Koskamo

CryptoAPIs MCP Signer

A local transaction signing MCP server supporting EVM, UTXO, Tron, XRP, Kaspa, Solana, and Tezos blockchains. It performs signing entirely on the user's machine without making HTTP API calls or requiring API keys, ensuring private keys are passed directly as tool parameters rather than read from environment variables.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

CryptoAPIs MCP Signer logo, by CryptoAPIs-ioCommunity listingLocal stdioSource reviewed; not executedPublished by CryptoAPIs-io
You need:npm install @cryptoapis-io/mcp-signer
Vendor documentation

What you can do with it

  • Sign EVM transactions from structured fields or unsigned hex
  • Sign UTXO transactions for Bitcoin, Litecoin, and Zcash
  • Sign Tron transactions using secp256k1
  • Sign XRP transactions from structured fields

Source and maintenance

Community listingRegistry 0.5.0
mcp-registry: io.github.CryptoAPIs-io/mcp-signer@0.5.0Source repository
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@cryptoapis-io/mcp-signer 0.5.0

npm
@cryptoapis-io/mcp-signer package definition
{
  "version": "0.5.0",
  "transport": "stdio",
  "identifier": "@cryptoapis-io/mcp-signer",
  "registryType": "npm"
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "cryptoapis-mcp-signer": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer@0.5.0"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "cryptoapis-mcp-signer": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer@0.5.0"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "cryptoapis-mcp-signer": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer@0.5.0"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "cryptoapis-mcp-signer": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-signer@0.5.0"
      ]
    }
  }
}

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