diff --git a/blockfrost_api/Service.php b/blockfrost_api/Service.php
index 4761fd7..3d48d19 100644
--- a/blockfrost_api/Service.php
+++ b/blockfrost_api/Service.php
@@ -29,6 +29,8 @@ public function __construct($network, $projectId)
     public static $NETWORK_IPFS            = "https://ipfs.blockfrost.io/api/v0";
     public static $NETWORK_CARDANO_MAINNET = "https://cardano-mainnet.blockfrost.io/api/v0";
     public static $NETWORK_CARDANO_TESTNET = "https://cardano-testnet.blockfrost.io/api/v0";
+    public static $NETWORK_CARDANO_PREPROD = "https://cardano-preprod.blockfrost.io/api/v0";
+    public static $NETWORK_CARDANO_PREVIEW = "https://cardano-preview.blockfrost.io/api/v0";
     
     
     
@@ -207,4 +209,4 @@ public static function streamFromString(string $s):StreamInterface
 }
     
     
-?>
\ No newline at end of file
+?>