diff --git a/packages/apps/src/components/fee-rate-input.tsx b/packages/apps/src/components/fee-rate-input.tsx
index 06e9dd75a..9c107fb2e 100644
--- a/packages/apps/src/components/fee-rate-input.tsx
+++ b/packages/apps/src/components/fee-rate-input.tsx
@@ -1,5 +1,5 @@
 import Input from "@/ui/input";
-import { parseFeeRate } from "@/utils/misc";
+import { isValidFeeRate, parseFeeRate } from "@/utils/misc";
 
 export default function FeeRateInput({
   placeholder,
@@ -10,7 +10,7 @@ export default function FeeRateInput({
   value?: { formatted: number; value: string };
   onChange?: (value: { formatted: number; value: string }) => void;
 }) {
-  const invalid = (value?.formatted || 0) < 0 || 100000 < (value?.formatted || 0);
+  const invalid = !isValidFeeRate(value?.formatted || 0);
   return (
     <div
       className={`gap-small bg-app-bg p-small lg:p-middle normal-input-wrap flex items-center justify-between ${
diff --git a/packages/apps/src/components/relayer-manage-modal.tsx b/packages/apps/src/components/relayer-manage-modal.tsx
index b0079b66e..6f041f742 100644
--- a/packages/apps/src/components/relayer-manage-modal.tsx
+++ b/packages/apps/src/components/relayer-manage-modal.tsx
@@ -10,7 +10,7 @@ import { useNetwork, useSwitchNetwork } from "wagmi";
 import { formatBalance } from "@/utils/balance";
 import { useRelayer } from "@/hooks/use-relayer";
 import dynamic from "next/dynamic";
-import { formatFeeRate } from "@/utils/misc";
+import { formatFeeRate, isValidFeeRate } from "@/utils/misc";
 
 type TabKey = "update" | "deposit" | "withdraw";
 const Modal = dynamic(() => import("@/ui/modal"), { ssr: false });
@@ -207,7 +207,7 @@ export default function RelayerManageModal({ relayerInfo, isOpen, onClose, onSuc
       busy={busy}
       disabledCancel={busy}
       disabledOk={
-        activeKey === "update" && baseFee.formatted === 0n && feeRate.formatted === 0
+        activeKey === "update" && !(baseFee.value && feeRate.value && isValidFeeRate(feeRate.formatted))
           ? true
           : activeKey === "deposit" && margin.formatted === 0n
           ? true
diff --git a/packages/apps/src/components/relayer-register.tsx b/packages/apps/src/components/relayer-register.tsx
index d75106c4a..edf1cedc4 100644
--- a/packages/apps/src/components/relayer-register.tsx
+++ b/packages/apps/src/components/relayer-register.tsx
@@ -11,7 +11,7 @@ import { Token, TokenSymbol } from "@/types/token";
 import { BridgeCategory } from "@/types/bridge";
 import { useAccount, useNetwork, useSwitchNetwork } from "wagmi";
 import Image from "next/image";
-import { formatFeeRate, getChainLogoSrc, getTokenLogoSrc } from "@/utils/misc";
+import { formatFeeRate, getChainLogoSrc, getTokenLogoSrc, isValidFeeRate } from "@/utils/misc";
 import Tooltip from "@/ui/tooltip";
 import StepCompleteItem from "./step-complete-item";
 import { BalanceInput } from "./balance-input";
@@ -321,7 +321,7 @@ export default function RelayerRegister() {
                 label="Liquidity Fee Rate"
                 tips="The percentage deducted by the relayer from the transfer amount in a transaction"
               >
-                <FeeRateInput placeholder="Enter 0 ~ 100" value={feeRate} onChange={setFeeRate} />
+                <FeeRateInput placeholder="Enter 0 ~ 0.25" value={feeRate} onChange={setFeeRate} />
               </LabelItem>
 
               <Divider />
@@ -372,7 +372,8 @@ export default function RelayerRegister() {
                   }
                 }}
                 disabled={
-                  (sourceChain?.id === chain?.id && (!margin.formatted || !baseFee.formatted || !feeRate.formatted)) ||
+                  (sourceChain?.id === chain?.id &&
+                    !(margin.value && baseFee.value && feeRate.value && isValidFeeRate(feeRate.formatted))) ||
                   (bridgeCategory === "lnbridgev20-default" && !completeMargin)
                 }
                 busy={busy}
diff --git a/packages/apps/src/config/chains/arbitrum.ts b/packages/apps/src/config/chains/arbitrum.ts
index 6ae44bf0a..24691fc58 100644
--- a/packages/apps/src/config/chains/arbitrum.ts
+++ b/packages/apps/src/config/chains/arbitrum.ts
@@ -44,7 +44,7 @@ export const arbitrumChain: ChainConfig = {
       cross: [{ target: { network: "ethereum", symbol: "RING" }, bridge: { category: "lnbridgev20-opposite" } }],
     },
     {
-      decimals: 18,
+      decimals: 6,
       symbol: "USDT",
       name: "USDT",
       type: "erc20",
diff --git a/packages/apps/src/config/chains/mantle.ts b/packages/apps/src/config/chains/mantle.ts
index 38f2af4d8..e34da86d5 100644
--- a/packages/apps/src/config/chains/mantle.ts
+++ b/packages/apps/src/config/chains/mantle.ts
@@ -28,7 +28,7 @@ export const mantleChain: ChainConfig = {
   },
   tokens: [
     {
-      decimals: 18,
+      decimals: 6,
       symbol: "USDT",
       name: "USDT",
       type: "erc20",
diff --git a/packages/apps/src/config/constant.ts b/packages/apps/src/config/constant.ts
index 69b4f9dab..5a3eb1b8b 100644
--- a/packages/apps/src/config/constant.ts
+++ b/packages/apps/src/config/constant.ts
@@ -2,3 +2,6 @@
  * If the fee rate is 10.123%, its value in the contract is 10123 (10.123 * 1000)
  */
 export const FEE_RATE_BASE = 1000;
+
+export const FEE_RATE_MIN = 0;
+export const FEE_RATE_MAX = 0.25 * FEE_RATE_BASE; // 0.25%
diff --git a/packages/apps/src/utils/misc.ts b/packages/apps/src/utils/misc.ts
index 4cbca975c..6505719b6 100644
--- a/packages/apps/src/utils/misc.ts
+++ b/packages/apps/src/utils/misc.ts
@@ -1,4 +1,4 @@
-import { FEE_RATE_BASE } from "@/config/constant";
+import { FEE_RATE_BASE, FEE_RATE_MAX, FEE_RATE_MIN } from "@/config/constant";
 import { RecordStatus } from "@/types/graphql";
 
 export function formatRecordStatus(status: RecordStatus) {
@@ -37,3 +37,7 @@ export function parseFeeRate(rate: string) {
 export function formatFeeRate(rate: number) {
   return Number((rate / FEE_RATE_BASE).toFixed(3));
 }
+
+export function isValidFeeRate(formatted: number) {
+  return FEE_RATE_MIN <= formatted && formatted <= FEE_RATE_MAX;
+}