Is Zest Safe?
Risk Grade: C+ (41/100)
Zest is rated as elevated risk — multiple novel mechanisms and notable interaction risks.
A pioneering Bitcoin DeFi protocol with real innovation but elevated risk. The launch-day exploit is a serious red flag for code quality, though the team's swift response and treasury reimbursement show accountability. Stacks and Clarity are less battle-tested than EVM alternatives. High-risk, high-reward for users who believe in Bitcoin-native DeFi and are comfortable with the security track record.
Zest is the largest DeFi lending protocol on Stacks, bringing lending and borrowing capabilities to the Bitcoin ecosystem. You can deposit STX, sBTC, stablecoins, and other assets to earn yield, or borrow against your holdings. Zest is also building BTCz, a yield-bearing Bitcoin restaking product built on Babylon. The protocol has raised $3.5M from Draper Associates and YZi Labs, uses Pyth oracle for pricing, and has an ImmuneFi bug bounty program. However, it was exploited for $897K on its launch day, which the team reimbursed from treasury.
TVL
$63M
Mechanisms
6
Interactions
5
Value Grade
C-
Key Risks for Zest Users
The protocol was exploited on its first day of public launch — while funds were reimbursed, it raises questions about code quality
Built on Stacks using Clarity, a less common smart contract language with fewer security researchers reviewing it
BTCz depends on multiple new technologies (Babylon, sBTC bridge) that have limited production history
Top Risk Factors
- •Zest was exploited on its public launch day for 324,000 STX (~$897K) through a collateral value manipulation attack, demonstrating insufficient pre-launch security testing
- •Built on Stacks using Clarity smart contracts — a less mature and less audited language than Solidity — with a smaller security researcher community to identify bugs
- •The BTCz liquid restaking product introduces novel Bitcoin-native DeFi risks with limited precedent for the Clarity/Stacks architecture
Risk Score Breakdown
Zest's highest risk area is Track Record (8/15). Here's how each dimension contributes to the overall 41/100 score:
Read the Full Zest Risk Report
This protocol has 2 collapse scenarios. 2 high-severity interaction risks identified. See the full mechanism classification, interaction matrix, and deep-dive recommendations.
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