What are the supported countries for buying cryptocurrency?

You can use Coindeck from almost any country in the world. The following is a list of countries that are NOT supported:

Afghanistan, Albania, Algeria, Angola, Bahrain, Bahamas, Bangladesh, Bolivia, Botswana, Barbados,  Brazil, Burundi, Burkina Faso, Cambodia, Cayman Islands, Colombia, Chad, Chile, China, Congo, Cuba, Curacao, Djibouti, El Salvador, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Germany, Ghana, Guam, Haiti, Indonesia, Iran, Iraq, Jamaica, Jordan, Kenya, Korea, Kuwait, Democratic Republic of (North Korea), Laos, Lebanon, Liberia, Libya, Malawi, Malaysia, Mali, Mauritania, Mauritius, Mexico, Myanmar/Burma, Morocco, Mozambique, Nicaragua, Niger, Nigeria, Northern Mariana Islands Occupied Palestine Territories, Oman, Pakistan, Panama, Philippines, Puerto Rico Qatar, Rwanda, Saudi Arabia, Senegal, Sierra Leone, Solomon Islands, Somalia, South Sudan, Sri Lanka, Sudan, Suriname, Syria, Timor Leste, Togo, Trinidad & Tobago, Tunisia, United Arab Emirates, Uganda, Uruguay, USA, US Virgin Islands, Vanuato, Venezuela, Vietnam, Yemen, Zimbabwe.