Why exchange rates change all day in 2026: a 3-minute primer
⚡ 30-Second Answer: FX rates move due to ①central bank rate gaps (Fed vs BoJ), ②trade balance, ③geopolitical risk, ④speculative capital flows, and ⑤real demand (travel + trade settlement). 1-3% daily moves aren't rare. Travelers should plan for ±5-10% swings over a 2-3 month booking window — use mid-rate-tracking services like Wise/Revolut to hedge.
Quick Reference
Value
Key drivers
Rate gaps, trade, geopolitics
Typical daily move
0.3-1.0%
Big move days
1-3% (central bank events)
2-3 month range
±5-10%
Hedge
Wise/Revolut tracks mid
Last verified
June 2026
📖3 min read
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Contents📖 ~3 min read
Exchange rates change continuously during forex market hours
(Sunday evening UTC through Friday afternoon UTC) because the
global forex market trades 24 hours, with banks and institutions
constantly updating bid/ask prices based on supply, demand, and
news. Retail Japanese exchange shops typically update 1–3
times per day, so the rate you see at a shop may lag the live
mid-market by hours.
TL;DR
Forex trades 24/5 — Sunday evening through Friday
afternoon UTC.
Retail shops update 1–3 times daily — they're not
real-time.
The shop rate is essentially "morning's mid-market" + a
spread — pre-built into the displayed number.
Best time to exchange: late morning when shops have
updated for the day.
How does the global forex market work?
Three things drive continuous price changes:
1. Supply and demand
Every minute, dozens of major banks make currency trades worth
billions of dollars. Those trades shift the bid/ask prices
that determine the mid-market rate.
2. News and economic data
Interest rate announcements (BOJ, Fed, ECB), GDP releases,
unemployment numbers, geopolitical events — each causes
immediate rate movements.
3. Carry trade and macro positioning
Hedge funds and institutions take long-term currency positions;
their entry/exit moves the market.
The result: USD/JPY can move 0.3–1.5% in a single day, with
some weeks seeing 3–5% movements.
How fast do retail shops update?
Shop type
Update frequency
Wise / Revolut
Real-time at transaction
Major Japanese ATM (7-Eleven Seven Bank)
Real-time via card network
Dedicated Tokyo exchange shop
1–3 times daily
Small pawn-shop FX windows
Once daily (morning)
Hotel front desks
Once daily or less
The lag means: the rate you see at a small Tokyo shop in the
afternoon may reflect the morning's mid-market, not the current
afternoon's. If the rate has moved overnight or during the day,
the shop rate may be slightly stale.
What causes the biggest USD/JPY moves?
BOJ interest rate decisions (twice quarterly) — biggest
single-event moves
Fed rate decisions (every 6 weeks) — equally big
Major geopolitical news (rare, but huge moves possible)
Carry trade unwinds during global market stress
What this means for your trip
✅ Time exchanges in late morning when shops have updated.
✅ For real-time rates, use Wise/Revolut card transactions
or 7-Eleven Seven Bank ATMs (network rate).
✅ Check the live mid-market before walking in — Yen
Finder shows it.
⚠️ Don't try to time the market for a 1-week tourist trip
— the daily moves are usually smaller than the spread cost.
Frequently asked questions
Are forex markets really 24/5?
Yes — Sunday evening (UTC) through Friday afternoon (UTC).
Some specific exchanges have brief breaks but the global market
is continuous.
Why don't shops update in real-time?
Operational cost. Real-time updates require automated systems;
small shops post manually. Wise and Seven Bank ATMs have the
infrastructure for real-time pricing.
When are forex rates most volatile?
Around BOJ/Fed/ECB announcements (specific dates)
During global financial market stress
Within the first hour of European/US market open
Should I time my exchange to a specific market hour?
For a tourist trip, no — the daily move is usually 0.3–1.5%,
small relative to the shop spread (1–3%). Optimize the shop,
not the timing.