SHIELD SWAP

MEV Resistant Flashloanable DEX Aggregator

Live Demo

https://2022-eth-seoul-submission.vercel.app/

Technical Integration

Pool info aggregator for pathfinder

code

• https://github.com/fortoon21/JK_bridge/blob/c335665a3f99eb632d48bf190a028daea13b4f18/packages/aggregator/lib/viewer.ts
• this can fetch all pool info in 2-5 seconds by multicall

generated example

https://github.com/fortoon21/Shieldswap/blob/c335665a3f99eb632d48bf190a028daea13b4f18/packages/aggregator/data/v2/quickswap/poolInfos.json

The graph

Diagram

Used subgraph

https://thegraph.com/hosted-service/subgraph/0xfind/uniswap-v3-mumbai

• Success to integarte uniswap v3 in mumbai
• subgraph for quickswap mumbai and sushiswap mumbai is not available, we can add subgraph for those later

How we use The Graph

The graph is used for aggregating pool info. We are aggregating all pool informaion from event, but we can have better performance using The Graph.

Line of integration

https://github.com/fortoon21/JK_bridge/blob/c335665a3f99eb632d48bf190a028daea13b4f18/packages/aggregator/lib/viewer.ts#L218-L221

https://github.com/fortoon21/JK_bridge/blob/c335665a3f99eb632d48bf190a028daea13b4f18/packages/aggregator/lib/thegraph.ts#L5-L10

Polygon

Deployed Contracts

Route Proxy

• https://mumbai.polygonscan.com/address/0xE8cb4b4b47bFF4c12a599FdB13b751C4f41974Ff#code
• This is for handling aggregated swap

Success tx

• https://mumbai.polygonscan.com/tx/0x48754e8114f4a19e784910e732c0550944a30cb6a2e0d0dd6509becccdd998a5
• this is only one path because of testnet low liquidity

Token Viewer

• https://mumbai.polygonscan.com/address/0x1a2e1CCb2702A3c30Fb04A80918eA0d0f6C06D8A#code
• This is for aggregating info from token in multicall

Token Viewer

• https://mumbai.polygonscan.com/address/0x4a44b451d9239e60E5A3df7214b2c467b7148902#code
• This is for aggregating info from uniswap v2 type dex in multicall

Token Viewer

• https://mumbai.polygonscan.com/address/0x60D3e7ba1781281f04B316e79CF389460B2ddB31#code
• This is for aggregating info from uniswap v3 type dex in multicall

Others

All contract information is kept at https://github.com/fortoon21/Shieldswap/blob/ed969d0a5831a18f1e0c0deca6d79b54b6c132d0/packages/aggregator/address.json

How we use Polygon

We are aggregating pool info from quickswap, sushiswap, uniswap V3 deployed in Polygon Mumbai, then provider aggregated swap to user.

We deployed multicall viewer contract and swap contract in Polygon Mumbai.

Development

Frontend

cd packages/frontend
yarn                    // for the first time
yarn dev

Aggregator

cd packages/aggregator
yarn                    // for the first time
yarn test