diff --git a/litellm/tests/test_completion.py b/litellm/tests/test_completion.py
index 60c7d4d9b..f734f7f8f 100644
--- a/litellm/tests/test_completion.py
+++ b/litellm/tests/test_completion.py
@@ -1348,6 +1348,26 @@ def test_completion_fireworks_ai():
         pytest.fail(f"Error occurred: {e}")
 
 
+def test_completion_fireworks_ai_bad_api_base():
+    try:
+        litellm.set_verbose = True
+        messages = [
+            {"role": "system", "content": "You're a good bot"},
+            {
+                "role": "user",
+                "content": "Hey",
+            },
+        ]
+        response = completion(
+            model="fireworks_ai/accounts/fireworks/models/mixtral-8x7b-instruct",
+            messages=messages,
+            api_base="my-bad-api-base",
+        )
+        pytest.fail(f"This call should have failed!")
+    except Exception as e:
+        pass
+
+
 @pytest.mark.skip(reason="this test is flaky")
 def test_completion_perplexity_api():
     try:
diff --git a/litellm/utils.py b/litellm/utils.py
index a73873394..ba77c3f67 100644
--- a/litellm/utils.py
+++ b/litellm/utils.py
@@ -4255,44 +4255,44 @@ def get_llm_provider(
             model = model.split("/", 1)[1]
             if custom_llm_provider == "perplexity":
                 # perplexity is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.perplexity.ai
-                api_base = "https://api.perplexity.ai"
+                api_base = api_base or "https://api.perplexity.ai"
                 dynamic_api_key = get_secret("PERPLEXITYAI_API_KEY")
             elif custom_llm_provider == "anyscale":
                 # anyscale is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.endpoints.anyscale.com/v1
-                api_base = "https://api.endpoints.anyscale.com/v1"
+                api_base = api_base or "https://api.endpoints.anyscale.com/v1"
                 dynamic_api_key = get_secret("ANYSCALE_API_KEY")
             elif custom_llm_provider == "deepinfra":
                 # deepinfra is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.endpoints.anyscale.com/v1
-                api_base = "https://api.deepinfra.com/v1/openai"
+                api_base = api_base or "https://api.deepinfra.com/v1/openai"
                 dynamic_api_key = get_secret("DEEPINFRA_API_KEY")
             elif custom_llm_provider == "empower":
-                api_base = "https://app.empower.dev/api/v1"
+                api_base = api_base or "https://app.empower.dev/api/v1"
                 dynamic_api_key = get_secret("EMPOWER_API_KEY")
             elif custom_llm_provider == "groq":
                 # groq is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.groq.com/openai/v1
-                api_base = "https://api.groq.com/openai/v1"
+                api_base = api_base or "https://api.groq.com/openai/v1"
                 dynamic_api_key = get_secret("GROQ_API_KEY")
             elif custom_llm_provider == "nvidia_nim":
                 # nvidia_nim is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.endpoints.anyscale.com/v1
-                api_base = "https://integrate.api.nvidia.com/v1"
+                api_base = api_base or "https://integrate.api.nvidia.com/v1"
                 dynamic_api_key = get_secret("NVIDIA_NIM_API_KEY")
             elif custom_llm_provider == "volcengine":
                 # volcengine is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.endpoints.anyscale.com/v1
-                api_base = "https://ark.cn-beijing.volces.com/api/v3"
+                api_base = api_base or "https://ark.cn-beijing.volces.com/api/v3"
                 dynamic_api_key = get_secret("VOLCENGINE_API_KEY")
             elif custom_llm_provider == "codestral":
                 # codestral is openai compatible, we just need to set this to custom_openai and have the api_base be https://codestral.mistral.ai/v1
-                api_base = "https://codestral.mistral.ai/v1"
+                api_base = api_base or "https://codestral.mistral.ai/v1"
                 dynamic_api_key = get_secret("CODESTRAL_API_KEY")
             elif custom_llm_provider == "deepseek":
                 # deepseek is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.deepseek.com/v1
-                api_base = "https://api.deepseek.com/v1"
+                api_base = api_base or "https://api.deepseek.com/v1"
                 dynamic_api_key = get_secret("DEEPSEEK_API_KEY")
             elif custom_llm_provider == "fireworks_ai":
                 # fireworks is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.fireworks.ai/inference/v1
                 if not model.startswith("accounts/fireworks/models"):
                     model = f"accounts/fireworks/models/{model}"
-                api_base = "https://api.fireworks.ai/inference/v1"
+                api_base = api_base or "https://api.fireworks.ai/inference/v1"
                 dynamic_api_key = (
                     get_secret("FIREWORKS_API_KEY")
                     or get_secret("FIREWORKS_AI_API_KEY")