There are more than 5000 cryptocurrencies in the world but I am going to shortlist the Top 10 Cryptocurrency 2017 according to market cap, demand, future scope and value investment asset.
#1 Bitcoin
As expected, the Bitcoin is in the top of the list with a market capitalization of $29,919,930,192. It was invented by Satoshi Nakamoto at the time, it was the only virtual currency available in the market. You can buy 1 BTCUSD Bitcoin US Dollar by paying $1832 (12 May 2017) as its the costliest virtual currency in the market accepted and legalized in many countries. See the countries where bitcoin is legal and also countries where bitcoin is illegal.
If you don’t have $1800 don’t worry, investors can also buy satoshi which is the smallest part of bitcoin.
The Bitcoin miners are the key to Bitcoin security and miners are responsible for the creation of new bitcoins. But keeping you Bitcoin safe is the most important thing to do after buying bitcoin. You should also learn about our 2017 Bitcoin Price Forecast.
#2 Ethereum
A platform built for smart contracts that is controversial due to its recent hard fork which resulted in diverging blockchains. The market cap of Ethereum is $8,284,240,957 with a price of around 90 US Dollars.
#3 Ripple
Ripple is a real time gross settlement system network by ripple. It was introduced in the year 2012 and has a market cap of $7,236,937,220. You can buy one unit with a price of around $0.18.
#4 Litecoin
It’s also an open source pear-to-pear digital currency same like Bitcoin. The market cap of Litecoin is $1,576,960,281 with a value of around $30.89 for 1 Litecoin.
#5 Monero
Monero is an open-source virtual currency introduced in April 2014 that focuses on privacy and decentralization. Moreover, the market cap of Monero is $425,834,896 with a value of around 29.48 US Dollar for a unit.
#6 Ethereum Classic
Although it as not so famous but it has a market cap of $575,782,074 and value of approximately $6.58.
#7 Dash
Dash, formerly known as Xcoin and Darkcoin and is open peer-to-peer virtual currency. It was introduced 3 years ago and have a market cap of around $664,377,178.
#8 MaidSafeCoin
The cryptocurrency with a market cap of $148,897,399 and price of around $0.322 per unit.
#9 Augur
The Augur has a market cap of $188,505,585 with the value of $17.15.
#10 NEM
Though NEM is last in the list but it is performing well. Moreover, it was launched on March 31, 2015, and runs in Java platform. The market cap of NEM is $1,031,274,000.
Where does that leave steem, steem is still a new currency with a lot of potentials, so the best steemians can do is to be patient, steem is going to power up very soon to the rank of bitcoin and ethereum, although that could take some years
As of today
The value of Steem for today is $1.58282107. It has a current circulating supply of 237 Million coins and a total volume exchanged of $3,469,873.5 
Courtesy of
https://atozforex.com/news/top-10-cryptocurrency-2017/