Solmail
Let your coding agent quote, pay with Solana, and send real printed mail worldwide from chat instead of juggling a separate portal.
Overview
Solmail is a Build-phase MCP server that lets AI agents send physical mail worldwide with postage paid in Solana cryptocurrency.
What is this MCP server?
- stdio npm package solmail-mcp (v1.0.2) for Claude Code, Cursor, and other MCP hosts
- Pays for physical letters using Solana via SOLANA_PRIVATE_KEY and configurable mainnet-beta or devnet
- Environment hooks for SOLMAIL_API_URL and MERCHANT_WALLET settlement
- Enables AI agents to initiate real-world postal delivery, not just email or PDFs
- Secret-handling pattern documented for wallet keys in server.schema.json
- Server version 1.0.2
- npm package identifier solmail-mcp
- stdio transport
What problem does it solve?
You want real letters sent from an agent workflow but only have crypto rails and no turnkey postal API in your stack.
Who is it for?
Indie builders shipping agent-first products who need occasional physical mail (invites, notices, campaigns) and already operate a Solana wallet.
Skip if: Teams that only need email, lack crypto compliance appetite, or cannot safely store a hot wallet private key on the dev machine.
What do I get? / Deliverables
After registration, your agent can request physical mail through MCP tools while Solana handles payment against SolMail’s merchant wallet.
- Registered stdio MCP server exposing SolMail send-and-pay flows to your agent
- Configurable devnet versus mainnet-beta Solana settlement for mail orders
- Agent-callable path from chat to real-world postal fulfillment
Recommended MCP Servers
Journey fit
SolMail is wired in while you are building agent workflows and third-party hooks, not during early ideation or post-launch analytics alone. It is an MCP bridge to SolMail’s postal API and on-chain payment flow—classic integrations work for solo builders shipping agent-powered products.
How it compares
MCP postal + Solana payment bridge, not a generic email or document-generation skill.
Common Questions / FAQ
Who is solmail for?
Solo builders and indie hackers using Claude Code or Cursor who want their agent to send real printed mail paid with Solana, not just digital messages.
When should I use solmail?
Use it when you are integrating outbound physical correspondence into an agent workflow and are ready to configure Solana keys and test on devnet first.
How do I add solmail to my agent?
Install the solmail-mcp npm package, add a stdio MCP entry in your host config, and set SOLANA_PRIVATE_KEY plus SOLANA_NETWORK and optional SOLMAIL_API_URL and MERCHANT_WALLET.