diff --git a/chain-evm/src/machine.rs b/chain-evm/src/machine.rs
index 17a3acf35..9e251e4ff 100644
--- a/chain-evm/src/machine.rs
+++ b/chain-evm/src/machine.rs
@@ -23,9 +23,18 @@ use crate::state::AccountTrie;
 /// EVM Configuration.
 pub type Config = EvmConfig;
 
+/// Gas quantity integer for EVM operations.
+pub type Gas = U256;
+
+/// Gas price integer for EVM operations.
+pub type GasPrice = U256;
+
 /// Gas limit for EVM operations.
 pub type GasLimit = u64;
 
+/// Integer of the value sent with an EVM transaction.
+pub type Value = U256;
+
 /// Environment values for the machine backend.
 pub type Environment = MemoryVicinity;
 
diff --git a/chain-evm/src/state/account.rs b/chain-evm/src/state/account.rs
index 85fa5e6f9..46a7bcc5f 100644
--- a/chain-evm/src/state/account.rs
+++ b/chain-evm/src/state/account.rs
@@ -5,6 +5,9 @@ use primitive_types::{H160, U256};
 pub type Nonce = U256;
 pub type Balance = U256;
 
+/// Smart-contract bytecode, such as the one compiled from Solidity code, for example.
+pub type ByteCode = Box<[u8]>;
+
 /// A represantation of an EVM account.
 #[derive(Clone, Default, PartialEq, Eq)]
 pub struct Account {
diff --git a/chain-evm/src/state/mod.rs b/chain-evm/src/state/mod.rs
index 27740fdf4..cc84d1d33 100644
--- a/chain-evm/src/state/mod.rs
+++ b/chain-evm/src/state/mod.rs
@@ -8,6 +8,6 @@ mod account;
 mod storage;
 mod trie;
 
-pub use account::{Account, AccountAddress, AccountTrie, Balance, Nonce};
+pub use account::{Account, AccountAddress, AccountTrie, Balance, ByteCode, Nonce};
 pub use storage::{Key, Storage, Value};
 pub use trie::Trie;