diff --git a/src/utils/expose.ts b/src/utils/expose.ts
index c8534923..1fe16cb8 100644
--- a/src/utils/expose.ts
+++ b/src/utils/expose.ts
@@ -54,6 +54,7 @@ export {
   getStampCostInBzz,
   getStampCostInPlur,
   getStampMaximumCapacityBytes,
+  getStampEffectiveBytes,
   getStampTtlSeconds,
   getStampUsage,
 } from './stamps'