Developed a configurable Node Selection Strategy Framework for the xmtp/xmtpd gateway payer API, enabling multiple routing strategies such as stable, manual, ordered, random, and latency-aware selection. Leveraging Go and Node.js, the work introduced a latency-based ClosestNodeSelectorAlgorithm to optimize routing efficiency and throughput for payer requests. The implementation included explicit configuration and parameter validation to enhance safety and prevent misconfigurations, while updating service construction with default cache expiry and connection timeout values. This architectural enhancement improved reliability and positioned the gateway for future optimizations, supporting pluggable routing policies and greater configurability in API development and concurrent environments.