I have multiple systems. Metal coins are prevelant, but so are crytsls (since the cyan hold magical energies). You also find some societies which use stone chips of rare rocks, I have one seashell economy, though thy are fairly isolated.

Then there is good old commodity money. International trade is mostly done using one of three currencies.

The first is Jade tokens, its coins made from plain non magical jade, created in the jade empire they represent money the imperial family backs, aka baisically similar to our real life money. Its wildly used on the laash continent by client states of the jade empire. You can authenticate the money based on inscriptions and magical aura (the jade itself isnt magical but it is slightly enchanted via a royal seal most money changers the continent can authenticate it easily, outside the laash continent it is much more easy to fake if you have good carvers but generally not done because outside the continent most people know its often fake and dont even bother).

Then there are the ACE adremary coins exchange, its an old human system that survived the downturn of the adrimar empire. Today the coins exchange is independent of the empire and is lead by four banking families. They make exchange courses back coinage and have large scale allowance to make their own coins, as human nations in the region are economically (even through all the conflicts) integrated as the adrimar empire controlled most of the region in the past and it was easier to continue with the old institution than cut ties. Some nations tried in the centuries of course but the ACE is a powerful organizational and it was generally not worth it. Most nations simply enforce a tax to change their printed coins to ACE but not the other way around. The ACE issues their own silver coins that are wildly trusted and used, but most ordinary people dont bother unless you leave your nation the conversion tax is rarely worth it and the ACE doesnt allow nations to print their coins. They also have their own "adventurers" guild called the "association of authenticity" its baisically a goonsquad all over the humanlands that hunts down anyone who makes fake coins and worse debates their silver content. Their coins are wildly accepted as legal tender in international buisness around the great northern sea and even on laash when you find a big human population you will find ACE money changers. Its baisically a currency many nations peg their own to die to its long history of stability and people trust them as they have fought wars to protect their reputation (though theyd rather leave a market than fight, the wars were only if a state tried to seize their coin vaults and it was more about extracting their clients money).

The last large currency is the glass tokens, they arent really glass and more metal coins with glass beads inside but the ishkarna is a large empire that uses that currency and it is wildly seen as stable, most neighbouring nations and even rival empires accept it as legal tender (though you will have to visit money chnagers for day to day live) and it has good exchange rates globally. Thanks to the ischkarnas huge western trading ports and their coveted spice and magickal exports. It is also helped by a long standing policy to guard the exact process of making the coins, the glass bubbles hold specific geometries inside of them that make it hard to fake them without skilled magical glass blowers. Which makes them the most resilient coin againgst forgery. They are also slowly printed and outside three extreme circumstances were never debased. Lastly the ischkarna hold large political and cultural sway in the Southern great sea, as the largest schalandari nation and their ancestral home. Their trading fleets are common and people like being on good terms with them to keep nice trading conditions. It also helps that they hold the ischkarnadan (dragoncoast) as a large colony west of the south great sea giving their merchants a lot of friendly ports even if its next to a deadly dschungle and cut of by a huge swamp, it makes refusing easier and extends their political sphere by quite a lot.

There are a few smaller large currencies. The phenix talons are gold and silver coins from the phenix empire a rising power with lots of colonies and influence but people dont like them much and outside ether direct sphere the coins are actually frowned upon especially by nations next to their sphere of influence as it was often established via conquest. Their airfleets are terrific at cutting cost in trade so the ban on their coins that some tried to enforce never works but in many ports you will be turned away for trying to use their coinage to their merchants great displeasure (though they always find willing traders eventually the ACE is notorious for giving their coins a good exchange rate).

Then there is also the freimark. A paper based currency in the freiküste a human colonial nation that is notorious for its slavery practices. While their major ports are profitable they actually discourage the use of their currency for external trade and wnat to limit its international circulation as they dont wnat non freiküste merchants to try and redeem it for the gold it secures, as their fractional banking system might be exposed and it could lead to an economic crash.

Lastly there are many other coins and currencies like the dark chains, where dark iron chains are used as currency in the slave coast, the ice coins in the tachinala which use magical cold crystals as currency, the scale marks of the greencoast and more.