diff --git a/mods/vendor-values-classicapi.lua b/mods/vendor-values-classicapi.lua
new file mode 100644
index 0000000..5491367
--- /dev/null
+++ b/mods/vendor-values-classicapi.lua
@@ -0,0 +1,32 @@
+local API = ShaguTweaks.API
+
+-- Keep the original static database as an immediate compatibility fallback.
+-- ClassicAPI's live item cache is authoritative when it has the item record,
+-- which also covers Turtle/custom items and server-side price changes.
+if not API or not API.itemprice or not ShaguTweaks.SellValueDB then return end
+
+local legacy = ShaguTweaks.SellValueDB
+local live = {}
+
+setmetatable(live, {
+  __index = function(tab, itemID)
+    if type(itemID) ~= "number" then
+      return legacy[itemID]
+    end
+
+    local price = API.GetItemSellPriceByID(itemID)
+    if price ~= nil then
+      -- Vendor values don't change during a session. Cache successful reads so
+      -- the tooltip's repeated lookups stay pure Lua after the first hit.
+      rawset(tab, itemID, price)
+      return price
+    end
+
+    -- An uncached item is warmed by ClassicAPI in the background. Use the old
+    -- database now; a later tooltip lookup will transparently pick up live data.
+    return legacy[itemID]
+  end
+})
+
+ShaguTweaks.SellValueLegacyDB = legacy
+ShaguTweaks.SellValueDB = live