Bitcoin (BTC) traded near $76,500 on September 17, 2026, days after Glassnode flagged the Short-Term Holder cost basis at $71,300 as thinning support, with $62,000 to $65,000 the next zone. Corporate treasury buying has slowed to about 5,900 BTC over three months, versus 89,000 BTC in July 2025 alone, while Ether (ETH) ETFs also posted outflows.
Why is Bitcoin's on-chain support thinning after the Fed hike?
The picture comes from Glassnode's weekly on-chain report, published September 16, 2026 under the title "Breakdown into Thin Support," and lands two days after the Senate's CLARITY Act cloture vote failed 49 to 50 on September 15 and one day after the Federal Reserve raised its target range to 3.75% to 4.00% on September 16, its first hike since 2023.
| Date | What happened | Market effect |
|---|---|---|
| Sep 14, 2026 | Realized Cap streak ends at 27 days | BTC near $76.7K mean |
| Sep 15, 2026 | CLARITY Act cloture fails, 49-50 | BTC ETFs: -$450.4M |
| Sep 16, 2026 | Fed hikes to 3.75%-4.00%, first since 2023 | BTC ETFs: -$295.9M |
| Sep 16, 2026 | Glassnode flags $71.3K as thin support | ETH ETFs: -$224.1M |
Farside Investors data show US spot Bitcoin ETFs lost $450.4 million on September 15 and $295.9 million on September 16, a combined $746.3 million that crypto-economy.com independently confirmed while citing the same Glassnode report. Ether ETF flows on Farside show a further $142.3 million out on September 15 and $224.1 million on September 16.
Glassnode's report says Bitcoin's Realized Cap, the value of every coin priced at where it last moved, rose for 27 straight days through September 14 before turning negative on September 15 and 16, a sign that new capital stopped arriving at the pace it had been. The same report puts the Short-Term Holder cost basis, the average price paid by recent buyers, at $71,300, and names $62,000 to $65,000 as the next demand zone beneath it. Stablecoin market capitalization sits near $301 billion, flat on the week and about 4% below its April 2026 peak, with 30-day growth below the pace Glassnode treats as supportive of new buying. Corporate treasuries, meanwhile, added roughly 5,900 BTC over the past three months, a fraction of the 89,000 BTC they bought in July 2025 alone, per the same report. One steadier signal: exchange balances kept falling, which Glassnode reads as coins continuing to leave exchanges rather than gathering there to be sold.
Where analysts disagree
The dip below $76,000 gets bought. Mark Sishka, global head of OTC trading at Blockchain.com, told Benzinga on September 11 that a pullback toward $70,000 to $72,000 would likely "get bought on the dip" and set up a run at $82,000 to $85,000, arguing sentiment has shifted from selling rallies to buying weakness even though a cycle low under $60,000 remains theoretically possible.
A hawkish Fed still threatens the 2026 low. Stephen Wundke, strategy and revenue director at Algoz, told Decrypt on September 16 that hawkish remarks from the Fed could send Bitcoin back to retest its $63,000 low for 2026, calling the CLARITY Act failure "disappointing" but not the market's main driver. HashKey senior researcher Tim Sun, in the same article, argued the real signal to watch is dollar liquidity finding a bottom, not the CLARITY Act's fate.
Wundke's $63,000 retest risk sits inside the $62,000 to $65,000 zone Glassnode's data points to, while Sishka's $70,000 to $72,000 buy zone sits just above the $71,300 cost basis Glassnode calls thin. Both camps are watching close to the same levels; they disagree on whether that support holds on the first test.
Why it matters
Short-Term Holder cost basis has marked past floors because it is the price at which the most recent, most reactive buyers break even, and selling usually slows once price nears it. Glassnode's report says that floor is now thin because the two forces that would normally defend it, corporate treasury buying and new stablecoin capital, have both stalled at the same time the Realized Cap uptrend broke. That combination does not by itself mean lower prices; it means fewer buyers are positioned to absorb a leveraged flush if one arrives, which raises the odds that a test of $71,300 either holds narrowly or air-pockets toward $62,000 to $65,000 rather than stabilizing gradually. Falling exchange balances argue the other way: coins are not massing on exchanges for an ordinary sell-off, which is one reason Glassnode's own tone reads as strained rather than broken.
What to watch
Whether BTC holds $71,300 on the next retest, or trades through it toward the $62,000 to $65,000 zone Glassnode names. The next Farside daily ETF prints for signs the September 15 to 16 outflows were a two-day reaction to the Fed and CLARITY Act news rather than a new trend. Stablecoin market cap versus its roughly $301 billion level and whether 30-day growth reaccelerates. Bitcoin options open interest into the September 25 expiry, where Glassnode's report places max pain at $72,000, close to the cost-basis line now in question.
Bottom line
- Glassnode's September 16, 2026 report puts Bitcoin's Short-Term Holder cost basis at $71,300, with $62,000 to $65,000 as the next support zone.
- US spot Bitcoin ETFs lost $450.4 million on September 15 and $295.9 million on September 16, per Farside Investors; Ether ETFs lost $142.3 million and $224.1 million on the same two days.
- Corporate treasuries bought about 5,900 BTC over the past three months, versus 89,000 BTC in July 2025 alone, according to Glassnode.
- Bitcoin's Realized Cap rose for 27 straight days through September 14, 2026 before turning negative on September 15 and 16.
Research and analysis only. Nothing here is financial advice or a recommendation to trade. Markets carry risk; decisions are your own.