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Solmail MCP server

by ExpertVagabond·io.github.ExpertVagabond/solmail·v1.0.2·1 stars
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Send physical mail with Solana cryptocurrency - AI agents can send real letters worldwide

B83/100grade B
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Safety scan
B83/100

full report

Adoption
Growing

1 stars35 downloads/wk

Reviews

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If you have run it, two minutes of your experience saves the next person an afternoon.

Solmail tools (4, 1 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • get_mail_quote

    Get a price quote for sending mail

  • get_wallet_address

    Get wallet address

  • get_wallet_balance

    Get wallet SOL balance

  • send_mailwrite action

    Send physical mail using Solana cryptocurrency

Public scan report

scanner v0.1.10 · 2026-09-28 · same rubric, same numbers if you re-run it

no findings
  • Code scan10 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 20 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 83/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Solmail compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
83/100
higher than 65% of 48,255 servers
Tools
4
the typical server has 7
Tools that change things
25%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
1
more than 65% of 28,688 servers
Downloads a week
35
more than 25% of 12,191 servers with a package

What its tools let an agent do: 3 read · 1 send or post

Install Solmail in Claude Code, Cursor or VS Code

Runs npx -y solmail-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add solmail -- npx -y solmail-mcp
Add to Cursor

What the publisher says

From the Solmail repository's README, as published. We do not edit it. Read it on GitHub

:mailboxwithmail: solmail-mcp

Send real physical mail using Solana cryptocurrency from your AI agent. A Model Context Protocol server that enables Claude and other AI agents to send physical letters and postcards to real addresses worldwide, paid with SOL. Built for the Colosseum Agent Hackathon (#47).

Install

npx solmail-mcp@latest

Add to your MCP config:

{
  "mcpServers": {
    "solmail": {
      "command": "npx",
      "args": ["-y", "solmail-mcp"],
      "env": {
        "SOLANA_NETWORK": "devnet",
        "SOLANA_PRIVATE_KEY": "your_base58_private_key"
      }
    }
  }
}

Features

  • Physical Mail -- Letters printed and mailed to 200+ countries via Lob.com
  • Solana Payments -- Pay with SOL on devnet (testing) or mainnet (production)
  • Non-Custodial -- Direct wallet control, no intermediaries
  • AI-Native -- Built specifically for MCP agent integration
  • Demo Mode -- Test with devnet SOL and Lob test API at zero cost

Tools (4)

Usage Example

You: Send a thank you note to John Doe at 123 Main St, San Francisco, CA 94102

Claude: [calls get_mail_quote] Cost: $1.50 (~0.015 SOL) for domestic US mail
        [calls send_mail] Letter sent!
          Letter ID: ltr_abc123
          Tracking: 9400000000000000000000
          Payment: 0.015 SOL (tx: 5j7s...)
          Delivery: 3-5 business days

How It Works

Agent composes letter --> MCP validates address --> Solana tx signed
    --> Payment sent to merchant --> SolMail verifies on-chain
    --> Lob.com prints letter --> USPS delivers --> Tracking returned

Pricing

Configuration

Important: Create a dedicated wallet with limited funds for AI agents. Never use your primary wallet.

Development

npm install && npm run build
npm run dev    # Watch mode
npm start      # Production

Related Projects

  • solana-mcp-server-app -- Solana wallet + DeFi MCP
  • coldstar-colosseum -- Air-gapped Solana vault
  • ordinals-mcp -- Bitcoin Ordinals MCP server
  • cpanel-mcp -- cPanel hosting MCP server

Contributing

  1. Fork the repository
  2. Create your feature branch (git checkout -b feature/my-feature)
  3. Commit your changes
  4. Open a Pull Request

Links

  • Website | npm | MCP Docs

License

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Solmail: common questions

Is Solmail MCP server safe?
Mostly: it is graded B (83/100). Read the Solmail safety report
How do I install Solmail?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Solmail need an API key?
Yes. The registry entry asks for SOLANA_PRIVATE_KEY.
Is Solmail maintained?
The last commit was 57 days ago (2026-09-08). The latest release is v1.0.2.
How does Solmail compare with other MCP servers?
safety score 83/100 (higher than 65% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 25% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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