PayPlic - A Crypto to Crypto Gatway

By PayPlic Team for XDC dAPP Summer Hackathon - 2022

PayPlic enables a cross-chain gateway, from Ethereum Blockchain to XDC Network Blockchain. XDC EcoSystem can create a bridge that allows users from other blockchains can purchase XDC Token easily

Inspiration

Crypto to Crypto Gateway is a bridge between two blockchains. For an instance, a USDT holder in Ethereum can purchase tokens from the XDC Ecosystem.

What it does

• Crypto to Crypto Gateway is a bridge between two blockchains. For an instance, a USDT holder in Ethereum can purchase tokens from the XDC Ecosystem.
• Token founders, can sign-up with their ERC20 wallet and get an API Key.
• Using this API Key, they can enable crypto payment in USDT / USDC / DAI and they can decide which token to pair with
• Deposit their funds in the XRC20 Gateway contract
• User should be able to purchase using the stablecoins and get the relevant XDC Token

How we built it

• ERC20 Gateway Solidity Contract
• XRC20 Gateway Solidity Contract
• Plugin Decentralized Oracle for bridge
• External Adapter to pull the pricing of XDC EcoSystem from the external world

Challenges we ran into

Accomplishments that we're proud of

• Bridge has been enabled between the blockchains.
• This can be taken to any EVM-compatible blockchains.

What we learned

• Integration of two different blockchains.
• How to bridge using the event mechanism

What's next for Crypto2Crypto Gateway - PayPlic

• Building a nice user interface
• Create a widget, so anyone can integrate this widget into their website

How to Run

Installation

Node.js v10+ to run. Install the dependencies and devDependencies and start the server.

git clone https://github.com/LogeswaranA/PayPlic.git
cd PayPlic

Install necessary packages for app folder and start backend api

cd app
yarn install
yarn start

Result should be something like below

Compiled successfully!
You can now view client in the browser.
  Local:            http://localhost:3000
  On Your Network:  http://192.168.1.36:3000
Note that the development build is not optimized.
To create a production build, use yarn build.

Install necessary packages for external-adapter folder and start backend api

''' cd external-adapter yarn install yarn start ''' Result should be something like this ''' yarn run v1.22.19 $ node server.js Listening on port 5002! '''

Install necessary packages for xrcserver folder and start backend api

''' cd xrcserver yarn install yarn start ''' Result should be something like this ''' yarn run v1.22.19 $ node server.js Listening on port 5001! '''

Start Plugin node & EXternal-initiator

• Follow plugin node setup guide https://docs.goplugin.co/plugin-installations/how-to-install-plugin-node/modular-method-deployment-recommended-approach
• Make sure, your node is pointed to "Apothem" network
• Create a bridge in Plugin UI & point that to 5002, so the plugin & external-initiator can communicate with external-adapter