원화 프리미엄 · Seoul vs the world
See how much more a dollar costs in Korea, right now.
Korean crypto exchanges often sell digital dollars for more won than a bank would charge. We put the two prices side by side, live, so you can see the gap.
Reads Upbit and Bithumb public prices and the ECB reference rate. Read-only: nothing is bought, sold or charged.
How it works in 3 steps
- 一Open the page
No sign-up. Optionally connect a wallet or paste an address.
- 二We read two prices
Seoul exchange prices and the official bank rate, refreshed live.
- 三You see the gap
In percent and in won, for any amount you type.
Nothing here moves or charges money. There is nothing to sign unless you choose to.
Tool 1 · Live board
The gap, coin by coin
What this does: for each coin it compares the won price on two Seoul exchanges with what the same coin costs abroad, converted at the bank rate.
| Coin | Price abroad | Fair won price | Upbit | Bithumb |
|---|---|---|---|---|
| Loading live prices | ||||
…
Price abroad = Hyperliquid mid for BTC, ETH, SOL, XRP; Jupiter price for USDT; USDC counted at its $1.00 peg. Fair won price = price abroad × bank rate. Premium = Seoul price ÷ fair won price − 1.
Tool 2 · Calculator
What the gap means for your amount
What this does: type an amount and it shows what that many dollars are worth at the bank and in Seoul, and what is left of the gap after the costs you enter.
Enter an amount or press “Try an example”.
Fees and transfer cost are your own inputs, so the “after costs” line is a model, not a quote. Korean exchanges need a verified local account and bank link; moving money across borders has legal limits. This is not advice.
Tool 3 · Depth check
Does the gap hold for a big order?
What this does: walks the live order book to show the average price you would really get for a large order, and the gap at that price.
Tool 4 · History
The last 30 days of the gap
What this does: lines up each day's closing USDT price in Seoul with that day's ECB rate, so you can see whether today's gap is normal.
Your notebook
Every visit, this browser jots down the live gap. Stored only on this device.
Tool 5 · My coins
Your Solana coins, priced in Seoul
What this does: reads the SOL, USDC and USDT in a Solana wallet and shows their value in won at the bank rate and at Seoul prices.
Why a dollar has two prices
Why a dollar has two prices
- A dollar at the bank. Banks and the ECB publish one rate for won per dollar. That is the “world” price.
- A dollar on a Seoul exchange. USDT is a digital dollar. On Upbit it trades in won, set only by local buyers and sellers.
- The two drift apart. When local demand is strong, people pay more won for the same dollar. That extra is the premium.
- Why it does not vanish. Moving money in and out of Korea has limits and paperwork, so the gap can last for days.
Flowcharts
How the page works, and where data goes
Plain words
The few terms on this page
- Premium (kimchi premium)
- How much more, in percent, a coin costs in won on a Korean exchange than its world price converted at the bank rate. Negative means a discount.
- USDT and USDC
- Stablecoins: digital tokens designed to stay worth one US dollar each.
- Bank rate
- How many won one US dollar buys on the official currency market. We use the European Central Bank daily reference, plus an open market feed.
- Order book
- The live list of offers to buy and sell at each price. Large orders eat through it, so the average price gets worse.
- Wallet address
- A public account number on Solana. Looking one up shows balances; it can never be used to spend.
- Mainnet
- The real Solana network with real balances, as opposed to a test network.
Roadmap
What works today, and what comes next
- Done
Live board
USDT, USDC, BTC, ETH, SOL and XRP on Upbit and Bithumb against two bank-rate sources.
- Done
Calculator and depth check
Your amount, your costs, and the real order book walked step by step.
- Done
30-day history and notebook
Daily closes matched to ECB rates, plus a private log kept in your browser.
- Building
More Seoul venues
Adding other Korean exchanges once their public feeds can be read from a browser.
- Planned
Gap alerts
A browser notice when the gap crosses a level you pick. No accounts, no emails.
- Planned
Other currencies
The same view for other places where the local digital-dollar price drifts from the bank.
Tokenomics planned
The Wonwatch coin
The coin has not launched yet. This is the planned structure. The tools above are free and need no coin.
- Total supply
- 0 fixed
- Presale
- None
- Team allocation
- 0%, only what the team buys on the public curve
- Mint and freeze authority
- Turned off
- Liquidity
- Locked or burned when the curve completes
Where the billion goes
- Price
- …
- Market cap
- …
- Supply on chain
- …
- Holders
- …
A coin is not a share in anything and nobody promises it will be worth more. The site never asks you to buy it.
Questions
Asked and answered
What is this, in one sentence?
A free page that shows, live, how many more won a digital dollar costs on Korean exchanges than at the bank rate.
Is it safe? Does it touch my money?
It only reads public prices and, if you ask, public wallet balances. It cannot move funds, has no account system, and connecting a wallet shares only your public address.
Where do the numbers come from?
Seoul prices come straight from the public Upbit and Bithumb price feeds. World prices come from Hyperliquid and Jupiter. The bank rate is the ECB daily reference, with an open market feed as a second opinion.
Why does the gap exist at all?
Korean exchanges trade only against local won accounts, and moving money across the border has limits. So local demand can push the price above, or below, the world rate.
Can I profit from it?
Maybe not. Real access needs a Korean bank account, verification and legal transfers, and costs eat into small gaps. The calculator shows the arithmetic; it is not advice.
Why is the ECB rate a day old?
The ECB publishes once each working day. That is why we also show an open market feed and let you switch between them.