Gasless UniSwap

This dApp enables decentralized swapping of ERC20 tokens without the need of holding ETH to pay for tx fee

Currently-supported network is Ropsten Ethereum Testnet

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Morpheus Labs forked this source code from https://github.com/yashnaman/gasless-uniswap as a reference source for gasless UniSwap demo. Users can explore, modify and test the protocol on Morpheus Labs SEED platform.

Since this is ISC License, for SEED platform users or any users who need to fork or clone this source code need to explicitly fork from this repo.

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Smart contract

In the folder gasless-uniswap

Installation

Run this cmd

npm install

Compile, deploy and init contracts on Ropsten testnet of Ethereum

• Create a file .secret containing the private key of some Ropsten account

• Run this cmd: truffle migrate --network ropsten

• Set the deployed contract addresses (printed from the above step) in the file src/js/config.js under the section config.ropsten

• On the Metamask, these contract addresses should also be added by using the Add Token/Custom Token. This is to visualize the tokens and their balances on Metamask wallet.

Notice

The process truffle migrate takes long time (about 30 minutes) for contract initialization

Frontend UI

Go to src directory

Installation

Run this cmd

npm install

Start the frontend

Run this cmd

npm run dev

Open web browser

http://0.0.0.0:9090/

How to test swap

1. Open web browser: http://0.0.0.0:9090/

2. Ensure Metamask connected to Ropsten

3. Click connect wallet to get connected to Metamask

4. For the You want to swap part, ensure that the currently-connected Metamask acccount has some tokens of the selected token to be swapped. Can use the account (whose private key is specified in the file .secret) that has run the truffle migrate cmd to send some tokens to

5. For the For part, can select any target token to be swapped with

6. For the send swapped tokens to part, enter some address to receive the tokens

7. For the Unlock Your Tokens part, ensure to click unlock token to permit the source token (at the You want to swap part) to be sent out for swap.

8. Click swap button and check if the entered address receives the tokens or not on Metamask wallet

Test transaction result on Ropsten

1. unlock token or permit tx

https://ropsten.etherscan.io/tx/0x9282b118c0da7135beb4454afcb1b38d84cf796cb48092b0bb9fd9ce26150481

2. swap tx

https://ropsten.etherscan.io/tx/0x3297b1e7d05c52d5bab0fb7f32e0eb01690ba8373593049436ffe4a1a39f0a24

How to test Add Liquidity

1. Open web browser: http://0.0.0.0:9090/

2. Ensure Metamask connected to Ropsten

3. Click connect wallet to get connected to Metamask

4. For the You want to swap part, ensure that the currently-connected Metamask acccount has some tokens of the selected token to be unlocked. Can use the account (whose private key is specified in the file .secret) that has run the truffle migrate cmd to send some tokens to. Then, click the button unlock token.

5. For the For part, do similarly to the step above

6. For the send Liquidity tokens to part, enter some address to receive the UNI-V2 tokens

7. Click Add Liquidity button and check if the entered address receives the UNI-V2 tokens or not on Metamask wallet

Test transaction result on Ropsten

1. unlock token or permit tx for the part You want to swap

https://ropsten.etherscan.io/tx/0xb627558cebd2500b42b79686d266217759b7ac9aec24dc21bf4c3f9cac1e4f1d

2. unlock token or permit tx for the part For

https://ropsten.etherscan.io/tx/0xe69447609a00a79af844a6f29648b2b241ba8995a68a1134a56839428ed5e085

3. Add Liquidity tx

https://ropsten.etherscan.io/tx/0x2874056a411d302977c521530df59fa8b247e206c3424dae33fe7f952578e6e2