The 30-year Treasury yield settled at 5.19% on Wednesday, August 19, down 9 basis points from 5.28% the session before, while the 2-year did not budge and closed at 4.19% for the third straight session. That shape has a name. It is a bull flattener, and it printed on the exact session Bitcoin closed up 7.12% on its way to a three-session run of roughly 21%.
On Thursday, August 20 we published a full explainer on the bear steepener, the mirror-image shape, and argued that Bitcoin had diverged from it. The curve then delivered the opposite move. What that reversal says about August 19 turns out to be far more useful than what it says about us.
What Treasury's Own Settles Show for the Week of August 17
Everything below comes from the Treasury Department's daily par yield curve series, pulled as raw CSV at 14:36 UTC on Sunday, August 23, 2026. Every figure is a settle rather than an intraday print, and no intraday number appears anywhere in this article.
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Settlement date
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2-year
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10-year
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30-year
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2s30s spread
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Monday, August 17
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4.19%
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4.72%
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5.31%
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112 bps
|
|
Tuesday, August 18
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4.19%
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4.71%
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5.28%
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109 bps
|
|
Wednesday, August 19
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4.19%
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4.65%
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5.19%
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100 bps
|
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Thursday, August 20
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4.19%
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4.69%
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5.23%
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104 bps
|
|
Friday, August 21
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4.24%
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4.74%
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5.27%
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103 bps
|
The August 19 session is the one that matters, and the way to see it properly is to walk the whole curve rather than two points on it. The 3-month and 6-month bills were both unchanged, the 1-year moved a single basis point, the 2-year moved none at all, the 5-year fell 2, the 10-year fell 6, and the 30-year fell 9.
Read that ladder again. The size of the move grows steadily with maturity, from nothing at the front to 9 basis points at the back, and a rally that clean is the bond market repricing duration and nothing else. It is about as unambiguous a signal as the curve ever hands anybody.
One correction belongs here because it is still circulating. Headlines that week described the 30-year hitting a 19-year high on Tuesday, August 18 at 5.323%. That figure is an intraday extreme rather than a settle, and on a closing basis August 18 actually fell 3 basis points. The week's highest settle was Monday, August 17 at 5.31%, which I checked against every 30-year par-yield settle Treasury has published since 2007. Nothing between 2008 and 2025 came within 20 basis points of it, and the last higher close was 5.35% on June 12, 2007.
What a Bull Flattener Is and What It Normally Signals
Four shapes cover every curve move, and the labels confuse people because "bull" and "bear" describe the bond rather than the economy. Bond prices move inversely to yields, so falling yields make it a bull shape no matter what the growth picture looks like.
A bull flattener means yields are falling and the long end is falling faster, so the gap between a short maturity and a long one narrows. The textbook reading is cooling growth expectations, cooling inflation expectations, or a fading risk premium on long-dated debt, because the long end prices the distant future rather than the next few central bank meetings.
What it signalled on August 19 is narrower than any of those. Nine basis points is a normal day at the back end of a curve that had just printed a 19-year closing high, and term premium coming off a stretched level is what stretched levels tend to do. The interesting part is not the size of the move. It is the location.
The Grade on Our Own Bear Steepener Piece
That explainer was written on the morning of Wednesday, August 19 off data running through the Tuesday, August 18 settle, and it went live the following day. Its central claim was that the curve had steepened into Monday, August 17, that long yields were leading, and that Bitcoin's simultaneous gain proved nothing either way.
Filing that as a call overtaken inside a week would be the easy verdict, and it would also be wrong. The piece had already flagged that Tuesday, August 18 took part of the move back, and it identified that session in plain text as a bull flattener. Its closing section anchored on the 112 basis point spread from August 17 and named the precise alternative to watch for, a narrowing driven by falling long yields.
That narrowing arrived the very next session. The spread walked from 112 to 109 to 100 basis points, driven almost entirely by a 30-year yield that dropped 12 basis points across two sessions while the 2-year sat still. A piece that names the configuration it is watching for and then gets it has not been overtaken by events. It has been confirmed faster than the person writing it would have guessed.
Where the record is genuinely mixed is duration, because the flattening did not hold cleanly. Thursday and Friday walked the spread back out to 104 and then 103 basis points, and across the full stretch from the August 18 settle to the August 21 settle the curve flattened 6 basis points with the 2-year up 5 and the 30-year down 1. That is a bear flattener led by the front end, a different animal from the Wednesday move, and anyone who read August 19 as the start of something durable got a two-session trend instead.
The Front End Did Not Move and That Is the Entire Finding
The federal funds target range sits at 3.50% to 3.75%. The 2-year was pinned at 4.19% through Monday, Tuesday and Wednesday of that week, roughly 57 basis points above the midpoint of the range, which describes a market that already expects tightening and did not change its mind on August 19.
That is the part worth carrying out of this. The July 28-29 FOMC minutes were released at 18:00 UTC on Wednesday, August 19, and they were the headline most commentators reached for to explain the crypto move. The minutes themselves record a 9-3 hold with Beth Hammack, Neel Kashkari and Lorie Logan each preferring a quarter-point increase, alongside the line "many participants assessed that policy tightening would likely be necessary if inflation did not decline." In Fed drafting many outranks several and several outranks some, so that is a hawkish document by the institution's own vocabulary.
A hawkish document that surprises the market lifts the front end. The front end did not lift. Whatever the bond market took from those minutes, it was not a changed view of the policy path, which is exactly the question the 2-year exists to answer. Worth noting alongside it that Kevin Warsh chairs this committee and Jerome Powell is a plain governor who voted with the majority to hold, so anyone still reading Fed communications through the previous chairmanship is reading the wrong body. Warsh's arrival at the Fed changed how the institution talks, and rate expectations have historically reached crypto through the projection materials rather than any single statement, and the September meeting is one of the four in 2026 that carries them.
Two unrelated markets ran the same test on the same afternoon and returned the same answer. The hourly crypto tape put the biggest hour of the entire run before the minutes were public. The Treasury curve showed a front end that never flinched when they were. Neither is proof standing alone, and together they make the Fed-minutes explanation for August 19 quite hard to hold.
Six Basis Points Is Not a Crypto Catalyst
This needs saying flatly. The curve did not move Bitcoin and Bitcoin did not move the curve, and anyone selling a causal chain in either direction is selling a story rather than a finding.
The sizes make the argument without help. Bitcoin closed at $64,726.53 on Tuesday, August 18 and at $78,338.02 on Friday, August 21, a gain of 21.03% on Phemex's own spot series pulled at 14:36 UTC on Sunday, August 23. Our piece published Sunday, August 23 put the same run at 21.1% using a different venue's Tuesday close, and CoinGecko has since revised its Friday close upward, which lifts that calculation again. Three sources, three closes, all inside three tenths of a point, which is why "about 21%" is the number to say out loud. Set a 6 basis point change in a spread against that and you are comparing a rounding error to a regime.
What the curve does provide is elimination. It rules out a repricing of Fed policy as the driver of that week, because a repricing of Fed policy has a signature and the signature is missing. That pushes the explanation toward the mechanism our own reporting landed on, a crowded short book in perpetual futures unwinding into thin liquidity, where a forced buy is a market buy regardless of price and the process feeds itself. Bitcoin's long record of selling off after Fed eventsis the other reason the minutes explanation sat badly from the beginning.
Frequently Asked Questions
What is a bull flattener in simple terms?
Yields fall across the curve and the long end falls faster, so the gap between short and long maturities narrows. The usual reading is that expectations for growth, inflation or the premium on long-dated debt are cooling, and it is the shape that takes pressure off assets valued on distant cash flows.
Does the yield curve predict Bitcoin's direction?
No, and the daily relationship is close enough to zero that trading it would be gambling with extra steps. The curve earns its keep by explaining why a whole class of assets reprices and by ruling explanations in or out after the fact, which is a different job from forecasting.
Why watch the 2-year instead of the 30-year for Fed news?
The 2-year is the maturity that policy expectations dominate, because it spans roughly the next eight scheduled meetings. If a Fed release genuinely changes the expected path, the 2-year moves first and moves most, and a 2-year that sits still through a release is telling you the release contained no news.
When is the next scheduled Fed decision?
The Federal Open Market Committee meets on Tuesday, September 15 and Wednesday, September 16, 2026, and the Fed's own published calendar flags it as a projection-materials meeting. Before that, the July personal income and outlays release carrying core PCE lands at 12:30 UTC on Wednesday, August 26, and that is the front end's next real test.
Bottom Line
The spread is the number to track and 103 basis points from the Friday, August 21 settle is the line. A narrowing from there on falling long yields is another bull flattener and it eases the discount rate on everything long-duration. A narrowing driven instead by the 2-year climbing is a bear flattener, which means the market is pricing tightening, and that is the version with a history of hurting crypto.
Two dates decide which one shows up. Core PCE on Wednesday, August 26 and the FOMC decision on Wednesday, September 16 are the only scheduled events with enough content to move the front end, and the 2-year at 4.19% to 4.24% already sits more than half a point above the target range midpoint, which is a market that has priced two hikes it has not yet been given.
August 19 is worth remembering for what it eliminated rather than for anything it caused. When two unrelated markets get asked the same question on the same afternoon and both answer that the Fed did not do this, the burden of proof moves to whoever still says it did.
This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency trading involves substantial risk. Always conduct your own research before making trading decisions.
