diff --git a/src/main/java/com/sparrowwallet/sparrow/net/BroadcastSource.java b/src/main/java/com/sparrowwallet/sparrow/net/BroadcastSource.java
index 2b8dbd08..6577f59c 100644
--- a/src/main/java/com/sparrowwallet/sparrow/net/BroadcastSource.java
+++ b/src/main/java/com/sparrowwallet/sparrow/net/BroadcastSource.java
@@ -46,7 +46,7 @@ public enum BroadcastSource {
 
         @Override
         public List<Network> getSupportedNetworks() {
-            return List.of(Network.MAINNET, Network.TESTNET, Network.SIGNET);
+            return List.of(Network.MAINNET, Network.TESTNET, Network.SIGNET, Network.TESTNET4);
         }
 
         protected URL getURL(HostAndPort proxy) throws MalformedURLException {
@@ -56,6 +56,8 @@ public enum BroadcastSource {
                 return new URL(getBaseUrl(proxy) + "/testnet/api/tx");
             } else if(Network.get() == Network.SIGNET) {
                 return new URL(getBaseUrl(proxy) + "/signet/api/tx");
+            } else if(Network.get() == Network.TESTNET4) {
+                return new URL(getBaseUrl(proxy) + "/testnet4/api/tx");
             } else {
                 throw new IllegalStateException("Cannot broadcast transaction to " + getName() + " on network " + Network.get());
             }
@@ -77,6 +79,8 @@ public enum BroadcastSource {
                 return new URL(getBaseUrl(proxy) + "/api/tx");
             } else if(Network.get() == Network.TESTNET) {
                 return new URL(getBaseUrl(proxy) + "/testnet/api/tx");
+            } else if(Network.get() == Network.SIGNET) {
+                return new URL(getBaseUrl(proxy) + "/signet/api/tx");
             } else {
                 throw new IllegalStateException("Cannot broadcast transaction to " + getName() + " on network " + Network.get());
             }
diff --git a/src/main/java/com/sparrowwallet/sparrow/net/PublicElectrumServer.java b/src/main/java/com/sparrowwallet/sparrow/net/PublicElectrumServer.java
index dfe0cba0..468ec242 100644
--- a/src/main/java/com/sparrowwallet/sparrow/net/PublicElectrumServer.java
+++ b/src/main/java/com/sparrowwallet/sparrow/net/PublicElectrumServer.java
@@ -17,14 +17,15 @@ public enum PublicElectrumServer {
     SETHFORPRIVACY_COM("fulcrum.sethforprivacy.com", "ssl://fulcrum.sethforprivacy.com:50002", Network.MAINNET),
     TESTNET_ARANGUREN_ORG("testnet.aranguren.org", "ssl://testnet.aranguren.org:51002", Network.TESTNET),
     TESTNET_QTORNADO_COM("testnet.qtornado.com", "ssl://testnet.qtornado.com:51002", Network.TESTNET),
-    SIGNET_MEMPOOL_SPACE("mempool.space", "ssl://mempool.space:60602", Network.SIGNET);
+    SIGNET_MEMPOOL_SPACE("mempool.space", "ssl://mempool.space:60602", Network.SIGNET),
+    TESTNET4_MEMPOOL_SPACE("mempool.space", "ssl://mempool.space:40002", Network.TESTNET4);
 
     PublicElectrumServer(String name, String url, Network network) {
         this.server = new Server(url, name);
         this.network = network;
     }
 
-    public static final List<Network> SUPPORTED_NETWORKS = List.of(Network.MAINNET, Network.TESTNET, Network.SIGNET);
+    public static final List<Network> SUPPORTED_NETWORKS = List.of(Network.MAINNET, Network.TESTNET, Network.SIGNET, Network.TESTNET4);
 
     private final Server server;
     private final Network network;