GR.com Domain Names Registry follows Centralnic's Dispute Resolution Process through WIPO
WIPO has set the following pricing structure for their services :
You can read the pricing structure below or use the direct link to Centralnic.com page here :
https://www.centralnic.com/support/dispute/wipo-prices

The following schedule of fees applies in connection with any domain name administrative proceeding that is to be administered by the WIPO Arbitration and Mediation Centre.

The fee consists of an amount to be retained by the centre as an administration fee and an amount to be paid to a panellist.

In the event of the withdrawal of a complaint or the termination of an administrative proceeding prior to the appointment of an administrative panel, for cases involving up to 10 domain names the centre shall withhold a processing fee in the amount of the centre's share of the total fee; for cases involving more than 10 domain names the centre shall determine in its sole discretion the processing fee to be withheld by the centre, subject to a minimum of US$ 700 for single member panel complaints and US$ 1250 for three member panel complaints. In the event of the termination of an administrative proceeding after the appointment of an administrative panel, the Centre shall determine in its sole discretion whether any amount of fee paid by either party shall be refunded.