your_api_key_here"
      }
    }
  }
}

MCP Inspector

npx @modelcontextprotocol/inspector npx @cryptoapis-io/mcp-blockchain-fees --api-key YOUR_API_KEY

n8n

1. Start the server in HTTP mode:

npx @cryptoapis-io/mcp-blockchain-fees --transport http --port 3000 --api-key YOUR_API_KEY

1. In your n8n workflow, add an AI Agent node
2. Under Tools, add an MCP Client Tool and set the URL to http://localhost:3000/mcp

All servers default to port 3000. Use --port to assign different ports when running multiple servers.

Available Tools

blockchainfeesutxo

Fee recommendations for UTXO blockchains (Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash).

blockchainfeesevm

Fee recommendations and gas estimation for EVM blockchains.

blockchainfeesxrp

Fee recommendations for XRP (mainnet, testnet).

CLI Arguments

HTTP API Key Modes

Shortened. The full README is on GitHub.