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Build unsigned transactions on EVM, UTXO, Solana, XRP, and Tron via Crypto APIs
About
Build and prepare unsigned blockchain transactions using your AI assistant. This hosted MCP server connects directly to the Crypto APIs Prepare Transactions product, no local installation needed. Construct unsigned transactions ready for offline signing across EVM chains (Ethereum, BSC, Polygon, Avalanche, Arbitrum, Base, Optimism, Tron), UTXO chains (Bitcoin, Litecoin, Dogecoin, Dash, Zcash, Bitcoin Cash), Solana, and XRP. The server handles nonce, fee estimation, and UTXO selection automatically. Requires a Crypto APIs API key passed via the x-api-key header.
Security Report
9.0
Low Risk9.0Low RiskRemote MCP endpoint verified (153ms response). Server: cryptoapis-mcp-http-server. 2 trust signals: valid MCP protocol, requires auth. No security issues detected.
Endpoint verified · Open access · 1 issue found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Remote servers are capped at 8.0 because source code is not available for review. The score reflects endpoint verification only.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
CryptoAPIs API key. Sign up at cryptoapis.io to get your free key — passed via the x-api-key headerRequired
Environment variable: x-api-key
Sign up freeHow to Connect
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"cryptoapis-prepare-transactions-mcp-http-server": {
"env": {
"x-api-key": "your-x-api-key-here"
},
"url": "https://ai.cryptoapis.io/mcp/prepare-transactions"
}
}
}Getting Started
Once installed, try these example prompts and explore these capabilities:
- 1"Build an unsigned Bitcoin transaction sending 0.1 BTC to this address"
- 2"Prepare an unsigned Ethereum transfer of 1 ETH"
- 3"Create an unsigned Polygon contract call transaction"
- 4"Build an unsigned XRP payment transaction"
- 5Tool: prepare_transaction_evm — Build unsigned EVM transactions with automatic nonce and fee
- 6Tool: prepare_transaction_utxo — Build unsigned UTXO transactions with automatic UTXO selection
- 7Tool: prepare_transaction_xrp — Build unsigned XRP payment transactions
- 8Tool: prepare_transaction_solana — Build unsigned Solana transfer transactions
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