A developer has significantly reduced API costs for a web app linking Polymarket price movements with real-time news by optimizing code to avoid redundant API calls. Initially, the app re-fetched and re-analyzed the same articles, leading to excessive token consumption on OpenAI and the news API. By modifying the code to fetch only new articles within the last five minutes, the developer achieved a 50x reduction in API usage. This optimization reduced OpenAI costs from approximately $10 per day to $0.5 per day, while maintaining the same monthly cost for the news API but with improved real-time data fetching.