There is only one official ESTA website and that is https://esta.cbp.dhs.gov.
The ESTA application fee is $14 per application. Third-party companies who are charging a fee to assist travelers in registering under ESTA are NOT operating on behalf of the U.S. government. This Electronic Travel Authorization is valid for 2 years.
If you are a citizen of a Visa Waiver Program partner but have received notice that you are no longer eligible to travel to the United States under that program, you should apply for a nonimmigrant visa at least three months in advance of your desired travel. If you do not have imminent travel plans, you should pay the nonimmigrant visa application fee, fill out the DS-160 nonimmigrant visa application form at ceac.state.gov/genniv/, and schedule a visa appointment. If your travel is imminent, you may request an expedited visa appointment. Please include in your request the date and purpose of your travel, as well as a copy of the U.S. Customs and Border Protection message you received regarding your ESTA status.
The Visa Waiver Program (VWP) allows nationals of designated member participants to travel to the United States for tourism or business (B visa category) purposes for up to 90 days without obtaining a visa.
On February 28, 2014, Chile was designated as a member of the Visa Waiver Program. Beginning March 31, 2014, Chilean nationals may travel to the United States under the program.
If you have questions related to ESTA, you should contact U.S. Customs and Border Protection (CBP)
ESTA hotline (202) 344-3710
(202) 325-8000; (877) 227-5511