"Government of India does not appoint any authorized agents to apply for e-Visa on behalf of any applicant. Do not fall prey to such fake e-Visa portals claiming to provide Express e-Visa services by charging a hefty amount for same. The official website of Government of India for e-Visa and related visa services is www.indianvisaonline.gov.in " (Niraj Sharan, Asst Director General , Ministry of Tourism, Delhi)
Should you do a Google search for e-Visa online you will find many of these unauthorized portals - please beware.
Further it needs to be understood that many tourists assume that Indian Visa is arranged on arrival in India and make arrangements to travel. They then turn up at the airport where they will be denied boarding until they secure a visa BEFORE they travel.
You are advised to visit this site and apply for e-Visa and print the confirmation which normally comes with in 48/78hrs and bring this along to board the flight. A valid Passport for more than 6 months, air ticket and e-Visa confirmation is must to board a flight to India.