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Case Study: Analyzing Availability Lags Across Fulfillment Centers Using Walmart API Insights

Actowiz Solutions uncovered stock availability delays across Walmart fulfillment centers using real-time API data, improving inventory planning and delivery SLAs.

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Introduction

Fulfillment performance can make or break a sale in the competitive U.S. grocery and e-commerce market. When a product is marked “out of stock” or delayed for delivery, it signals a lag in the fulfillment chain. For nationwide platforms like Walmart, these inconsistencies vary across fulfillment centers and ZIP codes.

Actowiz Solutions was approached by a leading U.S. CPG company to analyze these gaps using real-time data from Walmart APIs to uncover trends, optimize inventory planning, and prevent lost sales.

Objectives

The-Client
  • Monitor SKU availability across Walmart fulfillment centers by ZIP code.
  • Track duration of stockouts and restock intervals.
  • Identify fulfillment centers with recurring availability delays.
  • Provide visual insights to inventory and logistics teams.

Key Challenges

The-Client
  • SKU availability varied not just by region, but by fulfillment warehouse.
  • Stockouts were dynamic, often lasting hours to days.
  • API data had latency windows that required timestamp normalization.

Actowiz Solutions’ Approach

1. Walmart API Integration:
  • Integrated ZIP-based Walmart Inventory API to extract product availability at the nearest fulfillment center.
  • Queried stock status every 2 hours for 180 SKUs across 50 ZIP codes.
2. Fulfillment Zone Mapping:
  • Mapped each ZIP to its assigned Walmart FC (Fulfillment Center).
  • Tracked unique availability patterns per FC, independent of ZIP geography.
3. Out-of-Stock & Restock Duration Tracker:
  • Flagged SKUs as:
    • ✅ In Stock
    • ❌ Out of Stock
    • 🔄 Just Restocked
  • Measured duration of each OOS interval.

Sample Output

SKU ZIP Code FC ID Status OOS Duration Restocked On
Tide Pods 42ct 30301 FC203 ❌ Out of Stock 28 hrs 2025-06-03 16:00 PM
Tropicana 52oz 60601 FC118 ✅ In Stock — —
Oreo 15.35oz 10001 FC031 🔄 Just Restocked 7 hrs 2025-06-03 08:30 AM

Results & Findings

🔹 Identified Top 10 Lagging Fulfillment Centers
  • FC203 and FC031 had repeated 24hr+ stockout cycles.
🔹 17% Inventory Loss Time Reduction
  • After dashboard insights, client improved warehouse allocation.
🔹 Restock Prediction Accuracy: 84%
  • Based on historical intervals, future restocks were projected with high accuracy.
🔹 SKU-Level Fulfillment Alerts Enabled

Dashboard Features Delivered

  • FC-wise SKU Availability Heatmap
  • Restock Interval Timeline
  • OOS Duration Summary Report
  • Alert Generator for High-Lag SKUs

Technology Stack

The-Client
  • APIs: Walmart Inventory API
  • Languages: Python, SQL
  • Databases: PostgreSQL, MongoDB
  • Visualization: Power BI, Looker Studio
  • Automation: AWS Lambda Scheduler

Why Actowiz Solutions?

  • 🌎 Nationwide ZIP-to-FC resolution expertise
  • 🚀 Automated interval tracking engine
  • 🔄 Real-time FC performance benchmarking
  • 📈 Data-driven logistics planning enablement

Client Testimonial

“Actowiz’s fulfillment center insights gave us clarity on where our delays actually happened. Now our warehouse and sales teams work in sync.”

— Director of U.S. Supply Chain Optimization

Next Steps

  • Expand FC tracking to include Target and Amazon
  • Integrate transportation API feeds to track outbound delays
  • Forecast SKU sell-out risk using demand + restock cycles

Conclusion

Availability delays at the fulfillment level are often invisible until they impact sales. Actowiz Solutions empowered this client with real-time, FC-specific stockout tracking and predictive intelligence—leading to smarter inventory allocation, reduced downtime, and improved end-customer experience.