This tool simulates the calculation methodology of the ETHUSD_RR benchmark which occurs daily between 15:00 and 16:00 London Time using 12 partitions.
Neutral (Sideways)
Bullish (Rising)
Bearish (Falling)
High Volatility (Choppy)
Please enter valid numeric values for price and volatility.
Simulated CME CF Ether-Dollar Reference Rate
0.00
Calculation Breakdown (12 Partitions): The final rate is the arithmetic mean of the Volume Weighted Median Price (VWMP) of these 12 partitions.
Partition #
Time (London)
VWMP (USD)
Understanding the CME CF Ether-Dollar Reference Rate Calculation Window
The CME CF Ether-Dollar Reference Rate (ETHUSD_RR) acts as a definitive benchmark price for Ether in U.S. Dollars. It is widely used by financial institutions to settle derivative contracts, such as Ether futures traded on the CME Group exchanges. Understanding the specific calculation window time and methodology is crucial for traders and analysts tracking the settlement prices.
The Critical Calculation Window: 15:00 – 16:00 London Time
Unlike standard crypto spot prices which fluctuate continuously 24/7, the Reference Rate is a daily benchmark calculated over a specific one-hour observation window. This window is strictly defined as:
Start Time: 15:00:00 London Time
End Time: 16:00:00 London Time
This period corresponds to a time of high liquidity in both European and US markets, ensuring the rate reflects accurate market sentiment.
The 12-Partition Methodology
To prevent market manipulation and mitigate the impact of price anomalies (flash crashes or spikes), the rate is not a snapshot at a single second. Instead, the methodology divides the one-hour window into 12 equal partitions of 5 minutes each.
The calculation follows these steps:
Data Aggregation: Transactions are aggregated from constituent exchanges (such as Bitstamp, Coinbase, Gemini, itBit, Kraken, and LMAX Digital) for the specific partition.
VWMP Calculation: For each 5-minute partition, a Volume Weighted Median Price (VWMP) is calculated. This filters out outliers by focusing on the median, weighted by trade volume.
Final Averaging: The final Reference Rate is the simple arithmetic mean (average) of the 12 partition VWMPs.
Mathematical Formula
The formula for the final Ether-Dollar Reference Rate ($R$) is:
R = (P1 + P2 + P3 + … + P12) / 12
Where P represents the Volume Weighted Median Price for each of the 12 partitions.
Why This Matters
For institutional investors and traders holding CME Ether futures, the price determined during this specific window dictates the daily settlement or final cash settlement of contracts. The averaging mechanism over 12 partitions ensures that a single large trade cannot significantly skew the benchmark, providing a robust and reliable reference price.
function calculateReferenceRate() {
var basePriceInput = document.getElementById('basePrice');
var volatilityInput = document.getElementById('volatility');
var trendInput = document.getElementById('marketTrend');
var resultSection = document.getElementById('resultSection');
var finalRateDisplay = document.getElementById('finalRateDisplay');
var tableBody = document.getElementById('partitionTableBody');
var errorMsg = document.getElementById('errorMsg');
// Parse inputs
var price = parseFloat(basePriceInput.value);
var volPercent = parseFloat(volatilityInput.value);
var trend = trendInput.value;
// Validation
if (isNaN(price) || isNaN(volPercent) || price < 0 || volPercent < 0) {
errorMsg.style.display = 'block';
resultSection.style.display = 'none';
return;
}
errorMsg.style.display = 'none';
// Simulation Variables
var partitions = [];
var totalSum = 0;
var currentPrice = price;
var times = [
"15:00 – 15:05", "15:05 – 15:10", "15:10 – 15:15", "15:15 – 15:20",
"15:20 – 15:25", "15:25 – 15:30", "15:30 – 15:35", "15:35 – 15:40",
"15:40 – 15:45", "15:45 – 15:50", "15:50 – 15:55", "15:55 – 16:00"
];
// Clear previous table
tableBody.innerHTML = "";
// Generate 12 Partition VWMPs
for (var i = 0; i < 12; i++) {
var change = 0;
var randomFactor = (Math.random() – 0.5) * 2; // -1 to 1
var volAmount = price * (volPercent / 100) / 12; // distributing volatility across steps
if (trend === 'bullish') {
// Bias upwards
change = volAmount * (randomFactor + 0.5);
} else if (trend === 'bearish') {
// Bias downwards
change = volAmount * (randomFactor – 0.5);
} else if (trend === 'volatile') {
// High variance, no direction
change = volAmount * randomFactor * 3;
} else {
// Neutral
change = volAmount * randomFactor;
}
currentPrice = currentPrice + change;
// Ensure price doesn't go negative
if (currentPrice < 0) currentPrice = 0.01;
partitions.push(currentPrice);
totalSum += currentPrice;
// Add row to table
var row = "