diff --git a/background/src/wallet/wallet.ts b/background/src/wallet/wallet.ts
index fb26a15..fcb0c06 100644
--- a/background/src/wallet/wallet.ts
+++ b/background/src/wallet/wallet.ts
@@ -88,7 +88,6 @@ export default class Wallet {
 			"createSequentialWallet",
 			"createPrivateKeyWallet",
 			"sendNCG",
-			"nextNonce",
 			"getPrivateKey",
 			"sign",
 			"signTx",
diff --git a/popup/src/api/background.ts b/popup/src/api/background.ts
index b88a468..5c3dee8 100644
--- a/popup/src/api/background.ts
+++ b/popup/src/api/background.ts
@@ -126,9 +126,6 @@ export default {
 		) => {
 			return await callWallet("sendNCG", [sender, receiver, amount, nonce]);
 		},
-		nextNonce: async (address: string) => {
-			return await callWallet<number>("nextNonce", [address]);
-		},
 		getPrivateKey: async (address: string, passphrase: string) => {
 			return await callWallet<string>("getPrivateKey", [address, passphrase]);
 		},
diff --git a/popup/src/views/Send.vue b/popup/src/views/Send.vue
index 8052483..0f3bb67 100644
--- a/popup/src/views/Send.vue
+++ b/popup/src/views/Send.vue
@@ -181,7 +181,7 @@ export default defineComponent({
 				throw new Error("'account' state seems not loaded yet.");
 			}
 			if (await (this.$refs["sendForm"] as VForm).validate()) {
-				this.nonce = await bg.wallet.nextNonce(this.account.address);
+				this.nonce = await bg.graphql("getNextTxNonce", this.account.address);
 				this.confirmDialog = true;
 			}
 		},