Sonne Finance
Last changed 2026-10-27 · Score recalculated — Rescored under Scoring v2, the published formula (avoid.net/scoring): 52 → 56. Problems weighed by who is responsible: incidents the subject suffered −6.4, concerns that are not fraud −3.2, problems around the subject, caused by others −1.6; legitimacy credit long-running +2; fact-check adjustments (+42) now shown as page reliability, not in the score. Version history →
Why this score
| Every page starts at | 65 |
| Concerns that are not fraud | -3.2 |
| Incidents it suffered (e.g. hacks) | -6.4 |
| Problems around it, caused by others | -1.6 |
| Long-running | +2 |
| Sum | 56 |
Score: 56/100 (kept between 0 and 100)
How scoring works →Summary
Sonne Finance is a Compound V2 fork deployed on Optimism that was exploited for approximately $20 million on May 14, 2024, in what became the largest exploit in Optimism's history. The attack exploited a well-known precision-loss donation vulnerability in Compound V2 forks, triggered during the rollout of a new VELO token market; the attacker leveraged a multi-transaction deployment architecture and a two-day timelock window to manipulate exchange rates and drain user funds.
Connected Entities
5 entities · 60 linked investigations- Hundred Finance→mentioned with→Optimism(80%)
- Hundred Finance→mentioned with→Ethereum(70%)
- Compound V2→mentioned with→Ethereum(80%)
- Optimism→mentioned with→Ethereum(80%)
- Compound V2→mentioned with→Sonne Finance(80%)
- Hundred Finance→mentioned with→Compound V2(80%)
- Sonne Finance→mentioned with→Compound V2(80%)
- Sonne Finance→mentioned with→Hundred Finance(80%)
- Sonne Finance→mentioned with→Optimism(80%)
- Sonne Finance→mentioned with→Ethereum(75%)
Timeline(8 events)
September 2022
Sonne Finance launches on Optimism as a Compound V2 fork.
15 April 2023
Hundred Finance exploited via precision-loss donation attack on Compound V2 fork — the same vulnerability class later used against Sonne Finance.
4 May 2024
Sonne Improvement Proposal 15 introduced to add VELO token market to the Optimism deployment.
7 May 2024
SIP-15 passes unanimously with 2.3 million SONNE votes. Team queues multi-transaction market deployment on multisig with two-day timelock.
12 May 2024
Attacker executes preparatory transaction positioning for exploit once timelock expires.
14 May 2024
Timelock expires. Attacker executes donation attack against soVELO market, draining approximately $20 million across VELO, WETH, USDC.e, WBTC, wstETH, USDT, and USDC. SEAL contributor intervenes and preserves approximately $6.5 million in remaining funds.
15 May 2024
Sonne Finance pauses all Optimism markets. Team announces exploit publicly, offers 10% bounty to attacker for fund return. SONNE token drops over 60%.
26 May 2024
Attacker transfers 1,600 ETH (approximately $6.2 million) to Tornado Cash.
Decision Log
- slot 461962959 · hash 4rh5Kr5nGs8MkfrEYKaGuFt2mdyA8jzzS9jkahVBTGni
- slot 459487905 · hash 8CBGxUn8RFFHtLva2x7Ngv3uh3vcFCWTiP1zbYRZBFkc
- slot 426700991 · hash C55ikLT611TjEZrexo6gneaYvi4qMcFjhNePA4Mz8KBN
- slot 426700987 · hash aYaV8GdStZCKjodmf3s8epKgnQZJkKzBi2fbWa34eNa
- slot 421012576 · hash 8bxEaCMMfmeQEqt4czyNNYDmVBtcWBmDddhr7yvzDkP4
This investigation is cryptographically anchored to the Solana blockchain (5 decisions). 11 of 15 cited source URLs have an Internet Archive snapshot.
model: claude-sonnet-4-6
generated: 5/4/2026, 2:54:32 AM
last updated: 10/27/2026, 6:03:24 AM
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