And minor parties receive funding from the Australian Electoral Commission if they receive over certain percentage of votes.
It was 5% last time I cared to be informed by may be different now, and they would receive $x for each vote, or what ever it is now.
Currently minimum 4% of formal first preference votes, which gets you $3.499 per a first preference vote (indexed to inflation every six months)
Then you automatically get paid the first $12,791, and the rest of the funding is by reimbursement of substantiated election expenses.
This is per a candidate (lower house) or per a group (upper house). And this is just federal elections - state election funding is up to each state, but I believe the states have broadly similar funding systems.
https://www.aec.gov.au/parties_and_representatives/public_fu...
https://www.aec.gov.au/Parties_and_Representatives/public_fu...
Note the US also has public financing for presidential campaigns, which is available to minor parties once they get 5% or more of the vote. But in the 2024 election, Jill Stein (Green Party) came third on 0.56% of the popular vote. The only third party to ever qualify for general election public funding was the Reform Party due to Ross Perot getting 18.9% in the 1992 election and 8.4% in the 1996 election. There is also FEC funding for primary campaigns, and I believe that’s easier for third parties to access, but also less impactful.