Thomson Reuters Coinbase announced Tuesday that they will launch an index fund product. The fund will allow accredited investors to invest in a basket of cryptocurrencies listed on GDAX, Coinbase's exchange. Coinbase, the cryptocurrency trading platform, announced Tuesday the launch of an index fund which will allow investors to put money into a basket of four of the largest cryptocurrencies. The so-called Coinbase Index Fund will give investors access to the digital currencies listed on GDAX, the exchange operated by Coinbase.