According to the source, US Bitcoin (BTC) ETFs recorded $163 million in net inflows on Sept 18, while US Ethereum (ETH) ETFs led with $213 million, indicating stronger daily net creations in ETH products versus BTC, source: the provided Twitter post dated Sep 19, 2025. For traders, the positive net creations across BTC and ETH highlight risk-on demand for US-listed crypto ETFs and warrant monitoring for follow-through in subsequent sessions, source: the provided Twitter post dated Sep 19, 2025.