Trading Post

The Trading Post is where a travelling NPC trader buys and sells goods at fluctuating prices — a genuine two-way market, not just somewhere to vendor surplus. It is unlocked by purchasing rank 1 of the Trader's Charter in the Shop; each further Charter rank adds +25% to the post's daily stock and demand, and the Grand Bazaar Pass from the Exotic Broker adds more on top.

How it works

The trader posts fresh quotes each market day (every 6 hours of game time) — an independent random price roll for every tradeable good, shown on the Trading Post screen as Surplus (cheap), Steady, or In demand (expensive).
Each good's quote sets what he pays if you sell to him — above the item's plain vendor sell value, so selling to the trader always beats vendoring from the Bank — and what he charges if you buy from him: that same quote plus a flat 25% markup.
Buying isn't just a curiosity: it's a way to stock up for a special order below, and for three endgame gems — Deep Sapphire, Ember Topaz, and Abyssal Amber — trading is their only use at all, since nothing else in the game consumes them. Pick a good up on a cheap Surplus day and sell it back once the quote turns In demand for a real profit.
Every good has a limited daily demand (how much the trader will buy from you) and stock (how much he'll sell you); the two are currently set to the same number for every good, shown as "Daily demand" in the table below. Higher-value, later-tier goods have smaller quantities and tighter price bands, so premium goods swing less and run out sooner than early goods. Both figures grow with Trader's Charter ranks and the Exotic Broker's Grand Bazaar Pass — fully upgraded, daily stock and demand triple.
Prices are bounded against exploits on both sides: what he charges to buy always stays above the item's plain vendor value, so buying from him and immediately vendoring it is always a loss; and what he pays to sell never rises high enough that buying the same good at the Shop and reselling it to him would turn a profit.
Every trade — buying or selling, including special orders below — also progresses the Trade Writ Contracts.

Tradeable goods

Goods range from early-game crops and materials to endgame gems. Earlier goods have wider price bands and deeper demand; later goods have narrow bands and shallow demand.

Good	Tier	Price band (× base)	Daily demand
Gourd	Early	1.2–3.0	100
Raw Meat	Early	1.2–3.0	100
Sunroot	Early	1.2–3.0	80
Hide	Early	1.2–3.0	80
Bristle Corn	Early	1.2–3.0	75
Marshmelon	Early	1.2–3.0	60
Flamegrain	Mid	1.2–2.8	45
Iron Ore	Mid	1.2–2.8	45
Redwood Log	Mid	1.2–2.8	36
Thornvine Berry	Mid	1.2–2.8	50
Ambervine	Mid	1.2–2.8	38
Cloudbean	Mid	1.2–2.8	30
Duskroot	Mid	1.2–2.8	26
Amber Resin	Mid-late	1.2–2.6	24
Frostgourd	Mid-late	1.2–2.6	24
Echo Shard	Mid-late	1.2–2.6	20
Emberling Pumpkin	Mid-late	1.2–2.6	18
Skyfruit	Mid-late	1.2–2.6	16
Primal Squash	Mid-late	1.2–2.6	12
Vale Heartfruit	Mid-late	1.2–2.6	10
Starfall Melon	Mid-late	1.2–2.6	8
Moonstone	Late	1.2–2.4	12
Deep Sapphire	Late	1.2–2.4	10
Ember Topaz	Late	1.2–2.4	8
Sky Opal	Endgame	1.2–2.2	6
Abyssal Amber	Endgame	1.2–2.2	4

The price band shows the full range the day's quote can land in for a good — the low end is roughly a Surplus day, the high end roughly In demand. That same quote sets both what he pays you to sell and (plus his 25% markup) what he charges you to buy; it re-rolls independently for each good every market day. Demand above is also each good's daily stock (buy) cap, since the two are currently identical for every good.

Special orders

From Trader's Charter rank 2, the post also posts a rotating special order each market day — a guaranteed bulk delivery at a fixed multiplier (up to 3.0× sell value) that doesn't draw on the good's daily demand, so it stacks on top of ordinary selling. For higher-tier goods that fixed multiplier beats even the top of the good's usual price band; for early goods it mainly guarantees the top of the band on demand, without waiting for a lucky market day. There are 16 orders in the rotation, unlocked in three pools by Charter rank — common goods at rank 2, mid-tier goods at rank 3, gems at rank 4; the Broker's Book (Exotic Broker) and the Trader's Seal relic add extra concurrent order slots.

Order	Charter rank	Quantity	Payout multiplier
Raw Meat	2	50	2.6×
Sunroot	2	45	2.6×
Hide	2	40	2.6×
Marshmelon	2	35	2.6×
Iron Ore	2	35	2.8×
Redwood Log	2	30	2.8×
Cloudbean	3	25	2.8×
Amber Resin	3	18	3.0×
Frostgourd	3	18	3.0×
Echo Shard	3	15	3.0×
Skyfruit	3	12	3.0×
Primal Squash	3	10	3.0×
Moonstone	4	10	3.0×
Deep Sapphire	4	8	3.0×
Ember Topaz	4	10	2.8×
Sky Opal	4	6	2.8×

Related pages

Shop — the Trader's Charter unlocks and upgrades the post
Exotic Broker — the Grand Bazaar Pass and Broker's Book upgrade it further
Bank — where goods are vendored instead, and where bought goods land
Crops — a large share of tradeable goods are farmed crops
Items — materials and gems traded at the post
Trader's Seal — a quest relic that adds a special-order slot
Contracts — the Trade Writ tracks goods traded here
Amber — spent buying goods, earned selling them