diff --git a/src/main/kotlin/net/thauvin/erik/bitly/Utils.kt b/src/main/kotlin/net/thauvin/erik/bitly/Utils.kt
index 57cb313..53ab79a 100644
--- a/src/main/kotlin/net/thauvin/erik/bitly/Utils.kt
+++ b/src/main/kotlin/net/thauvin/erik/bitly/Utils.kt
@@ -49,22 +49,9 @@ import java.util.logging.Logger
 /** Useful functions. */
 open class Utils private constructor() {
     companion object {
-        /** The logger instance. **/
+        /** The logger instance. */
         val logger: Logger by lazy { Logger.getLogger(Bitly::class.java.simpleName) }
 
-        /**
-         * Builds the full API endpoint URL using the [Constants.API_BASE_URL].
-         *
-         * @param endPointPath The REST request path. (eg. `/shorten', '/user`)
-         */
-        fun buildEndPointUrl(endPointPath: String): String {
-            return if (endPointPath.startsWith('/')) {
-                "${Constants.API_BASE_URL}$endPointPath"
-            } else {
-                "${Constants.API_BASE_URL}/$endPointPath"
-            }
-        }
-
         /**
          * Executes an API call.
          *
@@ -74,10 +61,11 @@ open class Utils private constructor() {
          * @param method The submission [Method][Methods].
          * @return The response (JSON) from the API.
          */
+        @JvmOverloads
         fun call(
             accessToken: String,
             endPoint: String,
-            params: Map<String, String>,
+            params: Map<String, String> = emptyMap(),
             method: Methods = Methods.POST
         ): String {
             var response = Constants.EMPTY
@@ -153,6 +141,39 @@ open class Utils private constructor() {
             return Constants.EMPTY
         }
 
+        /**
+         * Validates a URL.
+         */
+        fun String.isValidUrl(): Boolean {
+            if (this.isNotBlank()) {
+                try {
+                    URL(this)
+                    return true
+                } catch (e: MalformedURLException) {
+                    logger.log(Level.FINE, "Invalid URL: $this", e)
+                }
+            }
+            return false
+        }
+
+        /**
+         * Removes http(s) scheme from string.
+         */
+        fun String.removeHttp(): String {
+            return this.replaceFirst(Regex("^[Hh][Tt]{2}[Pp][Ss]?://"), "")
+        }
+
+        /**
+         * Builds the full API endpoint URL using the [Constants.API_BASE_URL].
+         */
+        fun String.toEndPoint(): String {
+            return if (this.startsWith('/')) {
+                "${Constants.API_BASE_URL}$this"
+            } else {
+                "${Constants.API_BASE_URL}/$this"
+            }
+        }
+
         private fun validateCall(accessToken: String, endPoint: String): Boolean {
             when {
                 endPoint.isBlank() -> logger.severe("Please specify a valid API endpoint.")
@@ -161,20 +182,5 @@ open class Utils private constructor() {
             }
             return false
         }
-
-        /**
-         * Validates a URL.
-         */
-        fun validateUrl(url: String): Boolean {
-            if (url.isNotBlank()) {
-                try {
-                    URL(url)
-                    return true
-                } catch (e: MalformedURLException) {
-                    logger.log(Level.FINE, "Invalid URL: $url", e)
-                }
-            }
-            return false
-        }
     }
 }
diff --git a/src/test/kotlin/net/thauvin/erik/bitly/BitlyTest.kt b/src/test/kotlin/net/thauvin/erik/bitly/BitlyTest.kt
index 9f75f5d..21602c0 100644
--- a/src/test/kotlin/net/thauvin/erik/bitly/BitlyTest.kt
+++ b/src/test/kotlin/net/thauvin/erik/bitly/BitlyTest.kt
@@ -32,6 +32,9 @@
 
 package net.thauvin.erik.bitly
 
+import net.thauvin.erik.bitly.Utils.Companion.removeHttp
+import net.thauvin.erik.bitly.Utils.Companion.toEndPoint
+import org.json.JSONObject
 import org.junit.Before
 import java.io.File
 import java.util.logging.Level
@@ -72,7 +75,7 @@ class BitlyTest {
         val test = Bitly().apply { accessToken = "12345679" }
         assertEquals(
             "{\"message\":\"FORBIDDEN\"}",
-            test.bitlinks().shorten("https://erik.thauvin.net/blog", isJson = true)
+            test.bitlinks().shorten("https://erik.thauvin.net/blog", toJson = true)
         )
     }
 
@@ -89,12 +92,22 @@ class BitlyTest {
 
     @Test
     fun `as json`() {
-        assertTrue(bitly.bitlinks().shorten(longUrl, isJson = true).startsWith("{\"created_at\":"))
+        assertTrue(bitly.bitlinks().shorten(longUrl, toJson = true).startsWith("{\"created_at\":"))
     }
 
     @Test
     fun `get user`() {
-        assertTrue(bitly.call(Utils.buildEndPointUrl("user"), emptyMap(), Methods.GET).contains("\"login\":"))
+        assertTrue(bitly.call("/user".toEndPoint(), method = Methods.GET).contains("\"login\":"))
+    }
+
+    @Test
+    fun `created by`() {
+        assertEquals(
+            "ethauvin",
+            JSONObject(
+                bitly.call("/bitlinks/${shortUrl.removeHttp()}".toEndPoint(), method = Methods.GET)
+            ).getString("created_by")
+        )
     }
 
     @Test
@@ -109,6 +122,6 @@ class BitlyTest {
 
     @Test
     fun `clicks summary`() {
-        assertNotEquals(Constants.EMPTY, bitly.bitlinks().Clicks().summary(shortUrl))
+        assertNotEquals(Constants.EMPTY, bitly.bitlinks().clicks(shortUrl))
     }
 }