Guides
How the mail works — for people, then for software.
Short notes, not a knowledge base. Start with sending a letter, then the list rate, then the hosted MCP server if an agent should mail for you.
Customer
How to send a letter
Sign in, compose or upload a PDF, choose a mail class, pay, and authorize the send. For people using the workspace.
Pricing
List rates and extras
First-Class $1.49, Certified $12.99, postcards $1.99. Extra pages, Electronic Return Receipt, credits, and how you pay.
Developers
Hosted MCP
Point Claude or Cursor at /api/mcp. Guest x402, org credits, or a Square checkout — no card numbers on the wire.