Key KPIs include order cycle time, on‑time shipping rate, pick accuracy, inventory accuracy and receiving lead time. SLAs should specify cut‑off times, chargebacks for missed SLAs, inventory reconciliation cadence and penalties for pick/pack errors. Also require transparent reporting and EDI/WMS integration to monitor performance in real time.

Assess the 3PL’s carrier roster, negotiated rates, and frequency of regional departures. Review linehaul lanes to target markets, transit time matrices, and options for expedited and deferred services. Confirm relationships with local last‑mile networks and track record for delivery density in your customer geographies.

Prioritize facilities with ample dock doors, high‑bay racking, flexible staging areas, and multi‑temperature zones for mixed inventory. Onsite cross‑dock capability and scalable labor pools reduce dwell time and peak surge costs. Verify WMS functionality for slotting optimization, automated replenishment and labor management to control unit costs as volumes change.

Confirm the 3PL provides customs brokerage support or trusted partner referrals, accurate HS code handling, bonded storage if needed, and experience with export documentation. Ask for records of past cross‑border shipments, tariff classification accuracy, and processes for inspections to avoid clearance delays and unexpected duties.