Prioritize throughput and SLA history, real‑time inventory visibility (WMS/API maturity), cross‑dock and same‑day pick capabilities, labor scalability, and cost per order. Also verify reverse logistics processes, returns handling, and integration with your order management and carrier platforms.

Intermodal connectivity reduces line‑haul rates by enabling competitive routing (rail/truck/sea), while higher carrier density improves freight tender success and lowers small‑parcel rates. Together they shorten transit windows and lower total landed cost through better routing, consolidation, and carrier leverage.

Require minimum WMS functionality, slotting and cycle‑count cadences, uptime SLAs, workforce surge plans, security and compliance certificates, clear KPI definitions (OTD, order accuracy, dwell), and penalties or remediation clauses tied to SLA misses.

Request API documentation and sandbox access, run test EDI/API transactions, review real‑time reporting and exception workflows, audit historical inventory accuracy and return processing KPIs, and validate integration timelines and change management support.