DeFi under attack: April hacks cost the market nearly $800 million
April 2026 will go down in the history of decentralized finance as one of the bloodiest months in terms of security.
According to data from specialized analytical platforms, in the last four weeks alone, attackers managed to withdraw from DeFi protocols from 570to570to800 million depending on the calculation methodology (taking into account indirect losses, liquidations and the fall in the value of affected tokens). This makes April the worst month since the beginning of the year and one of the top 5 in terms of losses in the history of the industry.
What happened?
A series of attacks affected several major protocols on different blockchains - Ethereum, BNB Chain, Arbitrum and Solana. The schemes varied from classic reentrancy exploits to complex attacks on price oracles and the compromise of administrators' private keys.
Both little-known projects and protocols with a billion TVL, which have undergone audits multiple times, fell victim.
Why is this happening now?
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Liquidity fragmentation. The active growth of L2 solutions and new L1 has led to the same teams deploying dozens of copies of their contracts. An error in the base code instantly multiplies by the number of networks.
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Complexity of cross-chain bridges. Most of the April hacks are somehow related to protocols that facilitate the movement of assets between blockchains. Bridges remain the most vulnerable link in DeFi.
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Yield chasing. Users ignore warnings, rushing into new protocols with three-digit APY, even if the code was published a week ago and has not been checked by independent auditors.
Key lessons
For users:
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Do not store all assets in one protocol, even if it is considered "whitelisted" by large funds.
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Check not only for audits, but also for bounty programs, as well as the time since the last contract update.
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Consider using insurance aggregators (for example, Nexus Mutual, InsurAce) to protect against smart contract risks.
For teams:
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One audit is not a panacea. Practice shows that even three checks can miss a critical vulnerability.
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Implement multisig with a time delay (timelock) on all administrative functions.
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Bug bounty programs with a serious prize fund (from $1 million) pay off many times over.
What's next?
Regulators have already taken note of the April incidents. It is possible that they will trigger stricter requirements for DeFi protocols - up to mandatory "sandboxes" before mainnet launch.
The market itself, however, demonstrates paradoxical resilience: the total locked value (TVL) has recovered after a short-term drop, and users simply shift liquidity from hacked protocols to those that survived.
The problem of DeFi security does not yet have a technological silver bullet. But April clearly showed: the industry needs not only innovative speed, but also a pause to rethink security standards.
Stay vigilant. DeFi does not forgive mistakes - neither in code, nor in risk management. Safe exchanges in any popular directions on the site Abcobmen