diff --git a/starknet_devnet/server.py b/starknet_devnet/server.py
index 423c58b66..0b3863694 100644
--- a/starknet_devnet/server.py
+++ b/starknet_devnet/server.py
@@ -9,9 +9,15 @@
 from .util import TxStatus, parse_args
 
 app = Flask(__name__)
+
 address2contract = {}
+"""Maps contract address to contract instance."""
+
 address2types = {}
+"""Maps contract address to a dict of types (structs) used in that contract."""
+
 transactions = []
+"""A chronological list of transactions."""
 
 class StarknetWrapper:
     def __init__(self):
@@ -31,20 +37,29 @@ def is_alive():
     return "Alive!!!"
 
 async def deploy(contract_definition: ContractDefinition):
+    """
+    Deploys the contract whose definition is provided and returns deployment address in hex form.
+    The other returned object is present to conform to a past version of call_or_invoke, but will be removed in future versions.
+    """
+
     starknet = await starknet_wrapper.get_starknet()
     contract = await starknet.deploy(contract_def=contract_definition)
     hex_address = hex(contract.contract_address)
     address2contract[hex_address] = contract
     return hex_address, {}
 
-def attempt_hex(x):
-    try:
-        return hex(x)
-    except:
-        pass
-    return x
+def generate_complex(calldata, calldata_i: int, input_type: str, types):
+    """
+    Converts members of `calldata` to a more complex type specified by `input_type`:
+    - puts members of a struct into a tuple
+    - puts members of a tuple into a tuple
+
+    The `calldata_i` is incremented according to how many `calldata` members were consumed.
+    `types` is a dict that maps a type's name to its specification.
+
+    Returns the `calldata` converted to the type specified by `input_type` (tuple if struct or tuple, number). Also returns the incremented `calldata_i`.
+    """
 
-def generate_complex(calldata, calldata_i, input_type, types):
     if input_type == "felt":
         return calldata[calldata_i], calldata_i + 1
 
@@ -64,6 +79,16 @@ def generate_complex(calldata, calldata_i, input_type, types):
     return tuple(arr), calldata_i
 
 def adapt_calldata(calldata, expected_inputs, types):
+    """
+    Simulatenously iterates over `calldata` and `expected_inputs`.
+
+    The `calldata` is converted to types specified by `expected_inputs`.
+
+    `types` is a dict that maps a type's name to its specification.
+
+    Returns a list representing adapted `calldata`.
+    """
+
     last_name = None
     last_value = None
     calldata_i = 0
@@ -105,6 +130,18 @@ def adapt_calldata(calldata, expected_inputs, types):
     return adapted_calldata
 
 def adapt_output(received, ret):
+    """
+    Adapts the `received` object to format expected by client (list of hex strings).
+    If `received` is an instance of `list`, it is understood that it corresponds to a felt*, so first its length is appended.
+    If `received` is iterable, it is either a struct, a tuple or a felt*.
+    Otherwise it is a `felt`.
+    `ret` is recursively populated (and should probably be empty on first call).
+
+    Example:
+    >>> L = []; adapt_output((1, [5, 10]), L); print(L)
+    ['0x1', '0x2', '0x5', '0xa']
+    """
+
     if isinstance(received, list):
         ret.append(hex(len(received)))
     try:
@@ -148,6 +185,11 @@ def is_transaction_hash_legal(transaction_hash: int) -> bool:
     return 0 <= transaction_hash < len(transactions)
 
 def store_types(contract_address: str, abi):
+    """
+    Stores the types (structs) used in a contract.
+    The types are read from `abi`, and stored to a global map under the key `contract_address` which is expected to be a hex string.
+    """
+
     structs = [x for x in abi if x["type"] == "struct"]
     type_dict = { struct["name"]: struct for struct in structs }
     address2types[contract_address] = type_dict
@@ -171,6 +213,10 @@ def store_transaction(contract_address: str, tx_type: str) -> str:
 
 @app.route("/gateway/add_transaction", methods=["POST"])
 async def add_transaction():
+    """
+    Endpoint for accepting DEPLOY and INVOKE_FUNCTION transactions.
+    """
+
     raw_data = request.get_data()
     transaction = Transaction.loads(raw_data)
     # TODO transaction.calculate_hash()
@@ -207,6 +253,10 @@ def get_contract_addresses():
 
 @app.route("/feeder_gateway/call_contract", methods=["POST"])
 async def call_contract():
+    """
+    Endpoint for receiving calls (not invokes) of contract functions.
+    """
+
     raw_data = request.get_data()
     call_specifications = InvokeFunction.loads(raw_data)
     result_dict = await call_or_invoke("call",
@@ -257,6 +307,10 @@ def get_transaction_status():
 
 @app.route("/feeder_gateway/get_transaction", methods=["GET"])
 def get_transaction():
+    """
+    Returns the transaction identified by the transactionHash argument in the GET request.
+    """
+
     transaction_hash = request.args.get("transactionHash", type=lambda x: int(x, 16))
     if is_transaction_hash_legal(transaction_hash):
         return jsonify(transactions[transaction_hash])
@@ -271,4 +325,4 @@ def main():
     app.run(**vars(args))
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()