diff --git a/src/sell-contract/src/app.rs b/src/sell-contract/src/app.rs
index 3557165..bde16e3 100644
--- a/src/sell-contract/src/app.rs
+++ b/src/sell-contract/src/app.rs
@@ -8,6 +8,12 @@ mod storage;
 
 use candid::Principal;
 use configuration::Configuration;
+use dip721::{
+    Dip721, GenericValue, Metadata, NftError, Stats, SupportedInterface, TokenIdentifier,
+    TokenMetadata, TxEvent,
+};
+
+use self::storage::TxHistory;
 
 #[derive(Default)]
 /// Sell contract canister API
@@ -19,3 +25,137 @@ impl SellContract {
         Configuration::is_custodian(caller)
     }
 }
+
+impl Dip721 for SellContract {
+    fn metadata() -> Metadata {
+        todo!()
+    }
+
+    fn stats() -> Stats {
+        todo!()
+    }
+
+    fn logo() -> Option<String> {
+        todo!()
+    }
+
+    fn set_logo(logo: String) {
+        todo!()
+    }
+
+    fn name() -> Option<String> {
+        todo!()
+    }
+
+    fn set_name(name: String) {
+        todo!()
+    }
+
+    fn symbol() -> Option<String> {
+        todo!()
+    }
+
+    fn custodians() -> Vec<Principal> {
+        todo!()
+    }
+
+    fn set_custodians(custodians: Vec<Principal>) {
+        todo!()
+    }
+
+    fn cycles() -> candid::Nat {
+        todo!()
+    }
+
+    fn total_unique_holders() -> candid::Nat {
+        todo!()
+    }
+
+    fn token_metadata(token_identifier: TokenIdentifier) -> Result<TokenMetadata, NftError> {
+        todo!()
+    }
+
+    fn balance_of(owner: Principal) -> Result<candid::Nat, NftError> {
+        todo!()
+    }
+
+    fn owner_of(token_identifier: TokenIdentifier) -> Result<Principal, NftError> {
+        todo!()
+    }
+
+    fn owner_token_identifiers(owner: Principal) -> Result<Vec<TokenIdentifier>, NftError> {
+        todo!()
+    }
+
+    fn owner_token_metadata(owner: Principal) -> Result<Vec<TokenMetadata>, NftError> {
+        todo!()
+    }
+
+    fn operator_of(token_identifier: TokenIdentifier) -> Result<Principal, NftError> {
+        todo!()
+    }
+
+    fn operator_token_identifiers(operator: Principal) -> Result<Vec<TokenIdentifier>, NftError> {
+        todo!()
+    }
+
+    fn operator_token_metadata(operator: Principal) -> Result<Vec<TokenMetadata>, NftError> {
+        todo!()
+    }
+
+    fn supported_interfaces() -> Vec<SupportedInterface> {
+        vec![
+            SupportedInterface::Approval,
+            SupportedInterface::Burn,
+            SupportedInterface::Mint,
+            SupportedInterface::TransactionHistory,
+        ]
+    }
+
+    fn total_supply() -> candid::Nat {
+        todo!()
+    }
+
+    fn approve(
+        operator: Principal,
+        token_identifier: TokenIdentifier,
+    ) -> Result<candid::Nat, NftError> {
+        todo!()
+    }
+
+    fn set_approval_for_all(operator: Principal, approved: bool) -> Result<candid::Nat, NftError> {
+        todo!()
+    }
+
+    fn is_approved_for_all(owner: Principal, operator: Principal) -> Result<bool, NftError> {
+        todo!()
+    }
+
+    fn transfer_from(
+        owner: Principal,
+        to: Principal,
+        token_identifier: TokenIdentifier,
+    ) -> Result<candid::Nat, NftError> {
+        todo!()
+    }
+
+    fn mint(
+        to: Principal,
+        token_identifier: TokenIdentifier,
+        properties: Vec<(String, GenericValue)>,
+    ) -> Result<candid::Nat, NftError> {
+        todo!()
+    }
+
+    fn burn(token_identifier: TokenIdentifier) -> Result<candid::Nat, NftError> {
+        todo!()
+    }
+
+    fn transaction(tx_id: candid::Nat) -> Result<Vec<TxEvent>, NftError> {
+        todo!()
+    }
+
+    fn total_transactions() -> candid::Nat {
+        TxHistory::count().into()
+    }
+}