Had fun designing obscure production chains to feed Hex Cores for money and carting items around for infinite loops. Now I landed on Aquilo and one of the Hex Cores right next to the starter Core has 2 trades that create infinite money without needing any production or logistics.
A: 7 Ice >> 399k Coins
B: 623k Coins >> 11 Ice
With a little bit of trade productivity from Quests and stars, Coins just go up after putting in an initial stack of ice.

There should probably be a check added, so a single Hex Core can't have a trade loop in itself.

Edit: playing a bit longer and looking at the pricecs of Core upgrades and stuff on Aquilo, I think that infinite money loop is less of an issue then initially thaught. However, any money-making loops on other planets are instantly obsolete when on Aquilo.

Yes, the step up in coin production on Aquilo vs other planets is intentional. It's also intentional from Nauvis to the other planets. But the single-core loop isn't. It's quite rare to see that on most planets, but more common on Aquilo due to how few items are initially tradable on it.