Web3 & Blockchain Security
Web3 and blockchain security is the practice of finding and stopping flaws in smart contracts, wallets, and onchain systems before attackers turn them into stolen funds. It covers static analysis and fuzzing of contract code during audits, local chain forks for testing fixes, and transaction screening that warns users before they sign. Because deployed contracts are hard to change and transfers are hard to reverse, most of this work happens before code goes live or before a transaction is approved.

Echidna
Echidna is a free open-source smart contract fuzzer used to break user-defined invariants in Ethereum contracts for auditors and security engineers.
Web3 & Blockchain SecurityFreeOpen source
Foundry
Foundry is a free open-source Solidity development and testing toolkit used to build, fuzz, and debug smart contracts for auditors and developers.
Web3 & Blockchain SecurityFreeOpen source
Slither
Slither is a free open-source static analyzer for Solidity and Vyper used to find smart contract vulnerabilities before deployment for auditors.
Web3 & Blockchain SecurityFreeOpen source
Blockaid
Blockaid is a paid web3 security platform used to detect and block crypto scams, wallet drainers, and onchain exploits for wallets and exchanges.
Web3 & Blockchain SecurityPaid