Sei ecosystem-based Filament DEX exploited for $572K

Filament, a decentralized exchange built on the Sei blockchain, has been hit by a major self-liquidation exploit.

According to the platform’s post-hack statement shared on X, attackers took advantage of the platform’s order book system to steal around $572,000.

The Filament DEX exploit occurred between 12:00 AM and 4:00 AM UTC on Apr. 6, during which the attackers used large orders and self-liquidations across several accounts to manipulate prices and withdraw funds. Before the incident, Filament held around $680,000 in user deposits.

1/2 On April 6, 2025 at 12:00 AM UTC, Filament Finance experienced a targeted exploit involving unauthorized fund withdrawals through price manipulation on our order book. The coordinated attack leveraged large order placements and self-liquidation mechanisms across multiple…

— Filament (@FilamentFinance) April 6, 2025

Soon after detecting the breach, Filament paused all trading and withdrawals to stop further losses. They’ve since launched a full investigation, teaming up with law enforcement and blockchain security experts to track the stolen funds.

The attackers moved the funds through the Symbiosis Bridge, then into exchanges, mostly FixedFloat. Wallet addresses and transactions linked to the incident have been shared with authorities and forensic teams to help recover the funds.

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Filament has offered the exploiter a 10% bounty, about $57,000, if they return the rest of the money. The offer is open to negotiation, as long as the attacker cooperates fully.

Filament co-founder, known only as Abhitej, also posted an update on X, saying the team is reviewing logs minute by minute, working with authorities, and preparing a plan to return what’s left to liquidity providers. A full report will be provided soon, along with a process for affected users in the platform’s COMB Pool to reclaim some of their assets.

For last 24 hours, we have been working really hard to:

– Secure the product and go through second by second logs to identify the malicious actors.
– Work with legal authorities and security experts to recover the funds.
– Create a clear plan of action to safely return the… https://t.co/FZU3UzrepC

— Abhitej | Filament (🦹,🦹) (@abhitejxyz) April 7, 2025

This attack adds to what has already been the worst year on record for crypto hacks. According to Immunefi’s Q1 2025 report, $1.64 billion was stolen in the first quarter of 2025 alone. DeFi protocols lost $106.8 million in 38 incidents, while centralized platforms saw just two breaches, but with much larger losses totaling $1.5 billion.

On Mar. 26, Hyperliquid (HYPE) incurred a $10.63 million loss, also as a result of a self-liquidation incident. Oak Security’s managing director Dr. Jan Philipp Fritsche recently warned that many DeFi platforms are at risk of self-liquidation exploits due to predictable failures in trading mechanics.

Read more: Crypto losses reached $1.53B in february, led by Bybit, Infini and zkLend exploits: Certik

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