6 papers
SAiFE-gym: Model-based Environments for Automated Market Making with Concentrated Liquidity
Georgios Chionas, Charalampos Kleitsikas, Stefanos Leonardos +2
We present SAiFE_gym, a Python module that provides a collection of simulation environments for studying trading problems in Constant Product Markets (CPMs) with Concentrated Liqui…
Concentrated Liquidity Provision: a Reinforcement Learning Perspective
Georgios Chionas, Charalampos Kleitsikas, Stefanos Leonardos +2
Automated market makers (AMMs) are a cornerstone of decentralised finance (DeFi). Constant product markets with concentrated liquidity, such as UniswapV3, are now a well-establishe…
Position Auctions with a Capacity Constraint
Eleni Batziou, Georgios Birmpas, Georgios Chionas +1
Sponsored search auctions are commonly modeled as an assignment of a fixed set of positions to a set of advertisers, with welfare maximization reducible to a standard matching prob…
A Tractability Boundary for Exclusion Zones in Instant-Runoff Voting: Planar Versus One-Apex Graphs
Georgios Birmpas, Georgios Chionas, Efthyvoulos Drousiotis +3
We study exclusion zones for instant-runoff voting (IRV) on connected, unweighted graphs. Each vertex hosts one voter and may host a candidate. Voters rank candidates by shortest-p…
Selling Privacy in Blockchain Transactions
Georgios Chionas, Olga Gorelkina, Piotr Krysta +1
We study methods to enhance statistical privacy in blockchain transactions. We analyze economic mechanisms for privacy-aware transaction owners whose utility depends not only on th…
MEV Sharing with Dynamic Extraction Rates
Pedro Braga, Georgios Chionas, Piotr Krysta +3
Maximal Extractable Value (MEV) has emerged as a new frontier in the design of blockchain systems. In this paper, we propose making the MEV extraction rate as part of the protocol…