BitMEX Basket Indices track the performance of a basket of selected coins or tokens. The Basket Index price is calculated as the Index Multiplier weighted average price of the constituents and provides traders with a thematic exposure, such as the top Altcoins, while diversifying exposure into multiple underlyings.

The constituents and Index Multiplier are reviewed and updated on a quarterly basis, a “rebalance”. Changes will be announced on the BitMEX website, on the BitMEX blog and via the BitMEX RSS feed, with 1 week’s notice before implementation.

Calculation of the Basket Index Price

The Basket Index Price is equal to a sum of the individual constituent prices weighted by Index Multipliers that are calculated so that :

1. At the time of initial index listing the index price is equal to 100.
2. At the time of rebalance the Index Multipliers of each individual constituent are set such that the Index Price calculated using the old Index Multipliers and the new Index Multipliers are the same.

The Basket Index price uses index prices of individual constituents and is calculated and published every 5 seconds. See Indices for details in respect of the underlying indices.

BitMEX Basket Indices

BitMEX ALTMEX Basket Index

The BitMEX ALTMEX Basket Index tracks the performance of a basket of altcoins selected based on their market capitalisation in USD. When the market capitalisation analysis is performed, a cap of 20% is applied to the market capitalisation of each individual coin in the basket. Currently the target number of constituents for the BitMEX ALTMEX Basket Index is 10. Adverse market events may cause a reduction in the number of constituents and the target may be updated for future index rebalances.

The Constituents and Conditional Index Multipliers of BitMEX ALTMEX Basket Index are shown below, last updated on 13 July 2021. The Conditional Index Multipliers below are calculated using market capitalisation analysis performed on 6 July 2021. At initial index listing the Index Multipliers are scaled based on the Conditional Index Multiplier to ensure the initial index price is 100. When the Index is rebalanced, the Index Multipliers are based on the Conditional Index Multipliers and are scaled to ensure that the index Price has the same value as with the previous Index Multipliers. Please refer to the index page for the actual Index Multipliers.

Constituent	Conditional Index Multiplier	Market Cap Share
BNB	0.067467	20.00%
ADA	14.199504	20.00%
DOGE	62.482730	15.01%
XRP	22.128239	14.87%
DOT	0.459176	7.10%
UNI	0.281648	5.68%
BCH	0.008962	4.61%
LTC	0.032021	4.48%
SOL	0.130704	4.36%
LINK	0.209549	3.89%

BitMEX DEFIMEX Basket Index

The BitMEX DEFIMEX Basket Index tracks the performance of a basket of altcoins selected based on their market capitalisation in USD. When the market capitalisation analysis is performed, a cap of 20% is applied to the market capitalisation of each individual coin in the basket. Currently the target number of constituents for the BitMEX DEFIMEX Basket Index is 10. Adverse market events may cause a reduction in the number of constituents and the target may be updated for future index rebalances.

The Constituents and Conditional Index Multipliers of BitMEX DEFIMEX Basket Index are shown below, last updated on 13 July 2021. The Conditional Index Multipliers below are calculated using market capitalisation analysis performed on 6 July 2021. At initial index listing the Index Multipliers are scaled based on the Conditional Index Multiplier to ensure the initial index price is 100. When the Index is rebalanced, the Index Multipliers are based on the Conditional Index Multipliers and are scaled to ensure that the index Price has the same value as with the previous Index Multipliers. Please refer to the index page for the actual Index Multipliers.

Constituent	Conditional Index Multiplier	Market Cap Share
UNI	6.706274	20.00%
LINK	7.295620	20.00%
AAVE	0.303871	12.13%
MKR	0.023165	9.40%
LUNA	9.898960	8.39%
COMP	0.126045	8.11%
AVAX	4.079088	7.26%
GRT	68.556206	7.18%
YFI	0.000681	4.14%
SUSHI	3.010090	3.39%

Rebalance Schedule

The Index Multipliers for BitMEX Basket indices are rebalanced and updated on the last Friday of each calendar quarter, and the Conditional Index Multiplier will be announced 7 days before the rebalance. The market capitalisation analysis is conducted 4 days before the announcement.

For example, at 12:00:05 UTC on 24 September 2021, BitMEX will perform a rebalance of Basket indices. The new Conditional Index Multiplier and changes in constituents will be announced on 17 September 2021 and will be based on constituents’ market capitalisation data on 13 September 2021.

Example Index Calculation for .BALTMEX Index

Constituent	Last Price	Index Multiplier	Last Price x Index Multiplier
BNB	299.38	0.07009629	20.9854276
ADA	1.417482	14.75288016	20.9119421
DOGE	0.24201	64.91777654	15.7107511
XRP	0.67375	22.99060996	15.4899235
DOT	15.4098	0.47707078	7.3515654
UNI	20.278	0.29262425	5.9338345
BCH	515.11	0.00931126	4.7963245
LTC	140.145	0.03326891	4.6624709
SOL	33.986	0.13579773	4.6152217
LINK	18.6495	0.21771544	4.0602841

The sum of Last Price x Index Multiplier was 104.51774549. So the .BALTMEX price was 104.517745 (rounded to the nearest 6 decimals).

Special Rebalances

BitMEX may decide, in its sole discretion, to rebalance the Index Multiplier of the Basket Index, for example (without limitation) due to the occurrence of a market disruption event (such as inaccuracy, unreliability or unavailability of one or more data sources, or otherwise unusual or extreme market conditions) or regulatory concerns regarding any constituent, and/or our intention to ensure an orderly market.

In this case, we will endeavour to communicate the change in constituents’ Index Multiplier at least 1 day in advance (but reserve the right to make adjustments with less, or no, notice, where we consider such adjustments to be necessary or desirable).