@cryptoapis-io/mcp-blockchain-fees

MCP server for Crypto APIs Blockchain Fees product. Fee recommendations and gas estimates for UTXO, EVM, XRP, Tezos, and Solana 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
Tezos fee recommendations and fee estimation for native XTZ, FA1.2, and FA2 transfers
Solana fee recommendations and compute-unit estimation for native SOL transfers, SPL token transfers, and arbitrary program invocations

Prerequisites

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

Installation

Terminal

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

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

Usage

server.ts

# 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 (listens on 127.0.0.1; see "Exposing the server beyond localhost")
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/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

config.json

{
  "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):

config.json

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

MCP Inspector

Terminal

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

n8n

Start the server in HTTP mode:

Terminal

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

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

n8n in Docker: localhost inside the container is not your machine. Start the server with --host 0.0.0.0 and MCP_AUTH_TOKEN set (see Exposing the server beyond localhost), use http://host.docker.internal:3000/mcp as the URL, and add an Authorization: Bearer <token> header to the MCP Client Tool credential.

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

Available Tools

`blockchain_fees_utxo`

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

Action	Description
`get-fee-recommendations`	Get fee recommendations (slow, standard, fast)
`estimate-transaction-smart-fee`	Estimate smart fee for a target confirmation time

`blockchain_fees_evm`

Fee recommendations and gas estimation for EVM blockchains.

Action	Description
`get-fee-recommendations`	Get fee recommendations (slow, standard, fast)
`get-eip-1559-fee-recommendations`	Get EIP-1559 fee recommendations (base fee, priority fee)
`estimate-native-coin-transfer-gas`	Estimate gas for native coin transfer
`estimate-token-transfer-gas`	Estimate gas for token transfer
`estimate-contract-interaction-gas`	Estimate gas for contract interaction

`blockchain_fees_xrp`

Fee recommendations for XRP (mainnet, testnet).

Action	Description
`get-fee-recommendations`	Get XRP fee recommendations

`blockchain_fees_tezos`

Fee recommendations and fee estimation for Tezos (mainnet, shadownet).

Action	Description
`get-fee-recommendations`	Get current minimal fee/cost rates from the mempool
`estimate-transfer`	Estimate the fee for a native XTZ transfer
`estimate-fa12-transfer`	Estimate the fee for an FA1.2 token transfer
`estimate-fa2-transfer`	Estimate the fee for an FA2 token transfer

`blockchain_fees_solana`

Fee recommendations and compute-unit estimation for Solana (mainnet, devnet).

Action	Description
`get-fee-recommendations`	Get current priority fee recommendations from the mempool
`estimate-native-coin-transfer-compute-units`	Estimate compute units for a native SOL transfer
`estimate-token-transfer-compute-units`	Estimate compute units for an SPL token transfer
`estimate-program-invocation-compute-units`	Estimate compute units for an arbitrary program instruction call

CLI Arguments

Argument	Description	Default
`--api-key`	Crypto APIs API key	`CRYPTOAPIS_API_KEY` env var
`--transport`	Transport type: `stdio` or `http`	`stdio`
`--host`	HTTP host (use `0.0.0.0` to accept remote connections — requires an auth token with `--api-key`)	`127.0.0.1`
`--auth-token`	Bearer token callers must send (`Authorization: Bearer <token>`); prefer the `MCP_AUTH_TOKEN` env var	`MCP_AUTH_TOKEN` env var
`--allowed-hosts`	Comma-separated `Host` header allowlist for non-loopback binds	—
`--port`	HTTP port	`3000`
`--path`	HTTP path	`/mcp`
`--stateless`	Enable stateless HTTP mode	`false`

HTTP API Key Modes

When using HTTP transport, the server supports two API key modes:

With --api-key: The key is used for all requests. x-api-key request headers are ignored.
Without --api-key: Each request must include an x-api-key header with a valid Crypto APIs key. This enables hosting a public server where each user provides their own key.

bash

# Per-request key mode (multi-tenant)
npx @cryptoapis-io/mcp-blockchain-fees --transport http --port 3000
# Clients send x-api-key header with each request

Exposing the server beyond localhost

HTTP mode listens on 127.0.0.1 by default, so only processes on the same machine can reach it. To accept connections from other machines or containers, bind explicitly and protect the port:

server.ts

# Startup-key mode: callers must present the token (the server refuses to start without one)
export MCP_AUTH_TOKEN=$(openssl rand -hex 32)
npx @cryptoapis-io/mcp-blockchain-fees --transport http --host 0.0.0.0 --port 3000 --api-key YOUR_API_KEY \
  --allowed-hosts mcp.internal.example
# Clients send: Authorization: Bearer $MCP_AUTH_TOKEN

# Per-request key mode: no startup key, every request must carry the caller's own x-api-key
npx @cryptoapis-io/mcp-blockchain-fees --transport http --host 0.0.0.0 --port 3000

--allowed-hosts restricts the Host header (DNS rebinding protection) when not bound to loopback. Prefer MCP_AUTH_TOKEN over --auth-token: command-line arguments are visible in the process list.

Stdio transport always requires an API key at startup.

Important: API Key Required

Warning: Making requests without a valid API key — or with an incorrect one — may result in your IP being banned from the Crypto APIs ecosystem. Always ensure a valid API key is configured before starting any server.

Remote MCP Server

Crypto APIs provides an official remote MCP server with all tools available via HTTP Streamable transport at https://ai.cryptoapis.io/mcp. Pass your API key via the x-api-key header — no installation required.

License

MIT