This smart contract facilitates a token presale with support for USDT, USDC, and ETH. It allows buyers to purchase presale tokens during a defined time window across multiple pricing phases. The contract uses Chainlink’s decentralized price feed to fetch the real-time ETH price, ensuring accurate USD-value calculations for ETH contributions.
- 🧪 Fully tested with Foundry, achieving 98%+ line and statement coverage.
- 🔐 Owner-managed access and emergency controls.
- 📊 Chainlink Data Feed Integration for real-time ETH/USD pricing.
- 📈 Phase-based pricing with automatic progression based on time or token limits.
⚠️ Blacklist support to exclude specific addresses.- 🎟️ Token claiming available post-sale.
When a user buys tokens during the presale, the contract first checks that the presale is active and the user is not blacklisted. If paying with ETH, it fetches the real-time ETH/USD price via Chainlink to calculate the token amount; for stablecoins (USDT/USDC), it uses the fixed price set for the current phase. The user's claimable tokens are recorded, funds are sent to the designated receiver, and an event is emitted. After the presale ends, users can claim their allocated tokens.
| Function | Description |
|---|---|
buyPresaleWithStable() |
Purchase tokens using USDT or USDC. |
buyPresaleWithETH() |
Purchase tokens using ETH; price fetched via Chainlink. |
claimTokens() |
Claim purchased tokens after presale ends. |
getETHPrice() |
Returns current ETH/USD price from Chainlink price feed. |
getPresaleTokens() |
Owner function to deposit tokens into the contract for distribution. |
checkCurrentPhase() |
Private function to update the phase based on time or amount sold. |
blacklistUser() |
Owner function to blacklist a user from participating. |
removeBlacklist() |
Owner function to remove a user from the blacklist. |
emergencyWithdrawERC20() |
Withdraw any ERC20 tokens from the contract (owner only). |
emergencyWithdrawETH() |
Withdraw ETH from the contract in case of emergency (owner only). |
| File | % Lines | % Statements | % Branches | % Functions |
|---|---|---|---|---|
src/Presale.sol |
98.46% (64/65) | 98.53% (67/68) | 76.92% (20/26) | 100.00% (11/11) |
test/Presale.t.sol |
100.00% (2/2) | 100.00% (1/1) | 100.00% (0/0) | 100.00% (1/1) |
| Total | 98.51% (66/67) | 98.55% (68/69) | 76.92% (20/26) | 100.00% (12/12) |
Deploy the contract with the following parameters:
tokenAddress_: ERC20 token being sold.dataFeedAddress_: Chainlink ETH/USD price feed address.USDT_,USDC_: Addresses for stablecoins.fundsReceiver_: Address where funds will be sent.maxSellingAmount_: Total tokens to be sold.phases_: Array of[amount, price, time]for each sale phase.startTime_,endTime_: Presale time window.
- Use
buyPresaleWithStable(token, amount)with USDT or USDC. - Use
buyPresaleWithETH()to buy with ETH; real-time conversion via Chainlink.
- Call
claimTokens()after the presale ends to retrieve purchased tokens.
- Use
getPresaleTokens()to deposit the tokens being sold. - Use
blacklistUser()orremoveBlacklist()to manage participation. - Use emergency withdraw functions if necessary.