diff --git a/src/main/java/io/zold/api/WalletsIn.java b/src/main/java/io/zold/api/WalletsIn.java
index def2558..43ec47d 100644
--- a/src/main/java/io/zold/api/WalletsIn.java
+++ b/src/main/java/io/zold/api/WalletsIn.java
@@ -23,9 +23,15 @@
  */
 package io.zold.api;
 
+import java.io.IOException;
+import java.nio.file.FileSystems;
 import java.nio.file.Path;
 import java.util.Iterator;
 import org.cactoos.Scalar;
+import org.cactoos.func.IoCheckedFunc;
+import org.cactoos.io.Directory;
+import org.cactoos.iterable.Filtered;
+import org.cactoos.iterable.Mapped;
 import org.cactoos.scalar.IoCheckedScalar;
 import org.cactoos.scalar.StickyScalar;
 import org.cactoos.scalar.SyncScalar;
@@ -36,8 +42,8 @@
  * @author Tolegen Izbassar (t.izbassar@gmail.com)
  * @version $Id$
  * @since 0.1
+ * @checkstyle ClassDataAbstractionCoupling (2 lines)
  */
-@SuppressWarnings({"PMD.SingularField", "PMD.UnusedPrivateField"})
 public final class WalletsIn implements Wallets {
 
     /**
@@ -45,26 +51,39 @@ public final class WalletsIn implements Wallets {
      */
     private final IoCheckedScalar<Path> path;
 
+    /**
+     * Filter for matching file extensions.
+     */
+    private final IoCheckedFunc<Path, Boolean> filter;
+
     /**
      * Ctor.
      * @param pth Path with wallets
      */
     public WalletsIn(final Path pth) {
         this(
-            () -> pth
+            () -> pth,
+            "z"
         );
     }
 
     /**
      * Ctor.
      * @param pth Path with wallets
+     * @param ext File extension to match
      */
-    public WalletsIn(final Scalar<Path> pth) {
+    public WalletsIn(final Scalar<Path> pth, final String ext) {
         this.path = new IoCheckedScalar<>(
             new SyncScalar<>(
                 new StickyScalar<>(pth)
             )
         );
+        this.filter = new IoCheckedFunc<Path, Boolean>(
+            (file) -> file.toFile().isFile()
+                && FileSystems.getDefault()
+                    .getPathMatcher(String.format("glob:**.%s", ext))
+                    .matches(file)
+        );
     }
 
     // @todo #4:30min Return the new instance of the Wallet, that will
@@ -76,12 +95,16 @@ public Wallet create() {
         throw new UnsupportedOperationException("create() not yet supported");
     }
 
-    // @todo #4:30min Read instance of the Wallet from file and put it
-    //  to the result. Should be taken care of after Wallet interface will have
-    //  necessary implementations. Cover with tests and remove irrelevant test
-    //  case.
     @Override
+    @SuppressWarnings("PMD.AvoidInstantiatingObjectsInLoops")
     public Iterator<Wallet> iterator() {
-        throw new UnsupportedOperationException("iterator() not yet supported");
+        try {
+            return new Mapped<Path, Wallet>(
+                (pth) -> new Wallet.File(pth),
+                new Filtered<>(this.filter, new Directory(this.path.value()))
+            ).iterator();
+        } catch (final IOException ex) {
+            throw new IllegalStateException(ex);
+        }
     }
 }
diff --git a/src/test/java/io/zold/api/WalletsInTest.java b/src/test/java/io/zold/api/WalletsInTest.java
index 30f0f36..654a8b0 100644
--- a/src/test/java/io/zold/api/WalletsInTest.java
+++ b/src/test/java/io/zold/api/WalletsInTest.java
@@ -24,6 +24,8 @@
 package io.zold.api;
 
 import java.io.IOException;
+import java.nio.file.Paths;
+import org.hamcrest.MatcherAssert;
 import org.hamcrest.Matchers;
 import org.junit.Rule;
 import org.junit.Test;
@@ -48,16 +50,12 @@ public final class WalletsInTest {
     public final TemporaryFolder folder = new TemporaryFolder();
 
     @Test
-    public void iteratorIsNotYetImplemented() throws IOException {
-        this.thrown.expect(UnsupportedOperationException.class);
-        this.thrown.expectMessage(
-            Matchers.is(
-                "iterator() not yet supported"
-            )
+    public void iteratesWallets() {
+        MatcherAssert.assertThat(
+            new WalletsIn(Paths.get("src/test/resources/walletsIn")),
+            // @checkstyle MagicNumber (1 line)
+            Matchers.iterableWithSize(5)
         );
-        new WalletsIn(
-            this.folder.newFolder().toPath()
-        ).iterator();
     }
 
     @Test
diff --git a/src/test/resources/walletsIn/1.z b/src/test/resources/walletsIn/1.z
new file mode 100644
index 0000000..c8c82ca
--- /dev/null
+++ b/src/test/resources/walletsIn/1.z
@@ -0,0 +1,7 @@
+zold
+1
+1
+MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgGZCr/9hBChqsChd4sRAIpKNRinjhSW+J+S7PU5malVMiRHVoKjeooLDpWpij0A6vkzOvjrMldAZT0Fzgp0cJ15TOVwiQanQ5WuQDgRkLoxrdh/qyBApoDvk4OUEozOQPNwfpZOFfaUALPsPnv9995TlY9WcdSKW5dj041p1tJmlAgMBAAE=
+
+003a;2017-07-19T21:24:51Z;ffffffff9c0ccccd;Ui0wpLu7;98bb82c81735c4ee;For services;SKMPrVj...
+003b;2017-07-19T21:25:07Z;ffffffffffa72367;xksQuJa9;98bb82c81735c4ee;For food;QCuLuVr4...
\ No newline at end of file
diff --git a/src/test/resources/walletsIn/2.z b/src/test/resources/walletsIn/2.z
new file mode 100644
index 0000000..ccd935b
--- /dev/null
+++ b/src/test/resources/walletsIn/2.z
@@ -0,0 +1,7 @@
+zold
+1
+2
+MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgGZCr/9hBChqsChd4sRAIpKNRinjhSW+J+S7PU5malVMiRHVoKjeooLDpWpij0A6vkzOvjrMldAZT0Fzgp0cJ15TOVwiQanQ5WuQDgRkLoxrdh/qyBApoDvk4OUEozOQPNwfpZOFfaUALPsPnv9995TlY9WcdSKW5dj041p1tJmlAgMBAAE=
+
+003a;2017-07-19T21:24:51Z;ffffffff9c0ccccd;Ui0wpLu7;98bb82c81735c4ee;For services;SKMPrVj...
+003b;2017-07-19T21:25:07Z;ffffffffffa72367;xksQuJa9;98bb82c81735c4ee;For food;QCuLuVr4...
\ No newline at end of file
diff --git a/src/test/resources/walletsIn/3.z b/src/test/resources/walletsIn/3.z
new file mode 100644
index 0000000..51e77d5
--- /dev/null
+++ b/src/test/resources/walletsIn/3.z
@@ -0,0 +1,7 @@
+zold
+1
+3
+MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgGZCr/9hBChqsChd4sRAIpKNRinjhSW+J+S7PU5malVMiRHVoKjeooLDpWpij0A6vkzOvjrMldAZT0Fzgp0cJ15TOVwiQanQ5WuQDgRkLoxrdh/qyBApoDvk4OUEozOQPNwfpZOFfaUALPsPnv9995TlY9WcdSKW5dj041p1tJmlAgMBAAE=
+
+003a;2017-07-19T21:24:51Z;ffffffff9c0ccccd;Ui0wpLu7;98bb82c81735c4ee;For services;SKMPrVj...
+003b;2017-07-19T21:25:07Z;ffffffffffa72367;xksQuJa9;98bb82c81735c4ee;For food;QCuLuVr4...
\ No newline at end of file
diff --git a/src/test/resources/walletsIn/4.z b/src/test/resources/walletsIn/4.z
new file mode 100644
index 0000000..8ab861b
--- /dev/null
+++ b/src/test/resources/walletsIn/4.z
@@ -0,0 +1,7 @@
+zold
+1
+4
+MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgGZCr/9hBChqsChd4sRAIpKNRinjhSW+J+S7PU5malVMiRHVoKjeooLDpWpij0A6vkzOvjrMldAZT0Fzgp0cJ15TOVwiQanQ5WuQDgRkLoxrdh/qyBApoDvk4OUEozOQPNwfpZOFfaUALPsPnv9995TlY9WcdSKW5dj041p1tJmlAgMBAAE=
+
+003a;2017-07-19T21:24:51Z;ffffffff9c0ccccd;Ui0wpLu7;98bb82c81735c4ee;For services;SKMPrVj...
+003b;2017-07-19T21:25:07Z;ffffffffffa72367;xksQuJa9;98bb82c81735c4ee;For food;QCuLuVr4...
\ No newline at end of file
diff --git a/src/test/resources/walletsIn/5.z b/src/test/resources/walletsIn/5.z
new file mode 100644
index 0000000..63d6701
--- /dev/null
+++ b/src/test/resources/walletsIn/5.z
@@ -0,0 +1,7 @@
+zold
+1
+5
+MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgGZCr/9hBChqsChd4sRAIpKNRinjhSW+J+S7PU5malVMiRHVoKjeooLDpWpij0A6vkzOvjrMldAZT0Fzgp0cJ15TOVwiQanQ5WuQDgRkLoxrdh/qyBApoDvk4OUEozOQPNwfpZOFfaUALPsPnv9995TlY9WcdSKW5dj041p1tJmlAgMBAAE=
+
+003a;2017-07-19T21:24:51Z;ffffffff9c0ccccd;Ui0wpLu7;98bb82c81735c4ee;For services;SKMPrVj...
+003b;2017-07-19T21:25:07Z;ffffffffffa72367;xksQuJa9;98bb82c81735c4ee;For food;QCuLuVr4...
\ No newline at end of file
diff --git a/src/test/resources/walletsIn/6 b/src/test/resources/walletsIn/6
new file mode 100644
index 0000000..50d3dde
--- /dev/null
+++ b/src/test/resources/walletsIn/6
@@ -0,0 +1,7 @@
+zold
+1
+6
+MIGeMA0GCSqGSIb3DQEBAQUAA4GMADCBiAKBgGZCr/9hBChqsChd4sRAIpKNRinjhSW+J+S7PU5malVMiRHVoKjeooLDpWpij0A6vkzOvjrMldAZT0Fzgp0cJ15TOVwiQanQ5WuQDgRkLoxrdh/qyBApoDvk4OUEozOQPNwfpZOFfaUALPsPnv9995TlY9WcdSKW5dj041p1tJmlAgMBAAE=
+
+003a;2017-07-19T21:24:51Z;ffffffff9c0ccccd;Ui0wpLu7;98bb82c81735c4ee;For services;SKMPrVj...
+003b;2017-07-19T21:25:07Z;ffffffffffa72367;xksQuJa9;98bb82c81735c4ee;For food;QCuLuVr4...
\ No newline at end of file