## 1 Introduction  
In the contemporary digital landscape, e-commerce marketplace platforms serve as important intermediaries that facilitate seamless online transactions between buyers and sellers [1]. Designed to streamline transactions and enhance user experience, these platforms integrate various features, such as online storefronts, secure payment systems, and responsive customer support. By catering to participants across different industries, e-commerce marketplace platforms have garnered widespread adoption, supporting transactions ranging from traditional e-commerce to specialized professional services and secondhand markets. This versatility attracts a broad user base, fuels economic activity, and fosters innovation within the platform ecosystem.  
Operating as virtual commerce, e-commerce marketplace platforms such as Amazon and eBay aggregate sellers from diverse backgrounds and locations, thereby offering consumers a wide selection of products and services within a single digital space. User-generated content, including ratings and reviews, plays a crucial role in informing purchasing decisions and building trust among buyers [2]. Flexible business models enable various revenue streams while advanced technological integration enhances user experience and streamlines operations. With their global reach and community-building features,e-commerce marketplace platforms offer convenience, choice, and value to sellers and buyers, thereby shaping the landscape of modern commerce.  
At the core of e-commerce marketplace platforms lies a robust technical infrastructure that facilitates seamless transaction processing, secure payments, and intelligent recommendation algorithms. To remain competitive, these platforms continuously pursue technological advancements, including prioritizing e-service quality (e-SQ) and customer satisfaction (CS) amid rising competition. Recognizing their pivotal role, e-commerce marketplace platforms understand that e-SQ and CS are essential for building e-trust and fostering repeat usage as they influence customer retention, brand reputation, and market differentiation. By focusing on e-SQ and CS, e-commerce marketplace platforms can effectively navigate intense competition, strengthen their market position, and ensure sustained success.  
Exploring the interplay between service quality, CS, trust, and continuous usage intention (CUI) offers valuable insights for platform operators and customers. Several studies have demonstrated that service quality is a crucial factor influencing CS, trust, and CUI, while CS and trust are key predictors of CUI across various fields. For instance, [PERSON] et al. [3] and [PERSON] et al. [4] examined this dynamic through online shopping, [PERSON] et al. [5] focused on websites, [PERSON] et al. [6] explored community group buying platforms, [PERSON] et al. [7] studied business-to-business contexts, and [PERSON] et al. [8] analyzed online services.  
However, applying insights from existing research on the relationships between these factors to e-commerce marketplace platforms presents challenges because of their unique diversity and complexity, which distinguish them from traditional and online platforms [9]. Consequently, addressing these challenges requires new research tailored specifically to the distinct characteristics of e-commerce marketplace platforms.  
To address this gap, this study aimed to examine the structural relationships between e-SQ, CS, e-trust, and CUI, as well as the mediating roles of CS and e-trust. The findings of this study can provide valuable insights for establishing service strategies and policies tailored specifically to e-commerce marketplace platforms.  
The following sections of this paper are organized as follows: First, relevant literature is reviewed to provide a foundation for the study. Next, the research model and hypotheses are presented. Then, an empirical analysis is conducted using the collected data. Finally, the results and implications of the study are discussed.