diff --git a/package-lock.json b/package-lock.json
index 13edcb84..99bdfa62 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "copyfiles": "^2.4.1",
         "express": "^5",
         "mongoose": "^8.11.0",
-        "warframe-public-export-plus": "^0.5.40",
+        "warframe-public-export-plus": "^0.5.41",
         "warframe-riven-info": "^0.1.2",
         "winston": "^3.17.0",
         "winston-daily-rotate-file": "^5.0.0"
@@ -4083,9 +4083,9 @@
       }
     },
     "node_modules/warframe-public-export-plus": {
-      "version": "0.5.40",
-      "resolved": "https://registry.npmjs.org/warframe-public-export-plus/-/warframe-public-export-plus-0.5.40.tgz",
-      "integrity": "sha512-/qr46LE/KqDdEkW4z52EG0vZP0Z8U26FscFJ2G5K5ewbQdlSVxtf5fpOnzRkAO7jWWKfgoqx7l5WUgaLSPDj0g=="
+      "version": "0.5.41",
+      "resolved": "https://registry.npmjs.org/warframe-public-export-plus/-/warframe-public-export-plus-0.5.41.tgz",
+      "integrity": "sha512-qVOUY4UjF1cyBrBbMwD25xHSdSf9q57/CJgjHsfSE7NUu/6pBDSZzwS0iAetAukws/1V2kDvsuy8AGtOec2L1w=="
     },
     "node_modules/warframe-riven-info": {
       "version": "0.1.2",
diff --git a/package.json b/package.json
index 6fcb225d..50710c25 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "copyfiles": "^2.4.1",
     "express": "^5",
     "mongoose": "^8.11.0",
-    "warframe-public-export-plus": "^0.5.40",
+    "warframe-public-export-plus": "^0.5.41",
     "warframe-riven-info": "^0.1.2",
     "winston": "^3.17.0",
     "winston-daily-rotate-file": "^5.0.0"
diff --git a/src/controllers/api/artifactTransmutationController.ts b/src/controllers/api/artifactTransmutationController.ts
new file mode 100644
index 00000000..3fd52535
--- /dev/null
+++ b/src/controllers/api/artifactTransmutationController.ts
@@ -0,0 +1,124 @@
+import { toOid } from "@/src/helpers/inventoryHelpers";
+import { createVeiledRivenFingerprint, rivenRawToRealWeighted } from "@/src/helpers/rivenHelper";
+import { addMiscItems, addMods, getInventory } from "@/src/services/inventoryService";
+import { getAccountIdForRequest } from "@/src/services/loginService";
+import { getRandomElement, getRandomWeightedReward, getRandomWeightedRewardUc } from "@/src/services/rngService";
+import { IOid } from "@/src/types/commonTypes";
+import { RequestHandler } from "express";
+import { ExportBoosterPacks, ExportUpgrades, TRarity } from "warframe-public-export-plus";
+
+export const artifactTransmutationController: RequestHandler = async (req, res) => {
+    const accountId = await getAccountIdForRequest(req);
+    const inventory = await getInventory(accountId);
+    const payload = JSON.parse(String(req.body)) as IArtifactTransmutationRequest;
+
+    inventory.RegularCredits -= payload.Cost;
+    inventory.FusionPoints -= payload.FusionPointCost;
+
+    if (payload.RivenTransmute) {
+        addMiscItems(inventory, [
+            {
+                ItemType: "/Lotus/Types/Gameplay/Eidolon/Resources/SentientSecretItem",
+                ItemCount: -1
+            }
+        ]);
+
+        payload.Consumed.forEach(upgrade => {
+            inventory.Upgrades.pull({ _id: upgrade.ItemId.$oid });
+        });
+
+        const rawRivenType = getRandomRawRivenType();
+        const rivenType = getRandomElement(rivenRawToRealWeighted[rawRivenType]);
+        const fingerprint = createVeiledRivenFingerprint(ExportUpgrades[rivenType]);
+
+        const upgradeIndex =
+            inventory.Upgrades.push({
+                ItemType: rivenType,
+                UpgradeFingerprint: JSON.stringify(fingerprint)
+            }) - 1;
+        await inventory.save();
+        res.json({
+            NewMods: [
+                {
+                    ItemId: toOid(inventory.Upgrades[upgradeIndex]._id),
+                    ItemType: rivenType,
+                    UpgradeFingerprint: fingerprint
+                }
+            ]
+        });
+    } else {
+        const counts: Record<TRarity, number> = {
+            COMMON: 0,
+            UNCOMMON: 0,
+            RARE: 0,
+            LEGENDARY: 0
+        };
+        payload.Consumed.forEach(upgrade => {
+            const meta = ExportUpgrades[upgrade.ItemType];
+            counts[meta.rarity] += upgrade.ItemCount;
+            addMods(inventory, [
+                {
+                    ItemType: upgrade.ItemType,
+                    ItemCount: upgrade.ItemCount * -1
+                }
+            ]);
+        });
+
+        // Based on the table on https://wiki.warframe.com/w/Transmutation
+        const weights: Record<TRarity, number> = {
+            COMMON: counts.COMMON * 95 + counts.UNCOMMON * 15 + counts.RARE * 4,
+            UNCOMMON: counts.COMMON * 4 + counts.UNCOMMON * 80 + counts.RARE * 10,
+            RARE: counts.COMMON * 1 + counts.UNCOMMON * 5 + counts.RARE * 50,
+            LEGENDARY: 0
+        };
+
+        const options: { uniqueName: string; rarity: TRarity }[] = [];
+        Object.entries(ExportUpgrades).forEach(([uniqueName, upgrade]) => {
+            if (upgrade.canBeTransmutation) {
+                options.push({ uniqueName, rarity: upgrade.rarity });
+            }
+        });
+
+        const newModType = getRandomWeightedReward(options, weights)!.uniqueName;
+        addMods(inventory, [
+            {
+                ItemType: newModType,
+                ItemCount: 1
+            }
+        ]);
+
+        await inventory.save();
+        res.json({
+            NewMods: [
+                {
+                    ItemType: newModType,
+                    ItemCount: 1
+                }
+            ]
+        });
+    }
+};
+
+const getRandomRawRivenType = (): string => {
+    const pack = ExportBoosterPacks["/Lotus/Types/BoosterPacks/CalendarRivenPack"];
+    return getRandomWeightedRewardUc(pack.components, pack.rarityWeightsPerRoll[0])!.Item;
+};
+
+interface IArtifactTransmutationRequest {
+    Upgrade: IAgnosticUpgradeClient;
+    LevelDiff: number;
+    Consumed: IAgnosticUpgradeClient[];
+    Cost: number;
+    FusionPointCost: number;
+    RivenTransmute?: boolean;
+}
+
+interface IAgnosticUpgradeClient {
+    ItemType: string;
+    ItemId: IOid;
+    FromSKU: boolean;
+    UpgradeFingerprint: string;
+    PendingRerollFingerprint: string;
+    ItemCount: number;
+    LastAdded: IOid;
+}
diff --git a/src/routes/api.ts b/src/routes/api.ts
index bb63982e..964ebd5d 100644
--- a/src/routes/api.ts
+++ b/src/routes/api.ts
@@ -7,6 +7,7 @@ import { addFriendImageController } from "@/src/controllers/api/addFriendImageCo
 import { arcaneCommonController } from "@/src/controllers/api/arcaneCommonController";
 import { archonFusionController } from "@/src/controllers/api/archonFusionController";
 import { artifactsController } from "@/src/controllers/api/artifactsController";
+import { artifactTransmutationController } from "@/src/controllers/api/artifactTransmutationController";
 import { changeDojoRootController } from "@/src/controllers/api/changeDojoRootController";
 import { checkDailyMissionBonusController } from "@/src/controllers/api/checkDailyMissionBonusController";
 import { claimCompletedRecipeController } from "@/src/controllers/api/claimCompletedRecipeController";
@@ -150,6 +151,7 @@ apiRouter.post("/addFriendImage.php", addFriendImageController);
 apiRouter.post("/arcaneCommon.php", arcaneCommonController);
 apiRouter.post("/archonFusion.php", archonFusionController);
 apiRouter.post("/artifacts.php", artifactsController);
+apiRouter.post("/artifactTransmutation.php", artifactTransmutationController);
 apiRouter.post("/changeDojoRoot.php", changeDojoRootController);
 apiRouter.post("/claimCompletedRecipe.php", claimCompletedRecipeController);
 apiRouter.post("/clearDialogueHistory.php", clearDialogueHistoryController);