diff --git a/ctxpy/base.py b/ctxpy/base.py
index 7a350d8..57ae94c 100644
--- a/ctxpy/base.py
+++ b/ctxpy/base.py
@@ -1,34 +1,34 @@
 import json
 import warnings
 from pathlib import Path
-from typing import Optional, Union, Iterable
+from typing import Iterable, Optional, Union
+from urllib.parse import quote
 
 import pandas as pd
 import requests
-from urllib.parse import quote
 
-from .utils import read_env, chunker
+from .utils import chunker, read_env
 
 
 class CTXConnection:
     """
     Connection that passes API key and other variables needed for GET and POST calls to
     API server.
-    
+
     Parameters
     ----------
     x_api_key : str or None, default None
         A user's API key provided to them for accessing CCTE's APIs. Will use value
         provided in .env file if no key is provided.
     env_path : str or None, default None
-        The .env file location. Will default to a user's home directory if no value is 
+        The .env file location. Will default to a user's home directory if no value is
         provided.
-        
+
     Attributes
     ----------
     headers : dict
         A dictionary of information used to make an API call
-        
+
     Methods
     -------
     get
@@ -37,38 +37,39 @@ class CTXConnection:
         send data to resource and then retrieve information based on that data
 
     """
+
     def __init__(
         self,
         x_api_key: Optional[str] = None,
         env_path: Optional[Union[str, Path]] = None,
     ):
         if isinstance(x_api_key, str):
-            self.host = "https://api-ccte.epa.gov/"
+            self.host = "https://comptox.epa.gov/ctx-api/"
             self.headers = {"accept": "application/json", "x-api-key": x_api_key}
 
         else:
             config = read_env()
             self.host = config["ctx_api_host"]
-            self.headers = {"accept":config['ctx_api_accept'],
-                            "x-api-key":config['ctx_api_x_api_key']}
+            self.headers = {
+                "accept": config["ctx_api_accept"],
+                "x-api-key": config["ctx_api_x_api_key"],
+            }
 
     def get(self, suffix: str):
         """
         Request informaiton via API call
-        
+
         Paramters
         ---------
         suffix : string
             the suffix of the API call that will determine what is searched for and how
-        
+
         Returns
         -------
         dict, JSON information that was requested in the API call
         """
         try:
-            self.response = requests.get(
-                f"{self.host}{suffix}", headers=self.headers
-            )
+            self.response = requests.get(f"{self.host}{suffix}", headers=self.headers)
         except Exception as e:
             ## TODO: make this a more informative error message
             raise SystemError(e)
@@ -84,7 +85,7 @@ def post(self, suffix: str, word: str):
         """
         Request information via API call, but also supply stipulations on subsets or
         specific aspects of returned information
-        
+
         Paramters
         ---------
         suffix : string
@@ -113,8 +114,10 @@ def post(self, suffix: str, word: str):
             raise SystemError(e)
 
         return info
-    
-    def batch(self, suffix: str, word: Iterable[str], batch_size: int, bracketed:bool = False):
+
+    def batch(
+        self, suffix: str, word: Iterable[str], batch_size: int, bracketed: bool = False
+    ):
         """
         There are some inconsistencies in how to provide 'batch' data to the API.
         Sometimes the list of identifiers needs to be a bracketed list, other times it
@@ -127,7 +130,7 @@ def batch(self, suffix: str, word: Iterable[str], batch_size: int, bracketed:boo
 
         chunks = []
         for chunk in chunker(word, batch_size):
-            
+
             if bracketed:
                 ## '["DTXSID001", "DTXSID002"]'
                 words = [quote(w, safe="") for w in chunk]
@@ -138,26 +141,26 @@ def batch(self, suffix: str, word: Iterable[str], batch_size: int, bracketed:boo
 
             ## TODO: Check that suffix is re-written on each loop,
             ## not appended to
-            chunks.extend(self.post(suffix = suffix, word=words))
+            chunks.extend(self.post(suffix=suffix, word=words))
         return chunks
 
 
-
 class HCDConnection:
     """
-    Connection to the Hazard Comparison Dashboard APIs, no API key is needed, only GET 
+    Connection to the Hazard Comparison Dashboard APIs, no API key is needed, only GET
     calls are allowed to the API server.
-    
 
-        
+
+
     Methods
     -------
     get
         request information from specified source using information in header
 
     """
+
     def __init__(self):
-        
+
         self.host = "https://hcd.rtpnc.epa.gov/api/"
         self.descriptors = "descriptors?type=toxprints&smiles="
         self.headers = "&headers=TRUE"
@@ -165,12 +168,12 @@ def __init__(self):
     def get(self, smiles: str):
         """
         Request informaiton via API call
-        
+
         Paramters
         ---------
         smiles : string
             the suffix of the API call that will determine what is searched for and how
-        
+
         Returns
         -------
         dict, JSON information that was requested in the API call
@@ -178,10 +181,12 @@ def get(self, smiles: str):
         word = quote(smiles, safe="")
         try:
             with warnings.catch_warnings():
-                warnings.filterwarnings("ignore",category=requests.urllib3.connectionpool.InsecureRequestWarning)
+                warnings.filterwarnings(
+                    "ignore",
+                    category=requests.urllib3.connectionpool.InsecureRequestWarning,
+                )
                 self.response = requests.get(
-                    f"{self.host}{self.descriptors}{word}{self.headers}",
-                    verify = False
+                    f"{self.host}{self.descriptors}{word}{self.headers}", verify=False
                 )
         except Exception as e:
             ## TODO: make this a more informative error message
@@ -192,9 +197,9 @@ def get(self, smiles: str):
         except json.JSONDecodeError as e:
             ## TODO: make this a more informative error message
             raise SystemError(e)
-        if 'descriptors' not in info['chemicals'][0].keys():
+        if "descriptors" not in info["chemicals"][0].keys():
             info = None
         else:
-            info = info['chemicals'][0]['descriptors']
+            info = info["chemicals"][0]["descriptors"]
 
         return info