diff --git a/Cargo.lock b/Cargo.lock
index 2e5e70fe..6a85f4ac 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -188,7 +188,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
diff --git a/core/src/host.rs b/core/src/host.rs
new file mode 100644
index 00000000..7e817451
--- /dev/null
+++ b/core/src/host.rs
@@ -0,0 +1,13 @@
+use std::error::Error;
+
+use athena_interface::{Address, AthenaMessage, ExecutionResult, StorageStatus};
+
+#[mockall::automock]
+pub trait HostInterface {
+  fn get_storage(&self, addr: &Address, key: &[u8; 32]) -> [u8; 32];
+  fn set_storage(&mut self, addr: &Address, key: &[u8; 32], value: &[u8; 32]) -> StorageStatus;
+  fn get_balance(&self, addr: &Address) -> u64;
+  fn call(&mut self, msg: AthenaMessage) -> ExecutionResult;
+  fn spawn(&mut self, blob: Vec<u8>) -> Address;
+  fn deploy(&mut self, code: Vec<u8>) -> Result<Address, Box<dyn Error>>;
+}
diff --git a/core/src/lib.rs b/core/src/lib.rs
index b908c77f..0bb34c5b 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -14,6 +14,7 @@
 #![warn(unused_extern_crates)]
 
 pub mod disassembler;
+pub mod host;
 pub mod io;
 pub mod runtime;
 pub mod syscall;
diff --git a/core/src/runtime/mod.rs b/core/src/runtime/mod.rs
index 05ddb61f..ab909515 100644
--- a/core/src/runtime/mod.rs
+++ b/core/src/runtime/mod.rs
@@ -29,9 +29,10 @@ use std::sync::Arc;
 
 use thiserror::Error;
 
+use crate::host::HostInterface;
 use crate::utils::AthenaCoreOpts;
 
-use athena_interface::{AthenaContext, HostInterface, StatusCode};
+use athena_interface::{AthenaContext, StatusCode};
 
 /// An implementation of a runtime for the Athena RISC-V VM.
 ///
@@ -833,10 +834,8 @@ impl<'host> Runtime<'host> {
 #[cfg(test)]
 pub mod tests {
 
-  use crate::{runtime::ExecutionError, utils::with_max_gas};
-  use athena_interface::{
-    Address, AthenaContext, ExecutionResult, MockHostInterface, StatusCode, ADDRESS_LENGTH,
-  };
+  use crate::{host::MockHostInterface, runtime::ExecutionError, utils::with_max_gas};
+  use athena_interface::{Address, AthenaContext, ExecutionResult, StatusCode, ADDRESS_LENGTH};
 
   use crate::{
     runtime::Register,
diff --git a/core/src/syscall/host.rs b/core/src/syscall/host.rs
index 99bccd65..2c945736 100644
--- a/core/src/syscall/host.rs
+++ b/core/src/syscall/host.rs
@@ -245,9 +245,10 @@ impl Syscall for SyscallHostDeploy {
 
 #[cfg(test)]
 mod tests {
-  use athena_interface::{Address, AthenaContext, ExecutionResult, MockHostInterface};
+  use athena_interface::{Address, AthenaContext, ExecutionResult};
 
   use crate::{
+    host::MockHostInterface,
     runtime::{self, Program},
     utils::{with_max_gas, AthenaCoreOpts},
   };
diff --git a/examples/Cargo.lock b/examples/Cargo.lock
index 1123ca33..00490612 100644
--- a/examples/Cargo.lock
+++ b/examples/Cargo.lock
@@ -116,7 +116,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -138,6 +137,7 @@ name = "athena-sdk"
 version = "0.6.2"
 dependencies = [
  "anyhow",
+ "athena-builder",
  "athena-core",
  "athena-interface",
  "vergen-git2",
diff --git a/examples/fibonacci/program/Cargo.lock b/examples/fibonacci/program/Cargo.lock
index 7f9e3c80..630dd998 100644
--- a/examples/fibonacci/program/Cargo.lock
+++ b/examples/fibonacci/program/Cargo.lock
@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 4
 
-[[package]]
-name = "anstyle"
-version = "1.0.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8365de52b16c035ff4fcafe0092ba9390540e3e352870ac09933bebcaa2c8c56"
-
 [[package]]
 name = "arrayref"
 version = "0.3.9"
@@ -26,7 +20,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -117,12 +110,6 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c74b8349d32d297c9134b8c88677813a227df8f779daa29bfc29c183fe3dca6"
 
-[[package]]
-name = "downcast"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
@@ -136,12 +123,6 @@ dependencies = [
  "athena-vm",
 ]
 
-[[package]]
-name = "fragile"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
-
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -204,32 +185,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "mockall"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a6bfcc6c8c7eed5ee98b9c3e33adc726054389233e201c95dab2d41a3839d2"
-dependencies = [
- "cfg-if",
- "downcast",
- "fragile",
- "mockall_derive",
- "predicates",
- "predicates-tree",
-]
-
-[[package]]
-name = "mockall_derive"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ca3004c2efe9011bd4e461bd8256445052b9615405b4f7ea43fc8ca5c20898"
-dependencies = [
- "cfg-if",
- "proc-macro2",
- "quote",
- "syn 2.0.85",
-]
-
 [[package]]
 name = "parity-scale-codec"
 version = "3.6.12"
@@ -265,32 +220,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "predicates"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e9086cc7640c29a356d1a29fd134380bee9d8f79a17410aa76e7ad295f42c97"
-dependencies = [
- "anstyle",
- "predicates-core",
-]
-
-[[package]]
-name = "predicates-core"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8177bee8e75d6846599c6b9ff679ed51e882816914eec639944d7c9aa11931"
-
-[[package]]
-name = "predicates-tree"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41b740d195ed3166cd147c8047ec98db0e22ec019eb8eeb76d343b795304fb13"
-dependencies = [
- "predicates-core",
- "termtree",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.2.0"
@@ -408,12 +337,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "termtree"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
diff --git a/examples/hello_world/program/Cargo.lock b/examples/hello_world/program/Cargo.lock
index 038a405e..2fca425f 100644
--- a/examples/hello_world/program/Cargo.lock
+++ b/examples/hello_world/program/Cargo.lock
@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 4
 
-[[package]]
-name = "anstyle"
-version = "1.0.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8365de52b16c035ff4fcafe0092ba9390540e3e352870ac09933bebcaa2c8c56"
-
 [[package]]
 name = "arrayref"
 version = "0.3.9"
@@ -26,7 +20,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -117,24 +110,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c74b8349d32d297c9134b8c88677813a227df8f779daa29bfc29c183fe3dca6"
 
-[[package]]
-name = "downcast"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
-name = "fragile"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
-
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -204,32 +185,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "mockall"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a6bfcc6c8c7eed5ee98b9c3e33adc726054389233e201c95dab2d41a3839d2"
-dependencies = [
- "cfg-if",
- "downcast",
- "fragile",
- "mockall_derive",
- "predicates",
- "predicates-tree",
-]
-
-[[package]]
-name = "mockall_derive"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ca3004c2efe9011bd4e461bd8256445052b9615405b4f7ea43fc8ca5c20898"
-dependencies = [
- "cfg-if",
- "proc-macro2",
- "quote",
- "syn 2.0.85",
-]
-
 [[package]]
 name = "parity-scale-codec"
 version = "3.6.12"
@@ -265,32 +220,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "predicates"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e9086cc7640c29a356d1a29fd134380bee9d8f79a17410aa76e7ad295f42c97"
-dependencies = [
- "anstyle",
- "predicates-core",
-]
-
-[[package]]
-name = "predicates-core"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8177bee8e75d6846599c6b9ff679ed51e882816914eec639944d7c9aa11931"
-
-[[package]]
-name = "predicates-tree"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41b740d195ed3166cd147c8047ec98db0e22ec019eb8eeb76d343b795304fb13"
-dependencies = [
- "predicates-core",
- "termtree",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.2.0"
@@ -408,12 +337,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "termtree"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
diff --git a/examples/io/program/Cargo.lock b/examples/io/program/Cargo.lock
index 5ffb1bf2..d3c07db1 100644
--- a/examples/io/program/Cargo.lock
+++ b/examples/io/program/Cargo.lock
@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 4
 
-[[package]]
-name = "anstyle"
-version = "1.0.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8365de52b16c035ff4fcafe0092ba9390540e3e352870ac09933bebcaa2c8c56"
-
 [[package]]
 name = "arrayref"
 version = "0.3.9"
@@ -26,7 +20,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -117,24 +110,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c74b8349d32d297c9134b8c88677813a227df8f779daa29bfc29c183fe3dca6"
 
-[[package]]
-name = "downcast"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
-name = "fragile"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
-
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -205,32 +186,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "mockall"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a6bfcc6c8c7eed5ee98b9c3e33adc726054389233e201c95dab2d41a3839d2"
-dependencies = [
- "cfg-if",
- "downcast",
- "fragile",
- "mockall_derive",
- "predicates",
- "predicates-tree",
-]
-
-[[package]]
-name = "mockall_derive"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ca3004c2efe9011bd4e461bd8256445052b9615405b4f7ea43fc8ca5c20898"
-dependencies = [
- "cfg-if",
- "proc-macro2",
- "quote",
- "syn 2.0.85",
-]
-
 [[package]]
 name = "parity-scale-codec"
 version = "3.6.12"
@@ -266,32 +221,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "predicates"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e9086cc7640c29a356d1a29fd134380bee9d8f79a17410aa76e7ad295f42c97"
-dependencies = [
- "anstyle",
- "predicates-core",
-]
-
-[[package]]
-name = "predicates-core"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8177bee8e75d6846599c6b9ff679ed51e882816914eec639944d7c9aa11931"
-
-[[package]]
-name = "predicates-tree"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41b740d195ed3166cd147c8047ec98db0e22ec019eb8eeb76d343b795304fb13"
-dependencies = [
- "predicates-core",
- "termtree",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.2.0"
@@ -409,12 +338,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "termtree"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
diff --git a/examples/wallet/program/Cargo.lock b/examples/wallet/program/Cargo.lock
index 4a998b44..440cff9a 100644
--- a/examples/wallet/program/Cargo.lock
+++ b/examples/wallet/program/Cargo.lock
@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 4
 
-[[package]]
-name = "anstyle"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bec1de6f59aedf83baf9ff929c98f2ad654b97c9510f4e70cf6f661d49fd5b1"
-
 [[package]]
 name = "arrayref"
 version = "0.3.8"
@@ -26,7 +20,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -143,24 +136,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c74b8349d32d297c9134b8c88677813a227df8f779daa29bfc29c183fe3dca6"
 
-[[package]]
-name = "downcast"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
-name = "fragile"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
-
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -223,32 +204,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "mockall"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a6bfcc6c8c7eed5ee98b9c3e33adc726054389233e201c95dab2d41a3839d2"
-dependencies = [
- "cfg-if",
- "downcast",
- "fragile",
- "mockall_derive",
- "predicates",
- "predicates-tree",
-]
-
-[[package]]
-name = "mockall_derive"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ca3004c2efe9011bd4e461bd8256445052b9615405b4f7ea43fc8ca5c20898"
-dependencies = [
- "cfg-if",
- "proc-macro2",
- "quote",
- "syn 2.0.82",
-]
-
 [[package]]
 name = "parity-scale-codec"
 version = "3.6.12"
@@ -284,32 +239,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "predicates"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e9086cc7640c29a356d1a29fd134380bee9d8f79a17410aa76e7ad295f42c97"
-dependencies = [
- "anstyle",
- "predicates-core",
-]
-
-[[package]]
-name = "predicates-core"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8177bee8e75d6846599c6b9ff679ed51e882816914eec639944d7c9aa11931"
-
-[[package]]
-name = "predicates-tree"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41b740d195ed3166cd147c8047ec98db0e22ec019eb8eeb76d343b795304fb13"
-dependencies = [
- "predicates-core",
- "termtree",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.1.0"
@@ -427,12 +356,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "termtree"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
diff --git a/examples/wallet/script/src/host.rs b/examples/wallet/script/src/host.rs
index 581f1f24..309b5655 100644
--- a/examples/wallet/script/src/host.rs
+++ b/examples/wallet/script/src/host.rs
@@ -3,10 +3,10 @@
 use std::{collections::BTreeMap, error::Error};
 
 use athena_interface::{
-  payload::ExecutionPayload, Address, AthenaMessage, Balance, Bytes32, ExecutionResult,
-  HostInterface, StatusCode, StorageStatus,
+  payload::ExecutionPayload, Address, AthenaMessage, Balance, Bytes32, ExecutionResult, StatusCode,
+  StorageStatus,
 };
-use athena_runner::{vm::AthenaRevision, AthenaVm};
+use athena_runner::{host::HostInterface, vm::AthenaRevision, AthenaVm};
 
 // Stores some of the context that a running host would store to keep
 // track of what's going on in the VM execution
diff --git a/examples/wallet/script/src/main.rs b/examples/wallet/script/src/main.rs
index c51477d7..e9d48f93 100644
--- a/examples/wallet/script/src/main.rs
+++ b/examples/wallet/script/src/main.rs
@@ -9,8 +9,8 @@ use host::*;
 
 use std::error::Error;
 
-use athena_interface::{Address, AthenaContext, Encode, HostInterface, MethodSelector};
-use athena_sdk::{AthenaStdin, ExecutionClient};
+use athena_interface::{Address, AthenaContext, Encode, MethodSelector};
+use athena_sdk::{host::HostInterface, AthenaStdin, ExecutionClient};
 use athena_vm_sdk::{wallet::SpendArguments, Pubkey};
 
 /// The ELF (executable and linkable format) file for the Athena RISC-V VM.
@@ -103,13 +103,13 @@ fn main() {
 
 #[cfg(test)]
 mod tests {
-  use athena_interface::MockHostInterface;
   use athena_interface::{
     payload::ExecutionPayloadBuilder, payload::Payload, Address, AthenaMessage, Balance, Encode,
     MessageKind, MethodSelector, StatusCode,
   };
   use athena_runner::vm::AthenaRevision;
   use athena_runner::AthenaVm;
+  use athena_sdk::host::MockHostInterface;
   use athena_sdk::{AthenaStdin, ExecutionClient};
   use athena_vm_sdk::Pubkey;
   use ed25519_dalek::ed25519::signature::Signer;
diff --git a/ffi/vmlib/src/lib.rs b/ffi/vmlib/src/lib.rs
index 8db494c6..bb956064 100644
--- a/ffi/vmlib/src/lib.rs
+++ b/ffi/vmlib/src/lib.rs
@@ -8,10 +8,10 @@ use athcon_vm::{
   SetOptionError,
 };
 use athena_interface::{
-  Address, AthenaMessage, Balance, Bytes32, ExecutionResult, HostInterface, MessageKind,
-  StatusCode, StorageStatus, TransactionContext,
+  Address, AthenaMessage, Balance, Bytes32, ExecutionResult, MessageKind, StatusCode,
+  StorageStatus, TransactionContext,
 };
-use athena_runner::{vm::AthenaRevision, AthenaVm};
+use athena_runner::{host::HostInterface, vm::AthenaRevision, AthenaVm};
 
 #[athcon_declare_vm("Athena", "athena1", "0.1.0")]
 pub struct AthenaVMWrapper {
diff --git a/interface/Cargo.toml b/interface/Cargo.toml
index 00742f41..3677914e 100644
--- a/interface/Cargo.toml
+++ b/interface/Cargo.toml
@@ -11,4 +11,3 @@ edition.workspace = true
 blake3 = "1.5.5"
 hex = "0.4.3"
 parity-scale-codec = { version = "3.6.12", features = ["derive"] }
-mockall = "0.13.1"
diff --git a/interface/src/lib.rs b/interface/src/lib.rs
index afc91020..4bd3286b 100644
--- a/interface/src/lib.rs
+++ b/interface/src/lib.rs
@@ -8,7 +8,7 @@ pub use context::*;
 
 pub use parity_scale_codec::{Decode, Encode};
 
-use std::{convert::TryFrom, error::Error, fmt};
+use std::{convert::TryFrom, fmt};
 
 pub const ADDRESS_LENGTH: usize = 24;
 pub const BYTES32_LENGTH: usize = 32;
@@ -287,16 +287,6 @@ impl ExecutionResult {
   }
 }
 
-#[mockall::automock]
-pub trait HostInterface {
-  fn get_storage(&self, addr: &Address, key: &Bytes32) -> Bytes32;
-  fn set_storage(&mut self, addr: &Address, key: &Bytes32, value: &Bytes32) -> StorageStatus;
-  fn get_balance(&self, addr: &Address) -> Balance;
-  fn call(&mut self, msg: AthenaMessage) -> ExecutionResult;
-  fn spawn(&mut self, blob: Vec<u8>) -> Address;
-  fn deploy(&mut self, code: Vec<u8>) -> Result<Address, Box<dyn Error>>;
-}
-
 #[cfg(test)]
 mod tests {
   use super::*;
diff --git a/runner/src/lib.rs b/runner/src/lib.rs
index aaa62422..13f910fe 100644
--- a/runner/src/lib.rs
+++ b/runner/src/lib.rs
@@ -1,3 +1,4 @@
 pub mod vm;
 
+pub use athena_sdk::host;
 pub use vm::AthenaVm;
diff --git a/runner/src/vm.rs b/runner/src/vm.rs
index 28540cad..3ae3495e 100644
--- a/runner/src/vm.rs
+++ b/runner/src/vm.rs
@@ -1,10 +1,10 @@
 use athena_core::runtime::ExecutionError;
 use athena_interface::{
   payload::{ExecutionPayload, Payload},
-  AthenaContext, AthenaMessage, Decode, ExecutionResult, HostInterface, StatusCode,
+  AthenaContext, AthenaMessage, Decode, ExecutionResult, StatusCode,
 };
 
-use athena_sdk::{AthenaStdin, ExecutionClient};
+use athena_sdk::{host::HostInterface, AthenaStdin, ExecutionClient};
 
 // currently unused
 #[derive(Debug, Clone, Copy)]
@@ -135,8 +135,9 @@ mod tests {
   use super::*;
   use athena_interface::{
     payload::{ExecutionPayloadBuilder, Payload},
-    Address, AthenaMessage, Balance, Encode, MessageKind, MethodSelector, MockHostInterface,
+    Address, AthenaMessage, Balance, Encode, MessageKind, MethodSelector,
   };
+  use athena_sdk::host::MockHostInterface;
   const ADDRESS_ALICE: Address = Address([1u8; 24]);
 
   fn setup_logger() {
diff --git a/sdk/src/lib.rs b/sdk/src/lib.rs
index c066f198..9669928a 100644
--- a/sdk/src/lib.rs
+++ b/sdk/src/lib.rs
@@ -2,10 +2,11 @@
 //!
 //! A library for interacting with the Athena RISC-V VM.
 
+pub use athena_core::host;
 pub use athena_core::io::{AthenaPublicValues, AthenaStdin};
 use athena_core::runtime::{ExecutionError, Program, Runtime};
 use athena_core::utils::AthenaCoreOpts;
-use athena_interface::{AthenaContext, HostInterface, MethodSelector};
+use athena_interface::{AthenaContext, MethodSelector};
 
 /// A client for interacting with Athena.
 pub struct ExecutionClient;
@@ -50,7 +51,7 @@ impl ExecutionClient {
     &self,
     elf: &[u8],
     stdin: AthenaStdin,
-    host: Option<&mut dyn HostInterface>,
+    host: Option<&mut dyn host::HostInterface>,
     max_gas: Option<u32>,
     context: Option<AthenaContext>,
   ) -> Result<(AthenaPublicValues, Option<u32>), ExecutionError> {
@@ -77,7 +78,7 @@ impl ExecutionClient {
     elf: &[u8],
     selector: &MethodSelector,
     stdin: AthenaStdin,
-    host: Option<&mut dyn HostInterface>,
+    host: Option<&mut dyn host::HostInterface>,
     max_gas: Option<u32>,
     context: Option<AthenaContext>,
   ) -> Result<(AthenaPublicValues, Option<u32>), ExecutionError> {
@@ -118,7 +119,7 @@ impl ExecutionClient {
     &self,
     elf: &[u8],
     stdin: AthenaStdin,
-    host: Option<&mut dyn HostInterface>,
+    host: Option<&mut dyn host::HostInterface>,
     max_gas: Option<u32>,
     context: Option<AthenaContext>,
     gdb_port: u16,
@@ -162,7 +163,7 @@ impl ExecutionClient {
     elf: &[u8],
     function: &str,
     stdin: AthenaStdin,
-    host: Option<&mut dyn HostInterface>,
+    host: Option<&mut dyn host::HostInterface>,
     max_gas: Option<u32>,
     context: Option<AthenaContext>,
     gdb_port: u16,
diff --git a/tests/entrypoint/Cargo.lock b/tests/entrypoint/Cargo.lock
index fbbf2373..ebfe8ee3 100644
--- a/tests/entrypoint/Cargo.lock
+++ b/tests/entrypoint/Cargo.lock
@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 4
 
-[[package]]
-name = "anstyle"
-version = "1.0.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8365de52b16c035ff4fcafe0092ba9390540e3e352870ac09933bebcaa2c8c56"
-
 [[package]]
 name = "arrayref"
 version = "0.3.9"
@@ -26,7 +20,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -143,12 +136,6 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c74b8349d32d297c9134b8c88677813a227df8f779daa29bfc29c183fe3dca6"
 
-[[package]]
-name = "downcast"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
-
 [[package]]
 name = "entrypoint-test"
 version = "0.1.0"
@@ -164,12 +151,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
-name = "fragile"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
-
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -232,32 +213,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "mockall"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a6bfcc6c8c7eed5ee98b9c3e33adc726054389233e201c95dab2d41a3839d2"
-dependencies = [
- "cfg-if",
- "downcast",
- "fragile",
- "mockall_derive",
- "predicates",
- "predicates-tree",
-]
-
-[[package]]
-name = "mockall_derive"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ca3004c2efe9011bd4e461bd8256445052b9615405b4f7ea43fc8ca5c20898"
-dependencies = [
- "cfg-if",
- "proc-macro2",
- "quote",
- "syn 2.0.85",
-]
-
 [[package]]
 name = "parity-scale-codec"
 version = "3.6.12"
@@ -293,32 +248,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "predicates"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e9086cc7640c29a356d1a29fd134380bee9d8f79a17410aa76e7ad295f42c97"
-dependencies = [
- "anstyle",
- "predicates-core",
-]
-
-[[package]]
-name = "predicates-core"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8177bee8e75d6846599c6b9ff679ed51e882816914eec639944d7c9aa11931"
-
-[[package]]
-name = "predicates-tree"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41b740d195ed3166cd147c8047ec98db0e22ec019eb8eeb76d343b795304fb13"
-dependencies = [
- "predicates-core",
- "termtree",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.2.0"
@@ -436,12 +365,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "termtree"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
diff --git a/tests/host/tests/host.rs b/tests/host/tests/host.rs
index b9c70abd..aa27fc34 100644
--- a/tests/host/tests/host.rs
+++ b/tests/host/tests/host.rs
@@ -1,10 +1,9 @@
 use std::{collections::BTreeMap, error::Error};
 
 use athena_interface::{
-  Address, AthenaContext, AthenaMessage, Balance, Bytes32, ExecutionResult, HostInterface,
-  StorageStatus,
+  Address, AthenaContext, AthenaMessage, Balance, Bytes32, ExecutionResult, StorageStatus,
 };
-use athena_sdk::{AthenaStdin, ExecutionClient};
+use athena_sdk::{host::HostInterface, AthenaStdin, ExecutionClient};
 
 #[derive(Default)]
 struct Host {
diff --git a/tests/panic/Cargo.lock b/tests/panic/Cargo.lock
index 5e032158..8089865d 100644
--- a/tests/panic/Cargo.lock
+++ b/tests/panic/Cargo.lock
@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 4
 
-[[package]]
-name = "anstyle"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1bec1de6f59aedf83baf9ff929c98f2ad654b97c9510f4e70cf6f661d49fd5b1"
-
 [[package]]
 name = "arrayref"
 version = "0.3.8"
@@ -26,7 +20,6 @@ version = "0.6.2"
 dependencies = [
  "blake3",
  "hex",
- "mockall",
  "parity-scale-codec",
 ]
 
@@ -117,24 +110,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c74b8349d32d297c9134b8c88677813a227df8f779daa29bfc29c183fe3dca6"
 
-[[package]]
-name = "downcast"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1435fa1053d8b2fbbe9be7e97eca7f33d37b28409959813daefc1446a14247f1"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
-name = "fragile"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c2141d6d6c8512188a7891b4b01590a45f6dac67afb4f255c4124dbb86d4eaa"
-
 [[package]]
 name = "funty"
 version = "2.0.0"
@@ -197,32 +178,6 @@ version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
-[[package]]
-name = "mockall"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39a6bfcc6c8c7eed5ee98b9c3e33adc726054389233e201c95dab2d41a3839d2"
-dependencies = [
- "cfg-if",
- "downcast",
- "fragile",
- "mockall_derive",
- "predicates",
- "predicates-tree",
-]
-
-[[package]]
-name = "mockall_derive"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25ca3004c2efe9011bd4e461bd8256445052b9615405b4f7ea43fc8ca5c20898"
-dependencies = [
- "cfg-if",
- "proc-macro2",
- "quote",
- "syn 2.0.87",
-]
-
 [[package]]
 name = "panic-test"
 version = "0.1.0"
@@ -265,32 +220,6 @@ dependencies = [
  "zerocopy",
 ]
 
-[[package]]
-name = "predicates"
-version = "3.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e9086cc7640c29a356d1a29fd134380bee9d8f79a17410aa76e7ad295f42c97"
-dependencies = [
- "anstyle",
- "predicates-core",
-]
-
-[[package]]
-name = "predicates-core"
-version = "1.0.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae8177bee8e75d6846599c6b9ff679ed51e882816914eec639944d7c9aa11931"
-
-[[package]]
-name = "predicates-tree"
-version = "1.0.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "41b740d195ed3166cd147c8047ec98db0e22ec019eb8eeb76d343b795304fb13"
-dependencies = [
- "predicates-core",
- "termtree",
-]
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.2.0"
@@ -408,12 +337,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
-[[package]]
-name = "termtree"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3369f5ac52d5eb6ab48c6b4ffdc8efbcad6b89c765749064ba298f2c68a16a76"
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
diff --git a/tests/recursive_call/tests/test.rs b/tests/recursive_call/tests/test.rs
index 426ce04c..1ccf78a9 100644
--- a/tests/recursive_call/tests/test.rs
+++ b/tests/recursive_call/tests/test.rs
@@ -2,10 +2,10 @@ use std::error::Error;
 
 use athena_interface::{
   payload::ExecutionPayload, Address, AthenaContext, AthenaMessage, Balance, Bytes32,
-  ExecutionResult, HostInterface, StorageStatus,
+  ExecutionResult, StorageStatus,
 };
 use athena_runner::{vm::AthenaRevision, AthenaVm};
-use athena_sdk::{AthenaStdin, ExecutionClient};
+use athena_sdk::{host::HostInterface, AthenaStdin, ExecutionClient};
 
 struct Host {
   code: Vec<u8>,