The Antiques Dealer
Exchange your items! Select unwanted items from your inventory and offer them to the Antiques Dealer in exchange for Trade Coins that you can use within his shop. Exchanging valuable items will also provide you with the chance to get rare Gemstones. The longer the exchange takes, the more currency you will receive from your items.
Shop for a bargain! All items within the shop will cost Trade Coins to purchase, but some more valuable rewards will also cost Gemstones in addition. Each item can only be purchased once until the shop has been refreshed. Make sure to keep checking back regularly as new items will keep being added to the shop.
Sold to the highest bidder! Periodically, the Antiques Dealer will also sell rare and exclusive items, but only to the highest bidder. Bids can be made with Trade Chips only, if another player outbids you, all of your Trade Coins will be returned to you immediately. The player with the highest bid at the end of the auction wins the item.
The Merchant (only available with some settlements)
Offers & Negotiation. The merchant will allow you to get additional goods for your current cultural settlement. To obtain them, you will have to negotiate for them by using goods from your main city.
Daily Offers. Once per day you get the chance to see new offers. Every empty slot will get a new, random offer once the 24 hour timer is up. In case you don't like an offer, you can dismiss it to potentially get something better the next day.
Future Settlements. Whenever you start a new settlement, you will have to unlock the merchant anew by solving a specific quest. Keep in mind that not every culture will have the merchant available.