diff --git a/src/main/java/com/staketab/minanames/controller/DomainController.java b/src/main/java/com/staketab/minanames/controller/DomainController.java
index 6504bcb..883b1dd 100644
--- a/src/main/java/com/staketab/minanames/controller/DomainController.java
+++ b/src/main/java/com/staketab/minanames/controller/DomainController.java
@@ -87,4 +87,9 @@ public ResponseEntity<DomainEntity> update(@RequestBody DomainUpdateDTO domainUp
     public ResponseEntity<Boolean> isDomainNameReserved(@PathVariable String domainName) {
         return ok(domainService.isNameReserved(domainName));
     }
+
+    @PutMapping("/{id}/default")
+    public ResponseEntity<Boolean> setDefaultDomain(@PathVariable String id) {
+        return ok(domainService.setDefaultDomain(id));
+    }
 }
diff --git a/src/main/java/com/staketab/minanames/repository/DomainRepository.java b/src/main/java/com/staketab/minanames/repository/DomainRepository.java
index 24a89f0..f37319b 100644
--- a/src/main/java/com/staketab/minanames/repository/DomainRepository.java
+++ b/src/main/java/com/staketab/minanames/repository/DomainRepository.java
@@ -33,4 +33,16 @@ public interface DomainRepository extends JpaRepository<DomainEntity, String> {
     Optional<DomainEntity> findDomainEntityByDomainName(String domainName);
 
     void deleteAllByTransactionIn(Collection<PayableTransactionEntity> transaction);
+
+    @Modifying
+    @Query(nativeQuery = true,
+            value = """
+            UPDATE domains
+            SET is_default = CASE
+                WHEN id = :id THEN true
+                ELSE false
+                END
+            WHERE owner_address = (select owner_address from domains where id = :id)
+                                    """)
+    int setDefaultDomain(String id);
 }
diff --git a/src/main/java/com/staketab/minanames/service/abstraction/DomainService.java b/src/main/java/com/staketab/minanames/service/abstraction/DomainService.java
index 5b4716d..9512790 100644
--- a/src/main/java/com/staketab/minanames/service/abstraction/DomainService.java
+++ b/src/main/java/com/staketab/minanames/service/abstraction/DomainService.java
@@ -16,4 +16,5 @@ public interface DomainService {
     Optional<DomainEntity> retrieve(String id);
     DomainEntity update(DomainUpdateDTO domainUpdateDTO);
     Boolean isNameReserved(String name);
+    Boolean setDefaultDomain(String id);
 }
diff --git a/src/main/java/com/staketab/minanames/service/impl/DomainServiceImpl.java b/src/main/java/com/staketab/minanames/service/impl/DomainServiceImpl.java
index e432823..80cd493 100644
--- a/src/main/java/com/staketab/minanames/service/impl/DomainServiceImpl.java
+++ b/src/main/java/com/staketab/minanames/service/impl/DomainServiceImpl.java
@@ -13,6 +13,7 @@
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.data.domain.Page;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import java.util.Optional;
 
@@ -64,4 +65,10 @@ public DomainEntity update(DomainUpdateDTO domainUpdateDTO) {
     public Boolean isNameReserved(String name) {
         return domainRepository.findDomainEntityByDomainName(name).isPresent();
     }
+
+    @Override
+    @Transactional
+    public Boolean setDefaultDomain(String id) {
+        return domainRepository.setDefaultDomain(id) > 0;
+    }
 }