Blockchain aggregators play an instrumental role in the evolution of blockchain technology, serving as pivotal enablers of interoperability, efficiency, and user accessibility in an increasingly decentralized digital world. However, the literature on this emerging technology is scarce and not systematized, making it harder for practitioners and researchers to understand the field. In this paper, we systematize blockchain aggregators, with a specific emphasis on bridge aggregators. We present an exhaustive analysis of a diverse array of token and message aggregators, each distinguished by its unique architecture. Our investigation delves into critical aspects of these aggregators, encompassing their functionality, security measures, pricing models, and latency characteristics. The objective of this research is to furnish readers-encompassing both users and developers-with insightful and actionable information, thereby facilitating informed navigation through the complex landscape of blockchain aggregators.

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