Just got response from Graviex team (waiting for about 2 weeks):
Quote
Hello! We regret to inform that your application form has been rejected. However, you may take part in voting for listing if having filled this form https://graviex.net/listing_requests/new. When your coin collects at least 3 000 000 (there is about 0.3 BTC) votes in GIO and will take one of the three top positions, the coin will be listed on Graviex. The winners will be defined 2 times a week: on Tuesday and Friday. Any person having GIO coin can vote. There are 2 ways to acquire GIO: 1. To purchase GIO on https://graviex.net/markets/giobtc 2. via mining on http://miningpool.gravio.net/. The results of voting are displayed here https://graviex.net/listing_registers