Ship Your Constant Function AMM

Submit your complete protocol and run the full test suite. Earn the "cfamm-builder" badge on completion.

Over the past sections, you have built a complete Uniswap V2 style constant function AMM:

Pair contract: Token reserves, swap with 0.3% fee, slippage protection, reentrancy guard
LP tokens: ERC-20 minting/burning with sqrt formula and MINIMUM_LIQUIDITY
Factory: CREATE2 deployment of pairs with deterministic addresses
Router: Multi-hop swaps, optimal liquidity calculation, deadline enforcement
TWAP Oracle: Cumulative price tracking for manipulation-resistant price feeds

Paste your complete protocol code below. The test suite will verify all core functions exist and are implemented correctly.

You now have a working fork of the most widely deployed AMM in DeFi. From here you can:

Deploy to a testnet and verify on Etherscan
Modify the fee structure (different fee tiers, protocol fees)
Add flash loan support (Uniswap V2's swap callback)
Build a frontend to interact with your protocol
Run the Zealynx Krait security checklist against your code for a full security review

This is real. You built it. You understand every line.

Solution.sol

Solidity

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