LIVE DEMO · REAL API · NOTHING MAILED

Send a letter in sandbox mode

This page calls the real paperplane API from your browser — the same endpoints AI agents and scripts use. You’ll compose a tiny letter, get a priced quote, then run a sandbox send: the full pipeline (address checks, content screening, simulated printing and tracking) with no signup, no payment, and nothing physically mailed. Every request and response appears below, verbatim.

Along the way you’ll see the part worth stealing: the confirmation-token contract that makes it safe to hand this API to an AI agent. A send is never the first call — and you can watch it refuse a tampered letter.