Send a letter from Mistral Vibe.

Add paperplane to Mistral Vibe’s config.toml 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 Mistral Vibe

Step 1

Add to ~/.vibe/config.toml

[[mcp_servers]]
name = "paperplane"
transport = "streamable-http"
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 Mistral Vibe? 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

[[mcp_servers]]
name = "paperplane"
transport = "streamable-http"
url = "https://sendpaperplane.com/api/mcp"

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Common questions

Is Mistral Vibe’s config the same shape as Codex CLI’s?

Both are TOML, but the key names don’t match — Vibe uses a [[mcp_servers]] array with name/transport/url fields. Copy the exact block above rather than adapting Codex CLI’s.

What tools does it 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.