Sentiment oracle manipulation on 2023-04-04 ($1.1M reported)
Oracle manipulation on Arbitrum, 4 Apr 2023. Reported loss $1.1M. Last verified 4 Nov 2026.
notable
Reported loss
$1.1M
as reported by the sources
Recovered
$873K
as reported
Status
Partially recovered
updated 26 Oct 2026
Date
Arbitrum
Summary
On 2023-04-04 an attacker manipulated the oracle price of a Balancer LP token to borrow against inflated collateral on the Arbitrum lending protocol Sentiment, leaving about $1,092,191.98 of bad debt; after negotiations the exploiter returned 90% of the funds (465.75 ETH), according to the team's recovery plan.
- Protocol
- Sentiment
- Type
- Oracle manipulation
- Reported loss
- $1,092,192 · as stated: approximately $1,092,191.98 of bad debt source: hackmd.io ↗
- Recovered
- $872,725 · as stated: 465.75 ETH
Facts and where they come from
| Fact | Value | Source |
|---|---|---|
| Date | Apr 4, 2023 | hackmd.io ↗ |
| Cause | manipulated oracle pricing for a Balancer LP token | hackmd.io ↗ |
| Amount (USD) | approximately $1,092,191.98 of bad debt | hackmd.io ↗ |
| Chain | Arbitrum | hackmd.io ↗ |
| Recovered | 90% of the funds, 465.75 ETH | hackmd.io ↗ |
| Recovered (USD) | $872,724.60 | hackmd.io ↗ |
Primary sources
- Sentiment: Sentiment Exploit: Recovery Plan (HackMD) ↗ post-mortem · accessed 2026-11-04
Our own summary of facts published by the sources above. We do not attribute fault beyond them. Amounts are as the sources state them (no USD conversion by us); links and quoted figures last checked 2026-11-04.
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