chadex is a non-custodial peer-to-peer ERC-20/ERC-20 decentralised exchange protocol.
- Users permit the chadex smart contract to perform ERC-20 token transfers
- Users express their desire to exchange ERC-20 tokens to other ERC-20 tokens by adding orders to the exchange
- If the prices match between users, the exchange takes place.
Fully on-chain ERC-20/ERC-20 DEX using Red-Black Trees and queues for sorted orderbook executions.
Status: Work in progress
https://bokkypoobah.github.io/chadex/
npm install --save-dev @nomiclabs/hardhat-truffle5 @nomiclabs/hardhat-web3 web3
https://docs.openzeppelin.com/test-helpers/0.5/
npm install --save-dev @openzeppelin/test-helpers npm install --save-dev solidity-coverage
npm install --save-dev @nomiclabs/hardhat-ethers 'ethers@^5.0.0'
Coverage
Run coverage reports using the command
npx hardhat coverage
Output will be in the generated coverage directory
If you are using yarn, you can run
yarn hardhat coverage
Token incompatibilities - An Incompatibility in Ethereum Smart Contract Threatening dApp Ecosystem
- Token registry includes rating
- 0 scam, 1 suspect, 2 unrated, 3 OK, 5 reputable
- Prevent front running
hash(ccy1/ccy2) => Orderbook
Orderbook RedBlackTree index by price buyOrders - Expiring Queue => Order * OrderType orderType; * address baseToken; // GNT * address quoteToken; // ETH * uint price; // GNT/ETH = 0.00054087 = #quoteToken per unit baseToken * uint expiry; * uint amount; // GNT - baseToken sellOrders
TODO:
- Move past consumed orders, graceful gas limit exit
- Handle canTransferFrom() - ethereum/EIPs#1594 `function canTransferFrom(address _from, address _to, uint256 _value, bytes _data) external view returns (bool, byte, bytes32);``
function trade(uint orderFlag, address baseToken, address quoteToken, uint price, uint expiry, uint baseTokens, address uiFeeAccount) public payable returns (uint _baseTokensFilled, uint _quoteTokensFilled, uint _baseTokensOnOrder, bytes32 _orderKey);| Parameters | Notes |
|---|---|
orderFlag |
uint256 |
baseToken |
address of the baseToken |
quoteToken |
address of the quoteToken |
price |
uint256 |
expiry |
uint256 |
baseTokens |
uint256 |
uiFeeAccount |
address |
And orderFlag is constructed using the following bitmasks
// Note that the BUY and SELL flags are used as indices
uint constant public ORDERTYPE_BUY = 0x00;
uint constant public ORDERTYPE_SELL = 0x01;
uint constant public ORDERFLAG_BUYSELL_MASK = 0x01;
// BK Default is to fill as much as possible
uint constant public ORDERFLAG_FILL = 0x00;
uint constant public ORDERFLAG_FILLALL_OR_REVERT = 0x10;
uint constant public ORDERFLAG_FILL_AND_ADD_ORDER = 0x20;