diff --git a/CHANGELOG.md b/CHANGELOG.md
index 030e2ed..6ac6468 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## [20200320]
+
+  - Move API keys to env var, refs #9
+
 ## [20191108]
 
   - Fix Ropsten 403 errors
diff --git a/README.md b/README.md
index 17700d9..4e9ad8b 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,11 @@ etheroll = Etheroll(chain_id, contract_address)
 
 Find out more in [docs/Examples.md](docs/Examples.md).
 
+## API keys
+Both Etherscan and Infura require API keys which are retrieved from the following environment variables:
+- `ETHERSCAN_API_KEY` (consumed by pyetheroll directly)
+- `WEB3_INFURA_PROJECT_ID` (consumed by [web3.py](https://github.com/ethereum/web3.py))
+
 ## Install
 
 [Latest stable release](https://github.com/AndreMiras/pyetheroll/tree/master):
diff --git a/docs/changelog.rst b/docs/changelog.rst
new file mode 100644
index 0000000..8e1bc1d
--- /dev/null
+++ b/docs/changelog.rst
@@ -0,0 +1,5 @@
+CHANGELOG
+=========
+
+.. mdinclude:: ../CHANGELOG.md
+
diff --git a/docs/index.rst b/docs/index.rst
index e4e3ed0..4dc1037 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -13,6 +13,7 @@ Welcome to pyetheroll's documentation!
    readme.rst
    Examples.md
    Release.md
+   changelog.rst
 
 
 Indices and tables
diff --git a/pyetheroll/constants.py b/pyetheroll/constants.py
index 4217948..48b3a14 100644
--- a/pyetheroll/constants.py
+++ b/pyetheroll/constants.py
@@ -3,7 +3,8 @@
 ROUND_DIGITS = 2
 DEFAULT_GAS_PRICE_GWEI = 4
 DEFAULT_GAS_PRICE_WEI = int(DEFAULT_GAS_PRICE_GWEI * 1e9)
-DEFAULT_API_KEY_TOKEN = "YourApiKeyToken"
+DEFAULT_ETHERSCAN_API_KEY = "YourApiKeyToken"
+DEFAULT_INFURA_PROJECT_ID = "7c841c560b1e4660a9683507cb27b2f8"
 
 
 class ChainID(Enum):
diff --git a/pyetheroll/etheroll.py b/pyetheroll/etheroll.py
index f7e10f2..27fc9db 100644
--- a/pyetheroll/etheroll.py
+++ b/pyetheroll/etheroll.py
@@ -13,12 +13,7 @@
 from web3 import Web3
 from web3.contract import Contract
 
-from pyetheroll.constants import (
-    DEFAULT_API_KEY_TOKEN,
-    DEFAULT_GAS_PRICE_WEI,
-    ROUND_DIGITS,
-    ChainID,
-)
+from pyetheroll.constants import DEFAULT_GAS_PRICE_WEI, ROUND_DIGITS, ChainID
 from pyetheroll.etherscan_utils import (
     ChainEtherscanAccountFactory,
     ChainEtherscanContractFactory,
@@ -27,7 +22,7 @@
     HTTPProviderFactory,
     TransactionDebugger,
 )
-from pyetheroll.utils import timestamp2datetime
+from pyetheroll.utils import get_etherscan_api_key, timestamp2datetime
 
 REQUESTS_CACHE_PARAMS = {
     "cache_name": "requests_cache",
@@ -83,7 +78,6 @@ class Etheroll:
 
     def __init__(
         self,
-        api_key: str = DEFAULT_API_KEY_TOKEN,
         chain_id: ChainID = ChainID.MAINNET,
         contract_address: str = None,
     ):
@@ -96,7 +90,7 @@ def __init__(
         # self.provider = EthereumTesterProvider(ethereum_tester)
         self.provider = HTTPProviderFactory.create(self.chain_id)
         self.web3 = Web3(self.provider)
-        self.etherscan_api_key = api_key
+        self.etherscan_api_key = get_etherscan_api_key()
         ChainEtherscanContract = ChainEtherscanContractFactory.create(
             self.chain_id
         )
@@ -111,7 +105,8 @@ def __init__(
                 address=self.contract_address, api_key=self.etherscan_api_key
             )
             self.etherscan_contract_api.http.headers = update_user_agent(
-                self.etherscan_contract_api.http.headers)
+                self.etherscan_contract_api.http.headers
+            )
             self.contract_abi = json.loads(
                 self.etherscan_contract_api.get_abi()
             )
@@ -130,10 +125,7 @@ def __init__(
 
     @classmethod
     def get_or_create(
-        cls,
-        api_key: str = DEFAULT_API_KEY_TOKEN,
-        chain_id: ChainID = ChainID.MAINNET,
-        contract_address: str = None,
+        cls, chain_id: ChainID = ChainID.MAINNET, contract_address: str = None,
     ):
         """
         Gets or creates the Etheroll object.
@@ -141,11 +133,10 @@ def get_or_create(
         """
         contract_address = contract_address or cls.CONTRACT_ADDRESSES[chain_id]
         if cls._etheroll is None or (
-            cls._etheroll.etherscan_api_key,
             cls._etheroll.chain_id,
             cls._etheroll.contract_address,
-        ) != (api_key, chain_id, contract_address):
-            cls._etheroll = cls(api_key, chain_id, contract_address)
+        ) != (chain_id, contract_address):
+            cls._etheroll = cls(chain_id, contract_address)
         return cls._etheroll
 
     def definitions(self, contract_abi, typ):
@@ -284,7 +275,8 @@ def get_transaction_page(
             address=address, api_key=self.etherscan_api_key
         )
         etherscan_account_api.http.headers = update_user_agent(
-            etherscan_account_api.http.headers)
+            etherscan_account_api.http.headers
+        )
         sort = "desc"
         try:
             transactions = etherscan_account_api.get_transaction_page(
@@ -612,7 +604,8 @@ def get_balance(self, address):
             address=address, api_key=self.etherscan_api_key
         )
         etherscan_account_api.http.headers = update_user_agent(
-            etherscan_account_api.http.headers)
+            etherscan_account_api.http.headers
+        )
         balance_wei = int(etherscan_account_api.get_balance())
         balance_eth = round(balance_wei / 1e18, ROUND_DIGITS)
         return balance_eth
diff --git a/pyetheroll/transaction_debugger.py b/pyetheroll/transaction_debugger.py
index c23abd9..d885257 100644
--- a/pyetheroll/transaction_debugger.py
+++ b/pyetheroll/transaction_debugger.py
@@ -4,8 +4,9 @@
 from eth_utils import decode_hex, function_abi_to_4byte_selector
 from web3 import HTTPProvider, Web3
 
-from pyetheroll.constants import DEFAULT_API_KEY_TOKEN, ChainID
+from pyetheroll.constants import ChainID
 from pyetheroll.etherscan_utils import ChainEtherscanContractFactory
+from pyetheroll.utils import get_etherscan_api_key, get_infura_project_id
 
 
 def decode_contract_call(contract_abi: list, call_data: str):
@@ -30,10 +31,14 @@ class HTTPProviderFactory:
         # ChainID.MAINNET: 'https://api.myetherapi.com/eth',
         # ChainID.MAINNET: 'https://api.infura.io/v1/jsonrpc/mainnet',
         # ChainID.MAINNET: 'https://api.mycryptoapi.com/eth',
-        ChainID.MAINNET: "https://mainnet.infura.io",
+        ChainID.MAINNET: (
+            f"https://mainnet.infura.io/v3/{get_infura_project_id()}"
+        ),
         # ChainID.ROPSTEN: 'https://api.myetherapi.com/rop',
         # ChainID.ROPSTEN: 'https://api.infura.io/v1/jsonrpc/ropsten',
-        ChainID.ROPSTEN: "https://ropsten.infura.io",
+        ChainID.ROPSTEN: (
+            f"https://ropsten.infura.io/v3/{get_infura_project_id()}"
+        ),
     }
 
     @classmethod
@@ -48,13 +53,12 @@ def __init__(self, contract_abi):
         self.methods_infos = None
 
     @staticmethod
-    def get_contract_abi(
-        chain_id, contract_address, api_key: str = DEFAULT_API_KEY_TOKEN
-    ) -> dict:
+    def get_contract_abi(chain_id, contract_address) -> dict:
         """
         Given a contract address returns the contract ABI from Etherscan,
         refs #2
         """
+        api_key = get_etherscan_api_key()
         ChainEtherscanContract = ChainEtherscanContractFactory.create(chain_id)
         api = ChainEtherscanContract(address=contract_address, api_key=api_key)
         json_abi = api.get_abi()
diff --git a/pyetheroll/utils.py b/pyetheroll/utils.py
index 63b62f0..6ede391 100644
--- a/pyetheroll/utils.py
+++ b/pyetheroll/utils.py
@@ -1,6 +1,11 @@
+import os
 from datetime import datetime
 
-from pyetheroll.constants import ROUND_DIGITS
+from pyetheroll.constants import (
+    DEFAULT_ETHERSCAN_API_KEY,
+    DEFAULT_INFURA_PROJECT_ID,
+    ROUND_DIGITS,
+)
 
 
 class EtherollUtils:
@@ -34,3 +39,13 @@ def timestamp2datetime(timestamp: str) -> datetime:
         base = 16
     date_time = datetime.utcfromtimestamp(int(timestamp, base))
     return date_time
+
+
+def get_etherscan_api_key():
+    """Returns ETHERSCAN_API_KEY from environment variable."""
+    return os.environ.get("ETHERSCAN_API_KEY", DEFAULT_ETHERSCAN_API_KEY)
+
+
+def get_infura_project_id():
+    """Returns WEB3_INFURA_PROJECT_ID from environment variable."""
+    return os.environ.get("WEB3_INFURA_PROJECT_ID", DEFAULT_INFURA_PROJECT_ID)
diff --git a/setup.py b/setup.py
index db5e1d8..0689593 100644
--- a/setup.py
+++ b/setup.py
@@ -11,7 +11,7 @@ def read(fname):
 # exposing the params so it can be imported
 setup_params = {
     "name": "pyetheroll",
-    "version": "20191108",
+    "version": "20200320",
     "description": "Python library to Etheroll smart contract",
     "long_description": read("README.md"),
     "long_description_content_type": "text/markdown",
diff --git a/tests/test_etheroll.py b/tests/test_etheroll.py
index f449b5e..5dcf0c6 100644
--- a/tests/test_etheroll.py
+++ b/tests/test_etheroll.py
@@ -624,7 +624,7 @@ def test_get_log_bet_events(self):
             "&topic2=0x"
             "00000000000000000000000046044beaa1e985c67767e04de58181de5daaa00f"
             "&topic0_2_opr=and&",
-            headers={'User-Agent': 'https://github.com/AndreMiras/pyetheroll'},
+            headers={"User-Agent": "https://github.com/AndreMiras/pyetheroll"},
         )
         expected_calls = [expected_call]
         assert m_get.call_args_list == expected_calls
@@ -655,7 +655,7 @@ def test_get_log_result_events(self):
             "&topic3=0x"
             "00000000000000000000000046044beaa1e985c67767e04de58181de5daaa00f"
             "&topic0_3_opr=and&",
-            headers={'User-Agent': 'https://github.com/AndreMiras/pyetheroll'},
+            headers={"User-Agent": "https://github.com/AndreMiras/pyetheroll"},
         )
         expected_calls = [expected_call]
         assert m_get.call_args_list == expected_calls