diff --git a/app/constants/fees.js b/app/constants/fees.js
new file mode 100644
index 0000000..498e95d
--- /dev/null
+++ b/app/constants/fees.js
@@ -0,0 +1,8 @@
+// @flow
+
+export default {
+  LOW: 1,
+  MEDIUM: 5,
+  HIGH: 9,
+  CUSTOM: 'custom',
+};