PeerTradeX

Overview

Summary

PeerTradeX is an Automated Trades platform where buyers can choose supported ERC20 tokens and their desired target tokens for exchange. They can also select their preferred exchange rates through the user interface (UI). Once the interaction is completed on the UI, the buyers can deposit their ERC20 tokens into the smart contract. Similarly, sellers can perform similar actions by selecting exchange rates that they find suitable. We will then search for orders in the contract pool that match the desired exchange rates until the specified token quantity from the user is reached. Upon completion of the transaction, the corresponding token quantity will be automatically sent to the seller. All transactions are conducted automatically based on the user's set ratio and the smart contract.

Flowchart

Code Snippet

Sell

//caculate current offer raito
uint256 raito = initiatorAmount.mul(baseRaito).div(counterPartyAmount);

//instanceId++
instanceId.increment();

//Instance struct.
Instance memory instance = Instance({
    id: instanceId.current(),
    initiator: msg.sender,
    initiatorERC20: initiatorERC20,
    initiatorAmount: initiatorAmount,
    counterPartyERC20: counterPartyERC20,
    counterPartyAmount: counterPartyAmount,
    raito: raito,
    state: State.BEGUN
});

//update orderBook list.
instances.push(instance);

//update user order list.
userOrder[msg.sender].push(instance);

Buy

for (uint256 i = 0; i < instances.length; ) {
Instance storage instance = instances[i];

//if raito is suitable then make a deal.
if (
    counterPartyMaxAmount > 0 &&
    instance.raito >= expectRaito &&
    counterPartyMaxAmount >= instance.counterPartyAmount
) {
    //transfer token to initiatorERC20 user , the amount he expect.
    IERC20(counterPartyERC20).safeTransfer(
        instance.initiator,
        instance.counterPartyAmount
    );

    //transfer initiatorERC20 to buyer.
    IERC20(initiatorERC20).safeTransfer(
        msg.sender,
        instance.initiatorAmount
    );

    //reduce
    counterPartyMaxAmount -= instance.counterPartyAmount;

    //delete instances list.
    idsToDelete[index] = instance.id;

    //update user Order.
    finishInstance(instance.id, instance.initiator);
}

Deploy Contract

npm i
cd contract
//deploy faucet tokens.
npx hardhat run scripts/faucet.js --network zen
//deploy main contract using 2 faucet token addresses.
npx hardhat run scripts/swap.js --network zen

Support Chains

Gobi Testnet

Document tree

$ tree -d -L 2 -I 'node_modules'
PeerTradeX
├── cache
├── components     | react components
├── contracts      | hardhat contracts
│   ├── artifacts
│   ├── cache
│   ├── contracts  |conrtacts .sol file
│   ├── scripts
│   ├── src
│   └── test       |foundry test case
├── lib            |foundry libs
│   ├── forge-std
│   └── openzeppelin-contracts
├── out
├── pages          |react pages
│   └── api
├── public         |root
│   └── network
├── services
├── styles         |css
└── utils          |json file.

Test

cd contract
forge test --match-contract SwapTest -vvv

Compiler run successful (with warnings)

Running 3 tests for contracts/test/Swap.t.sol:SwapTest
[PASS] testGetSwapRang() (gas: 836599)
[PASS] testOfferAndBuy() (gas: 1182303)
[PASS] testTokenNotSupport() (gas: 13202)
Test result: ok. 3 passed; 0 failed; finished in 2.01ms

Reference

[1] tailwindcss https://tailwindcss.com/
[2] dasyUi https://daisyui.com/
[3] next.js https://nextjs.org/
[4] ether.js https://docs.ethers.org/v6/
[5] hardhat https://hardhat.org/
[6] foundry https://book.getfoundry.sh/forge/writing-tests

License

SPDX short identifier: MIT

coffiasd/PeerTradeX