US spot Bitcoin exchange-traded funds extended their net inflow streak to nine consecutive trading days on Tuesday, attracting $66.2 million in a single session and pushing cumulative inflows over the run to roughly $3.1 billion, according to data from SoSoValue.

The nine-day stretch brings year-to-date net inflows for the Bitcoin ETF complex to approximately $1 billion. The figure marks a sustained reversal of the outflow pressure that weighed on the products earlier in the year and signals re-engagement from allocators after weeks of uneven demand.

The picture for altcoin funds turned markedly weaker. Spot Ether ETFs ended a seven-day inflow streak on Tuesday, posting roughly $3 million in net outflows. The drawdown is modest in nominal terms but interrupts a run during which the funds attracted more than $851 million across seven sessions. Cumulative net inflows into spot Ether ETFs since launch stand at approximately $14 billion, meaning the Tuesday outflow represents a fractional reversal rather than a structural shift in positioning.

Zcash ETFs saw a sharper turn. The funds snapped a six-day inflow streak on Monday after recording $8 million in net outflows, according to SoSoValue data. The redemption is more consequential for the smaller Zcash products, where liquidity is thinner and single-day flows carry proportionally greater weight than in the Bitcoin or Ether complexes.

The divergence between Bitcoin products and altcoin funds comes as broader risk appetite shows early signs of fatigue. Alternative.me's Crypto Fear & Greed Index slipped to 71 from 73 a day earlier, remaining in "Greed" territory but off recent highs. Bitcoin itself traded near $83,567 at the time of publication, down 0.4% over 24 hours, according to CoinGecko data.

Kyle Rodda, senior financial market analyst at Capital.com, attributed the pause in Bitcoin's momentum to macro pressure rather than crypto-specific dynamics. "The rise in crude prices is capping non-yielding assets, so Bitcoin's rally has taken a bit of a pause," Rodda told Cointelegraph. He added that Bitcoin could struggle to regain upward momentum while energy-price risks persist, though he described the technical picture as remaining "quite constructive."

The flow data underscores an operational reality for ETF issuers: sustained Bitcoin inflows at roughly $3.1 billion over nine sessions have consolidated the asset's dominance within the US spot crypto ETF market, while Ether products — despite their $14 billion cumulative base — remain more sensitive to short-term sentiment shifts. For issuers such as BlackRock, Fidelity, Grayscale and Bitwise, the nine-day Bitcoin streak supports fee-generation on assets under management, whereas the Ether outflow, however small, tests the durability of the prior week's $851 million accumulation.

The Zcash outflow adds a further layer of caution. Six days of inflows into the privacy-coin products had suggested a niche but persistent bid; Monday's $8 million reversal indicates that demand remains fragile and highly responsive to market-wide sentiment.

Whether the Bitcoin streak reaches a tenth session will depend on how allocators weigh rising crude prices and their drag on non-yielding assets against the constructive technical setup Rodda cites. A sustained turn in energy markets, or a breakout above recent resistance, would likely determine whether the $3.1 billion run extends or whether the altcoin outflows presage a broader cooling across the US spot crypto ETF complex in the sessions ahead.