@cryptoapis-io/mcp-address-latest

MCP server for Crypto APIs Address Latest product. Query recent blockchain address data (last 14 days) without requiring address sync.

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

Features

Query EVM addresses (Ethereum, Ethereum Classic, BSC, Polygon, Avalanche (C-Chain), Arbitrum, Base, Optimism, Tron)
Query UTXO addresses (Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash)
Query Solana addresses (SOL balance, transactions, SPL tokens)
Query XRP/Ripple addresses (balance, transactions, sequence)
Query Kaspa addresses (balance, transactions)
Cursor-based pagination for large result sets
No address sync required (unlike Address History)

Prerequisites

To use this MCP server, you need:

Register at Crypto APIs
Generate an API key from your dashboard

Installation

Terminal

npm install @cryptoapis-io/mcp-address-latest

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

Usage

server.ts

# Run with API key
npx @cryptoapis-io/mcp-address-latest --api-key YOUR_API_KEY

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

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

Cursor

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

config.json

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

MCP Inspector

Terminal

npx @modelcontextprotocol/inspector npx @cryptoapis-io/mcp-address-latest --api-key YOUR_API_KEY

n8n

Start the server in HTTP mode:

Terminal

npx @cryptoapis-io/mcp-address-latest --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

`evm_address_latest`

Query latest EVM address data.

Actions:

Action	Description
`get-balance`	Get address balance
`get-next-nonce`	Get next available nonce. Supported: Ethereum (mainnet, sepolia), Ethereum Classic (mainnet, mordor), BSC (mainnet, testnet)
`list-transactions`	List address transactions
`list-token-transfers`	List token transfers (ERC-20, ERC-721, ERC-1155)
`list-internal-transactions`	List internal transactions

Supported Blockchains: ethereum, ethereum-classic, binance-smart-chain, polygon, avalanche (C-Chain), arbitrum, base, optimism, tron

`utxo_address_latest`

Query latest UTXO address data.

Actions:

Action	Description
`get-balance`	Get address balance
`list-transactions`	List address transactions
`list-unconfirmed-transactions`	List unconfirmed transactions (mempool); uses offset pagination

Supported Blockchains: bitcoin, bitcoin-cash, litecoin, dogecoin, dash, zcash

`solana_address_latest`

Query latest Solana address data.

Actions:

Action	Description
`get-balance`	Get address SOL balance
`list-transactions`	List address transactions
`list-tokens`	List SPL tokens held by address

Supported Networks: mainnet, devnet

`xrp_address_latest`

Query latest XRP (Ripple) address data.

Actions:

Action	Description
`get-balance`	Get address XRP balance
`list-transactions`	List address transactions
`get-next-sequence`	Get next available sequence number

Supported Networks: mainnet, testnet

`kaspa_address_latest`

Query latest Kaspa address data.

Actions:

Action	Description
`get-balance`	Get address KAS balance
`list-transactions`	List address transactions

Supported Networks: mainnet

Pagination

Most list endpoints use cursor-based pagination:

json

// Response
{
  "items": [...],
  "limit": 10,
  "hasMore": true,
  "nextStartingAfter": "abc123"
}

Use nextStartingAfter value as startingAfter parameter in the next request.

Exception: list-unconfirmed-transactions (UTXO) uses offset pagination with limit, offset, and total fields.

Configuration

For stdio transport, provide the API key at startup via CLI argument or environment variable. For HTTP transport, it can also be provided per-request via x-api-key header (see HTTP API Key Modes).

Command-line argument (recommended):

Terminal

npx @cryptoapis-io/mcp-address-latest --api-key {your_api_key}

Environment variable:

server.ts

export CRYPTOAPIS_API_KEY={your_api_key}

CLI Arguments

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

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-address-latest --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-address-latest --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-address-latest --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