Require service-level KPIs (order accuracy, OTIF, dock-to-stock times), inventory accuracy rates, and transparent reporting cadence. Confirm WMS capabilities (real-time inventory, API/EDI connectivity), SLA for incident response, and support for barcoding/lot tracking to ensure system interoperability and measurable performance.

Assess average transit times to primary delivery zones, density of carrier pickups, and availability of regional carriers and parcel partners. Evaluate cross-dock options, pallet network access, and proximity to arterial routes to optimize cost-to-serve and reduce multi-leg moves for faster last‑mile service.

Prioritize flexible racking, multi-temperature storage, dedicated returns processing lanes, reverse logistics workflows, light assembly/kitting, and quality control stations. Confirm throughput capacity during peak windows and the 3PL’s experience handling multi-channel order profiles and SKU proliferation.

Negotiate transparent unit pricing (pick, pack, storage, handling), minimums, invoicing cadence, and surcharges. Include clauses for seasonal rate caps, performance incentives/penalties tied to KPIs, and clear demarcation of responsibility for inventory loss, duties, and carrier charges to manage total landed cost.

Request operational references, tour facilities to verify capacity and security, review WMS/ERP integration case studies, and validate customs/bonded handling experience. Check their track record with export documentation, HS code management, and contingency plans for capacity spikes or carrier disruptions.