DotRefill

Search amongst vouchers
Select amount
See how much DOT it would cost
Confirm transaction in Nova Wallet
Get confirmation

Inspiration

We are convinced, that Polkadot's main issue currently is the low level of usability and spend-ability of your assets.

What it does

DotRefill is a front layer for the popular Bitrefill, which is an e-commerce platform that lets you use cryptocurrencies, like Bitcoin and Ethereum, to purchase gift cards, eSIMs, and mobile phone top-ups.

How we built it

We planed the most convenient workflow with considering the end goal: the usability of DOT for real-life scenarios, like spending for utilities. Like a World of Warcraft subscription :) The planned flow is: 1) User opens app → searches f.e "Netflix" 2) App queries Bitrefill catalog → shows Netflix gift card 3) User taps → chooses $25 card 4) App fetches price → displays equivalent DOT amount 5) App launches Nova Wallet with transaction details (amount, recipient address) 6) User approves payment → wallet sends DOT 7) App listens or polls Bitrefill for invoice confirmation. 8) App displays confirmation screen with order receipt.

Challenges we ran into

We were dedicated to use React Native+Expo, but when we discovered, that the Reown / WalletConnect support for Polkadot is non-existing for React Native. So we switched to Flutter.

Accomplishments that we're proud of

We were able to set up the flow including (6). And it works with proper stability.

What we learned

Most of all, we learned how to Flutter in a beginner level, was interesting. Also, we get familiar with Polkadot devnet (Westend) and how to set up a proper unsigned transaction - and how to ask a signature for it in NovaWallet.

What's next for DotRefill

Instead of sending the purchased vouchers to the user's email, display them directly in the app
Implement other wallets possibly
Spending custom amount: you want to buy fuel voucher for 100 USD, and the fuel voucher provider offers only 50, 20 and 10 USD vouchers - DotRefill calculates it for you as 1x 50, 2x 20 and 1x 10 USD vouchers