diff --git a/common/src/main/kotlin/com/google/ai/client/generativeai/common/APIController.kt b/common/src/main/kotlin/com/google/ai/client/generativeai/common/APIController.kt
index 13cfccc2..757554ce 100644
--- a/common/src/main/kotlin/com/google/ai/client/generativeai/common/APIController.kt
+++ b/common/src/main/kotlin/com/google/ai/client/generativeai/common/APIController.kt
@@ -45,8 +45,6 @@ import kotlinx.coroutines.flow.timeout
 import kotlinx.coroutines.launch
 import kotlinx.serialization.json.Json
 
-const val DOMAIN = "https://generativelanguage.googleapis.com"
-
 val JSON = Json {
   ignoreUnknownKeys = true
   prettyPrint = false
@@ -90,7 +88,7 @@ internal constructor(
   suspend fun generateContent(request: GenerateContentRequest): GenerateContentResponse =
     try {
       client
-        .post("$DOMAIN/${requestOptions.apiVersion}/$model:generateContent") {
+        .post("${requestOptions.endpoint}/${requestOptions.apiVersion}/$model:generateContent") {
           applyCommonConfiguration(request)
         }
         .also { validateResponse(it) }
@@ -103,7 +101,7 @@ internal constructor(
   fun generateContentStream(request: GenerateContentRequest): Flow<GenerateContentResponse> =
     client
       .postStream<GenerateContentResponse>(
-        "$DOMAIN/${requestOptions.apiVersion}/$model:streamGenerateContent?alt=sse"
+        "${requestOptions.endpoint}/${requestOptions.apiVersion}/$model:streamGenerateContent?alt=sse"
       ) {
         applyCommonConfiguration(request)
       }
@@ -113,7 +111,7 @@ internal constructor(
   suspend fun countTokens(request: CountTokensRequest): CountTokensResponse =
     try {
       client
-        .post("$DOMAIN/${requestOptions.apiVersion}/$model:countTokens") {
+        .post("${requestOptions.endpoint}/${requestOptions.apiVersion}/$model:countTokens") {
           applyCommonConfiguration(request)
         }
         .also { validateResponse(it) }
diff --git a/common/src/main/kotlin/com/google/ai/client/generativeai/common/RequestOptions.kt b/common/src/main/kotlin/com/google/ai/client/generativeai/common/RequestOptions.kt
index 82ea8842..4decb5c1 100644
--- a/common/src/main/kotlin/com/google/ai/client/generativeai/common/RequestOptions.kt
+++ b/common/src/main/kotlin/com/google/ai/client/generativeai/common/RequestOptions.kt
@@ -28,13 +28,19 @@ import kotlin.time.toDuration
  *   first response.
  * @property apiVersion the api endpoint to call.
  */
-class RequestOptions(val timeout: Duration, val apiVersion: String = "v1") {
+class RequestOptions(
+  val timeout: Duration,
+  val apiVersion: String = "v1",
+  val endpoint: String = "https://generativelanguage.googleapis.com"
+) {
   @JvmOverloads
   constructor(
     timeout: Long? = HttpTimeout.INFINITE_TIMEOUT_MS,
-    apiVersion: String = "v1"
+    apiVersion: String = "v1",
+    endpoint: String = "https://generativelanguage.googleapis.com"
   ) : this(
     (timeout ?: HttpTimeout.INFINITE_TIMEOUT_MS).toDuration(DurationUnit.MILLISECONDS),
-    apiVersion
+    apiVersion,
+    endpoint
   )
 }
diff --git a/common/src/test/java/com/google/ai/client/generativeai/common/GenerativeModelTests.kt b/common/src/test/java/com/google/ai/client/generativeai/common/APIControllerTests.kt
similarity index 70%
rename from common/src/test/java/com/google/ai/client/generativeai/common/GenerativeModelTests.kt
rename to common/src/test/java/com/google/ai/client/generativeai/common/APIControllerTests.kt
index 6269b673..a05d6d67 100644
--- a/common/src/test/java/com/google/ai/client/generativeai/common/GenerativeModelTests.kt
+++ b/common/src/test/java/com/google/ai/client/generativeai/common/APIControllerTests.kt
@@ -39,7 +39,7 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.junit.runners.Parameterized
 
-internal class GenerativeModelTests {
+internal class APIControllerTests {
   private val testTimeout = 5.seconds
 
   @Test
@@ -69,6 +69,53 @@ internal class GenerativeModelTests {
     }
 }
 
+internal class EndpointTests {
+  @Test
+  fun `using default endpoint`() = doBlocking {
+    val channel = ByteChannel(autoFlush = true)
+    val mockEngine = MockEngine {
+      respond(channel, HttpStatusCode.OK, headersOf(HttpHeaders.ContentType, "application/json"))
+    }
+    prepareStreamingResponse(createResponses("Random")).forEach { channel.writeFully(it) }
+    val controller =
+      APIController("super_cool_test_key", "gemini-pro-1.0", RequestOptions(), mockEngine)
+
+    withTimeout(5.seconds) {
+      controller.generateContentStream(textGenerateContentRequest("cats")).collect {
+        it.candidates?.isEmpty() shouldBe false
+        channel.close()
+      }
+    }
+
+    mockEngine.requestHistory.first().url.host shouldBe "generativelanguage.googleapis.com"
+  }
+
+  @Test
+  fun `using custom endpoint`() = doBlocking {
+    val channel = ByteChannel(autoFlush = true)
+    val mockEngine = MockEngine {
+      respond(channel, HttpStatusCode.OK, headersOf(HttpHeaders.ContentType, "application/json"))
+    }
+    prepareStreamingResponse(createResponses("Random")).forEach { channel.writeFully(it) }
+    val controller =
+      APIController(
+        "super_cool_test_key",
+        "gemini-pro-1.0",
+        RequestOptions(endpoint = "https://my.custom.endpoint"),
+        mockEngine
+      )
+
+    withTimeout(5.seconds) {
+      controller.generateContentStream(textGenerateContentRequest("cats")).collect {
+        it.candidates?.isEmpty() shouldBe false
+        channel.close()
+      }
+    }
+
+    mockEngine.requestHistory.first().url.host shouldBe "my.custom.endpoint"
+  }
+}
+
 @RunWith(Parameterized::class)
 internal class ModelNamingTests(private val modelName: String, private val actualName: String) {
 
diff --git a/generativeai-android-sample/app/build.gradle.kts b/generativeai-android-sample/app/build.gradle.kts
index 9e9fd99f..af5e5f82 100644
--- a/generativeai-android-sample/app/build.gradle.kts
+++ b/generativeai-android-sample/app/build.gradle.kts
@@ -75,5 +75,5 @@ dependencies {
     debugImplementation("androidx.compose.ui:ui-tooling")
     debugImplementation("androidx.compose.ui:ui-test-manifest")
 
-    implementation("com.google.ai.client.generativeai:generativeai:0.2.2")
+    implementation("com.google.ai.client.generativeai:generativeai:0.2.20")
 }
diff --git a/generativeai/gradle.properties b/generativeai/gradle.properties
index f4f46191..fe4af4a0 100644
--- a/generativeai/gradle.properties
+++ b/generativeai/gradle.properties
@@ -1 +1 @@
-version=0.2.2
+version=0.2.20