diff --git a/README.md b/README.md
index 8ace90c..98478f9 100644
--- a/README.md
+++ b/README.md
@@ -277,6 +277,15 @@ export EARNINGSCALL_API_KEY="YOUR-SECRET-API-KEY-GOES-HERE"
 python your-python-script.py
 ```
 
+### Using a Custom API URL
+
+To use a custom API endpoint (e.g., for testing or self-hosted), set the `EARNINGSCALL_API_URL` environment variable:
+
+```sh
+export EARNINGSCALL_API_URL="https://api.earningscall.dev"
+python your-python-script.py
+```
+
 ## List S&P 500 Companies
 
 ```python
diff --git a/earningscall/api.py b/earningscall/api.py
index 8e3ac89..91a2d53 100644
--- a/earningscall/api.py
+++ b/earningscall/api.py
@@ -15,7 +15,8 @@
 log = logging.getLogger(__file__)
 
 DOMAIN = os.environ.get("EARNINGSCALL_DOMAIN", "earningscall.biz")
-API_BASE = f"https://v2.api.{DOMAIN}"
+API_URL = os.environ.get("EARNINGSCALL_API_URL")
+API_BASE = API_URL if API_URL else f"https://v2.api.{DOMAIN}"
 DEFAULT_RETRY_STRATEGY: Dict[str, Union[str, int, float]] = {
     "strategy": "exponential",
     "base_delay": 1,