# - CRypto IndeX

CRIX: The CRyptocurrency IndeX is a benchmark for the crypto market. It is dedicated to give everyone, who is interested, insight about the current and past movement of this young market. The CRIX is realtime computed by the Ladislaus von Bortkiewicz Chair of Statistics at Humboldt University Berlin, Germany. The development was a joint work together with SKBI at Singapore Management University and CoinGecko, who still provide the data for the computation. Currently, the CRIX consists of 20 index members. This number was found with statistical methods, see for more details the Methodology.

#### Current cryptocurrencies in CRIX

Coin Name Price (in $) Market Cap (in$K) Volume (in \$K)

# Methodology

CRIX formula:

The CRIX is a market index and follows for the derivation the Laspeyres Index. The index of Laspeyres is defined as $INDEX_t^{Laspeyres} = \frac{\sum_i P_{it} Q_{i0}}{\sum_i P_{i0} Q_{i0}}$ with $$P_{it}$$ the price of the crypto $$i$$ at time point $$t$$ and $$Q_{i0}$$ the amount of crypto $$i$$ at time point $$0$$. $$P_{i0}$$ is the price at time point $$0$$. The final index formula is a modification of the Laspeyres index, given by $INDEX_t^{CRIX} = \frac{\sum_i MV_{it}}{Divisor},$ where $$MV_{it}$$ is the market capitalization of the crypto $$i$$ at time point $$t$$. The $$Divisor$$ ensures that the changes in the amount of coins of a crypto doesn’t affect the value of the CRIX. At the starting point of the CRIX is the $$Divisor$$ chosen such that $Divisor = \frac{\sum_i MV_{i0}}{1000}.$ The starting value of the CRIX is therefore chosen to be $$1000$$. Whenever the amount of coins of a crypto changes, the Divisor has to be adjusted. This shall ensure that just price changes cause changes in the value of the CRIX. The applied formula is $\frac{MV_{i,t-1}}{Divisor_{t-1}} = INDEX_{t-1}^{CRIX} = INDEX_{t}^{CRIX} = \frac{MV_{i,t}}{Divisor_{t}},$ where $$Divisor_{t-1}$$ is the $$Divisor$$ directly in front of the change in the amount of coins and $$Divisor_t$$ directly afterwards. Therefore, it is ensured that the CRIX starts again with the same value than directly before the change in the amount of coins.

Liquidity rule: It can happen, that a crypto has a high market capitalization and therefore shall be part of the CRIX. But if it is not traded frequently, it can’t be easily converted to traditional fiat money or other cryptocurrencies. On top of this drawback, a low relative trading volume to the rest of the asset universe shows that the users care more for other cryptos. In a representative benchmark shall be just included the cryptos which are used often. Two measures will be applied which are modified versions of the liquidity rules from the STOXX Japan 600 and the AEX Family. From the first is taken the approach to look at the Percentiles of the Average Daily Trading Volume ($$ADTV$$) and from the later the concept to take also the number of shares into account. The applied rules are the following:

1. 0.25 percentile of $$ADTV$$ $ADTV_i \geq ADTV_{0.25}$

where $$ADTV_{0.25}$$ is the $$0.25$$ percentile of the $$ADTV$$s of all cryptos in the last period and $$ADTV_i$$ is the $$ADTV$$ of a single crypto. The approach ensures that just cryptos which are liquid in relation to the other cryptos are eligible for the CRIX. The $$0.25$$ percentile is chosen as rule of thumb border for the tails of the empirical distribution because this value serves as an important lower bound in statistical analysis, e.g. the Box-plot. It ensures that the relatively less traded cryptos are excluded from the eligible ones for CRIX.

1. 0.25 percentile of Average Daily Traded Coins ($$ADTC$$) $ADTC_i \geq ADTC_{0.25}$

where $$ADTC_{0.25}$$ is the $$0.25$$ percentile of the $$ADTC$$s of all cryptos in the last period and $$ADTC_i$$ is the $$ADTC$$ of a single crypto. Since many coins have a very small price, is it likely that they will be excluded by the first rule from the eligible ones even when many coins are traded but volume will be still low due to the low price. But on the other hand, it doesn’t pay out to look just at the $$ADTC$$ since cryptos with a high price will be possibly less traded but attract much liquidity, e.g. Bitcoin.

Finally, if a crypto fulfills at least one of the two rules, it is eligible for the CRIX.

Number of Constituents:

To our knowledge are the number of constituents of an index normally fixed. This may be a good approach for relatively stable markets but the crypto market is a very fast and innovative one. To be able to find always the best benchmark, is it better to variate the amount of member such that always the best benchmark is provided. The used procedure for CRIX is based on the AIC and BIC criterion, which are the Akaike Information Criterion and the Schwartz Information Criterion respectively. First will be computed an index representing the total market by applying the CRIX formula with the necessary capping. But the Liquidity rule won’t be used so that really all cryptos are included. Afterwards will several indices with different numbers of constituents be computed. The index representing the total market will be treated as the observed values for the market situation and be compared against the indices to check which one provides the best approximation while using as less index members as possible. The Likelihood function for computing the AIC and BIC is based on stable distributions to ensure that a broad band of distributions can be covered. For more details, see the presentation in the references.

Weights:

Each cryptos in CRIX is weighted with its market capitalization.

Ranking:

After excluding cryptos which doesn’t fulfill the Liquidity rule will the cryptos be ranked by their market capitalization in the last period from highest to lowest. The number of cryptos, obtained from the rule for the Number of Constituents, with the highest market capitalization will be taken.

Reallocation:

The reallocation period of the CRIX is 1 month to ensure that the index is always up to date. This period is taken rather short such that the CRIX can react faster to changes in the crypto market. At this time point will be checked again the liquidity of the cryptos by taking into account the last month. Furthermore will be builded again the Ranking and afterwards are computed the weights of the cryptos by taking into account the rule described in Weights. On top of that will the $$Divisor$$ be adjusted.

Every 3 month will be checked if the number of constituents still fit the market well. For the computation will be used the values from the last 3 month to ensure that just the most recent values influence this important decision for the CRIX.

Special Events

1. If the current price for a crypto which is part of CRIX is not reachable from the exchanges is the CRIX made insensitive to its value as long as the value can’t be reached.

2. If a crypto vanished from the market while it is part of CRIX while its value be made insensitive until the next reallocation date is reached.

# References

Title Authors Year Get
Introductory Slides Simon Trimborn, Wolfgang Karl Härdle 2016
Publication Simon Trimborn, Wolfgang Karl Härdle 2015
Discussion Paper Simon Trimborn, Wolfgang Karl Härdle 2016
Programming Code Simon Trimborn
A first econometric analysis of the CRIX family Shi Chen, Cathy Yi-Hsuan Chen, Wolfgang Karl Härdle, Teik Ming Lee, Bobby Ong 2016
The Cross-Section of Crypto-Currencies as Financial Assets: An Overview Hermann Elendner, Simon Trimborn, Bobby Ong, Teik Ming Lee 2016
Investing with Cryptocurrencies - A Liquidity Constrained Investment Approach Simon Trimborn, Mingyang Li, Wolfgang Karl Härdle 2017
Pricing Cryptocurrency options: the case of CRIX and Bitcoin Cathy YH Chen, Wolfgang Karl Härdle, Ai Jun Hou, Weining Wang 2018

## Related websites

Website Description
Coinmarketcap Contains a broad overview on the cryptocurrency market with several financial data.
Coingecko Provides a ranking for cryptocurrencies based on information other than market data.
Blockchain.info Provides information about the transactions on the Bitcoin Blockchain.

# Data

When using the data, please acknowledge our work by citing the Paper "CRIX an Index for blockchain based currencies".
Title Date Format Get
CRIX closing data Current json
CRIX 24h data Current (CET/CEST) json
Manual/Paper 2016 pdf
The Crypto database contains market data for over 1000 cryptocurrencies, kindly provided by CoinGecko. Daily closing prices, market capitalization and trading volume data are available starting from 2014-04-01. The closing prices were measured at 12 am UTC. High frequency data on prices, 24h trading volume and market capitalization are available for 5 minute intervals since 2016-06-30, collected from CoinMarketCap.

# Team

### Wolfgang Karl Härdle

Prof. Dr. Wolfgang Karl Härdle is the director of the Ladislaus von Bortkiewicz chair of statistics at the Humboldt-University in Berlin. He is the theoretical core driver behind the project and gives scientific advice.

### Simon Trimborn

Simon Trimborn is a research assistant at the Humboldt-University in Berlin. He holds an M.Sc. in statistics and a B.Sc. in Business Administration from Humboldt-University and Hamburg University respectively. Simon is the founder of CRIX and is responsible for the derivation of CRIX and the infrastructure of the database.

### Alisa Kolesnikova

Alisa Kolesnikova is a researcher at Humboldt University focusing on machine learning and statistics with a Master degree in Management from St. Andrews University. She is a creator of the VCRIX volatility index and is now applying her finance experience in integration of scientific research into financial practices.

### David Lee Kuo Chuen

David Lee founded Ferrell Asset Management in 1999 and is currently the Director of Sim Kee Boon Institute for Financial Economics. He holds the appointment of Practice Professor of Quantitative Finance, Lee Kong Chian School of Business, in Singapore Management University. He graduated from the London School of Economics and Political Science with a PhD in Econometrics and Mathematical Economics. He gives scientific advice while the construction and supports the project together with his institute.

### Ernie Gin Swee Teo

Ernie Teo obtained his Ph.D. in Economics from the University of New South Wales in 2008. He is a research fellow at the Sim Kee Boon Institute for Financial Economics, Singapore Management University. He joined the institute after his extensive teaching experience as an Assistant Professor at Nanyang Technological University. He gives scientific advice to the CRIX project.

### TM Lee

TM is is the chief tech guy of CoinGecko. He holds a BS in Computer Science and a minor in Psychology from Purdue University. TM is a product engineer who loves building stuff from the ground up. He is together with Bobby the data provider for the cryptocurrencies from which CRIX is computed.

### Bobby Ong

Bobby is the chief economist of CoinGecko. He graduated with a degree in Economics from University College London in 2012. Bobby also curates AltcoinWeekly, a weekly cryptocurrency newsletter. He is together with TM the data provider for the cryptocurrencies from which CRIX is computed.

### Hermann Elendner

Hermann Elendner is a professor at the School of Business & Economics in Humboldt-Universität zu Berlin. He studies the cross section of cryptocurrencies and the gains from using CRIX as an investment vehicle.

### Cathy Yi-Hsuan Chen

Cathy Yi-Hsuan Chen is a professor at the School of Business & Economics in Humboldt-Universität zu Berlin, and a principal investigator of the International Research Training Group 1792 – High Dimensional Non Stationary Time Series. She studies the econometric models for the CRIX family and applies the text mining techniques to digital currencies.

### Shi Chen

Shi Chen is a research assistant at the Humboldt-University in Berlin. She holds an M.Sc. in Economics and Management Science from Humboldt-University, and B.Sc. degrees in Engineering and Economics from Xiamen University. Shi gives an econometric analysis of the CRIX family for portfolio investment.

# Imprint

Humboldt-Universität zu Berlin
Spandauer Str. 1
D - 10178 Berlin
Phone: +49-30-2093 5708

Responsible for the content: Prof. Dr. Wolfgang Härdle
Webmaster: Simon Trimborn

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