How much does a Coinbase listing cost?

I'm curious to know, just how much does it cost for a cryptocurrency to be listed on Coinbase? I understand that Coinbase is one of the most reputable and widely-used platforms in the crypto space, so I'm sure there's a significant demand for their listing services. Is there a standard fee structure, or does it vary depending on factors like the coin's market capitalization, trading volume, or any other metrics? I'd appreciate any insights you might have on this topic.