A 12.71% hour inside a 19.87% falling week forces a collateral trigger rethink
Should the lender widen its required collateral margin and liquidation cushion on ETH-backed loans now, or keep its existing terms and rely on the current trigger given Tuesday's hourly collapse?
The market facts are real; the decision maker is illustrative.
The week and the position
In the week of 23 September 2019, ETH fell 19.87%, from 211.20 to 169.24, with a 17.61% drop on Tuesday and a 12.71% fall in the hour starting 18:00 UTC that day, reaching the week's low of 150.03 at 19:00 UTC. The week's range was 41.09%, realised volatility ran at 127.3% annualised, and dollar volume was 1.87 times the prior 12-week average. ETH was 52.71% below its 52-week high after three rising weeks. An illustrative lender liquidates ETH collateral below a fixed trigger.
Judgment
A liquidation trigger only protects the lender if collateral sells near the trigger price. A 12.71% hour can carry ETH through the trigger and the cushion behind it before a sale completes, and this week's volume was high enough to suggest fills at gap prices. Raise the required margin for new ETH-backed loans and set the cushion from the worst hourly move, not the weekly average. Keep existing loans at their agreed terms rather than retroactive margin calls, and hold the ETH sale path where it can execute outside a single congested hour.
What would change it
If the lender's own records show this week's liquidations filled close to the trigger price, the case for a wider cushion weakens. If hourly moves contract for several successive weeks and ETH holds above the 150.03 low, the margin can be reviewed downward.
What sets this case apart
The decision turns on how fast collateral loses value within one hour, not on the size of the weekly loss or on the asset's direction against BTC.