1. Calculation and units
Assume a reference price of 100 USDT and a comparison price of KRW 143,000. If USD 1 = KRW 1,400 and USDT 1 = USD 1.01, USDT 1 is KRW 1,414. The reference becomes KRW 141,400. The premium is (143,000 / 141,400 − 1) × 100, about 1.13%. These are illustrative assumptions, not current quotes.
2. Keep the FX direction explicit
Multiply KRW per US dollar by US dollars per USDT to obtain KRW per USDT. USDT is not assumed to equal one dollar. Swapping the exchanges changes the denominator, so the premium does not simply reverse its sign.
3. Timestamps and missing values
FX is observed independently every 15 minutes. Where the source supplies no publication timestamp, the time records our observation. FX older than two hours is excluded from cross-currency comparisons; same-currency pairs remain comparable without FX. Stale quotes, large timestamp differences and provider failures can leave empty values. An empty value alone does not establish a delisting.
4. What the average does and does not mean
The displayed average is an unweighted mean over assets comparable for the selected pair. It is not the row count or a volume-weighted return. Last-price differences exclude order-book depth, fees, withdrawal restrictions, transfer time, conversion costs and taxes. They do not guarantee an achievable trading profit.
Sources and methodology
Compare and verify on the page
Open either exchange button to choose a venue. The same venue cannot fill both sides; use swap to reverse the direction. Search by symbol, Korean or English name. Star an asset to pin it above other rows. Select the star again to unpin it; your selection is saved in this browser. Open an asset name to see both original quotes, applied FX, the formula and receipt times. This view does not place orders.
How quotes arrive
Your browser receives official public quotes directly from the two selected exchanges. Stored FX and reviewed asset links are supplied by the service. Missing quotes caused by connectivity or exchange restrictions leave the comparison unavailable. Identical symbols belonging to different assets are not joined.
Initial display and connection failure
The first HTML contains valid saved quotes for reviewed core assets. Browser connections expand this to the selected exchanges’ full catalogs. Both use reviewed asset identities and the same conversion rules. Quotes older than five minutes from their original receipt are excluded; a visit never renews that clock. Changing exchanges cannot relabel the previous pair’s prices.