Private keys, seed phrases, or any credential that can move funds. Sign-in is a signed message, which proves ownership without granting any power over the wallet.
One session cookie, so you stay signed in. No advertising or tracking cookies.
Polymarket public APIs (market data, read-only), Stripe (payments), and the hosting provider. We do not sell or share your data beyond what those services need to function.
Sign in and ask from the settings page, or write to us from the email on your account. We delete the wallet address, settings, and paper history. Stripe keeps payment records for as long as tax law requires.