Open interest for S&P 500 index contracts on Trade.xyz has surged by over 40% in just two days, reaching $407 million from a low of $281 million on April 14. This marks the platform's largest open interest position amid a rally in U.S. stocks. In contrast, open interest for WTI and Brent crude contracts has sharply declined, with WTI dropping from $845 million to $389 million and Brent from $352 million to $274 million, reflecting decreased volatility in oil trading instruments during U.S.-Iran negotiations.