In-wallet BTC to ETH conversion options?

[Szymon 0]

Which non-custodial wallets allow exchanging BTC for ETH without leaving the app?

[Vier 0]

Atomic Wallet is one of the better ones. You can Atomic Wallet exchange BTC for ETH right from the exchange tab. It pulls rates from multiple providers, shows you the best available, and handles the swap securely. No need to send funds to an external service everything stays under your private keys. Works on mobile and desktop.