The exact ranking of XRP in 2015 can vary depending on the specific date you're looking at. However, it was consistently among the top 10 cryptocurrencies by market capitalization throughout the year.
Here's a snapshot of the top cryptocurrencies by market cap on September 6, 2015:
* Bitcoin (BTC)
* XRP (XRP)
* Litecoin (LTC)
* Ethereum (ETH)
* DASH (DASH)
Please note that the cryptocurrency market is highly dynamic, and rankings can change rapidly over time.
