Every quarter, FTX will consider rebalancing its index futures.
We will announce all rebalances at least a day in advance.
Index rebalances will happen over the course of 1 hour. Every 10 seconds we compute a new set of weights, such that at time t
the number of tokens of coin
in the index is weight_t(coin) = x_t * ((1 - t / (1 hour)) * weight_original(coin) + t / (1 hour) * weight_target(coin))
, where the scaling factor x_t
is chosen such that the index price computed using weight_t
is equal to the index price computed using weight_{t - 10 seconds}
.
This will insure that index does not gain or lose value as a consequence of the rebalance.
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