This Finpip overview summarizes Rakuten Securities Australia as commonly marketed to retail traders (founded 2015; HQ: Sydney, Australia). Typical platforms include Rakuten FX platform, MetaTrader 4.
Regulatory snapshot (not legal advice): ASIC; part of Rakuten group; Australia-focused retail FX
Official website: https://www.rakuten.com.au/sec/. Confirm licence numbers, product availability, and costs there before funding an account.