This contract is an implementation of the ERC20 token standard. It provides basic token functionality such as transferring tokens, checking balances, and managing allowances. It also includes functions for initializing the token's name and symbol.

This contract is a mock implementation of the ERC3156FlashBorrowerUpgradeable interface. It allows for flash loans, emits events for balance and total supply, and provides an option to enable or disable loan approval and return functionality.

This contract provides functions for verifying Merkle Tree proofs and reconstructing Merkle trees from proofs. It supports both memory and calldata versions of the functions. It also includes a warning about potential vulnerabilities when using leaf values that are 64 bytes long prior to hashing.

This contract is a signature verification helper that supports both ECDSA signatures from externally owned accounts (EOAs) and ERC1271 signatures from smart contract wallets. It provides functions to check if a signature is valid for a given signer and data hash, using either `ECDSA.recover` or `ERC1271.isValidSignature`.

This contract implements a flash loan mechanism for ERC20 tokens. It allows users to borrow tokens temporarily, provided they implement the `IERC3156FlashBorrower` interface. The contract calculates the maximum loan amount and fees, mints tokens to the borrower, executes the loan, and ensures the borrowed tokens and fees are returned or burned at the end of the loan.

This contract implements a vesting wallet that allows for the gradual release of native tokens (ether) and ERC20 tokens to a beneficiary over a specified duration. The release of tokens is based on a linear vesting curve. The contract also provides functions to retrieve information about the vesting schedule and the amount of tokens already released.

This contract is an upgradeable ERC20 token contract that allows users to deposit, mint, withdraw, and redeem assets. It supports conversion between assets and shares, with rounding options. It also sets the underlying asset contract and handles max limits for deposits, mints, withdrawals, and redemptions.

This contract implements access control functionality, allowing roles to be granted and revoked for specific accounts. It provides modifiers to restrict access based on roles and emits events when roles are granted or revoked.

This contract is an upgradeable implementation contract that follows the UUPS (Universal Upgradeable Proxy Standard) pattern. It provides functions to upgrade the contract's implementation and execute a function call on the new implementation. It includes modifiers to ensure that the execution is performed through a proxy and not delegated. It also includes functions to check the compatibility of the implementation during an upgrade.

This contract provides functionality for initializing and reinitializing contracts, with modifiers to protect initialization functions and prevent reinitialization. It also includes a function to lock the contract and prevent future reinitialization.

This contract is an upgradeable implementation of the ERC2771Forwarder interface. It allows for the execution of forward requests on behalf of a signer using the ERC-2771 protocol. The contract verifies the validity of the request, including the signature, value, and deadline. It also supports batch execution of multiple requests and handles refunding of unused value.

This contract is an upgradeable ERC20 token contract with a modified approve function. It ensures that if the spender already has an allowance, it cannot be increased unless the amount is zero. This prevents potential misuse of the token by limiting the spender's access.

0xmonsoon

Allarious

andresbach

CallMeGwei

canercidam

clarkhenry

cre-mer

cylon56

dylankilkenny

ericglau

ericnordelo

ernestognw

frangio

martriay

MCarlomagno

mwakaba2

nikitastupin

shahnami

sipox11

Vanclief

xdaluca

A library for secure and upgradeable smart contract development. Build on a solid foundation of community-vetted code. This project is maintained by OpenZeppelin with the goal of providing a secure and reliable library of smart contract components for the ecosystem. We address security through risk management in various areas such as engineering and open source best practices, scoping and API design, multi-layered review processes, and incident response preparedness.