The Best 3F Mutual Alternatives in 2026

Nexus Mutual offers crypto cover for risks including hacks and describes itself as an alternative to insurance.

OtterSec audits blockchain systems, including layer-one networks, wallets, DeFi protocols, bridges, and related infrastructure.

Ensuro offers digital insurance for embedded protection; its site reports policies sold and premiums collected.

OpenZeppelin Defender is documented within the official OpenZeppelin library and tools documentation.

Each Ethernaut level requires hacking a smart contract in the Ethereum Virtual Machine through a Web3 and Solidity wargame.

Tulipa Capital curates DeFi risk strategies and provides dashboards and partner information for its on-chain finance work.

Rekt publishes investigative journalism and commentary on crypto incidents, with a ranked archive of major blockchain losses.

AlphaPing operates non-custodial on-chain credit vaults with defined risk constraints, verifiable accounting, and liquidity rules.

B.Protocol Curator tracks data associated with B.Protocol's backstop pools for monitoring.

EverRise develops bridging and security applications for DeFi protocols across BNB Chain, Ethereum, Polygon, Fantom, and Avalanche.

Three Sigma audits blockchain code and DeFi systems, reporting security findings and services for Web3 projects.

Anvil runs a local Ethereum node for development and testing, with in-memory execution, funded accounts, instant mining, and chain forking.

StarkWare develops STARK proof technology for blockchain scalability, security, and privacy, with products including Starknet and StarkEx.

K3 Capital manages non-directional DeFi strategies such as interest-rate arbitrage, liquidity provision, and early protocol participation.

Sentora provides non-custodial DeFi vaults, real-time analytics, and risk management for capital deployment across decentralized finance.

Ouroboros Capital presents Yuzu Money yield products, including tokenized real-world asset yield and curated DeFi strategies.

Hyperithm uses systematic arbitrage across digital and traditional asset markets for market-neutral asset management.

Trail of Bits publishes security reviews, research, open-source tools, and talks covering software, blockchains, and AI systems.

Sigma Prime audits smart contracts, zero-knowledge systems, blockchain infrastructure, and off-chain code, and publishes security research.

Coinmerce Capital presents managed crypto investment funds including Core, Frontier, and Yield.

Chainalysis provides blockchain data and intelligence tools for investigating illicit activity, managing risk, and preventing crypto fraud.

Zellic provides security assessments for emerging technologies, using offensive security research to identify software vulnerabilities.

MEV Capital provides on-chain liquidity and DeFi risk management, including curated vaults and segregated managed accounts.

Gami Labs offers curated DeFi vaults and yield strategies for institutional allocators, with public and private vaults.