Address Contract Verified
Address
0xB729aef059C43DF124ED5B916cecCE83EC78724b
Balance
0 ETH
Nonce
1
Code Size
12116 bytes
Creator
0xb9B09B9B...CC98 at tx 0xa3dc059c...dfc353
Indexed Transactions
0
Contract Bytecode
12116 bytes
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Verified Source Code Full Match
Compiler: v0.8.30+commit.73712a01
EVM: prague
Optimization: No
USDCSavingsBank.sol 301 lines
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
/**
* @title USDCSavingsBank
* @dev Smart contract for USDC savings boxes with two types
*
* Type 1 (Simple): Lock USDC until target amount is reached, no withdrawals until goal
* Type 2 (Flexible): Lock USDC until target amount, but can withdraw up to 1/3, must repay before next withdrawal
*/
interface IERC20 {
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
function transfer(address recipient, uint256 amount) external returns (bool);
function balanceOf(address account) external view returns (uint256);
}
contract USDCSavingsBank {
enum BoxType {
Simple, // Cannot withdraw until target reached
Flexible // Can withdraw max 1/3, must repay before next withdrawal
}
struct SavingsBox {
BoxType boxType; // Type of savings box
uint256 targetAmount; // Target amount to save
uint256 currentBalance; // Current saved amount
uint256 withdrawnAmount; // Amount withdrawn (for Flexible type)
address owner; // Owner of the box
uint256 createdAt; // Creation timestamp
bool isActive; // Is box active
}
// USDC token address
address public immutable usdcToken;
// User address => array of savings boxes
mapping(address => SavingsBox[]) public userBoxes;
// Events
event BoxCreated(
address indexed user,
uint256 indexed boxId,
BoxType boxType,
uint256 targetAmount
);
event Deposited(
address indexed user,
uint256 indexed boxId,
uint256 amount,
uint256 newBalance
);
event Withdrawn(
address indexed user,
uint256 indexed boxId,
uint256 amount,
uint256 remainingBalance
);
event Repaid(
address indexed user,
uint256 indexed boxId,
uint256 amount,
uint256 newWithdrawnAmount
);
event BoxClosed(
address indexed user,
uint256 indexed boxId,
uint256 finalAmount
);
/**
* @dev Constructor sets USDC token address
* @param _usdcToken Address of USDC token contract
*/
constructor(address _usdcToken) {
require(_usdcToken != address(0), "Invalid USDC address");
usdcToken = _usdcToken;
}
/**
* @dev Create a new savings box
* @param boxType Type of box (0 = Simple, 1 = Flexible)
* @param targetAmount Target amount to save (in USDC with 6 decimals)
*/
function createSavingsBox(
BoxType boxType,
uint256 targetAmount
) external returns (uint256 boxId) {
require(targetAmount > 0, "Target must be > 0");
require(targetAmount <= 1_000_000 * 10**6, "Max 1M USDC");
SavingsBox memory newBox = SavingsBox({
boxType: boxType,
targetAmount: targetAmount,
currentBalance: 0,
withdrawnAmount: 0,
owner: msg.sender,
createdAt: block.timestamp,
isActive: true
});
userBoxes[msg.sender].push(newBox);
boxId = userBoxes[msg.sender].length - 1;
emit BoxCreated(msg.sender, boxId, boxType, targetAmount);
return boxId;
}
/**
* @dev Deposit USDC to savings box
* @param boxId Index of the box
* @param amount Amount to deposit
*/
function deposit(uint256 boxId, uint256 amount) external {
require(boxId < userBoxes[msg.sender].length, "Invalid boxId");
SavingsBox storage box = userBoxes[msg.sender][boxId];
require(box.isActive, "Box not active");
require(box.owner == msg.sender, "Not owner");
require(amount > 0, "Amount must be > 0");
// Transfer USDC from user to contract
IERC20 usdc = IERC20(usdcToken);
require(
usdc.transferFrom(msg.sender, address(this), amount),
"USDC transfer failed"
);
box.currentBalance += amount;
emit Deposited(msg.sender, boxId, amount, box.currentBalance);
}
/**
* @dev Withdraw from savings box
* @param boxId Index of the box
* @param amount Amount to withdraw (0 = withdraw all for Simple type when target reached)
*/
function withdraw(uint256 boxId, uint256 amount) external {
require(boxId < userBoxes[msg.sender].length, "Invalid boxId");
SavingsBox storage box = userBoxes[msg.sender][boxId];
require(box.isActive, "Box not active");
require(box.owner == msg.sender, "Not owner");
require(box.currentBalance > 0, "No balance");
if (box.boxType == BoxType.Simple) {
// Simple type: can only withdraw when target is reached
require(box.currentBalance >= box.targetAmount, "Target not reached");
// Withdraw all
uint256 withdrawAmount = box.currentBalance;
box.currentBalance = 0;
box.isActive = false;
IERC20 usdc = IERC20(usdcToken);
require(
usdc.transfer(msg.sender, withdrawAmount),
"USDC transfer failed"
);
emit Withdrawn(msg.sender, boxId, withdrawAmount, 0);
emit BoxClosed(msg.sender, boxId, withdrawAmount);
} else {
// Flexible type: can withdraw up to 1/3, but must repay before next withdrawal
require(box.withdrawnAmount == 0, "Must repay previous withdrawal");
require(amount > 0, "Amount must be > 0");
uint256 maxWithdraw = box.currentBalance / 3;
require(amount <= maxWithdraw, "Cannot withdraw more than 1/3");
box.currentBalance -= amount;
box.withdrawnAmount = amount;
IERC20 usdc = IERC20(usdcToken);
require(
usdc.transfer(msg.sender, amount),
"USDC transfer failed"
);
emit Withdrawn(msg.sender, boxId, amount, box.currentBalance);
}
}
/**
* @dev Repay withdrawn amount (Flexible type only)
* @param boxId Index of the box
* @param amount Amount to repay
*/
function repay(uint256 boxId, uint256 amount) external {
require(boxId < userBoxes[msg.sender].length, "Invalid boxId");
SavingsBox storage box = userBoxes[msg.sender][boxId];
require(box.isActive, "Box not active");
require(box.owner == msg.sender, "Not owner");
require(box.boxType == BoxType.Flexible, "Only for Flexible type");
require(box.withdrawnAmount > 0, "Nothing to repay");
require(amount > 0 && amount <= box.withdrawnAmount, "Invalid amount");
// Transfer USDC from user to contract
IERC20 usdc = IERC20(usdcToken);
require(
usdc.transferFrom(msg.sender, address(this), amount),
"USDC transfer failed"
);
box.currentBalance += amount;
box.withdrawnAmount -= amount;
emit Repaid(msg.sender, boxId, amount, box.withdrawnAmount);
}
/**
* @dev Close box and withdraw all (Flexible type when target reached)
* @param boxId Index of the box
*/
function closeBox(uint256 boxId) external {
require(boxId < userBoxes[msg.sender].length, "Invalid boxId");
SavingsBox storage box = userBoxes[msg.sender][boxId];
require(box.isActive, "Box not active");
require(box.owner == msg.sender, "Not owner");
require(box.boxType == BoxType.Flexible, "Only for Flexible type");
require(box.currentBalance >= box.targetAmount, "Target not reached");
require(box.withdrawnAmount == 0, "Must repay all withdrawals");
uint256 finalAmount = box.currentBalance;
box.currentBalance = 0;
box.isActive = false;
IERC20 usdc = IERC20(usdcToken);
require(
usdc.transfer(msg.sender, finalAmount),
"USDC transfer failed"
);
emit BoxClosed(msg.sender, boxId, finalAmount);
}
/**
* @dev Get all savings boxes for a user
*/
function getUserBoxes(address user) external view returns (SavingsBox[] memory) {
return userBoxes[user];
}
/**
* @dev Get single box details
*/
function getBox(address user, uint256 boxId) external view returns (SavingsBox memory) {
require(boxId < userBoxes[user].length, "Invalid boxId");
return userBoxes[user][boxId];
}
/**
* @dev Get number of boxes for user
*/
function getBoxCount(address user) external view returns (uint256) {
return userBoxes[user].length;
}
/**
* @dev Check if target is reached
*/
function isTargetReached(address user, uint256 boxId) external view returns (bool) {
require(boxId < userBoxes[user].length, "Invalid boxId");
SavingsBox memory box = userBoxes[user][boxId];
return box.currentBalance >= box.targetAmount;
}
/**
* @dev Get available withdrawal amount (for Flexible type)
*/
function getAvailableWithdrawal(address user, uint256 boxId) external view returns (uint256) {
require(boxId < userBoxes[user].length, "Invalid boxId");
SavingsBox memory box = userBoxes[user][boxId];
if (box.boxType != BoxType.Flexible || !box.isActive) {
return 0;
}
if (box.withdrawnAmount > 0) {
return 0; // Must repay first
}
return box.currentBalance / 3;
}
/**
* @dev Get contract USDC balance
*/
function getContractBalance() external view returns (uint256) {
return IERC20(usdcToken).balanceOf(address(this));
}
}
Read Contract
getAvailableWithdrawal 0x9bc9fec9 → uint256
getBox 0x85edd715 → tuple
getBoxCount 0xa88b5c4f → uint256
getContractBalance 0x6f9fb98a → uint256
getUserBoxes 0x451d8f8f → tuple[]
isTargetReached 0xe36fcbe9 → bool
usdcToken 0x11eac855 → address
userBoxes 0x4a7f331c → uint8, uint256, uint256, uint256, address, uint256, bool
Write Contract 5 functions
These functions modify contract state and require a wallet transaction to execute.
closeBox 0x0fceb9ab
uint256 boxId
createSavingsBox 0x3a2a84f0
uint8 boxType
uint256 targetAmount
returns: uint256
deposit 0xe2bbb158
uint256 boxId
uint256 amount
repay 0xd8aed145
uint256 boxId
uint256 amount
withdraw 0x441a3e70
uint256 boxId
uint256 amount
Token Balances (1)
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