The index is weighed to 10,000 on the 1st of September, 2018.
The formula used should be the same as the one found in BGCI, with the result being the product of all individual market caps to the power of their own cap that is divided by the sum of all caps.
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XRP: rEb8TK3gBgk5auZkwc6sHnwrGVJH8DuaLh | 106703134
BTC - 36GUCF9CAzrtgkXs199NELscFcc8bnchE1
XRP - rf5rHXUAgdUh3YbgaqeW8VWfoRwnTXNN48