diff --git a/backend/cmd/server/VERSION b/backend/cmd/server/VERSION
index d2ddc9d46a..d8250c3818 100644
--- a/backend/cmd/server/VERSION
+++ b/backend/cmd/server/VERSION
@@ -1 +1 @@
-0.1.108.44
+0.1.108.45
diff --git a/frontend/src/components/payment/AmountInput.vue b/frontend/src/components/payment/AmountInput.vue
index 0b0f0e8886..dbbc6935eb 100644
--- a/frontend/src/components/payment/AmountInput.vue
+++ b/frontend/src/components/payment/AmountInput.vue
@@ -36,7 +36,7 @@
           type="text"
           inputmode="decimal"
           :value="customText"
-          :placeholder="`${min} - ${max}`"
+          :placeholder="placeholderText"
           class="input w-full py-3 pl-8 pr-4"
           @input="handleInput"
         />
@@ -56,8 +56,8 @@ const props = withDefaults(defineProps<{
   max?: number
 }>(), {
   amounts: () => [10, 50, 100, 200, 500, 1000],
-  min: 1,
-  max: 10000,
+  min: 0,
+  max: 0,
 })
 
 const emit = defineEmits<{
@@ -68,10 +68,18 @@ const { t } = useI18n()
 
 const customText = ref('')
 
+// 0 = no limit
 const filteredAmounts = computed(() =>
-  props.amounts.filter((a) => a >= props.min && a <= props.max)
+  props.amounts.filter((a) => (props.min <= 0 || a >= props.min) && (props.max <= 0 || a <= props.max))
 )
 
+const placeholderText = computed(() => {
+  if (props.min > 0 && props.max > 0) return `${props.min} - ${props.max}`
+  if (props.min > 0) return `≥ ${props.min}`
+  if (props.max > 0) return `≤ ${props.max}`
+  return t('payment.enterAmount', '输入金额')
+})
+
 const AMOUNT_PATTERN = /^\d*(\.\d{0,2})?$/
 
 function selectAmount(amt: number) {
diff --git a/frontend/src/i18n/locales/en.ts b/frontend/src/i18n/locales/en.ts
index 3d04c8f695..ae02561941 100644
--- a/frontend/src/i18n/locales/en.ts
+++ b/frontend/src/i18n/locales/en.ts
@@ -5050,6 +5050,7 @@ export default {
     amountLabel: 'Amount',
     quickAmounts: 'Quick Amounts',
     customAmount: 'Custom Amount',
+    enterAmount: 'Enter amount',
     paymentMethod: 'Payment Method',
     fee: 'Fee',
     actualPay: 'Actual Payment',
diff --git a/frontend/src/i18n/locales/zh.ts b/frontend/src/i18n/locales/zh.ts
index 2a84cec10b..d186a5228b 100644
--- a/frontend/src/i18n/locales/zh.ts
+++ b/frontend/src/i18n/locales/zh.ts
@@ -5247,6 +5247,7 @@ export default {
     amountLabel: '充值金额',
     quickAmounts: '快捷金额',
     customAmount: '自定义金额',
+    enterAmount: '输入金额',
     paymentMethod: '支付方式',
     fee: '手续费',
     actualPay: '实付金额',
diff --git a/frontend/src/views/user/PaymentView.vue b/frontend/src/views/user/PaymentView.vue
index 35d502b8a5..8b04a2d0eb 100644
--- a/frontend/src/views/user/PaymentView.vue
+++ b/frontend/src/views/user/PaymentView.vue
@@ -151,15 +151,16 @@ const tabs = computed(() => {
 })
 
 const enabledMethods = computed(() => config.value?.enabled_payment_types ?? [])
+// 0 = no limit; provider-level overrides global
 const minAmount = computed(() => {
   const limit = methodLimits.value[selectedMethod.value]
   if (limit?.single_min && limit.single_min > 0) return limit.single_min
-  return config.value?.min_amount && config.value.min_amount > 0 ? config.value.min_amount : 1
+  return config.value?.min_amount && config.value.min_amount > 0 ? config.value.min_amount : 0
 })
 const maxAmount = computed(() => {
   const limit = methodLimits.value[selectedMethod.value]
   if (limit?.single_max && limit.single_max > 0) return limit.single_max
-  return config.value?.max_amount && config.value.max_amount > 0 ? config.value.max_amount : 99999999
+  return config.value?.max_amount && config.value.max_amount > 0 ? config.value.max_amount : 0
 })
 
 const methodOptions = computed<PaymentMethodOption[]>(() =>
@@ -184,14 +185,17 @@ const totalAmount = computed(() =>
 
 const amountError = computed(() => {
   if (validAmount.value <= 0) return ''
-  if (validAmount.value < minAmount.value) return t('payment.amountTooLow', { min: minAmount.value })
-  if (validAmount.value > maxAmount.value) return t('payment.amountTooHigh', { max: maxAmount.value })
+  if (minAmount.value > 0 && validAmount.value < minAmount.value) return t('payment.amountTooLow', { min: minAmount.value })
+  if (maxAmount.value > 0 && validAmount.value > maxAmount.value) return t('payment.amountTooHigh', { max: maxAmount.value })
   return ''
 })
 
 const canSubmit = computed(() => {
   const limitInfo = methodLimits.value[selectedMethod.value]
-  return validAmount.value >= minAmount.value && validAmount.value <= maxAmount.value && limitInfo?.available !== false
+  if (validAmount.value <= 0) return false
+  if (minAmount.value > 0 && validAmount.value < minAmount.value) return false
+  if (maxAmount.value > 0 && validAmount.value > maxAmount.value) return false
+  return limitInfo?.available !== false
 })
 
 function openSubscribeDialog(plan: SubscriptionPlan) {