--- /dev/null
+++ b/tests/src/substrate/rpc_defs.json
@@ -0,0 +1,76 @@
+{
+   "nft": {
+      "accountBalance": {
+         "description": "Get amount of different user tokens",
+         "params": [
+            {
+               "name": "collectionId",
+               "type": "CollectionId"
+            },
+            {
+               "name": "account",
+               "type": "CrossAccountId"
+            },
+            {
+               "isOptional": true,
+               "name": "at",
+               "type": "Hash"
+            }
+         ],
+         "type": "u32"
+      },
+      "adminlist": {
+         "description": "Get admin list",
+         "params": [
+            {
+               "name": "collectionId",
+               "type": "CollectionId"
+            },
+            {
+               "isOptional": true,
+               "name": "at",
+               "type": "Hash"
+            }
+         ],
+         "type": "Vec<AccountId>"
+      },
+      "balance": {
+         "description": "Get amount of specific account token",
+         "params": [
+            {
+               "name": "collectionId",
+               "type": "CollectionId"
+            },
+            {
+               "name": "account",
+               "type": "CrossAccountId"
+            },
+            {
+               "name": "tokenId",
+               "type": "TokenId"
+            },
+            {
+               "isOptional": true,
+               "name": "at",
+               "type": "Hash"
+            }
+         ],
+         "type": "u128"
+      },
+      "lastTokenId": {
+         "description": "Get last token id",
+         "params": [
+            {
+               "name": "collectionId",
+               "type": "CollectionId"
+            },
+            {
+               "isOptional": true,
+               "name": "at",
+               "type": "Hash"
+            }
+         ],
+         "type": "TokenId"
+      }
+   }
+}