Prioritize measurable KPIs and infrastructure: transit times to core markets, carrier density and frequency, dock capacity, IT integrations (WMS/OMS/APIs), SLA history, labor stability, and scalability for peak seasons. Request cycle time data, chargeback history, and a sample onboarding timeline.

Compare line‑item costs: inbound freight, duties/customs handling, storage per pallet or SKU, pick/pack labor, outbound parcel or LTL rates, and expected dwell. Model scenarios for inventory turns, safety stock needs, and last‑mile delivery zones to quantify net landed cost.

Look for multi‑channel picking, real‑time inventory visibility, lot and serial tracking, reverse logistics capacity, temperature control if needed, and fast integration with marketplaces and carrier systems. Documented accuracy and on‑time metrics are essential.

Conduct site visits, audit safety and security protocols, verify insurance and certifications, review references and SLA penalties, test EDI/API connections, and validate contingency plans for labor outages, equipment failures, and customs delays. Ensure contractual clarity on liability and KPIs.