A Move implementation of an Automated Market Maker (AMM) DEX on Rooch blockchain.
- Liquidity pool creation
- Adding liquidity
- Token swapping
- Constant product formula (x*y=k)
- 0.1%, 0.5%, 1.0% swap fee
- Slippage protection
const FEE_TIER_LOW: u256 = 1; // 0.1% fee
const FEE_TIER_MEDIUM: u256 = 5; // 0.5% fee
const FEE_TIER_HIGH: u256 = 10; // 1.0% fee
const FEE_DENOMINATOR: u256 = 1000;const ERROR_ZERO_AMOUNT: u64 = 1;
const ERROR_INSUFFICIENT_LIQUIDITY: u64 = 2;
const ERROR_SLIPPAGE: u64 = 3;
const ERROR_INVALID_RATIO: u64 = 4;Creates new liquidity pool for token pair
public fun create_pool<CoinTypeA: key + store, CoinTypeB: key + store>(
fee_tier: u256
): Object<LiquidityPool<CoinTypeA, CoinTypeB>>Add liquidity to pool with slippage protection
public fun add_liquidity<CoinTypeA: key + store, CoinTypeB: key + store>(
pool: &mut Object<LiquidityPool<CoinTypeA, CoinTypeB>>,
coin_a: Coin<CoinTypeA>,
coin_b: Coin<CoinTypeB>,
min_a: u256,
min_b: u256,
): boolRemove liquidity to pool with slippage protection
public fun remove_liquidity<CoinTypeA: key + store, CoinTypeB: key + store>(
pool: &mut Object<LiquidityPool<CoinTypeA, CoinTypeB>>,
amount_a: u256,
amount_b: u256
): boolSwap tokens with slippage protection
public fun swap<CoinTypeA: key + store, CoinTypeB: key + store>(
pool: &mut Object<LiquidityPool<CoinTypeA, CoinTypeB>>,
coin_in: Coin<CoinTypeA>,
min_out: u256,
): Coin<CoinTypeB>- Minimum Liquidity Lock: Initial liquidity providers must provide minimum amounts to prevent manipulation
- Slippage Protection: Users can specify minimum output amounts for swaps
- Overflow Protection: Safe math operations to prevent numeric overflow/underflow
- Constant Product Invariant: Ensures k = x * y is maintained after each trade
- Input Validation:
- Non-zero amounts
- Valid fee tiers
- Sufficient balances
- Balance Verification: Pre and post-trade balance checks
- Front-running Mitigation: Time-weighted price calculations (planned)
- Create pool for token pair
- Add initial liquidity
- Users can:
- Add liquidity
- Create Pool
- Swap tokens
- Remove liquidity (to be implemented)
- Swap fee: 0.1%, 0.5%, 1.0%
- Constant product: k = x * y
- Output amount: (y * Δx) / (x + Δx)
- Price impact increases with larger swaps
Apache-2.0