https://predictionfrontier.com/news/polymarket-nex-matching-engine-sandbox Prediction Frontier en 2026-11-15T06:35:32.354Z Polymarket opens NEX matching-engine sandbox https://predictionfrontier.com/news/house-oversight-prediction-market-trading-federal-personnel Prediction Frontier en 2026-11-14T06:56:13.098Z House Oversight staff urge limits on federal workers’ prediction-market trades https://predictionfrontier.com/news/coinbase-ohio-sports-prediction-markets-combos Prediction Frontier en 2026-11-14T06:56:12.098Z Coinbase blocks new Ohio sports prediction trades, including combos