CryptoAPIs MCP Prepare Transactions
About
MCP server for building unsigned transactions on multiple blockchains via Crypto APIs
Details
- Author
- cryptoapis-io
- Categories
- Other, Finance, API
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Setup
Install CryptoAPIs MCP Prepare Transactions in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/cryptoapis-io/cryptoapis-mcp-prepare-transactions
Follow the installation instructions in the repository README, then restart your MCP client.
MCP server for building unsigned transactions on multiple blockchains via Crypto APIs
API Version:Compatible with Crypto APIs version2024-12-12
- Prepare native coin transfer transactions (from address)
- Prepare fungible token (ERC-20) transfer transactions
- Prepare NFT (ERC-721) transfer transactions
- Returns unsigned transaction hex ready for signing with@cryptoapis-io/mcp-signer
- Node.js 18+
- Crypto APIsaccount and API key (sign up|get API key)
npm install @cryptoapis-io/mcp-prepare-transactions
Or install all Crypto APIs MCP servers:npm install @cryptoapis-io/mcp
# Run with API key npx @cryptoapis-io/mcp-prepare-transactions --api-key YOUR_API_KEY # Or use environment variable export CRYPTOAPIS_API_KEY=YOUR_API_KEY npx @cryptoapis-io/mcp-prepare-transactions # HTTP transport npx @cryptoapis-io/mcp-prepare-transactions --transport http --port 3000 --api-key YOUR_API_KEY
Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.jsonon macOS,%APPDATA%\Claude\claude_desktop_config.jsonon Windows):
{ "mcpServers": { "cryptoapis-prepare-transactions": { "command": "npx", "args": ["-y", "@cryptoapis-io/mcp-prepare-transactions"], "env": { "CRYPTOAPIS_API_KEY": "your_api_key_here" } } } }
Add to.cursor/mcp.json(project) or~/.cursor/mcp.json(global):
{ "mcpServers": { "cryptoapis-prepare-transactions": { "command": "npx", "args": ["-y", "@cryptoapis-io/mcp-prepare-transactions"], "env": { "CRYPTOAPIS_API_KEY": "your_api_key_here" } } } }
npx @modelcontextprotocol/inspector npx @cryptoapis-io/mcp-prepare-transactions --api-key YOUR_API_KEY
- Start the server in HTTP mode:
npx @cryptoapis-io/mcp-prepare-transactions --transport http --port 3000 --api-key YOUR_API_KEY
All servers default to port 3000. Use--portto assign different ports when running multiple servers.
When using HTTP transport, the server supports two API key modes:
- With--api-key:The key is used for all requests.x-api-keyrequest headers are ignored.
- Without--api-key:Each request must include anx-api-keyheader with a valid Crypto APIs key. This enables hosting a public server where each user provides their own key.
# Per-request key mode (multi-tenant) npx @cryptoapis-io/mcp-prepare-transactions --transport http --port 3000 # Clients send x-api-key header with each request
Stdio transport always requires an API key at startup.
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.
Crypto APIs provides an official remote MCP server with all tools available via HTTP Streamable transport athttps://ai.cryptoapis.io/mcp. Pass your API key via thex-api-keyheader — no installation required.
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