Kompy

Kompy is the Walmart data API you can actually build on! Stop wrestling with brittle scrapers and messy HTML parsing. Kompy delivers structured, clean, consistent JSON for the entire Walmart marketplace in milliseconds. Whether you are a solo developer hunting for reselling arbitrage, a data analyst tracking price trends, or an AI agent builder needing live product intelligence, Kompy gives you one unified API for products, search, barcode lookup, seller offers, reviews, and full price and stock history. No SDK required, just plain HTTP calls from any language. But here is the real magic: Kompy also ships as a first-class MCP server. That means your AI agents in Claude Code, OpenClaw, Cursor, or any MCP-compatible stack can query Walmart data directly as callable tools. Same API key, same credits, dual access. Kompy records the marketplace around the clock with hourly snapshots and per-seller granularity, giving you the full price history back to day one. Start with free credits, get your API key in 14 seconds, and scale from a side project to production with transparent credit-based pricing. No dark patterns, no forced upgrades, just fast, reliable Walmart data!

REST API with Clean JSON Responses

Every endpoint returns predictable, deterministic JSON shapes with no surprises. Get full product records including price, stock status, seller name, ratings, and review counts in a single request. Responses include a unique request_id for tracing and latency metrics so you always know exactly what happened. No SDK required, just curl, Python, Node, Go, or any HTTP client you prefer. Structured errors and small payloads keep your integrations fast and reliable.

MCP Server for AI Agents

Point your AI agent at Kompy's MCP server and it instantly gains the ability to query Walmart data as callable tools. Your agent can search the live catalog, fetch full product records, pull price history, and retrieve customer reviews all through natural language commands. Works seamlessly with Claude Code, OpenClaw, Cursor, LangChain, OpenAI Agents SDK, n8n, and any MCP-compatible stack. One API key powers both REST and MCP access.

Full Price and Stock History

Kompy records the Walmart marketplace around the clock with hourly snapshots. Every price change, stock update, and buy-box shift gets captured with per-seller granularity. Access the complete history for any SKU back to day one. See exactly when prices dropped, how long deals lasted, and which sellers dominated the buy box. This is historical data no other Walmart API provides, and it is invaluable for spotting trends and timing your purchases.

Barcode Lookup and Seller Offers

Scan any barcode and instantly retrieve the matching Walmart product with full details. No more manual searching or UPC database lookups. Additionally, get detailed seller offers including price, stock status, and seller name for any product. This is perfect for comparing multiple sellers, finding the best deal, or identifying which third-party sellers are competing on a given item. All data returns as clean, consistent JSON.

Reselling Arbitrage and Flipping

Scan Walmart clearance items and identify products you can resell on Amazon or eBay for a profit. Use the search endpoint with price drop sorting to find deeply discounted items, then check their Amazon prices via the product endpoint. Kompy's history endpoint shows you the price trajectory so you know if the discount is real. One user found a Samsung 65-inch 4K TV at Walmart for $447.99 that sells for $612 on Amazon, yielding a 34% ROI after fees. Set up hourly monitoring and get pinged when new flips clear your profit bar!

Competitive Price Monitoring

Track competitor pricing on Walmart in real time. Use the product endpoint to fetch current prices and stock status for any SKU. Set up automated checks via the REST API to monitor price drops or stock changes. The history endpoint lets you analyze pricing patterns over weeks or months, so you know when competitors typically discount. Perfect for ecommerce brands, retail analysts, and pricing strategists who need to stay ahead of market movements.

AI Agent Powered Market Research

Equip your AI agents with live Walmart data for automated market research. An agent can search for products in a category, analyze price distributions, identify top-rated items, and generate reports without any manual data entry. Use the MCP server to let your agent call Kompy's tools directly. Build agents that monitor specific products, alert you to price changes, or even execute trades based on your criteria. The deterministic schemas make integration clean and reliable.

Inventory and Stock Alerts

Never miss a restock or a stockout again. Use the product endpoint to check stock status for any item on Walmart. Set up recurring API calls to monitor high-demand products like gaming consoles, popular toys, or limited edition items. When stock flips from false to true, trigger your own alerts via webhooks or email. The hourly snapshot data in the history endpoint also lets you analyze stock patterns over time, helping you predict when items are most likely to be available.

Start small and scale when you are ready. All plans include API access, MCP server access, and email support. No hidden fees, just transparent credit-based pricing.

Hobby $49.99 per month: For individuals getting started. Includes 14,000 credits per month and email support.

Pro $149.99 per month: For professionals and small teams. Includes 45,000 credits per month and priority support.

Business $499.99 per month: For large teams with custom needs. Includes 180,000 credits per month, priority support, and custom integrations.

Every account starts with free credits so you can test the API immediately. Get your API key in about 14 seconds and start issuing real requests today! No forced upgrade, no dark patterns, just the same fast API at every tier.

Do I need to run any scrapers or maintain any infrastructure?

Absolutely not! Kompy handles all the data collection and parsing on its end. You just make simple HTTP requests or connect via MCP. No headless browsers, no proxy management, no HTML parsing nightmares. Kompy returns clean, structured JSON every time, so you can focus on building your application instead of fighting with Walmart's website.

Can I use the same API key for both REST and MCP access?

Yes! One API key works for both the REST API and the MCP server. The same credits are consumed regardless of which access method you use. This means you can build a traditional web application with the REST API and also connect your AI agents via MCP, all under a single account and billing plan.

How does the credit system work?

Every API request consumes a certain number of credits based on the endpoint complexity. Simple product lookups cost fewer credits than full history queries. You start with free credits when you sign up, and you can purchase credit packs or subscribe to a monthly plan. Credits roll over month to month on annual plans. There are no hidden fees, no surprise charges, and no forced upgrades. You only pay for what you use.

What marketplaces does Kompy support right now?

Currently, Kompy provides comprehensive data for the entire Walmart marketplace including products, search, barcode lookup, seller offers, reviews, and full price and stock history. The team is actively building support for more major ecommerce marketplaces, and those will be announced on the blog and changelog. Sign up now to lock in early adopter pricing for future marketplaces!