Demo

A REST API built in C++ that provides real-time CS2 skin market data from the Steam Marketplace, including a budget optimization engine powered by a knapsack algorithm.

Features

• Skin Search — Search CS2 skins by name with live Steam Market data
• Price Lookup — Get current market prices for any skin
• Budget Optimizer — Given a budget, finds the best combination of skins to buy using a knapsack algorithm

Tech Stack

• C++17
• Crow — C++ HTTP framework
• libcurl — HTTP requests to Steam Market API
• nlohmann/json — JSON parsing
• CMake — Build system

Endpoints

GET /health

Returns server status.

GET /search?q={query}

Search for CS2 skins by name.

Example:

GET /search?q=AK-47+Redline

Response:

{
  "total_count": 8,
  "results": [
    {
      "name": "AK-47 | Redline (Field-Tested)",
      "sell_listings": 803,
      "sell_price": 4823,
      "sell_price_text": "$48.23"
    }
  ]
}

GET /price?name={market_hash_name}

Get price overview for a specific skin.

POST /budget/optimize

Find the best combination of skins within a given budget using a knapsack algorithm.

Request Body:

{
  "budget": 100.00,
  "query": "AK-47 Redline"
}

Response:

{
  "budget": 100.00,
  "total_spent": 88.17,
  "remaining": 11.83,
  "skins": [
    { "name": "AK-47 | Redline (Field-Tested)", "price": "$48.23", "listings": 803 },
    { "name": "AK-47 | Redline (Battle-Scarred)", "price": "$39.94", "listings": 64 }
  ]
}

Building

Prerequisites

• CMake 3.20+
• GCC (via MSYS2 on Windows)
• libcurl
• nlohmann/json

Build Steps

mkdir build
cd build
cmake .. -G "MinGW Makefiles"
cmake --build .
.\cs-skin-api.exe

Server runs on http://localhost:8080