Bitcoin ETFs recorded a $186M net inflow on April 15, with BlackRock’s IBIT accounting for $292M of that total. The Polymarket contract for Bitcoin’s price on April 15 sits at 100.0% YES.

Market reaction

The inflow pushed confidence in Bitcoin hitting between $78,000 and $80,000 by April 15. The largest single move was a 31-point spike at 3:31 PM, with odds climbing from 48% to 78%. The Bitcoin market traded $334,856 in face value over 24 hours.

Ethereum ETFs saw a $67.8M inflow on the same day. The Ethereum market for April 16 is at 0.7% YES, while the April 17 contract is at 99.9% YES. The gap between those two numbers suggests traders expect Ethereum to land outside the $2,600–$2,700 band on April 16 but return to it by April 17.

Why it matters

The size of these ETF inflows, particularly BlackRock’s $292M into IBIT, points to institutional buying rather than retail activity. $334,856 in 24-hour volume on the Bitcoin prediction contract confirms that Polymarket traders are pricing in these flows quickly.

What to watch

At 0.7% YES for April 16, the Ethereum contract is a long-shot bet: buying YES at 1¢ would pay 100x if Ethereum lands in that range. Bitcoin at 100% YES leaves no upside on the current contract.

U.S.-Iran tensions could shift ETF inflow patterns. BlackRock and Fidelity’s next ETF reports will show whether institutional buying continues at this pace.

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