arXiv subjects

Anastasiia Zbandut

Publications and source records attributed to Anastasiia Zbandut.

3 recordsLinked to original sources

arXiv2026

Vault as a credit instrument

We derive five tractable credit risk metrics for DeFi lending vault depositors, grounded in a formal three level decomposition of vault risk into mechanical loss channels (Level 1), governance quality (Level 2) and smart contract code integrity (Level 3). For Level 1, we show that six structural features of onchain execution (oracle execution divergence, endogenous recovery, full information run dynamics, timelock constrained governance, oracle manipulation and congestion driven liquidation failure) break canonical TradFi analogies and generate depositor loss channels absent from standard credit frameworks. Vault credit risk metrics translate these channels into measurable risk components which are aggregated into a vault credit score. The empirical contribution is an implementable estimation architecture for credit risk metrics, including required onchain data, identification strategies for core parameters, partial identification bounds and a coherent stress scenario methodology. The results have direct implications for vault risk management and for minimum transparency standards necessary for depositor risk assessment.

q-fin.RM↗

arXiv2025

Pricing of wrapped Bitcoin and Ethereum on-chain options

This paper measures price differences between Hegic option quotes on Arbitrum and a model-based benchmark built on Black--Scholes model with regime-sensitive volatility estimated via a two-regime MS-AR-(GJR)-GARCH model. Using option-level feasible GLS, we find benchmark prices exceed Hegic quotes on average, especially for call options. The price spread rises with order size, strike, maturity, and estimated volatility, and falls with trading volume. By underlying, wrapped Bitcoin options show larger and more persistent spreads, while Ethereum options are closer to the benchmark. The framework offers a data-driven analysis for monitoring and calibrating on-chain option pricing logic.

q-fin.PR↗

arXiv2025

Institutionalizing risk curation in decentralized credit

This paper maps the emerging market for decentralized credit in which ERC 4626 vaults and third-party curators, rather than monolithic lending protocols alone, increasingly determine underwriting and leverage decisions. We show that modular vaults differ in capital utilization, cross-chain and cross asset concentration, and liquidity risk structure. Further, we show that a small set of curators intermediates a disproportionate share of system TVL, exhibits clustered tail co movement, and captures markedly different fee margins despite broadly similar collateral composition. These findings indicate that the main locus of risk in DeFi lending has migrated upward from base protocols, where underwriting is effectively centralized in a single DAO governed parameter set, to a permissionless curator layer in which competing vault managers decide which assets and loans are originated. We argue that this shift requires a corresponding upgrade in transparency standards and outline a simple set of onchain disclosures that would allow users and DAOs to evaluate curator strategies on a comparable, money market style basis.

q-fin.RM↗