# Uniswap V2

By [Trader Doge](https://paragraph.com/@trader-doge) · 2022-03-29

---

*   **X\*Y >= K**
    
*   **Pair of any two ERC20 coins:** (improvement over v1 where only ERC20/ETH pair is supported) + Router contract
    
*   **Flash Swaps:** (atomic transaction, bundle everything within 1 transaction):
    
*   **30bps transaction cost** (potentially 5bps fee)
    
*   **Price Oracle:** use price at beginning/end of a block / TWAP
    

Reference:

[https://uniswap.org/whitepaper.pdf](https://uniswap.org/whitepaper.pdf)

[https://github.com/Uniswap/v2-periphery/blob/master/contracts/examples/ExampleFlashSwap.sol](https://github.com/Uniswap/v2-periphery/blob/master/contracts/examples/ExampleFlashSwap.sol)

---

*Originally published on [Trader Doge](https://paragraph.com/@trader-doge/uniswap-v2)*