diff --git a/.changeset/onekey-cardano-support.md b/.changeset/onekey-cardano-support.md
new file mode 100644
index 00000000..16aa835c
--- /dev/null
+++ b/.changeset/onekey-cardano-support.md
@@ -0,0 +1,5 @@
+---
+"@swapkit/wallet-extensions": minor
+---
+
+OneKey now connects Cardano on mainnet.
diff --git a/packages/wallet-extensions/src/onekey/helpers.ts b/packages/wallet-extensions/src/onekey/helpers.ts
index 47a3b307..ddd0198c 100644
--- a/packages/wallet-extensions/src/onekey/helpers.ts
+++ b/packages/wallet-extensions/src/onekey/helpers.ts
@@ -122,6 +122,30 @@ async function getTronWalletMethods() {
   return { ...getTronToolbox({ signer }), address };
 }
 
+async function getCardanoWalletMethods() {
+  const api = await getProvider("cardano", Chain.Cardano).enable();
+  if ((await api.getNetworkId()) !== 1) throw mainnetOnlyError(Chain.Cardano);
+
+  const { addCardanoVkeyWitnesses, decodeCardanoWitnessSet, getCardanoAddressFromBytes, getCardanoToolbox } =
+    await import("@swapkit/toolboxes/cardano");
+
+  const changeAddress = await api.getChangeAddress();
+  const address = changeAddress.startsWith("addr")
+    ? changeAddress
+    : await getCardanoAddressFromBytes(hex.decode(changeAddress));
+
+  const signer = {
+    address,
+    connect: () => Promise.resolve({ address }),
+    disconnect: () => Promise.resolve(),
+    getAddress: () => Promise.resolve(address),
+    signTransaction: async (transaction: string) =>
+      addCardanoVkeyWitnesses(transaction, await decodeCardanoWitnessSet(await api.signTx(transaction))),
+  };
+
+  return { ...getCardanoToolbox({ signer }), address };
+}
+
 async function getStellarWalletMethods() {
   const provider = getProvider("stellar", Chain.Stellar);
   const { address } = await provider.getAddress();
@@ -211,6 +235,8 @@ export function getWalletMethods(chain: Chain): Promise<WalletMethodsWithAddress
   switch (chain) {
     case Chain.Bitcoin:
       return getBitcoinWalletMethods();
+    case Chain.Cardano:
+      return getCardanoWalletMethods();
     case Chain.Near:
       return getNearWalletMethods();
     case Chain.Solana:
diff --git a/packages/wallet-extensions/src/onekey/index.ts b/packages/wallet-extensions/src/onekey/index.ts
index 47bc49b9..332ce4e8 100644
--- a/packages/wallet-extensions/src/onekey/index.ts
+++ b/packages/wallet-extensions/src/onekey/index.ts
@@ -41,6 +41,7 @@ export const onekeyWallet: ExtensionWallet<"connectOnekeyWallet"> = createWallet
     [Chain.Base]: { direct: true, typedData: true },
     [Chain.BinanceSmartChain]: { direct: true, typedData: true },
     [Chain.Bitcoin]: { direct: true },
+    [Chain.Cardano]: { direct: true },
     [Chain.Ethereum]: { direct: true, typedData: true },
     [Chain.Gnosis]: { direct: true, typedData: true },
     [Chain.Near]: { direct: true },
@@ -59,6 +60,7 @@ export const onekeyWallet: ExtensionWallet<"connectOnekeyWallet"> = createWallet
     Chain.Base,
     Chain.BinanceSmartChain,
     Chain.Bitcoin,
+    Chain.Cardano,
     Chain.Ethereum,
     Chain.Gnosis,
     Chain.Near,
diff --git a/packages/wallet-extensions/src/onekey/types.ts b/packages/wallet-extensions/src/onekey/types.ts
index c89936b4..a6a941fc 100644
--- a/packages/wallet-extensions/src/onekey/types.ts
+++ b/packages/wallet-extensions/src/onekey/types.ts
@@ -24,6 +24,12 @@ export type OneKeyTronProvider = {
   };
 };
 
+export type OneKeyCardanoApi = {
+  getChangeAddress: () => Promise<string>;
+  getNetworkId: () => Promise<number>;
+  signTx: (transaction: string, partialSign?: boolean) => Promise<string>;
+};
+
 export type OneKeyStellarProvider = {
   getAddress: () => Promise<{ address: string }>;
   getNetwork: () => Promise<{ network: string; networkPassphrase: string }>;
@@ -35,6 +41,7 @@ export type OneKeyStellarProvider = {
 
 export type OneKeyProviders = {
   btc?: OneKeyBtcProvider;
+  cardano?: { enable: () => Promise<OneKeyCardanoApi> };
   ethereum?: Eip1193Provider;
   jsBridge?: OneKeyJsBridge;
   solana?: SolanaProvider;