Send a letter from Devin CLI.

Add paperplane to Devin CLI with one command and it can quote and send a real USPS letter — no account required, free sandbox mode included.

Free to preview — see the exact PDF before you pay. Sending starts at $1.99, no account required.

Set it up in Devin CLI

Step 1

Connect

devin mcp add paperplane --url https://sendpaperplane.com/api/mcp

Try it: free, nothing mailed

Tell your agent:

Using the paperplane tools, quote a 1-page certified letter to Property LLC, 1 Main St, Richmond VA 23220, then send it in sandbox mode.

Not on Devin CLI? Any surface works.

The same three calls from the CLI, any MCP client or plain REST. Sandbox is free and mails nothing.

Send a letter

devin mcp add paperplane --url https://sendpaperplane.com/api/mcp

All agents · API docs

Common questions

Where do I run the connect command?

From your terminal — devin mcp add paperplane --url, pointed at the MCP endpoint above.

What tools does Devin get?

quote_letter, send_letter, and get_letter_status for mailing, plus buy_credits for pre-funding sends. Postcards are live (from $1.99) via the REST API’s format field, though not yet an MCP tool argument.

How much does sending cost?

Letters start at $1.99 for First-Class; Certified Mail starts at $12.99. Sandbox mode is free.