Are Cryptoassets Highly Correlated?
An exploration of relationships between Bitcoin and other large cap digital assets
March 20th 2019
Cryptoasset markets exhibited wild movements in USD prices between 2017 and 2018. Bitcoin moved from a low of $735 to a peak of $19,800 in 2017, before finishing 2018 below $4,000. Ethereum, the second largest cryptoasset by market capitalization, moved from $8 to a peak of $1,440, before closing 2018 at a price below $150. Cryptoassets are generally known to move in similar directions. However, conducting correlation analysis across multiple time periods reveals additional elements that may influence the strength and direction of these correlations.
- USD returns for the top 30 cryptoassets by market cap were highly correlated over the past 3 months (1 Dec 2018 - 1 Mar 2019). Bitcoin (BTC) exhibited the highest correlation with other assets indicating that it is the bellwether of the industry.
- BTC-denominated returns for large market cap cryptoassets exhibited significantly lower correlations than USD-denominated returns over the same period.
- Correlations of cryptoasset returns in BTC terms in late 2018 were much lower compared to late 2017.
- In contrast, correlation between cryptoasset returns in USD terms actually increased when comparing the same two periods. This has coincided with the rise of stablecoins pair dominance during 2018 and is in line with the overall decline in the contribution of BTC pairs to total industry trade volume.
- Similar to equity markets, idiosyncratic factors influence the correlation of some coins over specific time periods.
- Additional factors beyond project-specific news & catalysts may influence the strength of correlations among cryptoassets:
- “Binance Effect”: digital assets listed on Binance oftentimes have higher correlations among themselves.
- Consensus Mechanisms: the type of consensus mechanism could impact the correlation between returns of cryptoassets (e.g., returns of PoW coins exhibited higher correlations amongst themselves than with non-PoW coins.)
1. Three-month correlations within the cryptoasset market
In general, assets with a correlation above 0.5 or below -0.5 are considered to have strong positive/negative correlations. Conversely, a close-to-zero correlation indicates no linear relationship between two variables, and for the purpose of this analysis, the returns of two assets. If the returns of two assets do exhibit a positive correlation, it implies that the two assets are, to some extent, moving in the same direction, and therefore share similar risks. On the other hand, a negative correlation between the returns of two assets indicates that the two assets are moving in opposite directions, and it is thus possible to use one asset as a hedge against the other.
1.1 Cryptoassets exhibited high correlations in USD terms at the beginning of 2019
To explore correlations between cryptoassets, the top 30 largest cryptoassets by 90-day average market cap were selected and their USD returns were calculated in order to create a correlation matrix as seen below.
Chart 1 - Large-cap asset 3-month daily return correlation matrix (USD) Dec 1 2018 - Mar 1 2019
Based on this analysis, correlations are highest between altcoins and Bitcoin itself (average correlation of 0.78), indicating that most of the altcoins move in similar directions as Bitcoin, underscoring Bitcoin’s status as a bellwether for cryptoasset markets.
While, generally speaking, altcoins are highly correlated with BTC, select cryptoassets exhibit materially weaker correlations both with BTC and among one another, which suggests that additional idiosyncratic factors may affect the prices and returns of these assets.
Examples of assets with the weakest correlations in USD terms include Waves (WAVES), Tron (TRX), Bitcoin Satoshi’s Vision (BSV), Binance Coin (BNB) and Dogecoin (DOGE).
While this report doesn’t intend to provide a direct explanation for specific weaker correlations, some recent news adds additional context that may be informative in understanding possible reasons for these lower correlations.
Possible idiosyncratic factors and events influencing correlations over this period:
- WAVES: raised an additional $120 million in December 2018
- TRX: BitTorrent ICO on Binance Launchpad, which required TRX or BNB to participate
- BNB: Launchpad hosted two token sales successfully and the DEX testnet went live
- BSV: Hard-fork (commonly referred to as the "hash power war") from Bitcoin Cash (BCH)
In addition to project specific catalysts, consensus mechanism design and exchange listings also potentially influence correlations among specific assets:
Of the top 30 market cap coins previously highlighted, only three of them are not listed on Binance - Dogecoin (DOGE), MakerDao (MKR) and Tezos (XTZ). These three cryptoassets exhibit lower than average correlations, which could be a function of less liquidity, resulting in thinner order-books and increased difficulty for investors to buy and sell them with similar frequencies as the other listed assets. Although this is a preliminary observation, these relationships may exist and merit further consideration in future reports.
Additionally, it appears that consensus mechanism type may play a role in the strength of correlations among coins, as Proof of Work (PoW) cryptoassets seem to exhibit higher correlations with one another than with non-PoW assets. Further analysis on correlations among coins with different consensus mechanisms is forthcoming, but of particular interest is the upcoming transition of Ethereum from PoW to PoS and what implications this development may have on its correlation with PoW coins.Broadly speaking, the observation that consensus mechanism may influence correlations among cryptoassets has already been highlighted in previous reports, but still requires additional investigation as new protocols are built leveraging novel consensus mechanisms.
1.2 BTC returns exhibited lower correlations at the beginning of 2019
In order to analyze correlations of returns across cryptoassets, it is instructive to compare returns of the same assets (top 30 largest coins by 3-month avg. market cap) in both USD and BTC terms over the same time horizon.
Correlations in BTC returns are important as BTC remains one of the best price indicators of crypto markets for two key reasons:
- Liquidity: BTC is tradable against almost all altcoins
- Market capitalization accounts for nearly half of the total cryptoasset industry
- Volume represents a significant percentage of the industry
For the purposes of comparing BTC and USD returns of this asset class, it is important to understand the components that comprise BTC returns.
For every cryptoasset, its USD return can be broken down into two components:
- BTC/USD return
- Cryptoasset/BTC return
Therefore, for any cryptoasset (referenced below as “ABC”), its return can be expressed as:
returnabcusd = (1 + returnbtcusd) * (1 + returnabcbtc) - 1
As a result, cryptoasset returns - calculated based on Bitcoin prices - can be viewed as Bitcoin-adjusted returns.
Chart 2 - Large-cap asset 3-month daily return correlation matrix (BTC) Dec 1 2018 - Mar 1 2019
The correlation of cryptoasset returns based on BTC prices (i.e., Bitcoin-adjusted returns), highlights significantly lower correlations among cryptoassets relative to correlations among the same coins in USD returns (avg. correlation declines from 0.67 to 0.20).
Although the average correlation among the top 30 coins is significantly lower in BTC returns than in USD returns, the dataset did yield several similarities between correlations when BTC returns were compared to USD returns.
The correlations of the same subset of coins (DOGE, WAVES, BSV, TRX, BNB) with other assets are once again relatively lower than the average correlation among the entire basket of cryptoassets. Consequently, it appears that the same baskets of assets, whether calculated in USD or BTC returns, displayed lower correlations than their peers.
Lastly, the existence of a Binance effect also appears in BTC returns correlations. Similar to observations from correlations in USD returns, Dogecoin (DOGE), MakerDao (MKR) and Tezos (XTZ) exhibit lower correlation than the average correlation among selected cryptoassets for this analysis.
In addition, PoW coins also exhibited stronger correlations among one another when using Bitcoin-adjusted returns, as was observed in the USD returns dataset.
2. Did stablecoins impact market structure?
Given cryptoassets exhibited lower correlations in BTC returns than in USD returns over the previous 90 days, the same findings were compared to the dataset during a 3-month period both one year before and six months before to understand how the macro environment may have affected correlations.
2.1 USD 3-month Snapshots
Chart 3 - Dec 1 2018 - Mar 1 2019 : Large-cap assets 3-month correlation matrix (USD)
Chart 4 - Dec 1 2017 - Mar 1 2018 : Large-cap assets 3-month correlation matrix (USD)
Comparison of the most recent 3-month correlation matrix with the same period one year prior highlights that USD returns have stronger correlations now than in the previous time period.
Excluding Dogecoin, the minimum correlation of the dataset was 0.648 (between Litecoin and NEM) between December 1st, 2018 and March 1st, 2019. In contrast, the same assets had an average correlation of 0.51 a year prior during the period between December 1st, 2017 and March 1st, 2018.
The extreme volatility in crypto markets from late 2017-early 2018 may have contributed to the weaker correlation amongst cryptoassets as a whole.
Chart 5 - Jun 1 2018 - Sep 1 2018: Large-cap assets 3-month correlation matrix (USD)
Once again Dogecoin (DOGE) had a lower correlation than the other assets whereas NEM’s average correlation with all assets spiked compared to six months prior.
NEM exhibited the lowest correlation with other coins between December 2017 and March 2018, prior to listing on Binance. A few months after being listed on Binance correlations subsequently rose, which underscores a potential “Binance Effect” as previously described. Yet, this single observation is not enough to state a general rule such as “assets not listed on Binance must necessarily exhibit lower correlations” and requires further investigation.
Although correlations among other cryptoassets were higher during this period, ETC's lower correlation may be partially explained by idiosyncratic factors such as becoming listed on Coinbase in August 2018.
2.2 BTC 3-Month Snapshots
Chart 6 - Dec 1 2018 - Mar 1 2019: Large-cap coins 3-month correlation matrix (BTC)
Chart 7 - Dec 1 2017 - Mar 1 2018: Large-cap coins 3-month correlation matrix (BTC)
Based on BTC returns, correlations from last quarter are much lower than one year prior. On average, the correlation among cryptoassets was 0.24 vs. 0.43 over the same period one year prior.
Chart 8 - Jun 1 2018 - Sep 1 2018: Large-cap assets 3-month correlation matrix (BTC)
Correlations during mid-2018 are lower than the previous period (Dec 2017 - Feb 2018), but higher than the most recent period (Dec 2018 - Feb 2019), highlighting a downward trend in overall correlations between cryptoassets.
2.3 Does the Rise of Stablecoins Explain Increased Correlations?
2018 was a bear market year as prices crumbled during the first half of the year and then decreased slowly until a bottom around December.
Chart 9 - 2018: Evolution of the total crypto market cap (USD bn)
While the bear market appears to be the most obvious explanation to the increase in cryptoasset correlations (using USD returns), the increased availability of stablecoin trading pairs and listings, as illustrated in our last report, has led to a material growth in proportion of stablecoin-enabled trading volume versus total cryptoasset trading volume. This could be another factor to consider in evaluating correlations from today’s cryptoasset markets.
Chart 10 - Increasing Volume: Contribution of Stablecoin Volume to Total Industry Volume
Only one year ago, stablecoin volume represented less than 10% of total cryptoasset trading volume (e.g. Binance had only 5 USDT trading pairs (BTCUSDT, ETHUSDT, BNBUSDT, NEOUSDT, & LTCUSDT) as of February 28th 2018).
Today, stablecoin volume represents more than 30% of the total volume in the cryptoasset industry and Binance has more than 100 stablecoin pairs with different quote currencies (e.g., USDT, USDC, PAX, TUSD, USDS).
During the peak of the bull market (mid-December 2017), speculators used BTC/ETH bought on fiat exchanges to deposit funds onto cryptocurrency exchanges such as Binance or Bittrex to trade immediately into altcoins.
Given these crypto-to-crypto exchanges contributed a large portion of total volume in the industry, most of the cryptoassets used in this correlation analysis were traded solely against BTC, which could explain why their BTC returns had stronger correlations in previous periods than in the most recent period (as many of these large cap assets are now also paired with stablecoins).
Prior to mid-2018, in order to buy/sell coins such as XMR, the highest volume trading pair was XMR/BTC. During large sell-offs or purchases of altcoins, they all exhibited similar price movements in BTC.
Today, cryptoasset trading pairs are no longer BTC-dominated. As of March 2019, most of the largest cryptoassets by market capitalization are now directly traded against stablecoins (USDT as the most popular).
For example, NEO was one of the first coins to be listed on Binance and was extremely popular in 2017.
Chart 11 - NEO trading volume on Binance - Feb 28 2018 vs. Feb 28 2019
As of February 28th, 2019, the contribution of the stablecoin pair volume to total Binance volume of NEO increased to 66%, compared to 45% a year ago, taking over the majority of ETH and BTC pair volumes.
NEO is not alone; in fact, most of the assets didn’t even have a stablecoin pair on Binance in April 2018. Today, a large majority of the top market capitalization coins do have a “stable counterparty”.
Table 1. Existence of stablecoin pairs on Binance
This trend is not confined to crypto-to-crypto exchanges like Binance - fiat exchanges have also started increasing the number of cryptoasset offerings on their platforms, thereby providing more direct fiat onramps and trading pairs for altcoins. As an example, Coinbase has 17 cryptoassets (and 38 corresponding pairs) as of March 1st, 2019 and continues to explore adding a variety of additional cryptoassets to the platform.
In summary, large market-cap cryptoassets exhibited high correlations in USD returns, and these correlations increased over the course of 2018. Conversely, crypto-asset correlations in BTC returns decreased over the same period.
While these changes in correlations coincided with the rise in stablecoin volume and stablecoin trading pair offerings across exchanges, the analysis reveals additional idiosyncratic factors that should be considered when constructing an optimal cryptoasset portfolio.
As this report primarily relied on large market-cap cryptoassets and their performance over a limited time horizon (15 months) that was predominantly a bear market, further analysis across longer time periods, small / medium market-cap assets and additional macro environments can be conducting to augment these findings.
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