Request clear KPIs: order accuracy, on-time dispatch, dock-to-stock lead time, inventory accuracy, average pick-pack cycle time, return processing time and SLA penalties. Also evaluate reporting cadence and sample audit procedures to validate metrics during the onboarding trial period.

Compare accessible transit radiuses, parcel hub proximity, LTL and regional carrier partnerships, and intermodal links. Assess typical transit times to priority ZIPs, frequency of regional departures, and the 3PL's ability to negotiate carrier rates and manage zone-skipping for cost optimization.

Prioritize pick-and-pack accuracy, multi-SKU kitting, returns management, B2B pallet handling, cold storage if needed, fulfillment cut-off times for same-day/next-day, inventory slotting strategies, and seamless WMS/API integrations to keep omnichannel order flows synchronized.

Negotiate transparent line-item rates for receiving, storage (by tier), pick/pack, monthly minimums, accessorials, fuel and outbound freight handling. Secure performance-based SLAs, defined review periods for rate adjustments, volume-tier pricing, and reasonable exit or short-notice clauses to maintain flexibility.