diff --git a/.changeset/twelve-lobsters-allow.md b/.changeset/twelve-lobsters-allow.md
new file mode 100644
index 00000000..a845151c
--- /dev/null
+++ b/.changeset/twelve-lobsters-allow.md
@@ -0,0 +1,2 @@
+---
+---
diff --git a/src/event/EventOrder.ts b/src/event/EventOrder.ts
index 579f0694..13aedb18 100644
--- a/src/event/EventOrder.ts
+++ b/src/event/EventOrder.ts
@@ -333,7 +333,7 @@ class EventOrder {
     guardsOrder.push({
       address: GuardsErgoConfigs.bridgeFeeRepoAddress,
       assets: assets,
-      extra: Buffer.from(paymentTxId).toString(),
+      extra: Buffer.from(paymentTxId).toString('hex'),
     });
 
     // add emission to order
@@ -454,7 +454,7 @@ class EventOrder {
         nativeToken: minimumErg,
         tokens: guardTokens,
       },
-      extra: Buffer.from(paymentTxId).toString(),
+      extra: Buffer.from(paymentTxId).toString('hex'),
     });
 
     // add emission to order