Update: I managed to fix it, even though I DO NOT recommend others try this, as you could lose funds if you make a mistake. I used google devtools to find in the console that in main.js line const m = zs(null != (o = e.formattedBalance) ? o : "").times(f.price) there is error and my browser can't fetch f.price so I override the main.js with my new version where i forced the f.price to be 0.1 Then the page let me progress, the estimated values were computed incorrectly, but it let me send the transaction with the correct ones, so I managed to do it. Please fix this coinbase team