Confirm WMS and API integrations, SLA commitments (pick/pack/ship times), pick accuracy metrics, throughput capacity, labor flex for peaks, kitting and returns handling, temperature control if required, and availability of cross‑dock or consolidation services.

Location drives linehaul and last‑mile cost: closer proximity to ports, railheads, and high‑density customer zones lowers transit times and carrier spend. Use demand‑weighted inventory placement to reduce two‑day and same‑day shipping costs and to optimize safety stock across nodes.

Negotiate a mix of fixed and variable fees: base storage and handling rates, throughput or per‑unit pricing for peak volumes, clear accessorial rates, labor holiday differentials, and short‑term flex space clauses. Include KPIs and rebate/penalty language for service performance.

Request live demos of WMS dashboards, API documentation, sample reports, and audit logs. Check references and run a paid pilot or test batch to verify inventory accuracy, cycle‑count procedures, and SLA adherence. Consider an on‑site walkthrough or third‑party operational audit.