diff --git a/packages/algo-ts/src/box.ts b/packages/algo-ts/src/box.ts
index 2c97bb3e..9ef87f3b 100644
--- a/packages/algo-ts/src/box.ts
+++ b/packages/algo-ts/src/box.ts
@@ -1,3 +1,4 @@
+import { ctxMgr } from './execution-context'
 import { bytes, uint64 } from './primitives'
 
 export type Box<TValue> = {
@@ -24,12 +25,11 @@ export type BoxMap<TKey, TValue> = {
 
 export type BoxRef = {
   readonly key: bytes
-
   readonly exists: boolean
   value: bytes
   get(options: { default: bytes }): bytes
-  put(value: bytes): bytes
-  splice(start: uint64, end: uint64, value: bytes): void
+  put(value: bytes): void
+  splice(start: uint64, length: uint64, value: bytes): void
   replace(start: uint64, value: bytes): void
   extract(start: uint64, length: uint64): bytes
   delete(): boolean
@@ -40,13 +40,13 @@ export type BoxRef = {
 }
 
 export function Box<TValue>(options: { key: bytes | string }): Box<TValue> {
-  throw new Error('Not implemented')
+  return ctxMgr.instance.state.Box(options)
 }
 
 export function BoxMap<TKey, TValue>(options: { keyPrefix: bytes | string }): BoxMap<TKey, TValue> {
-  throw new Error('Not implemented')
+  return ctxMgr.instance.state.BoxMap(options)
 }
 
 export function BoxRef(options: { key: bytes | string }): BoxRef {
-  throw new Error('Not implemented')
+  return ctxMgr.instance.state.BoxRef(options)
 }
diff --git a/packages/algo-ts/src/execution-context.ts b/packages/algo-ts/src/execution-context.ts
index dd02bf02..c862d721 100644
--- a/packages/algo-ts/src/execution-context.ts
+++ b/packages/algo-ts/src/execution-context.ts
@@ -1,4 +1,4 @@
-import { Contract, GlobalState, gtxn, itxn, LocalState } from '.'
+import { Box, BoxMap, BoxRef, Contract, GlobalState, gtxn, itxn, LocalState } from '.'
 import { AbiMethodConfig, BareMethodConfig } from './arc4'
 import { OpsNamespace } from './op-types'
 import { bytes, uint64 } from './primitives'
@@ -32,8 +32,11 @@ export type ExecutionContext = {
     applicationCall: typeof itxn.applicationCall
   }
   state: {
-    createGlobalState: typeof GlobalState
-    createLocalState: typeof LocalState
+    GlobalState: typeof GlobalState
+    LocalState: typeof LocalState
+    Box: typeof Box
+    BoxMap: typeof BoxMap
+    BoxRef: typeof BoxRef
   }
 }
 
diff --git a/packages/algo-ts/src/op.ts b/packages/algo-ts/src/op.ts
index bb1d1c36..4a5ba18d 100644
--- a/packages/algo-ts/src/op.ts
+++ b/packages/algo-ts/src/op.ts
@@ -138,5 +138,6 @@ export const AppParams = createObjectProxy('AppParams')
 export const AssetHolding = createObjectProxy('AssetHolding')
 export const AssetParams = createObjectProxy('AssetParams')
 export const Block = createObjectProxy('Block')
+export const Box = createObjectProxy('Box')
 
 export { VrfVerify } from './op-types'
diff --git a/packages/algo-ts/src/state.ts b/packages/algo-ts/src/state.ts
index 6e27a5cc..cd169813 100644
--- a/packages/algo-ts/src/state.ts
+++ b/packages/algo-ts/src/state.ts
@@ -13,7 +13,7 @@ export type GlobalStateOptions<ValueType> = { key?: bytes | string; initialValue
 
 /** A single key in global state */
 export function GlobalState<ValueType>(options?: GlobalStateOptions<ValueType>): GlobalState<ValueType> {
-  return ctxMgr.instance.state.createGlobalState(options)
+  return ctxMgr.instance.state.GlobalState(options)
 }
 
 /** A value saved in local state */
@@ -29,5 +29,5 @@ export type LocalState<ValueType> = {
 
 /** A single key in local state */
 export function LocalState<ValueType>(options?: { key?: bytes | string }): LocalState<ValueType> {
-  return ctxMgr.instance.state.createLocalState(options)
+  return ctxMgr.instance.state.LocalState(options)
 }