Request KPIs that align to your SLAs: order accuracy (%), on-time shipment rate, average pick-and-pack throughput, dock-to-stock and put-away times, inventory accuracy, and returns processing time. Also require visibility metrics such as WMS integration uptime and EDI/API message latency to ensure operational transparency.

Proximity to ports and FTZ/bonded capacity reduces handling steps and import duties, shortening lead times and lowering landed cost. Evaluate port interchange times, customs clearance performance, and whether the 3PL offers in-house bonded processes to minimize delays and maintain predictable SLAs.

Prioritize WMS with real-time inventory, ecommerce connector support, scalable pick strategies (batch, wave), label and returns processing, and cold-chain if needed. Confirm carrier integrations for rate shopping, parcel manifesting, and visibility APIs to support omnichannel order routing and same-day or next-day promises.

Model total landed cost vs. service level: a single regional hub lowers fixed costs and inventory complexity but increases last-mile time and cost for distant customers. Multiple local sites improve delivery speed and customer experience at higher inventory carrying and operational expense. Use density, order profiles, and delivery SLA targets to quantify the break-even.