diff --git a/Cargo.lock b/Cargo.lock
index 83deaed8..c9c7f975 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -229,7 +229,6 @@ name = "ethers"
 version = "0.1.0"
 dependencies = [
  "anyhow 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethers-abi 0.1.0",
  "ethers-contract 0.1.0",
  "ethers-providers 0.1.0",
  "ethers-signers 0.1.0",
@@ -241,23 +240,10 @@ dependencies = [
  "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "ethers-abi"
-version = "0.1.0"
-dependencies = [
- "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethabi 12.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethers-types 0.1.0",
- "ethers-utils 0.1.0",
- "serde_json 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)",
- "thiserror 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "ethers-contract"
 version = "0.1.0"
 dependencies = [
- "ethers-abi 0.1.0",
  "ethers-contract-abigen 0.1.0",
  "ethers-contract-derive 0.1.0",
  "ethers-providers 0.1.0",
@@ -276,7 +262,6 @@ dependencies = [
  "Inflector 0.11.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "anyhow 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "curl 0.4.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethers-abi 0.1.0",
  "ethers-types 0.1.0",
  "once_cell 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -291,8 +276,8 @@ dependencies = [
 name = "ethers-contract-derive"
 version = "0.1.0"
 dependencies = [
- "ethers-abi 0.1.0",
  "ethers-contract-abigen 0.1.0",
+ "ethers-types 0.1.0",
  "proc-macro2 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.53 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -304,7 +289,6 @@ name = "ethers-providers"
 version = "0.1.0"
 dependencies = [
  "async-trait 0.1.31 (registry+https://github.com/rust-lang/crates.io-index)",
- "ethers-abi 0.1.0",
  "ethers-types 0.1.0",
  "ethers-utils 0.1.0",
  "reqwest 0.10.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -329,7 +313,9 @@ dependencies = [
 name = "ethers-types"
 version = "0.1.0"
 dependencies = [
+ "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "bincode 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ethabi 12.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethereum-types 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "ethers-utils 0.1.0",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index abd2dbb9..d8f202d7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,6 @@
 
 members = [
     "./crates/ethers",
-    "./crates/ethers-abi",
     "./crates/ethers-contract",
     "./crates/ethers-providers",
     "./crates/ethers-signers",
diff --git a/crates/ethers-abi/Cargo.toml b/crates/ethers-abi/Cargo.toml
deleted file mode 100644
index fe43f241..00000000
--- a/crates/ethers-abi/Cargo.toml
+++ /dev/null
@@ -1,16 +0,0 @@
-[package]
-name = "ethers-abi"
-version = "0.1.0"
-authors = ["Georgios Konstantopoulos <me@gakonst.com>"]
-edition = "2018"
-
-[dependencies]
-ethers-types = { version = "0.1.0", path = "../ethers-types" }
-ethers-utils = { version = "0.1.0", path = "../ethers-utils" }
-
-ethabi = "12.0.0"
-arrayvec = "0.5.1"
-thiserror = { version = "1.0.19", default-features = false }
-
-[dev-dependencies]
-serde_json = { version = "1.0.53", default-features = false }
diff --git a/crates/ethers-contract/Cargo.toml b/crates/ethers-contract/Cargo.toml
index 05525f5a..c631f657 100644
--- a/crates/ethers-contract/Cargo.toml
+++ b/crates/ethers-contract/Cargo.toml
@@ -8,7 +8,6 @@ edition = "2018"
 ethers-contract-abigen = { version = "0.1.0", path = "ethers-contract-abigen", optional = true }
 ethers-contract-derive = { version = "0.1.0", path = "ethers-contract-derive", optional = true }
 
-ethers-abi = { version = "0.1.0", path = "../ethers-abi" }
 ethers-providers = { version = "0.1.0", path = "../ethers-providers" }
 ethers-signers = { version = "0.1.0", path = "../ethers-signers" }
 ethers-types = { version = "0.1.0", path = "../ethers-types" }
diff --git a/crates/ethers-contract/ethers-contract-abigen/Cargo.toml b/crates/ethers-contract/ethers-contract-abigen/Cargo.toml
index 34e9e18e..df49456b 100644
--- a/crates/ethers-contract/ethers-contract-abigen/Cargo.toml
+++ b/crates/ethers-contract/ethers-contract-abigen/Cargo.toml
@@ -7,7 +7,6 @@ license = "MIT OR Apache-2.0"
 description = "Code generation for type-safe bindings to Ethereum smart contracts"
 
 [dependencies]
-ethers-abi = { path = "../../ethers-abi" }
 ethers-types = { path = "../../ethers-types" }
 
 anyhow = "1.0"
diff --git a/crates/ethers-contract/ethers-contract-abigen/src/contract.rs b/crates/ethers-contract/ethers-contract-abigen/src/contract.rs
index aed7edd2..80091439 100644
--- a/crates/ethers-contract/ethers-contract-abigen/src/contract.rs
+++ b/crates/ethers-contract/ethers-contract-abigen/src/contract.rs
@@ -12,8 +12,7 @@ mod types;
 use super::util;
 use super::Args;
 use anyhow::{anyhow, Context as _, Result};
-use ethers_abi::Abi;
-use ethers_types::Address;
+use ethers_types::{abi::Abi, Address};
 use inflector::Inflector;
 use proc_macro2::{Ident, Literal, TokenStream};
 use quote::quote;
diff --git a/crates/ethers-contract/ethers-contract-abigen/src/contract/events.rs b/crates/ethers-contract/ethers-contract-abigen/src/contract/events.rs
index fe46656a..a067ac9b 100644
--- a/crates/ethers-contract/ethers-contract-abigen/src/contract/events.rs
+++ b/crates/ethers-contract/ethers-contract-abigen/src/contract/events.rs
@@ -1,5 +1,5 @@
 use super::{types, util, Context};
-use ethers_abi::{Event, EventExt, EventParam, Hash, ParamType};
+use ethers_types::abi::{Event, EventExt, EventParam, Hash, ParamType};
 
 use anyhow::Result;
 use inflector::Inflector;
@@ -286,7 +286,7 @@ fn expand_hash(hash: Hash) -> TokenStream {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use ethers_abi::{EventParam, ParamType};
+    use ethers_types::abi::{EventParam, ParamType};
 
     #[test]
     fn expand_transfer_filter() {
diff --git a/crates/ethers-contract/ethers-contract-abigen/src/contract/methods.rs b/crates/ethers-contract/ethers-contract-abigen/src/contract/methods.rs
index af1e5388..2743a137 100644
--- a/crates/ethers-contract/ethers-contract-abigen/src/contract/methods.rs
+++ b/crates/ethers-contract/ethers-contract-abigen/src/contract/methods.rs
@@ -1,7 +1,8 @@
 use super::{types, util, Context};
-
-use ethers_abi::{Function, FunctionExt, Param};
-use ethers_types::Selector;
+use ethers_types::{
+    abi::{Function, FunctionExt, Param},
+    Selector,
+};
 
 use anyhow::{anyhow, Context as _, Result};
 use inflector::Inflector;
@@ -106,7 +107,7 @@ fn expand_selector(selector: Selector) -> TokenStream {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use ethers_abi::ParamType;
+    use ethers_types::abi::ParamType;
 
     #[test]
     fn expand_inputs_empty() {
diff --git a/crates/ethers-contract/ethers-contract-abigen/src/contract/types.rs b/crates/ethers-contract/ethers-contract-abigen/src/contract/types.rs
index eba64c02..ac8c0307 100644
--- a/crates/ethers-contract/ethers-contract-abigen/src/contract/types.rs
+++ b/crates/ethers-contract/ethers-contract-abigen/src/contract/types.rs
@@ -1,5 +1,5 @@
 use anyhow::{anyhow, Result};
-use ethers_abi::ParamType;
+use ethers_types::abi::ParamType;
 use proc_macro2::{Literal, TokenStream};
 use quote::quote;
 
diff --git a/crates/ethers-contract/ethers-contract-derive/Cargo.toml b/crates/ethers-contract/ethers-contract-derive/Cargo.toml
index 31d8540e..9fbec896 100644
--- a/crates/ethers-contract/ethers-contract-derive/Cargo.toml
+++ b/crates/ethers-contract/ethers-contract-derive/Cargo.toml
@@ -10,7 +10,7 @@ description = "Proc macro for type-safe bindings generation to Ethereum smart co
 proc-macro = true
 
 [dependencies]
-ethers-abi = { path = "../../ethers-abi" }
+ethers-types = { path = "../../ethers-types" }
 ethers-contract-abigen = { path = "../ethers-contract-abigen" }
 
 serde_json = "1.0.53"
diff --git a/crates/ethers-contract/ethers-contract-derive/src/abigen.rs b/crates/ethers-contract/ethers-contract-derive/src/abigen.rs
index afac30f6..99727931 100644
--- a/crates/ethers-contract/ethers-contract-derive/src/abigen.rs
+++ b/crates/ethers-contract/ethers-contract-derive/src/abigen.rs
@@ -2,8 +2,8 @@
 //! ethereum smart contract.
 use crate::spanned::{ParseInner, Spanned};
 
-use ethers_abi::{Function, FunctionExt, Param};
 use ethers_contract_abigen::Builder;
+use ethers_types::abi::{Function, FunctionExt, Param};
 
 use proc_macro2::{Span, TokenStream as TokenStream2};
 use quote::{quote, ToTokens as _};
diff --git a/crates/ethers-contract/src/call.rs b/crates/ethers-contract/src/call.rs
index 9565761c..87476dda 100644
--- a/crates/ethers-contract/src/call.rs
+++ b/crates/ethers-contract/src/call.rs
@@ -1,7 +1,9 @@
-use ethers_abi::{Detokenize, Function};
 use ethers_providers::{networks::Network, JsonRpcClient};
 use ethers_signers::{Client, Signer};
-use ethers_types::{Address, BlockNumber, TransactionRequest, H256, U256};
+use ethers_types::{
+    abi::{Detokenize, Error as AbiError, Function, InvalidOutputType},
+    Address, BlockNumber, TransactionRequest, H256, U256,
+};
 
 use std::{fmt::Debug, marker::PhantomData};
 
@@ -48,9 +50,9 @@ where
     P::Error: 'static,
 {
     #[error(transparent)]
-    DecodingError(#[from] ethers_abi::Error),
+    DecodingError(#[from] AbiError),
     #[error(transparent)]
-    DetokenizationError(#[from] ethers_abi::InvalidOutputType),
+    DetokenizationError(#[from] InvalidOutputType),
     #[error(transparent)]
     CallError(P::Error),
 }
diff --git a/crates/ethers-contract/src/contract.rs b/crates/ethers-contract/src/contract.rs
index 72edf1e0..8d7bfe1e 100644
--- a/crates/ethers-contract/src/contract.rs
+++ b/crates/ethers-contract/src/contract.rs
@@ -1,9 +1,11 @@
 use crate::{ContractCall, Event};
 
-use ethers_abi::{Abi, Detokenize, Error, EventExt, Function, FunctionExt, Tokenize};
 use ethers_providers::{networks::Network, JsonRpcClient};
 use ethers_signers::{Client, Signer};
-use ethers_types::{Address, Filter, NameOrAddress, Selector, TransactionRequest};
+use ethers_types::{
+    abi::{Abi, Detokenize, Error, EventExt, Function, FunctionExt, Tokenize},
+    Address, Filter, NameOrAddress, Selector, TransactionRequest,
+};
 
 use rustc_hex::ToHex;
 use std::{collections::HashMap, fmt::Debug, hash::Hash, marker::PhantomData};
diff --git a/crates/ethers-contract/src/event.rs b/crates/ethers-contract/src/event.rs
index ec18c692..691c5668 100644
--- a/crates/ethers-contract/src/event.rs
+++ b/crates/ethers-contract/src/event.rs
@@ -1,9 +1,11 @@
 use crate::ContractError;
 
-use ethers_abi::{Detokenize, Event as AbiEvent, RawLog};
 use ethers_providers::{networks::Network, JsonRpcClient, Provider};
 
-use ethers_types::{BlockNumber, Filter, ValueOrArray, H256};
+use ethers_types::{
+    abi::{Detokenize, Event as AbiEvent, RawLog},
+    BlockNumber, Filter, ValueOrArray, H256,
+};
 
 use std::marker::PhantomData;
 
diff --git a/crates/ethers-contract/src/lib.rs b/crates/ethers-contract/src/lib.rs
index c76e08a7..99352d49 100644
--- a/crates/ethers-contract/src/lib.rs
+++ b/crates/ethers-contract/src/lib.rs
@@ -14,8 +14,8 @@ pub use ethers_contract_abigen::Builder;
 pub use ethers_contract_derive::abigen;
 
 // re-export for convenience
-pub use ethers_abi as abi;
 pub use ethers_providers as providers;
 pub use ethers_signers as signers;
 pub use ethers_types as types;
+pub use ethers_types::abi;
 pub use once_cell::sync::Lazy;
diff --git a/crates/ethers-providers/Cargo.toml b/crates/ethers-providers/Cargo.toml
index e3ecb248..fd090ccb 100644
--- a/crates/ethers-providers/Cargo.toml
+++ b/crates/ethers-providers/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2018"
 [dependencies]
 ethers-types = { version = "0.1.0", path = "../ethers-types" }
 ethers-utils = { version = "0.1.0", path = "../ethers-utils" }
-ethers-abi = { version = "0.1.0", path = "../ethers-abi" }
 
 async-trait = { version = "0.1.31", default-features = false }
 reqwest = { version = "0.10.4", default-features = false, features = ["json", "rustls-tls"] }
diff --git a/crates/ethers-providers/src/provider.rs b/crates/ethers-providers/src/provider.rs
index 2aa6639e..b12ffaf0 100644
--- a/crates/ethers-providers/src/provider.rs
+++ b/crates/ethers-providers/src/provider.rs
@@ -1,7 +1,7 @@
 use crate::{ens, http::Provider as HttpProvider, networks::Network, JsonRpcClient};
 
-use ethers_abi::{Detokenize, ParamType};
 use ethers_types::{
+    abi::{self, Detokenize, ParamType},
     Address, Block, BlockId, BlockNumber, Bytes, Filter, Log, NameOrAddress, Selector, Transaction,
     TransactionReceipt, TransactionRequest, TxHash, U256,
 };
@@ -256,8 +256,8 @@ impl<P: JsonRpcClient, N: Network> Provider<P, N> {
 ///
 /// If the provided bytes were not an interpretation of an address
 fn decode_bytes<T: Detokenize>(param: ParamType, bytes: Bytes) -> T {
-    let tokens = ethers_abi::decode(&[param], &bytes.0)
-        .expect("could not abi-decode bytes to address tokens");
+    let tokens =
+        abi::decode(&[param], &bytes.0).expect("could not abi-decode bytes to address tokens");
     T::from_tokens(tokens).expect("could not parse tokens as address")
 }
 
diff --git a/crates/ethers-types/Cargo.toml b/crates/ethers-types/Cargo.toml
index 6edfdd4d..59ceb197 100644
--- a/crates/ethers-types/Cargo.toml
+++ b/crates/ethers-types/Cargo.toml
@@ -7,18 +7,27 @@ edition = "2018"
 [dependencies]
 ethers-utils = { version = "0.1.0", path = "../ethers-utils" }
 
+# ethereum related
 ethereum-types = { version = "0.9.2", default-features = false, features = ["serialize"] }
-serde = { version = "1.0.110", default-features = false, features = ["derive"] }
 rlp = { version = "0.4.5", default-features = false }
-rustc-hex = { version = "2.1.0", default-features = false }
-thiserror = { version = "1.0.19", default-features = false }
+ethabi = { version = "12.0.0", default-features = false, optional = true }
 
 # crypto
 secp256k1 = { version = "0.17.2", default-features = false, features = ["std", "recovery", "rand"] }
 rand = { version = "0.5.1", default-features = false } # this should be the same rand crate version as the one in secp
 zeroize = { version = "1.1.0", default-features = false }
 
+# misc
+serde = { version = "1.0.110", default-features = false, features = ["derive"] }
+rustc-hex = { version = "2.1.0", default-features = false }
+thiserror = { version = "1.0.19", default-features = false }
+arrayvec = { version = "0.5.1", default-features = false, optional = true }
+
 [dev-dependencies]
 serde_json = { version = "1.0.53", default-features = false }
 rand = { version = "0.5.1" }
 bincode = "1.2.1"
+
+[features]
+default = ["abi"]
+abi = ["ethabi", "arrayvec"]
diff --git a/crates/ethers-abi/src/lib.rs b/crates/ethers-types/src/abi/mod.rs
similarity index 99%
rename from crates/ethers-abi/src/lib.rs
rename to crates/ethers-types/src/abi/mod.rs
index b372e3f2..eae95c54 100644
--- a/crates/ethers-abi/src/lib.rs
+++ b/crates/ethers-types/src/abi/mod.rs
@@ -1,6 +1,6 @@
 //! This module implements extensions to the `ethabi` API.
 //! Taken from: https://github.com/gnosis/ethcontract-rs/blob/master/common/src/abiext.rs
-use ethers_types::Selector;
+use crate::Selector;
 use ethers_utils::id;
 
 pub use ethabi::Contract as Abi;
diff --git a/crates/ethers-abi/src/tokens.rs b/crates/ethers-types/src/abi/tokens.rs
similarity index 99%
rename from crates/ethers-abi/src/tokens.rs
rename to crates/ethers-types/src/abi/tokens.rs
index 16fb42fa..35861522 100644
--- a/crates/ethers-abi/src/tokens.rs
+++ b/crates/ethers-types/src/abi/tokens.rs
@@ -1,10 +1,9 @@
 //! Contract Functions Output types.
 //! Adapted from: https://github.com/tomusdrw/rust-web3/blob/master/src/contract/tokens.rs
 #![allow(clippy::all)]
-use crate::Token;
+use crate::{abi::Token, Address, Bytes, H256, U128, U256};
 
 use arrayvec::ArrayVec;
-use ethers_types::{Address, Bytes, H256, U128, U256};
 use thiserror::Error;
 
 #[derive(Clone, Debug, Error)]
@@ -470,8 +469,8 @@ impl_fixed_types!(1024);
 #[cfg(test)]
 mod tests {
     use super::{Detokenize, Tokenizable};
+    use crate::{Address, U256};
     use ethabi::Token;
-    use ethers_types::{Address, U256};
 
     fn output<R: Detokenize>() -> R {
         unimplemented!()
diff --git a/crates/ethers-types/src/block.rs b/crates/ethers-types/src/chainstate/block.rs
similarity index 95%
rename from crates/ethers-types/src/block.rs
rename to crates/ethers-types/src/chainstate/block.rs
index 40dd2750..54c9d922 100644
--- a/crates/ethers-types/src/block.rs
+++ b/crates/ethers-types/src/chainstate/block.rs
@@ -1,3 +1,4 @@
+// Taken from https://github.com/tomusdrw/rust-web3/blob/master/src/types/block.rs
 use crate::{Address, Bloom, Bytes, H256, U256, U64};
 use serde::{ser::SerializeStruct, Deserialize, Serialize, Serializer};
 
@@ -63,8 +64,13 @@ pub struct Block<TX> {
 }
 
 #[derive(Copy, Clone, Debug, PartialEq)]
+/// A Block Hash or Block Number
 pub enum BlockId {
+    // TODO: May want to expand this to include the requireCanonical field
+    // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1898.md
+    /// A block hash
     Hash(H256),
+    /// A block number
     Number(BlockNumber),
 }
 
@@ -102,7 +108,7 @@ impl Serialize for BlockId {
     }
 }
 
-/// Block Number
+/// A block Number (or tag - "latest", "earliest", "pending")
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub enum BlockNumber {
     /// Latest block
diff --git a/crates/ethers-types/src/bytes.rs b/crates/ethers-types/src/chainstate/bytes.rs
similarity index 100%
rename from crates/ethers-types/src/bytes.rs
rename to crates/ethers-types/src/chainstate/bytes.rs
diff --git a/crates/ethers-types/src/ens.rs b/crates/ethers-types/src/chainstate/ens.rs
similarity index 100%
rename from crates/ethers-types/src/ens.rs
rename to crates/ethers-types/src/chainstate/ens.rs
diff --git a/crates/ethers-types/src/log.rs b/crates/ethers-types/src/chainstate/log.rs
similarity index 100%
rename from crates/ethers-types/src/log.rs
rename to crates/ethers-types/src/chainstate/log.rs
diff --git a/crates/ethers-types/src/chainstate/mod.rs b/crates/ethers-types/src/chainstate/mod.rs
new file mode 100644
index 00000000..2933bdf4
--- /dev/null
+++ b/crates/ethers-types/src/chainstate/mod.rs
@@ -0,0 +1,27 @@
+pub type Selector = [u8; 4];
+
+// Re-export common ethereum datatypes with more specific names
+pub use ethereum_types::H256 as TxHash;
+pub use ethereum_types::{Address, Bloom, H160, H256, U128, U256, U64};
+
+mod transaction;
+pub use transaction::{Overrides, Transaction, TransactionReceipt, TransactionRequest};
+
+mod bytes;
+pub use bytes::Bytes;
+
+mod block;
+pub use block::{Block, BlockId, BlockNumber};
+
+mod log;
+pub use log::{Filter, Log, ValueOrArray};
+
+mod ens;
+pub use ens::NameOrAddress;
+
+// re-export the non-standard rand version so that other crates don't use the
+// wrong one by accident
+pub use rand;
+
+// re-export libsecp
+pub use secp256k1;
diff --git a/crates/ethers-types/src/transaction.rs b/crates/ethers-types/src/chainstate/transaction.rs
similarity index 100%
rename from crates/ethers-types/src/transaction.rs
rename to crates/ethers-types/src/chainstate/transaction.rs
diff --git a/crates/ethers-types/src/keys.rs b/crates/ethers-types/src/crypto/keys.rs
similarity index 95%
rename from crates/ethers-types/src/keys.rs
rename to crates/ethers-types/src/crypto/keys.rs
index c17f9ce4..8398bc48 100644
--- a/crates/ethers-types/src/keys.rs
+++ b/crates/ethers-types/src/crypto/keys.rs
@@ -74,20 +74,21 @@ impl PrivateKey {
         tx: TransactionRequest,
         chain_id: Option<U64>,
     ) -> Result<Transaction, TxError> {
-        // Calling `
+        // The nonce, gas and gasprice fields must already be populated
         let nonce = tx.nonce.ok_or(TxError::NonceMissing)?;
-        let gas_price = tx.gas_price.ok_or(TxError::NonceMissing)?;
-        let gas = tx.gas.ok_or(TxError::NonceMissing)?;
+        let gas_price = tx.gas_price.ok_or(TxError::GasPriceMissing)?;
+        let gas = tx.gas.ok_or(TxError::GasMissing)?;
 
         // Hash the transaction's RLP encoding
         let hash = tx.hash(chain_id);
         let message = Message::from_slice(hash.as_bytes()).expect("hash is non-zero 32-bytes; qed");
 
+        // Sign it (with replay protection if applicable)
         let signature = self.sign_with_eip155(&message, chain_id);
-
         let rlp = tx.rlp_signed(&signature);
         let hash = keccak256(&rlp.0);
 
+        // This function should not be called with ENS names
         let to = tx.to.map(|to| match to {
             NameOrAddress::Address(inner) => inner,
             NameOrAddress::Name(_) => {
@@ -129,6 +130,7 @@ impl PrivateKey {
     }
 }
 
+/// Applies [EIP155](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-155.md)
 fn to_eip155_v(recovery_id: RecoveryId, chain_id: Option<U64>) -> u64 {
     let standard_v = recovery_id.to_i32() as u64;
     if let Some(chain_id) = chain_id {
@@ -156,7 +158,7 @@ impl Deref for PrivateKey {
 
 impl DefaultIsZeroes for PrivateKey {}
 
-/// A public key
+/// A secp256k1 Public Key
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct PublicKey(pub(super) PubKey);
 
diff --git a/crates/ethers-types/src/crypto/mod.rs b/crates/ethers-types/src/crypto/mod.rs
new file mode 100644
index 00000000..95d5a113
--- /dev/null
+++ b/crates/ethers-types/src/crypto/mod.rs
@@ -0,0 +1,5 @@
+mod keys;
+pub use keys::{PrivateKey, PublicKey, TxError};
+
+mod signature;
+pub use signature::Signature;
diff --git a/crates/ethers-types/src/signature.rs b/crates/ethers-types/src/crypto/signature.rs
similarity index 100%
rename from crates/ethers-types/src/signature.rs
rename to crates/ethers-types/src/crypto/signature.rs
diff --git a/crates/ethers-types/src/lib.rs b/crates/ethers-types/src/lib.rs
index c133bd57..864931c4 100644
--- a/crates/ethers-types/src/lib.rs
+++ b/crates/ethers-types/src/lib.rs
@@ -1,35 +1,10 @@
 //! Various Ethereum Related Datatypes
 
-pub type Selector = [u8; 4];
+mod crypto;
+pub use crypto::*;
 
-// Re-export common ethereum datatypes with more specific names
-pub use ethereum_types::H256 as TxHash;
-pub use ethereum_types::{Address, Bloom, H160, H256, U128, U256, U64};
+mod chainstate;
+pub use chainstate::*;
 
-mod transaction;
-pub use transaction::{Overrides, Transaction, TransactionReceipt, TransactionRequest};
-
-mod keys;
-pub use keys::{PrivateKey, PublicKey, TxError};
-
-mod signature;
-pub use signature::Signature;
-
-mod bytes;
-pub use bytes::Bytes;
-
-mod block;
-pub use block::{Block, BlockId, BlockNumber};
-
-mod log;
-pub use log::{Filter, Log, ValueOrArray};
-
-mod ens;
-pub use ens::NameOrAddress;
-
-// re-export the non-standard rand version so that other crates don't use the
-// wrong one by accident
-pub use rand;
-
-// re-export libsecp
-pub use secp256k1;
+#[cfg(feature = "abi")]
+pub mod abi;
diff --git a/crates/ethers/Cargo.toml b/crates/ethers/Cargo.toml
index 0b711bf4..29e443f5 100644
--- a/crates/ethers/Cargo.toml
+++ b/crates/ethers/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2018"
 [features]
 default = ["full"]
 full = [
-    "abi",
     "contract",
     "providers",
     "signers",
@@ -15,7 +14,6 @@ full = [
     "utils",
 ]
 
-abi = ["ethers-abi"]
 contract = ["ethers-contract"]
 providers = ["ethers-providers"]
 signers = ["ethers-signers"]
@@ -23,7 +21,6 @@ types = ["ethers-types"]
 utils = ["ethers-utils"]
 
 [dependencies]
-ethers-abi = { version = "0.1.0", path = "../ethers-abi", optional = true }
 ethers-contract = { version = "0.1.0", path = "../ethers-contract", features = ["abigen"], optional = true }
 ethers-providers = { version = "0.1.0", path = "../ethers-providers", optional = true }
 ethers-signers = { version = "0.1.0", path = "../ethers-signers", optional = true }
diff --git a/crates/ethers/src/lib.rs b/crates/ethers/src/lib.rs
index 7450f8d3..a4324b58 100644
--- a/crates/ethers/src/lib.rs
+++ b/crates/ethers/src/lib.rs
@@ -15,11 +15,6 @@
 //! More examples can be found in the [`examples` directory of the
 //! repositry](https://github.com/gakonst/ethers-rs)
 
-#[cfg(feature = "abi")]
-pub mod abi {
-    pub use ethers_abi::*;
-}
-
 #[cfg(feature = "contract")]
 pub mod contract {
     pub use ethers_contract::*;