diff --git a/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountId.java b/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountId.java
index 99e433de..f1dc6ad5 100644
--- a/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountId.java
+++ b/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountId.java
@@ -1,18 +1,36 @@
 package com.strategyobject.substrateclient.rpc.types;
 
+import com.strategyobject.substrateclient.crypto.ss58.SS58Codec;
+import com.strategyobject.substrateclient.rpc.core.MetadataRegistry;
 import com.strategyobject.substrateclient.scale.ScaleSelfWritable;
 import com.strategyobject.substrateclient.types.FixedBytes;
 import com.strategyobject.substrateclient.types.Size;
 import lombok.NonNull;
+import lombok.var;
+
+import java.util.concurrent.atomic.AtomicReference;
 
 public class AccountId
         extends FixedBytes<Size.Of32>
         implements ScaleSelfWritable<AccountId> {
 
+    private final AtomicReference<String> encoded = new AtomicReference<>(null);
+
     protected AccountId(byte[] data) {
         super(data, Size.of32);
     }
 
+    @Override
+    public String toString() {
+        var result = encoded.get();
+        if (result != null) {
+            return result;
+        }
+
+        result = SS58Codec.encode(getData(), MetadataRegistry.getInstance().getSS58AddressFormat());
+        return encoded.compareAndSet(null, result) ? result : encoded.get();
+    }
+
     public static AccountId fromBytes(byte @NonNull [] data) {
         return new AccountId(data);
     }
diff --git a/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountIdEncoder.java b/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountIdEncoder.java
index cd754d79..b0852a03 100644
--- a/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountIdEncoder.java
+++ b/rpc/rpc-types/src/main/java/com/strategyobject/substrateclient/rpc/types/AccountIdEncoder.java
@@ -1,9 +1,7 @@
 package com.strategyobject.substrateclient.rpc.types;
 
 import com.google.common.base.Preconditions;
-import com.strategyobject.substrateclient.crypto.ss58.SS58Codec;
 import com.strategyobject.substrateclient.rpc.core.EncoderPair;
-import com.strategyobject.substrateclient.rpc.core.MetadataRegistry;
 import com.strategyobject.substrateclient.rpc.core.RpcEncoder;
 import com.strategyobject.substrateclient.rpc.core.annotations.AutoRegister;
 
@@ -13,6 +11,6 @@ public class AccountIdEncoder implements RpcEncoder<AccountId> {
     public Object encode(AccountId source, EncoderPair<?>... encoders) {
         Preconditions.checkArgument(encoders == null || encoders.length == 0);
 
-        return SS58Codec.encode(source.getData(), MetadataRegistry.getInstance().getSS58AddressFormat());
+        return source.toString();
     }
 }