diff --git a/network-store-client/src/main/java/com/powsybl/network/store/client/RestClientImpl.java b/network-store-client/src/main/java/com/powsybl/network/store/client/RestClientImpl.java
index 7a0eda37b..3a22c4537 100644
--- a/network-store-client/src/main/java/com/powsybl/network/store/client/RestClientImpl.java
+++ b/network-store-client/src/main/java/com/powsybl/network/store/client/RestClientImpl.java
@@ -113,6 +113,19 @@ private <T, D extends AbstractTopLevelDocument<T>> Optional<T> getOneDocument(St
         }
     }
 
+    @Override
+    public Optional<ExtensionAttributes> getOneExtensionAttributes(String url, Object... uriVariables) {
+        ResponseEntity<ExtensionAttributes> response = restTemplate.exchange(url, HttpMethod.GET, null, new ParameterizedTypeReference<>() { }, uriVariables);
+        if (response.getStatusCode() == HttpStatus.OK) {
+            ExtensionAttributes body = response.getBody();
+            return Optional.of(body);
+        } else if (response.getStatusCode() == HttpStatus.NOT_FOUND) {
+            return Optional.empty();
+        } else {
+            throw createHttpException(url, "get", response.getStatusCode());
+        }
+    }
+
     @Override
     public <T extends IdentifiableAttributes> List<Resource<T>> getAll(String target, String url, Object... uriVariables) {
         ResponseEntity<TopLevelDocument<T>> response = getDocument(url, new ParameterizedTypeReference<>() {
diff --git a/network-store-client/src/main/java/com/powsybl/network/store/client/RestNetworkStoreClient.java b/network-store-client/src/main/java/com/powsybl/network/store/client/RestNetworkStoreClient.java
index c94cdebf8..a0c68d986 100644
--- a/network-store-client/src/main/java/com/powsybl/network/store/client/RestNetworkStoreClient.java
+++ b/network-store-client/src/main/java/com/powsybl/network/store/client/RestNetworkStoreClient.java
@@ -899,7 +899,7 @@ public Optional<ExtensionAttributes> getExtensionAttributes(UUID networkUuid, in
 
     @Override
     public Map<String, ExtensionAttributes> getAllExtensionsAttributesByResourceTypeAndExtensionName(UUID networkUuid, int variantNum, ResourceType resourceType, String extensionName) {
-        return getExtensionAttributesMap("/networks/{networkUuid}/{variantNum}/identifiables/types/{type}/extensions/{extensionName}", networkUuid, variantNum, resourceType, extensionName);
+        return getExtensionAttributesMap("/networks/{networkUuid}/{variantNum}/types/{type}/extensions/{extensionName}", networkUuid, variantNum, resourceType, extensionName);
     }
 
     @Override
@@ -909,7 +909,7 @@ public Map<String, ExtensionAttributes> getAllExtensionsAttributesByIdentifiable
 
     @Override
     public Map<String, Map<String, ExtensionAttributes>> getAllExtensionsAttributesByResourceType(UUID networkUuid, int variantNum, ResourceType resourceType) {
-        return getExtensionAttributesNestedMap("/networks/{networkUuid}/{variantNum}/identifiables/types/{resourceType}/extensions", networkUuid, variantNum, resourceType);
+        return getExtensionAttributesNestedMap("/networks/{networkUuid}/{variantNum}/types/{resourceType}/extensions", networkUuid, variantNum, resourceType);
     }
 
     @Override
diff --git a/network-store-client/src/test/java/com/powsybl/network/store/client/PreloadingNetworkStoreClientTest.java b/network-store-client/src/test/java/com/powsybl/network/store/client/PreloadingNetworkStoreClientTest.java
index c80c5a01d..f0c981ec4 100644
--- a/network-store-client/src/test/java/com/powsybl/network/store/client/PreloadingNetworkStoreClientTest.java
+++ b/network-store-client/src/test/java/com/powsybl/network/store/client/PreloadingNetworkStoreClientTest.java
@@ -831,7 +831,7 @@ public void testGetExtensionCache() throws IOException {
 
         String extensionAttributes = objectMapper.writerFor(new TypeReference<Map<String, ExtensionAttributes>>() {
         }).writeValueAsString(Map.of(identifiableId1, apc1, identifiableId2, apc2));
-        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/identifiables/types/" + ResourceType.GENERATOR + "/extensions/activepowercontrol"))
+        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/types/" + ResourceType.GENERATOR + "/extensions/activepowercontrol"))
                 .andExpect(method(GET))
                 .andRespond(withSuccess(extensionAttributes, MediaType.APPLICATION_JSON));
 
@@ -855,7 +855,7 @@ public void testGetExtensionEmptyExtensionAttributesCache() throws IOException {
         String identifiableId1 = "GEN";
         String extensionAttributes = objectMapper.writerFor(new TypeReference<Map<String, ExtensionAttributes>>() {
         }).writeValueAsString(Map.of());
-        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/identifiables/types/" + ResourceType.GENERATOR + "/extensions/activepowercontrol"))
+        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/types/" + ResourceType.GENERATOR + "/extensions/activepowercontrol"))
                 .andExpect(method(GET))
                 .andRespond(withSuccess(extensionAttributes, MediaType.APPLICATION_JSON));
 
@@ -898,7 +898,7 @@ public void testGetExtensionsCache() throws IOException {
 
         String multipleExtensionAttributes = objectMapper.writerFor(new TypeReference<Map<String, Map<String, ExtensionAttributes>>>() {
         }).writeValueAsString(Map.of(identifiableId1, Map.of(ActivePowerControl.NAME, apc1, GeneratorStartup.NAME, gs1), identifiableId2, Map.of(ActivePowerControl.NAME, apc2)));
-        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/identifiables/types/" + ResourceType.GENERATOR + "/extensions"))
+        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/types/" + ResourceType.GENERATOR + "/extensions"))
                 .andExpect(method(GET))
                 .andRespond(withSuccess(multipleExtensionAttributes, MediaType.APPLICATION_JSON));
 
@@ -925,7 +925,7 @@ public void testGetExtensionsEmptyExtensionAttributesCache() throws IOException
         // Two successive ExtensionAttributes retrieval, only the first should send a REST request, the second uses the cache
         String multipleExtensionAttributes = objectMapper.writerFor(new TypeReference<Map<String, Map<String, ExtensionAttributes>>>() {
         }).writeValueAsString(Map.of());
-        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/identifiables/types/" + ResourceType.GENERATOR + "/extensions"))
+        server.expect(ExpectedCount.once(), requestTo("/networks/" + networkUuid + "/" + Resource.INITIAL_VARIANT_NUM + "/types/" + ResourceType.GENERATOR + "/extensions"))
                 .andExpect(method(GET))
                 .andRespond(withSuccess(multipleExtensionAttributes, MediaType.APPLICATION_JSON));