According to the government statement, the State of Qatar's authorities have introduced a visa-on-arrival system for nationals of 37 countries, starting immediately  from 21 June 2017. According to the statement, visas will be granted with 100 QAR ($27) change fee subject to the following conditions: 
1. passport validity must not be less than 6 months; 
2. customer must have a return onward ticket; 
3. customer must have hotel booking confirmation and money equivalent to $1,500 or a credit card. 
The list of countries includes Argentina, Chile, French Guiana, Latvia, Macedonia, Paraguay, Slovakia, Lebanon, Bolivia, China, Ecuador, Guyana, Seychelles, Malta, Peru, Slovenia, Thailand, Brazil, Colombia, Estonia, Indonesia, Lithuania, Mexico, Romania, South Africa, Uruguay, Bulgaria, Croatia Falk Islands, Kazakhstan, Macau, Moldova, Russia, Suriname and Venezuela. 
In addition to that Indian nationals who carry the official residence document of UK or the USA green card would also be granted the same visa. Therefore the number of countries whose nationals are entitled to enter the State of Qatar in this way amounts to 72 countries.