diff --git a/apps/api/src/database/migrations/2026-06-03.ts b/apps/api/src/database/migrations/2026-06-03.ts
index e0a0bc2..371fb43 100644
--- a/apps/api/src/database/migrations/2026-06-03.ts
+++ b/apps/api/src/database/migrations/2026-06-03.ts
@@ -31,7 +31,7 @@ export async function up(db: Kysely<any>): Promise<void> {
     await db.schema.createTable("calculator_configs")
         .$call(addDefaultColumns)
         .addColumn("standards_config", "jsonb", (cb) => cb.notNull())
-        .addColumn("is_selected", "boolean", (cb) => cb.notNull())
+        .addColumn("is_selected", "boolean", (cb) => cb.notNull().defaultTo(false))
         .execute();
 
     // INDEX: ONE_SELECTED_CALCULATOR_CONFIG
diff --git a/apps/api/src/server.ts b/apps/api/src/server.ts
index a44b175..29418a8 100644
--- a/apps/api/src/server.ts
+++ b/apps/api/src/server.ts
@@ -18,6 +18,7 @@ import { CommerceService } from "./services/commerce";
 import cluster from "node:cluster";
 import { randomUUIDv7 } from "bun";
 import { CalculatorService } from "./services/calculator";
+import { StandardsConfigSchema } from "@blade-and-brawn/calculator";
 
 // SERVICES
 // -----------
@@ -100,6 +101,7 @@ export const app = new Elysia()
     // CALCULATOR
     .group("/calculator",
         (app) => app
+            // Non-authenticated
             .post("/calculate", async ({ body }) => {
                 return { levels: calculatorService.calculate(body.player, body.activityPerformances) };
             }, {
@@ -108,15 +110,30 @@ export const app = new Elysia()
                     activityPerformances: t.Array(ActivityPerformanceSchema)
                 }),
             })
+            // Authenticated
             .resolve(async ({ jwt, cookie: { auth } }) => {
                 const token = auth.value && await jwt.verify(auth.value);
                 if (!token || !token.sessionId) throw status(401, "Unauthorized");
                 return { sessionId: token.sessionId.toString() };
             })
-            .post("/config", () => { })
+            .put("/config/:id", async ({ params: { id }, body: { standardsConfig } }) => {
+                await calculatorService.setConfig(id, standardsConfig);
+            }, {
+                params: t.Object({ id: t.String() }),
+                body: t.Object({ standardsConfig: StandardsConfigSchema })
+            })
+            .post("/config", async ({ body: { standardsConfig } }) => {
+                await calculatorService.createConfig(standardsConfig);
+            }, {
+                body: t.Object({ standardsConfig: StandardsConfigSchema })
+            })
+            .post("/config/:id/select", async ({ params: { id } }) => {
+                await calculatorService.selectConfig(id);
+            }, {
+                params: t.Object({ id: t.String() })
+            })
             .get("/config", async () => {
-                const config = await calculatorService.getConfig();
-                return config;
+                return await calculatorService.getSelectedConfig();
             })
     )
 
@@ -150,8 +167,8 @@ export const app = new Elysia()
                         });
                     }, { params: t.Object({ printfulProductId: t.Optional(t.Numeric()) }) }),
             )
-            .get("/:printfulProductId", async ({ params }) => {
-                const printfulProduct = await commerceService.printful.Products.get(params.printfulProductId);
+            .get("/:printfulProductId", async ({ params: { printfulProductId } }) => {
+                const printfulProduct = await commerceService.printful.Products.get(printfulProductId);
                 if (!printfulProduct) throw new NotFoundError("Missing printful product");
 
                 const webflowProductId = printfulProduct.sync_product.external_id.split("-")[0];
diff --git a/apps/api/src/services/calculator.ts b/apps/api/src/services/calculator.ts
index 62610a2..b34ea4a 100644
--- a/apps/api/src/services/calculator.ts
+++ b/apps/api/src/services/calculator.ts
@@ -21,13 +21,41 @@ export class CalculatorService {
         return this.levelCalculator.calculate(player, activityPerformances);
     }
 
-    async getConfig(opt: { skipCache?: boolean } = {}): Promise<StandardsConfig> {
+    async getSelectedConfig(opt: { skipCache?: boolean } = {}): Promise<StandardsConfig> {
         if (!opt.skipCache) return this.levelCalculator.standards.cfg;
 
         await this.refreshConfig();
         return this.levelCalculator.standards.cfg;
     }
 
+    async selectConfig(id: string) {
+        await db.transaction().execute(async (trx) => {
+            await trx.updateTable("calculator_configs")
+                .set({ is_selected: false })
+                .where("is_selected", "=", true)
+                .execute();
+            const result = await trx.updateTable("calculator_configs")
+                .set({ is_selected: true })
+                .where("id", "=", id)
+                .execute();
+            if (result[0]?.numUpdatedRows === 0n) throw new Error(`No config with id "${id}"`);
+        });
+    }
+
+    async setConfig(id: string, standardsConfig: StandardsConfig) {
+        const result = await db.updateTable("calculator_configs")
+            .set({ standards_config: standardsConfig })
+            .where("id", "=", id)
+            .execute();
+        if (result[0]?.numUpdatedRows === 0n) throw new Error(`No config with id "${id}"`);
+    }
+
+    async createConfig(standardsConfig: StandardsConfig) {
+        await db.insertInto("calculator_configs")
+            .values({ standards_config: standardsConfig })
+            .execute();
+    }
+
     async refreshConfig(opt: { onlyIfStale?: boolean } = {}) {
         if (opt.onlyIfStale)
             if (Date.now() - this.lastRefreshedAt < CalculatorService.CONFIG_REFRESH_INTERVAL_MS) return;
diff --git a/packages/calculator/src/default-config.json b/packages/calculator/src/default-config.json
new file mode 100644
index 0000000..a71140c
--- /dev/null
+++ b/packages/calculator/src/default-config.json
@@ -0,0 +1,79 @@
+{
+    "global": {
+        "maxLevel": 100
+    },
+    "activity": {
+        "BackSquat": {
+            "enableGeneration": true,
+            "weightModifier": 0,
+            "weightSkew": 0,
+            "ageModifier": 0,
+            "difficultyModifier": 0.3,
+            "peakAge": 0,
+            "stretch": {
+                "upper": 0,
+                "lower": 1
+            }
+        },
+        "BenchPress": {
+            "enableGeneration": true,
+            "weightModifier": 0,
+            "weightSkew": 0,
+            "ageModifier": 0,
+            "difficultyModifier": 0.05,
+            "peakAge": 0,
+            "stretch": {
+                "upper": 1,
+                "lower": 0
+            }
+        },
+        "Deadlift": {
+            "enableGeneration": true,
+            "weightModifier": 0,
+            "weightSkew": 0,
+            "ageModifier": 0,
+            "difficultyModifier": -0.05,
+            "peakAge": 0,
+            "stretch": {
+                "upper": 1,
+                "lower": 0
+            }
+        },
+        "Run": {
+            "enableGeneration": true,
+            "weightModifier": 0.1,
+            "weightSkew": 0,
+            "ageModifier": 0,
+            "difficultyModifier": 0.35,
+            "peakAge": 0,
+            "stretch": {
+                "upper": 1,
+                "lower": 1
+            }
+        },
+        "BroadJump": {
+            "enableGeneration": true,
+            "weightModifier": -0.1,
+            "weightSkew": 0,
+            "ageModifier": -0.25,
+            "difficultyModifier": -0.15,
+            "peakAge": 23,
+            "stretch": {
+                "upper": 3,
+                "lower": 1
+            }
+        },
+        "ConeDrill": {
+            "enableGeneration": true,
+            "weightModifier": -0.1,
+            "weightSkew": 0,
+            "ageModifier": -0.25,
+            "difficultyModifier": 0.15,
+            "peakAge": 23,
+            "stretch": {
+                "upper": 0,
+                "lower": 2
+            }
+        }
+    }
+}