Bitcoin traded around $78,545 after a brief rejection above $81,000, leaving $80,000 as near-term resistance and $76,200–$77,000 as the key September support while markets price roughly a 60% chance of a Fed rate hike. On-chain and market signals show Binance reserves rising to about 687,000 BTC (a 2026 high) as exchange stablecoin balances dropped from roughly $80B to $64B, and US spot Bitcoin ETF flows cooled to $924.5M for the week ending Aug. 28 (down 51.8% from ~$1.92B) with a $201.8M outflow on Aug. 28, raising crypto liquidity and supply risks for price and adoption.

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Bitcoin is entering September with a very different setup from the one that powered its 24% August rally.

BTC was trading around $78,545 on Aug. 31, after briefly climbing above $81,000 before failing to hold the psychologically important $80,000 level. The retreat comes as several of the forces supporting August’s rebound: spot ETF demand, available exchange supply and spot-market buying begin flashing less favorable signals.

At the same time, macro conditions have become less supportive. Markets are now pricing roughly a 60% probability of a Federal Reserve rate increase in September following Chair Kevin Warsh’s hawkish Jackson Hole comments, adding another obstacle for risk assets.

One of the clearest on-chain warnings is appearing at Binance.

Bitcoin reserves held on the exchange have climbed to approximately 687,000 BTC, their highest level of 2026, according to CryptoQuant. The balance had fallen toward 617,000 BTC in late April before reversing higher, with the increase accelerating as Bitcoin rallied through August.

Higher exchange reserves do not automatically mean those coins will be sold. Transfers can reflect custody movements, collateral or market-making activity.

They nevertheless increase the amount of Bitcoin immediately available to trade, creating a potential supply overhang just as BTC is struggling with resistance around $80,000.

That matters more because exchange stablecoin reserves have simultaneously fallen from roughly $80 billion to around $64 billion, leaving less idle crypto liquidity available to absorb additional supply.

Coinpaper previously examined how Bitcoin can move into a higher-risk market regime when institutional demand and broader liquidity weaken simultaneously.

Bitcoin ETF Demand Is Strong — but No Longer Accelerating

Institutional demand has not disappeared.

U.S. spot Bitcoin ETFs still attracted approximately $924.5 million during the week ending Aug. 28. But that was down 51.8% from the previous week’s roughly $1.92 billion inflow. The funds also recorded a $201.8 million net outflow on Aug. 28, ending a nine-session inflow streak.

The distinction is important. A single outflow session does not establish a new trend, especially after almost $1 billion entered the products during the week.

Spot ETFs remain one of Bitcoin’s most important institutional demand channels; Coinpaper’s Bitcoin ETF flows explainer shows why persistent creations can translate into additional underlying BTC demand.

The latest cooling follows a sharp reversal from earlier in the summer, when ETF inflows were already beginning to strengthen even while Bitcoin traded below $64,000.

[TABLE — PLACE HERE: Bitcoin warning indicators — Binance reserves, ETF flows, spot demand and Fed expectations]

$77K Support Becomes the September Line to Watch

Market structure provides the immediate test.

Bitcoin’s Aug. 28 rejection above $81,000 has restored $80,000 as resistance, while the $76,200–$77,000 region is emerging as nearby support. A sustained break below that area could expose the mid-$75,000s, while reclaiming $80,000 would put the $81,000–$83,000 zone back in focus.

Spot cumulative volume delta has also remained relatively flat during parts of the rebound, suggesting leveraged trading may be contributing more to the move than aggressive spot buying.

September seasonality adds another reason for caution, although it is far from deterministic. Bitcoin has historically averaged a roughly 3.1% September decline since 2013, yet each of the past three Septembers finished positive.

The more immediate issue is therefore not the calendar itself. Bitcoin enters September needing ETF and spot buyers to absorb elevated exchange supply while simultaneously navigating a more hawkish Fed backdrop.

That makes $77,000 below and $80,000 above the clearest near-term battlefield.

Coinpaper’s earlier coverage of the Fed and Bitcoin showed how quickly changing rate expectations can spill into crypto prices.

Read the article at Coinpaper