MCP server for building unsigned transactions on multiple blockchains via Crypto APIs
Cryptoapis MCP Prepare Transactions MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. MCP server for building unsigned transactions on multiple blockchains via Crypto APIs.
MCP server for Crypto APIs Prepare Transactions product. Build unsigned EVM transactions for native coin transfers, fungible token transfers, and NFT transfers.
Once Cryptoapis MCP Prepare Transactions is connected, these are the calls the assistant has available:
Cursor — The Cursor tool exposed by this serverprepare_transactions_evm — The prepare_transactions_evm tool exposed by this serverThe server ships on npm as @cryptoapis-io/mcp-prepare-transactions, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.
You will need 2 environment variables: CRYPTOAPIS_API_KEY, YOUR_API_KEY. The server will not start without them, which is usually why the tools fail to appear on a first run. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Cryptoapis MCP Prepare Transactions's toolset — Cursor, prepare_transactions_evm — is a fair guide to whether it matches your workflow. It is maintained by cryptoapis-io; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| Cursor | The Cursor tool exposed by this server. |
| prepare_transactions_evm | The prepare_transactions_evm tool exposed by this server. |
{
"mcpServers": {
"cryptoapis-mcp-prepare-transactions": {
"command": "npx",
"args": ["-y", "@cryptoapis-io/mcp-prepare-transactions"],
"env": {
"CRYPTOAPIS_API_KEY": "your-value",
"YOUR_API_KEY": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| CRYPTOAPIS_API_KEY | Credential the server authenticates with. | Yes |
| YOUR_API_KEY | Credential the server authenticates with. | Yes |
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