iOS and Android
The best option to connect the Coinbase app on your mobile phone to 1inch is by using the Coinbase internal browser.
Open the Coinbase app on your mobile phone;
click on the middle icon at the bottom to open the build-in browser;
click the header and type app.1inch.io in the URL field;
on https://app.1inch.io/, click on 'connect wallet', accept the Terms of Service and select the second connection option ‘Coinbase Wallet’.
Use the Coinbase internal browser for interaction with 1inch.
WalletConnect
To connect the Coinbase app on your mobile phone to a desktop browser, you can use the ‘WalletConnect’ option. Do not use this option to connect to a browser on your mobile phone.
In a desktop browser, go to https://app.1inch.io/;
click on 'connect wallet', then choose the wallet you would like to connect. A QR code will be displayed on the screen;
on your mobile phone, open the Coinbase app;
click on the gear icon in the bottom right corner, select the QR scanner;
point your phone camera to the QR code on the screen.
Now you can interact with 1inch in your desktop browser and confirm transactions from your phone.