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paperplane is agent-native: the MCP endpoint and REST API are the product, and the website is just a client of them. No account, no API key, no monthly fee — every order carries its own payment.

MCP server

Three tools — quote_letter, send_letter, get_letter_status — for Claude and 20+ other MCP clients.

REST API

A full set of /v1/* endpoints, described in the API Reference tab.

Sandbox

Pass sandbox: true to exercise the entire flow for free, with simulated fulfillment and tracking.

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Every way to send

Web

The composer at /send — letters, cards, or postcards — plus a template gallery.

MCP

Claude and any MCP client.

Embed

One script adds the send flow to your own site.

Email

Forward an email and we mail it.

Text/SMS

Text a recipient and a letter, confirm, done.

REST

Any HTTP client — see the API Reference tab.

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What you get

Preview

The exact PDF before paying.

Track

Any mailed letter at a shareable public URL.

Cancel

Before print, releasing any payment hold — from the web or the API.

Webhooks

Pushed to your webhook_url on every status change.

Integrations

Zapier/n8n/Make via REST + webhooks today, native apps on the roadmap.

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Use it right now

Quickstart

Compose and send your first letter.

Teach an agent (MCP)

Connect Claude or any MCP client in one command.

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What it costs

Postcards and the notecard are a separate format, not a mail class — priced per piece, postage included: 1.99∗∗(4x6),∗∗1.99** (4x6), **2.99 (6x9), 3.49∗∗(6x11),∗∗3.49** (6x11), **5.99 for the notecard (folded and enclosed, not open-face like a postcard). Message-only for now (no custom photo/artwork side); see Mail formats. Each order is paid individually (Stripe link or prepaid credit code). No subscription, no account.

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Content rules

Every letter is screened before printing. Lawful demand letters and firm legal language are explicitly allowed; threats, fraud, and impersonation are refused and the payment released.
Last modified on September 15, 2026