diff --git a/transformers/GridSummonTransformer.tsx b/transformers/GridSummonTransformer.tsx
new file mode 100644
index 00000000..53d83cfc
--- /dev/null
+++ b/transformers/GridSummonTransformer.tsx
@@ -0,0 +1,26 @@
+import * as Summon from './SummonTransformer'
+
+// Transforms API response to GridSummon object
+export function toObject(data: any): GridSummon {
+  return {
+    id: data.id,
+    object: Summon.toObject(data.object),
+    position: data.position,
+    main: data.main,
+    friend: data.friend,
+    uncapLevel: data.uncap_level,
+    transcendenceStep: data.transcendence_step,
+    quickSummon: data.quick_summon,
+  }
+}
+
+// Transforms User object into API parameters
+export function toParams(data: GridSummon): GridSummonParams {
+  return {
+    summon_id: data.id,
+    position: data.position,
+    uncap_level: data.uncapLevel,
+    transcendence_step: data.transcendenceStep,
+    quick_summon: data.quickSummon,
+  }
+}
diff --git a/types/GridSummon.d.ts b/types/GridSummon.d.ts
index 865318b1..8d23ffe0 100644
--- a/types/GridSummon.d.ts
+++ b/types/GridSummon.d.ts
@@ -4,7 +4,7 @@ interface GridSummon {
   friend: boolean
   position: number
   object: Summon
-  uncap_level: number
-  quick_summon: boolean
-  transcendence_step: number
+  uncapLevel: number
+  transcendenceStep: number
+  quickSummon: boolean
 }
diff --git a/types/GridSummonParams.d.ts b/types/GridSummonParams.d.ts
new file mode 100644
index 00000000..b8ff2aaf
--- /dev/null
+++ b/types/GridSummonParams.d.ts
@@ -0,0 +1,7 @@
+interface GridSummonParams {
+  summon_id: string
+  position?: number
+  uncap_level?: number
+  transcendence_step?: number
+  quick_summon?: boolean
+}