In the digital age, eBay is in an arms race against bot operators who constantly evolve their strategies to exploit APIs and disrupt services. This talk introduces a cutting-edge solution known as "Smart Edge Rate Limiting," a proactive and adaptive framework designed to safeguard mobile ecosystems at the network's edge. Without delving into proprietary specifics, we will explore how dynamic rate limiting based on device reputation can effectively mitigate bot attacks while preserving a seamless user experience. We will also cover how this fits into our multi-layer and pluggable security framework that operates at scale. We will discuss the benefits of implementing security measures at the edge, the challenges overcome, and the positive implications for user trust and platform integrity at large scale.