1 citations · 1 across the 12 of their papers we have counts for
14 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…
NFT-Based Reward Mechanisms: Sybil Farming, Vesting, and Stochastic Verification
Marco Alberto Javarone, Stefanos Leonardos, Carmine Ventre
We study NFT-based reward mechanisms in which a user can create multiple identities and submit fraudulent claims that mature a reward subject to vesting. We assume that the issuer…
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…
The Price of Decentralization in Block Building
Burak Öz, Fei Wu, Luis Correia +3
Decentralized block building mechanisms replace the monopoly of a single proposer with multiple builders. However, their censorship-resistance and fair-access benefits depend not o…
Performative Market Making
Charalampos Kleitsikas, Stefanos Leonardos, Carmine Ventre
Financial models do not merely analyse markets, but actively shape them. This effect, known as performativity, describes how financial theories and the subsequent actions based on…
Bitcoin's Edge: Embedded Sentiment in Blockchain Transactional Data
Charalampos Kleitsikas, Nikolaos Korfiatis, Stefanos Leonardos +1
Cryptocurrency blockchains, beyond their primary role as distributed payment systems, are increasingly used to store and share arbitrary content, such as text messages and files. A…
Asymptotic Extinction in Large Coordination Games
Desmond Chan, Bart De Keijzer, Tobias Galla +2
We study the exploration-exploitation trade-off for large multiplayer coordination games where players strategise via Q-Learning, a common learning framework in multi-agent reinfor…
From Competition to Centralization: The Oligopoly in Ethereum Block Building Auctions
Fei Wu, Thomas Thiery, Stefanos Leonardos +1
Block production on the Ethereum blockchain has adopted an auction-based mechanism known as Proposer--Builder Separation (PBS), where validators outsource block creation to builder…
AdChain: Decentralized Header Bidding
Behkish Nassirzadeh, Albert Heinle, Stefanos Leonardos +2
Due to the involvement of multiple intermediaries without trusted parties, lack of proper regulations, and a complicated supply chain, ad impression discrepancy affects online adve…
CountChain: A Decentralized Oracle Network for Counting Systems
Behkish Nassirzadeh, Stefanos Leonardos, Albert Heinle +2
Blockchain integration in industries like online advertising is hindered by its connectivity limitations to off-chain data. These industries heavily rely on precise counting system…
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…
Strategic Bidding Wars in On-chain Auctions
Fei Wu, Thomas Thiery, Stefanos Leonardos +1
The Ethereum block-building process has changed significantly since the emergence of Proposer-Builder Separation. Validators access blocks through a marketplace, where block builde…
AlberDICE: Addressing Out-Of-Distribution Joint Actions in Offline Multi-Agent RL via Alternating Stationary Distribution Correction Estimation
Daiki E. Matsunaga, Jongmin Lee, Jaeseok Yoon +3
One of the main challenges in offline Reinforcement Learning (RL) is the distribution shift that arises from the learned policy deviating from the data collection policy. This is o…
Coalitions & Voting Power in the Greek Parliament of 2012: A Case-Study
Constandina Koki, Stefanos Leonardos
We revisit the May and June 2012 Greek Parliamentary elections and the December 2014 Presidential election that was held by the June-elected Parliament. The three voting instances…