FiveM is extensively modifiable and mods can be uploaded via FTP. More information can be found here: https://zap-hosting.com/guides/docs/en/fivem_installresources/ 2. Information about FiveM modding can be found on the official FiveM site: https://docs.fivem.net/docs/scripting-manual/ 3. The costs depend on the chosen server configuration, for example the chosen number of slots or the location In the standard configuration a FiveM server costs 4,90€ per month, if the German VAT of 19% has to be paid. 4. The standard configuration includes 10 slots (maximum number of players on the server), 1 GB RAM, server location: Germany, DDoS protection, administration via web interface.