Instructions for Using LiquidityPool

Description: This is a liquidity pool contract for an Automated Market Maker (AMM),
similar to Uniswap or PancakeSwap. It creates your own market for swapping ETH and your ERC-20 token.
Liquidity Providers (LPs) contribute ETH and tokens in equal proportions, while traders swap them using the
formula x * y = k (constant product). LPs earn a 0.3% fee on each trade proportional to their share.
Difference from PancakeSwap: Unlike PancakeSwap, which is a ready-made exchange with multiple pools,
a user-friendly website, and thousands of users, LiquidityPool is your personal pool that you create and
control yourself. PancakeSwap offers infrastructure (website, routing, analytics), while here you decide how to
organize trading — via Etherscan or your own interface. This gives you full control but requires more effort to
attract traders.
What it offers: Decentralized swapping without intermediaries, passive income for LPs, and liquidity
for your token. For example, add 1 ETH and 1000 tokens, and people can trade through your pool while you earn fees.

Compilation: Go to the "Deploy Contracts" page in BlockDeploy,
paste the code into the "Contract Code" field (it imports OpenZeppelin for ERC-20 functionality),
select Solidity version 0.8.10 from the dropdown menu,
click "Compile" — the "ABI" and "Bytecode" fields will populate automatically.

Deployment: In the "Deploy Contract" section:

• Select the network (e.g., Ethereum Mainnet ),
• Enter the private key of a wallet with ETH into the "Private Key" field,
• Specify the address of your ERC-20 token (e.g., 0xYourTokenAddress) as the constructor parameter,
• Click "Deploy" and confirm in the modal window. After deployment, you’ll get the pool address (e.g., 0xYourPoolAddress).

How to Set Up and Use the Liquidity Pool:
Here’s a step-by-step guide to creating and working with your pool:

• Create an ERC-20 Token: If you don’t have a token, use SimpleToken from BlockDeploy.
  Deploy it (e.g., "MyToken", "MTK", 18 decimals, 1,000,000 tokens) and note its address (e.g., 0xYourTokenAddress).
• Add Liquidity: Call addLiquidity.
  • In the token’s interface, call approve, specifying the pool address (0xYourPoolAddress) and amount (e.g., 1000 MTK).
  • In BlockDeploy, locate the pool, select addLiquidity, enter 1000 MTK, and send 1 ETH with the transaction.
  • The first LP sets the ratio (1 ETH = 1000 MTK), and subsequent LPs must follow it.
• Best Way to Trade — via Etherscan "Write Contract":
  • Verify the Contract: After deployment, go to Etherscan (etherscan.io), find your contract by address.
    Go to the "Contract" tab → "Verify and Publish," paste the contract code, select Solidity 0.8.10, enter the token address in the constructor, and verify.
  • Trading: After verification, in the "Write Contract" tab:
  1. Connect MetaMask via "Connect to Web3".
  2. For swapEthForToken: enter minTokensOut (e.g., 0 for simplicity), specify the ETH amount in the "Value" field (e.g., 0.1 ETH), click "Write," and confirm.
  3. For swapTokenForEth: first approve tokens via the token (approve), then enter tokenAmount (e.g., 100 MTK) and minEthOut (0), click "Write".
  • Why this is the best way: It’s more convenient than manually via MetaMask, doesn’t require a website, shows all functions, but the contract must be verified for "Write" access.
• Remove Liquidity: Via Etherscan "Write Contract," call removeLiquidity,
  specifying the liquidity amount (e.g., your share in wei) to withdraw ETH and tokens.
• Check the Price: Via "Read Contract" on Etherscan, call getTokenPrice,
  to see the current token price in ETH (in wei).