You can pay with Bitcoin. You will pay either $20 USD or $40 USD equivalent in Bitcoin. Danbooru uses Coinbase as a payment intermediary so none of your personal information will be stored on the site.

<% if user.level < User::Levels::GOLD %> <%= raw coinbase.create_button("Upgrade to Gold", 20.to_money("USD"), "Upgrade your Basic Account to a Gold Account", encrypt_custom(User::Levels::GOLD), :button => {:style => "custom_small", :text => "Upgrade to Gold", :callback_url => user_upgrade_path(:only_path => false, :host => Danbooru.config.hostname, :protocol => "https")}).embed_html %> <%= raw coinbase.create_button("Upgrade to Platinum", 40.to_money("USD"), "Upgrade your Basic Account to a Platinum Account", encrypt_custom(User::Levels::PLATINUM), :button => {:style => "custom_small", :text => "Upgrade to Platinum", :callback_url => user_upgrade_path(:only_path => false, :host => Danbooru.config.hostname, :protocol => "https")}).embed_html %> <% elsif user.level < User::Levels::PLATINUM %> <%= raw coinbase.create_button("Upgrade to Platinum", 20.to_money("USD"), "Upgrade your Gold Account to a Platinum Account", encrypt_custom(User::Levels::PLATINUM), :button => {:style => "custom_small", :text => "Upgrade to Platinum", :callback_url => user_upgrade_path(:only_path => false, :host => Danbooru.config.hostname, :protocol => "https")}).embed_html %> <% end %>