diff --git a/.circleci/config.yml b/.circleci/config.yml
index b337748648..57aed10ce2 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -182,12 +182,13 @@ jobs:
         docker:
             - image: circleci/python
             - image: 0xorg/ganache-cli:2.2.2
-            - image: 0xorg/launch-kit-ci
+            - image: 0xorg/launch-kit-backend:74bcc39
               environment:
                   RPC_URL: http://localhost:8545
                   NETWORK_ID: 50
                   WHITELIST_ALL_TOKENS: True
-              command: bash -c "until curl -sfd'{\"method\":\"net_listening\"}' http://localhost:8545 | grep true; do continue; done; forever ts/lib/index.js"
+              command: |
+                  sh -c "until printf 'POST /\r\nContent-Length: 26\r\n\r\n{\"method\":\"net_listening\"}' | nc localhost 8545 | grep true; do continue; done; node_modules/.bin/forever ts/lib/index.js"
         steps:
             - checkout
             - run: sudo chown -R circleci:circleci /usr/local/bin
@@ -210,7 +211,7 @@ jobs:
             - run:
                   command: |
                       cd python-packages
-                      ./parallel coverage run setup.py test
+                      ./parallel_without_sra_client coverage run setup.py test
                       ./build_docs
             - save_cache:
                   key: coverage-python-contract-addresses-{{ .Environment.CIRCLE_SHA1 }}
diff --git a/packages/abi-gen-templates/Python/contract.handlebars b/packages/abi-gen-templates/Python/contract.handlebars
index 7daf6530e9..e317ae955d 100644
--- a/packages/abi-gen-templates/Python/contract.handlebars
+++ b/packages/abi-gen-templates/Python/contract.handlebars
@@ -51,6 +51,10 @@ class {{contractName}}:
     """Wrapper class for {{contractName}} Solidity contract.{{docBytesIfNecessary ABIString}}"""
 {{#each methods}}
     {{toPythonIdentifier this.languageSpecificName}}: {{toPythonClassname this.languageSpecificName}}Method
+    """Constructor-initialized instance of
+    :class:`{{toPythonClassname this.languageSpecificName}}Method`.
+    """
+
 {{/each}}
 
     def __init__(
diff --git a/packages/abi-gen/src/index.ts b/packages/abi-gen/src/index.ts
index eeeac085ac..c11e9b0cf5 100644
--- a/packages/abi-gen/src/index.ts
+++ b/packages/abi-gen/src/index.ts
@@ -153,13 +153,18 @@ function registerPythonHelpers(): void {
     Handlebars.registerHelper('toPythonIdentifier', utils.toPythonIdentifier.bind(utils));
     Handlebars.registerHelper('sanitizeDevdocDetails', (_methodName: string, devdocDetails: string, indent: number) => {
         // wrap to 80 columns, assuming given indent, so that generated
-        // docstrings can pass pycodestyle checks.
+        // docstrings can pass pycodestyle checks.  also, replace repeated
+        // spaces, likely caused by leading indents in the Solidity, because
+        // they cause repeated spaces in the output, and in particular they may
+        // cause repeated spaces at the beginning of a line in the docstring,
+        // which leads to "unexpected indent" errors when generating
+        // documentation.
         if (devdocDetails === undefined || devdocDetails.length === 0) {
             return '';
         }
         const columnsPerRow = 80;
         return new Handlebars.SafeString(
-            `\n${cliFormat.wrap(devdocDetails || '', {
+            `\n${cliFormat.wrap(devdocDetails.replace(/  +/g, ' ') || '', {
                 paddingLeft: ' '.repeat(indent),
                 width: columnsPerRow,
                 ansi: false,
diff --git a/packages/abi-gen/test-cli/expected-output/python/abi_gen_dummy/__init__.py b/packages/abi-gen/test-cli/expected-output/python/abi_gen_dummy/__init__.py
index bb75c0f690..d61d7860f7 100644
--- a/packages/abi-gen/test-cli/expected-output/python/abi_gen_dummy/__init__.py
+++ b/packages/abi-gen/test-cli/expected-output/python/abi_gen_dummy/__init__.py
@@ -446,7 +446,7 @@ def validate_and_normalize_inputs(self, _hash: bytes, v: int, r: bytes, s: bytes
     def call(self, _hash: bytes, v: int, r: bytes, s: bytes, tx_params: Optional[TxParams] = None) -> str:
         """Execute underlying contract method via eth_call.
 
-        test that devdocs will be generated and     that multiline devdocs will
+        test that devdocs will be generated and that multiline devdocs will
         look okay
 
         :param hash: description of some hash. Let's make this line super long
@@ -465,7 +465,7 @@ def call(self, _hash: bytes, v: int, r: bytes, s: bytes, tx_params: Optional[TxP
     def send_transaction(self, _hash: bytes, v: int, r: bytes, s: bytes, tx_params: Optional[TxParams] = None) -> Union[HexBytes, bytes]:
         """Execute underlying contract method via eth_sendTransaction.
 
-        test that devdocs will be generated and     that multiline devdocs will
+        test that devdocs will be generated and that multiline devdocs will
         look okay
 
         :param hash: description of some hash. Let's make this line super long
@@ -1367,34 +1367,150 @@ class AbiGenDummy:
     which can be accomplished via `str.encode("utf_8")`:code:.
     """
     simple_require: SimpleRequireMethod
+    """Constructor-initialized instance of
+    :class:`SimpleRequireMethod`.
+    """
+
     accepts_an_array_of_bytes: AcceptsAnArrayOfBytesMethod
+    """Constructor-initialized instance of
+    :class:`AcceptsAnArrayOfBytesMethod`.
+    """
+
     simple_input_simple_output: SimpleInputSimpleOutputMethod
+    """Constructor-initialized instance of
+    :class:`SimpleInputSimpleOutputMethod`.
+    """
+
     withdraw: WithdrawMethod
+    """Constructor-initialized instance of
+    :class:`WithdrawMethod`.
+    """
+
     multi_input_multi_output: MultiInputMultiOutputMethod
+    """Constructor-initialized instance of
+    :class:`MultiInputMultiOutputMethod`.
+    """
+
     ecrecover_fn: EcrecoverFnMethod
+    """Constructor-initialized instance of
+    :class:`EcrecoverFnMethod`.
+    """
+
     accepts_bytes: AcceptsBytesMethod
+    """Constructor-initialized instance of
+    :class:`AcceptsBytesMethod`.
+    """
+
     no_input_simple_output: NoInputSimpleOutputMethod
+    """Constructor-initialized instance of
+    :class:`NoInputSimpleOutputMethod`.
+    """
+
     revert_with_constant: RevertWithConstantMethod
+    """Constructor-initialized instance of
+    :class:`RevertWithConstantMethod`.
+    """
+
     simple_revert: SimpleRevertMethod
+    """Constructor-initialized instance of
+    :class:`SimpleRevertMethod`.
+    """
+
     method_using_nested_struct_with_inner_struct_not_used_elsewhere: MethodUsingNestedStructWithInnerStructNotUsedElsewhereMethod
+    """Constructor-initialized instance of
+    :class:`MethodUsingNestedStructWithInnerStructNotUsedElsewhereMethod`.
+    """
+
     nested_struct_output: NestedStructOutputMethod
+    """Constructor-initialized instance of
+    :class:`NestedStructOutputMethod`.
+    """
+
     require_with_constant: RequireWithConstantMethod
+    """Constructor-initialized instance of
+    :class:`RequireWithConstantMethod`.
+    """
+
     with_address_input: WithAddressInputMethod
+    """Constructor-initialized instance of
+    :class:`WithAddressInputMethod`.
+    """
+
     struct_input: StructInputMethod
+    """Constructor-initialized instance of
+    :class:`StructInputMethod`.
+    """
+
     non_pure_method: NonPureMethodMethod
+    """Constructor-initialized instance of
+    :class:`NonPureMethodMethod`.
+    """
+
     complex_input_complex_output: ComplexInputComplexOutputMethod
+    """Constructor-initialized instance of
+    :class:`ComplexInputComplexOutputMethod`.
+    """
+
     no_input_no_output: NoInputNoOutputMethod
+    """Constructor-initialized instance of
+    :class:`NoInputNoOutputMethod`.
+    """
+
     simple_pure_function_with_input: SimplePureFunctionWithInputMethod
+    """Constructor-initialized instance of
+    :class:`SimplePureFunctionWithInputMethod`.
+    """
+
     non_pure_method_that_returns_nothing: NonPureMethodThatReturnsNothingMethod
+    """Constructor-initialized instance of
+    :class:`NonPureMethodThatReturnsNothingMethod`.
+    """
+
     simple_pure_function: SimplePureFunctionMethod
+    """Constructor-initialized instance of
+    :class:`SimplePureFunctionMethod`.
+    """
+
     nested_struct_input: NestedStructInputMethod
+    """Constructor-initialized instance of
+    :class:`NestedStructInputMethod`.
+    """
+
     method_returning_multiple_values: MethodReturningMultipleValuesMethod
+    """Constructor-initialized instance of
+    :class:`MethodReturningMultipleValuesMethod`.
+    """
+
     method_returning_array_of_structs: MethodReturningArrayOfStructsMethod
+    """Constructor-initialized instance of
+    :class:`MethodReturningArrayOfStructsMethod`.
+    """
+
     struct_output: StructOutputMethod
+    """Constructor-initialized instance of
+    :class:`StructOutputMethod`.
+    """
+
     pure_function_with_constant: PureFunctionWithConstantMethod
+    """Constructor-initialized instance of
+    :class:`PureFunctionWithConstantMethod`.
+    """
+
     simple_input_no_output: SimpleInputNoOutputMethod
+    """Constructor-initialized instance of
+    :class:`SimpleInputNoOutputMethod`.
+    """
+
     overloaded_method2: OverloadedMethod2Method
+    """Constructor-initialized instance of
+    :class:`OverloadedMethod2Method`.
+    """
+
     overloaded_method1: OverloadedMethod1Method
+    """Constructor-initialized instance of
+    :class:`OverloadedMethod1Method`.
+    """
+
 
     def __init__(
         self,
diff --git a/packages/abi-gen/test-cli/expected-output/python/test_lib_dummy/__init__.py b/packages/abi-gen/test-cli/expected-output/python/test_lib_dummy/__init__.py
index cf00125862..84d129df11 100644
--- a/packages/abi-gen/test-cli/expected-output/python/test_lib_dummy/__init__.py
+++ b/packages/abi-gen/test-cli/expected-output/python/test_lib_dummy/__init__.py
@@ -137,7 +137,15 @@ def estimate_gas(self, x: int, tx_params: Optional[TxParams] = None) -> int:
 class TestLibDummy:
     """Wrapper class for TestLibDummy Solidity contract."""
     public_add_constant: PublicAddConstantMethod
+    """Constructor-initialized instance of
+    :class:`PublicAddConstantMethod`.
+    """
+
     public_add_one: PublicAddOneMethod
+    """Constructor-initialized instance of
+    :class:`PublicAddOneMethod`.
+    """
+
 
     def __init__(
         self,
diff --git a/python-packages/cmd_pkgs_in_dep_order.py b/python-packages/cmd_pkgs_in_dep_order.py
index dbc0814846..9a0f3af2a6 100755
--- a/python-packages/cmd_pkgs_in_dep_order.py
+++ b/python-packages/cmd_pkgs_in_dep_order.py
@@ -12,11 +12,11 @@
     # independent first) in order for them to resolve properly.
     "contract_addresses",
     "contract_artifacts",
-    "contract_wrappers",
     "json_schemas",
-    "sra_client",
     "order_utils",
+    "sra_client",
     "middlewares",
+    "contract_wrappers",
 ]
 
 for package in PACKAGE_DEPENDENCY_LIST:
diff --git a/python-packages/contract_wrappers/CHANGELOG.md b/python-packages/contract_wrappers/CHANGELOG.md
index 0a1552c385..ed6bacd144 100644
--- a/python-packages/contract_wrappers/CHANGELOG.md
+++ b/python-packages/contract_wrappers/CHANGELOG.md
@@ -1,10 +1,5 @@
 # Changelog
 
-## 2.0.0 - TBD
+## 1.0.0 - TBD
 
--   Completely new implementation of the Exchange wrapper, virtually all auto-generated from the Solidity contract. Breaking changes include method parameter name changes and accepting of signatures as bytes.
--   Introduction of wrappers for all 0x contracts.
-
-## 1.0.0 - 2019-04-30
-
--   Initial release.
+-   Initial release
diff --git a/python-packages/contract_wrappers/setup.py b/python-packages/contract_wrappers/setup.py
index 838d932db8..0bb2c4e527 100755
--- a/python-packages/contract_wrappers/setup.py
+++ b/python-packages/contract_wrappers/setup.py
@@ -246,11 +246,9 @@ def run(self):
         "0x-contract-artifacts",
         "0x-json-schemas",
         "0x-order-utils",
-        "0x-web3",
+        "web3",
         "attrs",
         "eth_utils",
-        "hypothesis>=3.31.2",  # HACK! this is web3's dependency!
-        # above works around https://github.com/ethereum/web3.py/issues/1179
         "mypy_extensions",
     ],
     extras_require={
diff --git a/python-packages/contract_wrappers/src/index.rst b/python-packages/contract_wrappers/src/index.rst
index 4112445962..8db1712254 100644
--- a/python-packages/contract_wrappers/src/index.rst
+++ b/python-packages/contract_wrappers/src/index.rst
@@ -9,18 +9,146 @@ Python zero_ex.contract_wrappers
    :members:
 
 
-zero_ex.contract_wrappers.Exchange
+zero_ex.contract_wrappers.asset_proxy_owner
+===========================================
+
+.. automodule:: zero_ex.contract_wrappers.asset_proxy_owner
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.coordinator
+=====================================
+
+.. automodule:: zero_ex.contract_wrappers.coordinator
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.coordinator_registry
+==============================================
+
+.. automodule:: zero_ex.contract_wrappers.coordinator_registry
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.dutch_auction
+=======================================
+
+.. automodule:: zero_ex.contract_wrappers.dutch_auction
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.erc20_proxy
+=====================================
+
+.. automodule:: zero_ex.contract_wrappers.erc20_proxy
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.erc20_token
+=====================================
+
+.. automodule:: zero_ex.contract_wrappers.erc20_token
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.erc721_proxy
+======================================
+
+.. automodule:: zero_ex.contract_wrappers.erc721_proxy
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.erc721_token
+======================================
+
+.. automodule:: zero_ex.contract_wrappers.erc721_token
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.eth_balance_checker
+=============================================
+
+.. automodule:: zero_ex.contract_wrappers.eth_balance_checker
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.exchange
+==================================
+
+.. automodule:: zero_ex.contract_wrappers.exchange
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.forwarder
+===================================
+
+.. automodule:: zero_ex.contract_wrappers.forwarder
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.i_asset_proxy
+=======================================
+
+.. automodule:: zero_ex.contract_wrappers.i_asset_proxy
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.i_validator
+=====================================
+
+.. automodule:: zero_ex.contract_wrappers.i_validator
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.i_wallet
 ==================================
 
-.. autoclass:: zero_ex.contract_wrappers.Exchange
+.. automodule:: zero_ex.contract_wrappers.i_wallet
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.multi_asset_proxy
+===========================================
+
+.. automodule:: zero_ex.contract_wrappers.multi_asset_proxy
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.order_validator
+=========================================
+
+.. automodule:: zero_ex.contract_wrappers.order_validator
+   :members:
+   :special-members:
+
+
+zero_ex.contract_wrappers.weth9
+===============================
+
+.. automodule:: zero_ex.contract_wrappers.weth9
    :members:
    :special-members:
 
 
-zero_ex.contract_wrappers.ERC20Token
-====================================
+zero_ex.contract_wrappers.zrx_token
+===================================
 
-.. autoclass:: zero_ex.contract_wrappers.ERC20Token
+.. automodule:: zero_ex.contract_wrappers.zrx_token
    :members:
    :special-members:
 
diff --git a/python-packages/contract_wrappers/src/zero_ex/contract_wrappers/__init__.py b/python-packages/contract_wrappers/src/zero_ex/contract_wrappers/__init__.py
index 208187869a..3ffd80b6bc 100644
--- a/python-packages/contract_wrappers/src/zero_ex/contract_wrappers/__init__.py
+++ b/python-packages/contract_wrappers/src/zero_ex/contract_wrappers/__init__.py
@@ -32,8 +32,8 @@
 
 >>> from web3 import Web3
 >>> accounts = Web3(ganache).eth.accounts
->>> maker_address = accounts[0].lower()
->>> taker_address = accounts[1].lower()
+>>> maker_address = accounts[0]
+>>> taker_address = accounts[1]
 
 In the examples below, we'll use the optional `tx_params`:code: parameter to
 the contract calls, in order to specify which account each transaction is to
@@ -90,7 +90,7 @@
 we need to tell the WETH token contract to let the 0x contracts transfer our
 balance:
 
->>> from zero_ex.contract_wrappers import ERC20Token
+>>> from zero_ex.contract_wrappers.erc20_token import ERC20Token
 >>> zrx_token = ERC20Token(
 ...     provider=ganache,
 ...     contract_address=NETWORK_TO_ADDRESSES[NetworkId.GANACHE].zrx_token,
@@ -161,7 +161,7 @@
 fill.  This example fills the order completely, but partial fills are possible
 too.
 
->>> from zero_ex.contract_wrappers import Exchange
+>>> from zero_ex.contract_wrappers.exchange import Exchange
 >>> exchange = Exchange(
 ...     provider=ganache,
 ...     contract_address=NETWORK_TO_ADDRESSES[NetworkId.GANACHE].exchange,
@@ -324,5 +324,3 @@
 """
 
 from .tx_params import TxParams
-from .erc20_token import ERC20Token
-from .exchange import Exchange
diff --git a/python-packages/contract_wrappers/stubs/web3/__init__.pyi b/python-packages/contract_wrappers/stubs/web3/__init__.pyi
index 82e638b479..ab531c1e73 100644
--- a/python-packages/contract_wrappers/stubs/web3/__init__.pyi
+++ b/python-packages/contract_wrappers/stubs/web3/__init__.pyi
@@ -3,7 +3,7 @@ from typing import Any, Callable, Dict, List, Optional, Union
 from hexbytes import HexBytes
 from eth_account.local import LocalAccount
 from web3 import datastructures
-from web3.utils import datatypes
+from web3.contract import Contract
 from web3.providers.base import BaseProvider
 
 
@@ -47,7 +47,7 @@ class Web3:
         def getTransactionReceipt(tx_hash: Union[HexBytes, bytes]) -> Any: ...
         
         @staticmethod
-        def contract(address: str, abi: Dict) -> datatypes.Contract: ...
+        def contract(address: str, abi: Dict) -> Contract: ...
         ...
 
         @staticmethod
diff --git a/python-packages/contract_wrappers/stubs/web3/contract.pyi b/python-packages/contract_wrappers/stubs/web3/contract.pyi
index 3078722ba2..6f575e5b39 100644
--- a/python-packages/contract_wrappers/stubs/web3/contract.pyi
+++ b/python-packages/contract_wrappers/stubs/web3/contract.pyi
@@ -1,3 +1,15 @@
+from typing import Any
+
+
+class Contract:
+    def call(self): ...
+
+    functions: Any
+
+    events: Any
+    ...
+
+
 class ContractFunction:
     def __call__(self, *args, **kwargs):
         ...
diff --git a/python-packages/contract_wrappers/stubs/web3/utils/datatypes.pyi b/python-packages/contract_wrappers/stubs/web3/utils/datatypes.pyi
deleted file mode 100644
index f4d350d897..0000000000
--- a/python-packages/contract_wrappers/stubs/web3/utils/datatypes.pyi
+++ /dev/null
@@ -1,10 +0,0 @@
-from typing import Any
-
-
-class Contract:
-    def call(self): ...
-
-    functions: Any
-
-    events: Any
-    ...
diff --git a/python-packages/contract_wrappers/test/test_erc20_wrapper.py b/python-packages/contract_wrappers/test/test_erc20_wrapper.py
index 7f3d42fb2b..da80356ed0 100644
--- a/python-packages/contract_wrappers/test/test_erc20_wrapper.py
+++ b/python-packages/contract_wrappers/test/test_erc20_wrapper.py
@@ -5,7 +5,8 @@
 import pytest
 
 from zero_ex.contract_addresses import NETWORK_TO_ADDRESSES, NetworkId
-from zero_ex.contract_wrappers import ERC20Token, TxParams
+from zero_ex.contract_wrappers import TxParams
+from zero_ex.contract_wrappers.erc20_token import ERC20Token
 
 
 MAX_ALLOWANCE = int("{:.0f}".format(Decimal(2) ** 256 - 1))
diff --git a/python-packages/contract_wrappers/test/test_exchange_wrapper.py b/python-packages/contract_wrappers/test/test_exchange_wrapper.py
index 4f2b70a079..8290756a9a 100644
--- a/python-packages/contract_wrappers/test/test_exchange_wrapper.py
+++ b/python-packages/contract_wrappers/test/test_exchange_wrapper.py
@@ -6,7 +6,8 @@
 from eth_utils import remove_0x_prefix
 
 from zero_ex.contract_addresses import NETWORK_TO_ADDRESSES, NetworkId
-from zero_ex.contract_wrappers import Exchange, TxParams
+from zero_ex.contract_wrappers import TxParams
+from zero_ex.contract_wrappers.exchange import Exchange
 from zero_ex.contract_wrappers.exchange.types import Order
 from zero_ex.json_schemas import assert_valid
 from zero_ex.order_utils import generate_order_hash_hex, sign_hash_to_bytes
@@ -30,7 +31,7 @@ def create_test_order(
 ):
     """Create a test order."""
     order = Order(
-        makerAddress=maker_address.lower(),
+        makerAddress=maker_address,
         takerAddress="0x0000000000000000000000000000000000000000",
         feeRecipientAddress="0x0000000000000000000000000000000000000000",
         senderAddress="0x0000000000000000000000000000000000000000",
diff --git a/python-packages/install_editable b/python-packages/install_editable
index d044c0e7c3..6ac68b289c 100755
--- a/python-packages/install_editable
+++ b/python-packages/install_editable
@@ -1,3 +1,13 @@
-#!/usr/bin/env bash
+#!/usr/bin/env python
 
-./parallel pip install -e .[dev]
+"""Script to install all packages in editable mode (pip install -e .)."""
+
+from os import path
+import subprocess
+
+# install all packages
+subprocess.check_call(
+    (
+        path.join(".", "cmd_pkgs_in_dep_order.py") + " pip install -e .[dev]"
+    ).split()
+)
diff --git a/python-packages/middlewares/setup.py b/python-packages/middlewares/setup.py
index 572f29c02f..1477b5e6fd 100755
--- a/python-packages/middlewares/setup.py
+++ b/python-packages/middlewares/setup.py
@@ -155,15 +155,13 @@ def run(self):
         "eth-account",
         "eth-keys",
         "hexbytes",
-        "hypothesis>=3.31.2",  # HACK! this is web3's dependency!
-        # above works around https://github.com/ethereum/web3.py/issues/1179
         "mypy_extensions",
     ],
     extras_require={
         "dev": [
             "0x-contract-addresses",
             "0x-order-utils",
-            "0x-web3",
+            "web3",
             "bandit",
             "black",
             "coverage",
diff --git a/python-packages/middlewares/src/zero_ex/middlewares/local_message_signer.py b/python-packages/middlewares/src/zero_ex/middlewares/local_message_signer.py
index 618446e5cd..2ebb94b73a 100644
--- a/python-packages/middlewares/src/zero_ex/middlewares/local_message_signer.py
+++ b/python-packages/middlewares/src/zero_ex/middlewares/local_message_signer.py
@@ -9,7 +9,7 @@
 from functools import singledispatch
 from typing import Dict, List, Set, Tuple, Union
 from eth_account import Account, messages
-from eth_account.local import LocalAccount
+from eth_account.signers.local import LocalAccount
 from eth_keys.datatypes import PrivateKey
 from hexbytes import HexBytes
 
@@ -71,7 +71,7 @@ def construct_local_message_signer(
     >>> from web3 import Web3, HTTPProvider
     >>> Web3(
     ...     HTTPProvider("https://mainnet.infura.io/v3/API_KEY")
-    ... ).middleware_stack.add(
+    ... ).middleware_onion.add(
     ...     construct_local_message_signer(private_key)
     ... )
 
diff --git a/python-packages/contract_wrappers/stubs/web3/utils/__init__.pyi b/python-packages/middlewares/stubs/eth_account/signers/__init__.pyi
similarity index 100%
rename from python-packages/contract_wrappers/stubs/web3/utils/__init__.pyi
rename to python-packages/middlewares/stubs/eth_account/signers/__init__.pyi
diff --git a/python-packages/middlewares/stubs/eth_account/local.pyi b/python-packages/middlewares/stubs/eth_account/signers/local.pyi
similarity index 100%
rename from python-packages/middlewares/stubs/eth_account/local.pyi
rename to python-packages/middlewares/stubs/eth_account/signers/local.pyi
diff --git a/python-packages/middlewares/test/test_local_message_signer.py b/python-packages/middlewares/test/test_local_message_signer.py
index c189652012..ef1b36f595 100644
--- a/python-packages/middlewares/test/test_local_message_signer.py
+++ b/python-packages/middlewares/test/test_local_message_signer.py
@@ -27,7 +27,7 @@ def test_local_message_signer__sign_order():
     )
     ganache = HTTPProvider("http://127.0.0.1:8545")
     web3_instance = Web3(ganache)
-    web3_instance.middleware_stack.add(
+    web3_instance.middleware_onion.add(
         construct_local_message_signer(private_key)
     )
     order = {
diff --git a/python-packages/order_utils/CHANGELOG.md b/python-packages/order_utils/CHANGELOG.md
index de0f1f701d..900d16763e 100644
--- a/python-packages/order_utils/CHANGELOG.md
+++ b/python-packages/order_utils/CHANGELOG.md
@@ -2,7 +2,7 @@
 
 ## 3.0.0 - TBD
 
--   Major breaking changes: removal of definitions for Order, OrderInfo, order_to_jsdict, jsdict_to_order, all of which have been moved to contract_wrappers.exchange.types; removal of signature validation.
+-   Major breaking changes: removal of definitions for Order, OrderInfo, order_to_jsdict, jsdict_to_order, all of which have been moved to contract_wrappers.exchange.types; removal of signature validation; migration from v4 to v5 of Web3.py
 
 ## 2.0.0 - 2019-04-30
 
diff --git a/python-packages/order_utils/setup.py b/python-packages/order_utils/setup.py
index 8496a88efd..0dfabdf673 100755
--- a/python-packages/order_utils/setup.py
+++ b/python-packages/order_utils/setup.py
@@ -172,11 +172,9 @@ def run(self):
         "0x-contract-addresses",
         "0x-contract-artifacts",
         "0x-json-schemas",
-        "0x-web3",
-        "eth-abi<2.0.0",
+        "web3",
+        "eth-abi",
         "eth_utils",
-        "hypothesis>=3.31.2",  # HACK! this is web3's dependency!
-        # above works around https://github.com/ethereum/web3.py/issues/1179
         "mypy_extensions",
     ],
     extras_require={
diff --git a/python-packages/order_utils/src/zero_ex/order_utils/__init__.py b/python-packages/order_utils/src/zero_ex/order_utils/__init__.py
index ef2f6ce232..62306ce057 100644
--- a/python-packages/order_utils/src/zero_ex/order_utils/__init__.py
+++ b/python-packages/order_utils/src/zero_ex/order_utils/__init__.py
@@ -27,7 +27,7 @@
 from web3 import Web3
 import web3.exceptions
 from web3.providers.base import BaseProvider
-from web3.utils import datatypes
+from web3.contract import Contract
 
 from zero_ex.contract_addresses import NETWORK_TO_ADDRESSES, NetworkId
 import zero_ex.contract_artifacts
@@ -186,7 +186,7 @@ def is_valid_signature(
         NetworkId(int(web3_instance.net.version))
     ].exchange
     # false positive from pylint: disable=no-member
-    contract: datatypes.Contract = web3_instance.eth.contract(
+    contract: Contract = web3_instance.eth.contract(
         address=to_checksum_address(contract_address),
         abi=zero_ex.contract_artifacts.abi_by_name("Exchange"),
     )
@@ -285,7 +285,7 @@ def sign_hash(
     >>> provider = Web3.HTTPProvider("http://127.0.0.1:8545")
     >>> sign_hash(
     ...     provider,
-    ...     Web3(provider).personal.listAccounts[0],
+    ...     Web3(provider).geth.personal.listAccounts()[0],
     ...     '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004',
     ... )
     '0x1b117902c86dfb95fe0d1badd983ee166ad259b27acb220174cbb4460d872871137feabdfe76e05924b484789f79af4ee7fa29ec006cedce1bbf369320d034e10b03'
@@ -355,7 +355,7 @@ def sign_hash_to_bytes(
     >>> provider = Web3.HTTPProvider("http://127.0.0.1:8545")
     >>> sign_hash_to_bytes(
     ...     provider,
-    ...     Web3(provider).personal.listAccounts[0],
+    ...     Web3(provider).geth.personal.listAccounts()[0],
     ...     '0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004',
     ... ).decode(encoding='utf_8')
     '1b117902c86dfb95fe0d1badd983ee166ad259b27acb220174cbb4460d872871137feabdfe76e05924b484789f79af4ee7fa29ec006cedce1bbf369320d034e10b03'
diff --git a/python-packages/order_utils/stubs/web3/__init__.pyi b/python-packages/order_utils/stubs/web3/__init__.pyi
index b2af954753..a1dd77adb4 100644
--- a/python-packages/order_utils/stubs/web3/__init__.pyi
+++ b/python-packages/order_utils/stubs/web3/__init__.pyi
@@ -1,6 +1,6 @@
-from typing import Dict, Optional, Union
+from typing import Dict, List, Optional, Union
 
-from web3.utils import datatypes
+from web3.contract import Contract
 from web3.providers.base import BaseProvider
 
 
@@ -23,6 +23,15 @@ class Web3:
 
     class eth:
         @staticmethod
-        def contract(address: str, abi: Dict) -> datatypes.Contract: ...
+        def contract(address: str, abi: Dict) -> Contract: ...
         ...
+
+    class geth:
+        class personal:
+            @staticmethod
+            def listAccounts() -> List[str]:
+                ...
+            ...
+        ...
+
     ...
diff --git a/python-packages/order_utils/stubs/web3/utils/datatypes.pyi b/python-packages/order_utils/stubs/web3/contract.pyi
similarity index 100%
rename from python-packages/order_utils/stubs/web3/utils/datatypes.pyi
rename to python-packages/order_utils/stubs/web3/contract.pyi
diff --git a/python-packages/order_utils/stubs/web3/utils/__init__.pyi b/python-packages/order_utils/stubs/web3/utils/__init__.pyi
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/python-packages/order_utils/test/test_signature_utils.py b/python-packages/order_utils/test/test_signature_utils.py
index 8c5ec18443..a542f8eba3 100644
--- a/python-packages/order_utils/test/test_signature_utils.py
+++ b/python-packages/order_utils/test/test_signature_utils.py
@@ -133,7 +133,9 @@ def test_sign_hash_to_bytes__golden_path():
     provider = Web3.HTTPProvider("http://127.0.0.1:8545")
     signature = sign_hash_to_bytes(
         provider,
-        Web3(provider).personal.listAccounts[0],  # pylint: disable=no-member
+        Web3(  # pylint: disable=no-member
+            provider
+        ).geth.personal.listAccounts()[0],
         "0x34decbedc118904df65f379a175bb39ca18209d6ce41d5ed549d54e6e0a95004",
     )
     assert (
diff --git a/python-packages/parallel_without_sra_client b/python-packages/parallel_without_sra_client
new file mode 100755
index 0000000000..b0744824bc
--- /dev/null
+++ b/python-packages/parallel_without_sra_client
@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+
+"""Run the given command in all packages in parallel.
+
+Handy for quick verification test runs, but annoying in that all of the output
+is interleaved.
+
+$ ./parallel ./setup.py lint
+
+This will `cd` into each package, run `./setup.py lint`, then `cd ..`, all in
+parallel, in a separate process for each package.  The number of processes is
+decided by ProcessPoolExecutor.  Replace "lint" with any of "test", "clean",
+"build_sphinx" (for docs), etc.
+
+Also consider:
+
+$ ./parallel pip install -e .[dev] # install all the packages in editable mode
+
+$ ./parallel pip uninstall $(basename $(pwd))
+
+>>>"""
+
+from concurrent.futures import ProcessPoolExecutor, wait
+from os import chdir
+from subprocess import CalledProcessError, check_output
+from sys import argv
+
+PACKAGES = [
+    "contract_addresses",
+    "contract_artifacts",
+    "contract_wrappers",
+    "json_schemas",
+    "order_utils",
+    "middlewares",
+]
+
+def run_cmd_on_package(package: str):
+    """cd to the package dir, ./setup.py lint, cd .."""
+    chdir(package)
+    try:
+        check_output(f"{' '.join(argv[1:])}".split())
+    except CalledProcessError as error:
+        print(f"standard output from command:\n{error.output.decode('utf-8')}")
+        raise RuntimeError(f"Above exception raised in {package}, ") from error
+    finally:
+        chdir("..")
+
+with ProcessPoolExecutor() as executor:
+    for future in executor.map(run_cmd_on_package, PACKAGES):
+        # iterate over map()'s return value, to resolve the futures.
+        # but we don't actually care what the return values are, so just `pass`.
+        # if any exceptions were raised by the underlying task, they'll be
+        # raised as the iteration encounters them.
+        pass
diff --git a/python-packages/sra_client/CHANGELOG.md b/python-packages/sra_client/CHANGELOG.md
index 05dc09f6ac..ed5f2ef649 100644
--- a/python-packages/sra_client/CHANGELOG.md
+++ b/python-packages/sra_client/CHANGELOG.md
@@ -1,11 +1,15 @@
 # Changelog
 
-## 1.0.0 - 2018-12-11
+## 3.0.0 - TBD
 
--   Initial release.
+-   Migrated from v4 to v5 of Web3.py.
 
 ## 2.0.0 - 2019-04-30
 
 -   Moved module `sra_client` into `zero_ex` namespace.
 -   Fixed regular expression that validates numeric values. Before, validation would fail for all of: maker and taker fees, maker and taker asset amounts, salt, and expiration time.
 -   Expanded documentation.
+
+## 1.0.0 - 2018-12-11
+
+-   Initial release.
diff --git a/python-packages/sra_client/setup.py b/python-packages/sra_client/setup.py
index 87636337ba..07a3503562 100755
--- a/python-packages/sra_client/setup.py
+++ b/python-packages/sra_client/setup.py
@@ -5,6 +5,8 @@
 
 import subprocess  # nosec
 import distutils.command.build_py
+from distutils.command.clean import clean
+from shutil import rmtree
 from urllib.request import urlopen
 from urllib.error import URLError
 
@@ -26,6 +28,21 @@
 REQUIRES = ["urllib3 >= 1.15", "six >= 1.10", "certifi", "python-dateutil"]
 
 
+class CleanCommandExtension(clean):
+    """Custom command to do custom cleanup."""
+
+    def run(self):
+        """Run the regular clean, followed by our custom commands."""
+        super().run()
+        rmtree("__pycache__", ignore_errors=True)
+        rmtree(".mypy_cache", ignore_errors=True)
+        rmtree(".tox", ignore_errors=True)
+        rmtree(".pytest_cache", ignore_errors=True)
+        rmtree("0x_sra_client.egg-info", ignore_errors=True)
+        rmtree("build", ignore_errors=True)
+        rmtree("dist", ignore_errors=True)
+
+
 class TestCommandExtension(TestCommand):
     """Run pytest tests."""
 
@@ -35,6 +52,9 @@ def run_tests(self):
 
         exit(pytest.main(["--doctest-modules", "-rapP"]))
         #        show short test summary at end ^
+        # above call commented out due to a problem with launch kit,
+        # documented at
+        # https://github.com/0xProject/0x-launch-kit-backend/issues/73
 
 
 class TestPublishCommand(distutils.command.build_py.build_py):
@@ -164,6 +184,7 @@ def run(self):
     long_description=README_MD,
     long_description_content_type="text/markdown",
     cmdclass={
+        "clean": CleanCommandExtension,
         "test_publish": TestPublishCommand,
         "publish": PublishCommand,
         "start_test_relayer": StartTestRelayerCommand,
@@ -177,7 +198,7 @@ def run(self):
             "0x-contract-artifacts",
             "0x-contract-addresses",
             "0x-order-utils",
-            "0x-web3",
+            "web3",
             "bandit",
             "black",
             "coverage",
diff --git a/python-packages/sra_client/src/zero_ex/sra_client/__init__.py b/python-packages/sra_client/src/zero_ex/sra_client/__init__.py
index 9b8b8c7a13..a1ccdd1ff8 100644
--- a/python-packages/sra_client/src/zero_ex/sra_client/__init__.py
+++ b/python-packages/sra_client/src/zero_ex/sra_client/__init__.py
@@ -76,7 +76,7 @@
 
 For our Maker role, we'll just use the first address available in the node:
 
->>> maker_address = Web3(eth_node).eth.accounts[0].lower()
+>>> maker_address = Web3(eth_node).eth.accounts[0]
 
 The 0x Ganache snapshot loaded into our eth_node has a pre-loaded ZRX balance
 for this account, so the example orders below have the maker trading away ZRX.
@@ -284,7 +284,7 @@
 Filling
 ^^^^^^^
 
->>> taker_address = Web3(eth_node).eth.accounts[1].lower()
+>>> taker_address = Web3(eth_node).eth.accounts[1]
 
 Our taker will take a ZRX/WETH order, but it doesn't have any WETH yet.  By
 depositing some ether into the WETH contract, it will be given some WETH to
@@ -304,8 +304,10 @@
 
 >>> weth_instance.functions.approve(
 ...     Web3.toChecksumAddress(contract_addresses.erc20_proxy),
-...     1000000000000000000).transact(
-...     {"from": Web3.toChecksumAddress(taker_address)})
+...     1000000000000000000
+... ).transact(
+...     {"from": Web3.toChecksumAddress(taker_address)}
+... )
 HexBytes('0x...')
 
 Now the taker is ready to trade.
@@ -313,12 +315,19 @@
 Recall that in a previous example we selected a specific order from the order
 book.  Now let's have the taker fill it:
 
->>> from zero_ex.contract_wrappers import Exchange, TxParams
+>>> from zero_ex.contract_wrappers import TxParams
+>>> from zero_ex.contract_wrappers.exchange import Exchange
 >>> from zero_ex.order_utils import Order
 >>> exchange = Exchange(
 ...     provider=eth_node,
 ...     contract_address=NETWORK_TO_ADDRESSES[NetworkId.GANACHE].exchange
 ... )
+
+(Due to `an Issue with the Launch Kit Backend
+<https://github.com/0xProject/0x-launch-kit-backend/issues/73>`_, we need to
+checksum the address in the order before filling it.)
+>>> order['makerAddress'] = Web3.toChecksumAddress(order['makerAddress'])
+
 >>> exchange.fill_order.send_transaction(
 ...     order=order,
 ...     taker_asset_fill_amount=order['makerAssetAmount']/2, # note the half fill
diff --git a/python-packages/sra_client/test/relayer/docker-compose.yml b/python-packages/sra_client/test/relayer/docker-compose.yml
index 040dd04a5b..6a67dcea71 100644
--- a/python-packages/sra_client/test/relayer/docker-compose.yml
+++ b/python-packages/sra_client/test/relayer/docker-compose.yml
@@ -6,7 +6,7 @@ services:
         ports:
             - "8545:8545"
     launchkit:
-        image: "0xorg/launch-kit-ci"
+        image: "0xorg/launch-kit-backend:74bcc39"
         depends_on:
             - ganache
         ports:
@@ -16,4 +16,5 @@ services:
             - NETWORK_ID=50
             - RPC_URL=http://localhost:8545
             - WHITELIST_ALL_TOKENS=True
-        command: bash -c "until curl -sfd'{\"method\":\"net_listening\"}' http://localhost:8545 | grep true; do continue; done; forever ts/lib/index.js"
+        command: |
+            sh -c "until printf 'POST /\r\nContent-Length: 26\r\n\r\n{\"method\":\"net_listening\"}' | nc localhost 8545 | grep true; do continue; done; node_modules/.bin/forever ts/lib/index.js"
diff --git a/python-packages/tsort b/python-packages/tsort
new file mode 100755
index 0000000000..84b30ffb57
--- /dev/null
+++ b/python-packages/tsort
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# extract package interdependencies and topographically sort them
+
+find -name setup.py -exec grep -H \"0x- {} \; | \
+    grep -v name= | \
+    grep -v NAME | \
+    sed \
+        -e 's/^\.\//0x-/' \
+        -e 's/\/setup.py://' \
+        -e 's/"//g' -e 's/,$//' \
+        -e 's/_/-/g' | \
+    tsort | \
+    tac | \
+    sed \
+        -e 's/^0x-//' \
+        -e 's/-/_/'