diff --git a/src/calculateTreePrices.ts b/src/calculateTreePrices.ts
index 00950cf..0ab6a3c 100755
--- a/src/calculateTreePrices.ts
+++ b/src/calculateTreePrices.ts
@@ -4,15 +4,18 @@ import { CURRENCY_DECISION_PRICES } from './static/currencyDecisionPrices'
 // Update the tree prices
 export function calculateTreePrices(
   tree: RecipeTreeWithCraftFlags,
-  itemPrices: Record<string, number>
+  itemPrices: Record<string, number>,
+  customCurrencyPrices?: Record<string, number>
 ): RecipeTreeWithCraftFlags
 export function calculateTreePrices(
   tree: RecipeTreeWithQuantity,
-  itemPrices: Record<string, number>
+  itemPrices: Record<string, number>,
+  customCurrencyPrices?: Record<string, number>
 ): RecipeTreeWithPrices
 export function calculateTreePrices(
   tree: RecipeTreeWithQuantity | RecipeTreeWithCraftFlags,
-  itemPrices: Record<string, number>
+  itemPrices: Record<string, number>,
+  customCurrencyPrices: Record<string, number> = {}
 ): RecipeTreeWithPrices | RecipeTreeWithCraftFlags {
   // Calculate the buy prices
   let buyPriceEach = itemPrices[tree.id] || false
@@ -26,7 +29,11 @@ export function calculateTreePrices(
   // Calculate the base decision price (may be overwritten later with the craft price)
   let decisionPriceEach = buyPriceEach || undefined
   if (tree.type === 'Currency') {
-    decisionPriceEach = CURRENCY_DECISION_PRICES[tree.id]
+    if (customCurrencyPrices && typeof customCurrencyPrices[tree.id] === 'number') {
+      decisionPriceEach = customCurrencyPrices[tree.id]
+    } else {
+      decisionPriceEach = CURRENCY_DECISION_PRICES[tree.id]
+    }
   }
   let decisionPrice = decisionPriceEach ? tree.usedQuantity * decisionPriceEach : false
 
@@ -43,7 +50,9 @@ export function calculateTreePrices(
   }
 
   // Calculate the tree prices traversal for the sub-components
-  const components = tree.components.map((component) => calculateTreePrices(component, itemPrices))
+  const components = tree.components.map((component) =>
+    calculateTreePrices(component, itemPrices, customCurrencyPrices)
+  )
 
   // Calculate the craft price out of the best prices
   const craftDecisionPrice = components.map((c) => c.decisionPrice || 0).reduce((a, b) => a + b, 0)
diff --git a/src/cheapestTree.ts b/src/cheapestTree.ts
index 9a24915..01bc49c 100755
--- a/src/cheapestTree.ts
+++ b/src/cheapestTree.ts
@@ -19,7 +19,8 @@ export function cheapestTree(
     '102306': '0',
     '102205': '0',
     '103049': '0',
-  }
+  },
+  customCurrencyPrices: Record<string, number> = {}
 ): RecipeTreeWithCraftFlags {
   tree = applyEfficiencyTiersToTree(tree, userEfficiencyTiers)
   if (valueOwnItems) {
@@ -30,7 +31,8 @@ export function cheapestTree(
     )
     const treeWithPriceWithoutAvailableItems = calculateTreePrices(
       treeWithQuantityWithoutAvailableItems,
-      itemPrices
+      itemPrices,
+      customCurrencyPrices
     )
 
     const cheaperToBuyItemIds = getCheaperToBuyItemIds(treeWithPriceWithoutAvailableItems)
@@ -43,7 +45,7 @@ export function cheapestTree(
   const treeWithQuantity = calculateTreeQuantity(amount, tree as RecipeTree, availableItems)
 
   // Set the initial craft flags based on the subtree prices
-  const treeWithPrices = calculateTreePrices(treeWithQuantity, itemPrices)
+  const treeWithPrices = calculateTreePrices(treeWithQuantity, itemPrices, customCurrencyPrices)
   let treeWithCraftFlags = calculateTreeCraftFlags(treeWithPrices, forceBuyItems)
 
   // Force the root to be crafted
@@ -58,7 +60,7 @@ export function cheapestTree(
   )
 
   // Recalculate the correct tree price
-  return calculateTreePrices(treeWithQuantityPostFlags, itemPrices)
+  return calculateTreePrices(treeWithQuantityPostFlags, itemPrices, customCurrencyPrices)
 }
 
 function getCheaperToBuyItemIds(
diff --git a/src/updateTree.ts b/src/updateTree.ts
index 254b747..b4e7211 100755
--- a/src/updateTree.ts
+++ b/src/updateTree.ts
@@ -6,11 +6,12 @@ export function updateTree(
   amount: number,
   tree: RecipeTreeWithCraftFlags,
   itemPrices: Record<string, number>,
-  availableItems: Record<string, number> = {}
+  availableItems: Record<string, number> = {},
+  customCurrencyPrices: Record<string, number> = {}
 ) {
   // Update the tree total and used quantities
   const treeWithQuantity = calculateTreeQuantity(amount, tree, availableItems)
 
   // Recalculate the correct tree price
-  return calculateTreePrices(treeWithQuantity, itemPrices)
+  return calculateTreePrices(treeWithQuantity, itemPrices, customCurrencyPrices)
 }