name: openzeppelin-contracts
description: Secure smart contract library—access control, tokens (ERC20/721/1155/4626/6909), upgradeable contracts, and utilities.
metadata:
author: hairy
version: "2026.2.9"
source: Generated from https://github.com/OpenZeppelin/openzeppelin-contracts, scripts at https://github.com/antfu/skills
Skill based on OpenZeppelin Contracts (docs as of 2026-02-09), generated from sources/openzeppelin.
OpenZeppelin Contracts is a library for secure smart contract development on EVM. Use via inheritance (e.g. ERC20, AccessControl) or using for (e.g. ECDSA, Math). Covers access control (Ownable, RBAC, AccessManager, TimelockController), tokens (ERC20, ERC721, ERC1155, ERC4626, ERC6909), upgradeable variants, and utilities (crypto, math, introspection, structures, storage).
Core References
| Topic |
Description |
Reference |
| Overview |
Library usage, inheritance, extending contracts |
core-overview |
| Access Control |
Ownable, AccessControl (RBAC), AccessManager, TimelockController |
core-access-control |
| Tokens |
Token standards and when to use ERC20/721/1155/4626/6909 |
core-tokens |
| ERC20 |
Fungible tokens, decimals, transfer, supply |
core-erc20 |
| ERC721 |
Non-fungible tokens, URI storage, minting |
core-erc721 |
| ERC1155 |
Multi-token (fungible + NFT), batch ops, safe transfer to contracts |
core-erc1155 |
| ERC4626 |
Tokenized vaults, shares vs assets, inflation attack mitigation |
core-erc4626 |
| ERC6909 |
Multi-asset (no batch/callbacks), granular approvals, extensions |
core-erc6909 |
| ERC20 Supply |
Creating supply with _mint and _update, fixed and reward patterns |
core-erc20-supply |
Features
Upgradeable
| Topic |
Description |
Reference |
| Upgradeable Contracts |
contracts-upgradeable, initializers, namespaced storage |
features-upgradeable |
Governance & Accounts
| Topic |
Description |
Reference |
| Account Abstraction |
ERC-4337 stack: UserOperation, EntryPoint, Bundler, Paymaster |
features-account-abstraction |
| Governor |
On-chain governance, ERC20Votes, quorum, timelock, proposal lifecycle |
features-governance |
| Multisig |
ERC-7913 signers, threshold and weighted multisig with Account |
features-multisig |
| Smart Accounts |
ERC-4337 Account, signers, factory, UserOp, batched execution |
features-accounts |
| EOA Delegation |
EIP-7702 delegation to contracts, SignerEIP7702, authorization |
features-eoa-delegation |
Utilities
| Topic |
Description |
Reference |
| Utilities |
ECDSA, MerkleProof, Math, ERC165, structures, StorageSlot, Multicall |
features-utilities |
Best Practices
By