solmail-mcp

An MCP server that enables AI agents to send physical letters and postcards to real addresses worldwide using Solana cryptocurrency for payment. It integrates with Lob.com for printing and mailing, supports non-custodial wallet control, and provides tools for getting quotes, sending mail, and checking wallet balances.

Package and access

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

Community listingLocal stdioSource reviewed; not executedPublished by ExpertVagabond

You need:SOLANA_PRIVATE_KEY Yes Agent wallet private key (base58)

Vendor documentation

What you can do with it

Send physical letters to domestic US addresses
Send international postcards to 200+ countries
Get price quotes for mail services
Check agent wallet SOL balance

Source and maintenance

Community listingRegistry 1.0.2

mcp-registry: io.github.ExpertVagabond/solmail@1.0.2 Source repository

Maintenance checked: Oct 31, 2026, 10:27 PM UTC

Packages and installation

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

solmail-mcp 1.0.2

npm

solmail-mcp package definition

{
  "version": "1.0.2",
  "transport": "stdio",
  "identifier": "solmail-mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "SOLANA_PRIVATE_KEY",
      "format": "string",
      "isRequired": true,
      "description": "Your agent's Solana wallet private key (base58 or JSON array format)"
    },
    {
      "name": "SOLANA_NETWORK",
      "format": "string",
      "description": "Solana network: devnet for testing, mainnet-beta for production"
    },
    {
      "name": "SOLMAIL_API_URL",
      "format": "string",
      "description": "SolMail API endpoint"
    },
    {
      "name": "MERCHANT_WALLET",
      "format": "string",
      "description": "Merchant wallet address for payments"
    }
  ]
}

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": {
    "solmail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "solmail-mcp@1.0.2"
      ],
      "env": {
        "SOLANA_PRIVATE_KEY": "<YOUR_SOLANA_PRIVATE_KEY>",
        "SOLANA_NETWORK": "<YOUR_SOLANA_NETWORK>",
        "SOLMAIL_API_URL": "<YOUR_SOLMAIL_API_URL>",
        "MERCHANT_WALLET": "<YOUR_MERCHANT_WALLET>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "solmail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "solmail-mcp@1.0.2"
      ],
      "env": {
        "SOLANA_PRIVATE_KEY": "<YOUR_SOLANA_PRIVATE_KEY>",
        "SOLANA_NETWORK": "<YOUR_SOLANA_NETWORK>",
        "SOLMAIL_API_URL": "<YOUR_SOLMAIL_API_URL>",
        "MERCHANT_WALLET": "<YOUR_MERCHANT_WALLET>"
      }
    }
  }
}

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": {
    "solmail-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "solmail-mcp@1.0.2"
      ],
      "env": {
        "SOLANA_PRIVATE_KEY": "<YOUR_SOLANA_PRIVATE_KEY>",
        "SOLANA_NETWORK": "<YOUR_SOLANA_NETWORK>",
        "SOLMAIL_API_URL": "<YOUR_SOLMAIL_API_URL>",
        "MERCHANT_WALLET": "<YOUR_MERCHANT_WALLET>"
      }
    }
  }
}

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": {
    "solmail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "solmail-mcp@1.0.2"
      ],
      "env": {
        "SOLANA_PRIVATE_KEY": "<YOUR_SOLANA_PRIVATE_KEY>",
        "SOLANA_NETWORK": "<YOUR_SOLANA_NETWORK>",
        "SOLMAIL_API_URL": "<YOUR_SOLMAIL_API_URL>",
        "MERCHANT_WALLET": "<YOUR_MERCHANT_WALLET>"
      }
    }
  }
}

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