Dollar-yen printed 160.19 just after three in the afternoon in Tokyo — 06:32 UTC — which is nineteen pips through the big figure and the furthest the pair has been above it in this episode. Nineteen minutes later it was 159.66. Fifty-three pips, in nineteen minutes, with the Prime Minister and the Finance Minister both already on the record about the currency that morning. The option market’s response to all of this was to make protection against a stronger yen seventeen per cent cheaper than it was a week ago. That is not a contradiction, and working out why it is not is the whole of this note.
Fifty-three pips in nineteen minutes is a liquidity statistic, not a volatility one
Take the surface first, because it sets the denominator. The one-week dollar-yen implied volatility quoted at the Tokyo 16:30 reference — 07:30 UTC — is 7.09 per cent. On two hundred and fifty-two business days that is a one-day deviation of 71.4 pips at a spot of 159.80. So the move from 160.19 to 159.66 is 0.74 of a standard day.
It happened in nineteen minutes, which is 1.32 per cent of a day. Three-quarters of a day’s move inside one and a third per cent of the day — a concentration ratio of about fifty-six to one against the uniform case. Measured as a rate it is 2.79 pips a minute sustained for nineteen of them.
Here is why that distinction matters to anyone sizing a position rather than forecasting one. A volatility number is a statement about a day. It tells you nothing about whether the day’s range arrives spread across fourteen hours or in one burst while the Tokyo afternoon thins out and London has not properly arrived. The surface was 5.89 per cent on Wednesday, 6.67 per cent on Thursday morning and 7.09 per cent this morning — up 20.4 per cent in two days, widening the implied daily deviation by 12.1 pips. The surface is doing its job. It is repricing the size of the day. What it cannot and does not price is that the day is being delivered in nineteen-minute instalments, and a stop placed at a sensible multiple of 71.4 pips is a different object depending on which of those two worlds you are in.
Compare it with last night. The overnight move was 75.0 pips, 1.12 deviations on the then-current surface, and it took hours. Today’s was smaller in pips and vastly larger in pips per minute. If your risk model carries one number for the day, those two sessions are nearly the same session. They are not.
Three officials in five hours, and the market paid less for yen upside, not more
The talking happened early. The Finance Minister spoke at 00:47 UTC, saying recent moves had been sharp and one-sided and that Japan would work closely with the United States Treasury and respond appropriately — that is two publishers, one of them a body, and the same official we named yesterday. Then at 04:49 to 04:55 UTC the Prime Minister added four separate remarks, among them that Japan and the United States are communicating to keep the currency market orderly and that responsible fiscal policy is what keeps confidence in the yen.
That is the first time in this episode the head of government has been in the conversation rather than the ministry. Two and a half hours after the last of those remarks the pair went to its highest print of the episode. Make of the sequencing what you like; we are not going to claim a causal direction on it, because nobody published one we could check.
What is checkable is the price of insurance. The one-month twenty-five delta risk reversal reads −1.6700, yen calls over. A week ago it was −2.0150. So over the week in which spot went through 160 and three official statements landed, the premium for protection against a sharply stronger yen fell 0.345 of a point — it got 17.1 per cent cheaper. Against our own reading of −1.8775 on Wednesday it is 11.1 per cent cheaper.
At the same time, one-week volatility went up 20.4 per cent. Those two facts are not in tension, and conflating them is a common and expensive error. Volatility prices the size of the move. The risk reversal prices the direction people want to be insured against. What the pair of them say together is: the market has raised its estimate of how much this moves and lowered its estimate of the chance that the move is a yen-strengthening air pocket of the kind an intervention produces. The publisher that computed the table says as much in its own text — intervention wariness is present, but demand to hedge the yen downside is not notably elevated. That is one desk’s characterisation and we flag it as such; the two numbers underneath it are ours to check and they do check.
The uncomfortable version, and we think it is the right one: official statements have been priced as talk. Not dismissed — the vol bid is real — but specifically not priced as an imminent jump risk in the yen’s favour. If you are running yen exposure into a weekend on the theory that the warnings are the signal, the skew is telling you that you are early, or alone, or both.
The 200-day has a third point at last, and it landed one pip from our own forecast
For fifteen slots this desk said it could not find a dated 200-day moving average for dollar-yen. On Wednesday one turned up with two dated points — 158.69 on Tuesday the tenth, 158.71 on Wednesday the eleventh — a drift of 2.0 pips a day. Today a technical note carries a 200-day line at 158.74, body-read, and gives it no date whatsoever.
So we did the only honest thing available and tested it. Extending 2.0 pips a day from Wednesday to today predicts 158.75. The observed figure is 158.74. The miss is one pip.
- Our dated series: 158.69 (Tuesday) and 158.71 (Wednesday), measured drift 2.0 pips a day.
- Predicted for today on that drift: 158.75.
- Observed today, undated: 158.74. Miss: 1.0 pip.
- Implied drift if today’s figure really is today’s: 1.5 pips a day over the two days, against a measured 2.0.
We want to be precise about what that buys and what it does not. It does not date the number. A figure one pip from the forecast is consistent with today, and also consistent with yesterday, because the whole series moves two pips a day — which is exactly the problem we have been publishing about this line for a fortnight. What it does establish is that the undated quote is not from some other week and not from another vendor’s differently-specified average. It is the same object, within a pip, which is more than we could say before.
Spot at 159.80 is 106.0 pips above it; this morning’s high was 145.0 above. The same note puts the 21-day at 158.22, which is 52.0 pips below the 200-day — a short average under a long one while price sits a hundred pips over both. Neither average is anywhere near this market, and a system using either as a trend filter is reading a line that has been irrelevant for a week.
Twenty pips to September, and three of seven curves are now inverted at the front
The high of 160.19 sits 20.0 pips below the second of September high of 160.39, which is the level our own correction established two slots ago and which a Tokyo technical desk independently names today as the first hurdle. Above it that note gives 160.50, then 161.00, 162.00 and 163.00; below, 159.00, then the two averages above.
Twenty pips, on a surface pricing 71.4 a day, is 0.28 of a deviation. The level that every headline this week has treated as the next line in the sand is, on the option market’s own arithmetic, less than a third of an ordinary day away. We said something very like this on Thursday about the big figure itself, and the big figure has since been cleared twice — by 4.9 pips last night and by 19.0 this morning, today’s excursion nearly four times last night’s.
One structural note from the same table, because it has moved. Across the seven pairs it quotes, three now price one-week volatility below one-month: dollar-yen at 7.09 against 7.21, dollar-Swiss at 6.70 against 6.86, and — newly — euro-dollar at 6.15 against 6.19. On Thursday it was two of seven. The mechanism is a date: the Federal Reserve meets in twenty-five days, inside a one-month option and outside a one-week one. Euro-dollar joining the list says the front-end bid in that pair has now faded enough for the meeting to dominate its own curve too.
And the steepness ranking we published on Wednesday has moved again. Dollar-yen’s one-week over one-year ratio is 0.8615 today against 0.8386 on Thursday and 0.724 on Wednesday, and it now ranks fifth of seven, behind euro-dollar at 0.9152. We have had this ordinal at first, third, second and now fifth in three days. On Thursday we wrote that a ranking built on a ratio whose numerator moves a point in a day was the wrong object to publish. This is the fourth reading and we are holding that verdict rather than retracting it: the level is a fact, the rank is noise, and we are printing both only so the record shows the rank moving again.
What this does not tell you
- The high is not settled to the pip across publishers. We have 160.19 at two sources, one of them a body. A third publisher, writing at 08:14 UTC, gives today’s high as 160.03 — sixteen pips lower, and within 1.9 pips of last night’s high of 160.049. We think that is the likeliest explanation and we cannot prove it, so the honest statement is that the published range for today’s high is 160.03 to 160.19 and the weight of evidence is at the top of it.
- We have no exact timestamp for the low. The 159.66 figure is body-read at one publisher and matched at a second; 06:51 UTC is the time of the headline reporting the fall, which is an upper bound on when it happened, not a measurement.
- The 200-day is still undated. Everything in that section is a consistency test, not a dating. We have not closed the open item, we have only shown the new point belongs to the same series.
- We did not establish a cause for the reversal. No source we read gives one. Options expiring at the Tokyo cut were named as being in focus by one analyst, with no strikes attached, and we are not building anything on that.
- We could not read an option expiry board for today’s New York cut. Ninth consecutive session. Our sister desk explains in the companion piece why that is now arithmetic rather than bad luck.
- The risk reversal is one vendor’s table. We have no second computation of it, and the week-ago comparison is that same vendor’s own prior figure rather than an independent reading.
- Nothing here forecasts the yen. Every argument above is about how much a day is worth and when within the day it arrives, which is a sizing question. We do not know whether 160.39 breaks.
Related
- FX events calendar · release times in UTC, Tokyo and London windows
- Signals · how we structure entries around scheduled releases
- Presets · news-window and filter configuration
