diff --git a/src/modules/activities/components/ActivityCard.vue b/src/modules/activities/components/ActivityCard.vue
index d021b10..d16c376 100644
--- a/src/modules/activities/components/ActivityCard.vue
+++ b/src/modules/activities/components/ActivityCard.vue
@@ -4,9 +4,10 @@ import { useI18n } from 'vue-i18n'
 import { format } from 'date-fns'
 import { Card, CardContent } from '@/components/ui/card'
 import { Badge } from '@/components/ui/badge'
-import { MapPin, Calendar, Ticket, User } from 'lucide-vue-next'
+import { MapPin, Calendar, Ticket, User, CheckCircle2 } from 'lucide-vue-next'
 import BookmarkButton from './BookmarkButton.vue'
 import { useDateLocale } from '../composables/useDateLocale'
+import { useOwnedTickets } from '../composables/useOwnedTickets'
 import type { Activity } from '../types/activity'
 
 const props = defineProps<{
@@ -19,6 +20,9 @@ const emit = defineEmits<{
 
 const { t } = useI18n()
 const { dateLocale } = useDateLocale()
+const { paidCount } = useOwnedTickets()
+
+const ownedCount = computed(() => paidCount(props.activity.id))
 
 const dateDisplay = computed(() => {
   const a = props.activity
@@ -155,19 +159,38 @@ const placeholderBg = computed(() => {
           <span class="truncate">{{ activity.location }}</span>
         </div>
 
-        <!-- Tickets available -->
+        <!-- Tickets available. `available === undefined` means
+             unlimited capacity (no `tickets_available` tag was
+             published); show the price-only line in that case. -->
         <div
           v-if="activity.ticketInfo"
           class="flex items-center gap-1.5 text-sm text-muted-foreground"
         >
           <Ticket class="w-3.5 h-3.5 shrink-0" />
-          <span v-if="activity.ticketInfo.available > 0">
+          <span v-if="activity.ticketInfo.available === undefined">
+            {{ t('activities.detail.unlimitedTickets', 'Unlimited tickets') }}
+          </span>
+          <span v-else-if="activity.ticketInfo.available > 0">
             {{ t('activities.detail.ticketsAvailable', { count: activity.ticketInfo.available }) }}
           </span>
           <span v-else class="text-destructive font-medium">
             {{ t('activities.detail.soldOut') }}
           </span>
         </div>
+
+        <!-- Owned tickets — shown when the current user holds at
+             least one paid ticket for this activity. Sits next to
+             the availability line so the buyer can see at a glance
+             whether they've already bought in. -->
+        <div
+          v-if="ownedCount > 0"
+          class="flex items-center gap-1.5 text-sm text-primary"
+        >
+          <CheckCircle2 class="w-3.5 h-3.5 shrink-0" />
+          <span>
+            {{ t('activities.detail.ticketsOwned', { count: ownedCount }, ownedCount) }}
+          </span>
+        </div>
       </div>
     </CardContent>
   </Card>
diff --git a/src/modules/activities/composables/useActivities.ts b/src/modules/activities/composables/useActivities.ts
index 78b1bb5..67b49b5 100644
--- a/src/modules/activities/composables/useActivities.ts
+++ b/src/modules/activities/composables/useActivities.ts
@@ -8,6 +8,7 @@ import type { TicketedEvent } from '../types/ticket'
 import { ticketedEventToActivity } from '../types/activity'
 import { useActivitiesStore } from '../stores/activities'
 import { useActivityFilters } from './useActivityFilters'
+import { useOwnedTickets } from './useOwnedTickets'
 
 /**
  * Main composable for activities discovery.
@@ -17,6 +18,7 @@ export function useActivities() {
   const store = useActivitiesStore()
   const filters = useActivityFilters()
   const { isAuthenticated, currentUser } = useAuth()
+  const { ownedActivityIds } = useOwnedTickets()
 
   const isSubscribed = ref(false)
   const subscriptionError = ref<string | null>(null)
@@ -70,7 +72,10 @@ export function useActivities() {
     const all = store.activities.sort(
       (a, b) => a.startDate.getTime() - b.startDate.getTime()
     )
-    return filters.applyFilters(all)
+    const filtered = filters.applyFilters(all)
+    if (!filters.onlyOwnedTickets.value) return filtered
+    const owned = ownedActivityIds.value
+    return filtered.filter(a => owned.has(a.id))
   })
 
   /**
diff --git a/src/modules/activities/composables/useActivityFilters.ts b/src/modules/activities/composables/useActivityFilters.ts
index ab3624b..60bcb5e 100644
--- a/src/modules/activities/composables/useActivityFilters.ts
+++ b/src/modules/activities/composables/useActivityFilters.ts
@@ -15,6 +15,13 @@ export function useActivityFilters() {
   const temporal = ref<TemporalFilter>(DEFAULT_FILTERS.temporal)
   const selectedCategories = ref<ActivityCategory[]>([])
   const selectedDate = ref<Date | undefined>(undefined)
+  /**
+   * When true, the feed is narrowed to activities the current user
+   * holds at least one paid ticket for. Crossed with the
+   * `ownedActivityIds` set from useOwnedTickets in useActivities
+   * (this composable stays free of ticket fetching).
+   */
+  const onlyOwnedTickets = ref(false)
 
   const filters = computed<ActivityFilters>(() => ({
     temporal: temporal.value,
@@ -81,12 +88,18 @@ export function useActivityFilters() {
     temporal.value = DEFAULT_FILTERS.temporal
     selectedCategories.value = []
     selectedDate.value = undefined
+    onlyOwnedTickets.value = false
+  }
+
+  function toggleOwnedTickets() {
+    onlyOwnedTickets.value = !onlyOwnedTickets.value
   }
 
   const hasActiveFilters = computed(() =>
     temporal.value !== 'all' ||
     selectedCategories.value.length > 0 ||
-    selectedDate.value !== undefined
+    selectedDate.value !== undefined ||
+    onlyOwnedTickets.value
   )
 
   return {
@@ -94,6 +107,7 @@ export function useActivityFilters() {
     temporal,
     selectedCategories,
     selectedDate,
+    onlyOwnedTickets,
     filters,
     hasActiveFilters,
 
@@ -103,6 +117,7 @@ export function useActivityFilters() {
     selectDate,
     toggleCategory,
     clearCategories,
+    toggleOwnedTickets,
     resetFilters,
   }
 }
diff --git a/src/modules/activities/composables/useOwnedTickets.ts b/src/modules/activities/composables/useOwnedTickets.ts
new file mode 100644
index 0000000..5ea5d44
--- /dev/null
+++ b/src/modules/activities/composables/useOwnedTickets.ts
@@ -0,0 +1,113 @@
+import { computed, ref, watch } from 'vue'
+import { useAuth } from '@/composables/useAuthService'
+import { injectService, SERVICE_TOKENS } from '@/core/di-container'
+import type { TicketApiService } from '../services/TicketApiService'
+import type { ActivityTicket } from '../types/ticket'
+
+/**
+ * Module-level singleton: owned-ticket lookup keyed by activity id
+ * (== LNbits event id == NIP-52 d-tag, all the same string by
+ * extension contract). Lives at module scope so every <ActivityCard>
+ * + the detail page + the feed filter share ONE underlying fetch
+ * instead of each instance hitting the API.
+ *
+ * Auto-loads on first use after auth is ready, and re-loads when
+ * the current user changes (login/logout). Consumers that mutate the
+ * user's ticket set (e.g. a successful purchase) call `refresh()`
+ * directly so every surface reading this composable updates
+ * atomically.
+ */
+
+const tickets = ref<ActivityTicket[]>([])
+const isLoading = ref(false)
+const error = ref<Error | null>(null)
+let hasAutoLoaded = false
+let lastLoadedUserId: string | null = null
+
+async function fetchTickets(): Promise<void> {
+  const { isAuthenticated, currentUser } = useAuth()
+  if (!isAuthenticated.value || !currentUser.value) {
+    tickets.value = []
+    lastLoadedUserId = null
+    return
+  }
+
+  const ticketApi = injectService(SERVICE_TOKENS.TICKET_API) as TicketApiService
+  const lnbitsAPI = injectService(SERVICE_TOKENS.LNBITS_API) as any
+  const accessToken = lnbitsAPI?.getAccessToken?.() || ''
+
+  isLoading.value = true
+  error.value = null
+  try {
+    tickets.value = await ticketApi.fetchUserTickets(currentUser.value.id, accessToken)
+    lastLoadedUserId = currentUser.value.id
+  } catch (e) {
+    error.value = e instanceof Error ? e : new Error(String(e))
+    tickets.value = []
+  } finally {
+    isLoading.value = false
+  }
+}
+
+const ticketsByActivity = computed<Map<string, ActivityTicket[]>>(() => {
+  const m = new Map<string, ActivityTicket[]>()
+  for (const ticket of tickets.value) {
+    const existing = m.get(ticket.activityId)
+    if (existing) {
+      existing.push(ticket)
+    } else {
+      m.set(ticket.activityId, [ticket])
+    }
+  }
+  return m
+})
+
+const ownedActivityIds = computed<Set<string>>(() => {
+  const s = new Set<string>()
+  for (const ticket of tickets.value) {
+    if (ticket.paid) s.add(ticket.activityId)
+  }
+  return s
+})
+
+function getTickets(activityId: string): ActivityTicket[] {
+  return ticketsByActivity.value.get(activityId) ?? []
+}
+
+function paidCount(activityId: string): number {
+  return getTickets(activityId).filter(t => t.paid).length
+}
+
+export function useOwnedTickets() {
+  const { isAuthenticated, currentUser } = useAuth()
+
+  // First call kicks off the initial load. Subsequent calls just
+  // attach to the shared state.
+  if (!hasAutoLoaded) {
+    hasAutoLoaded = true
+    fetchTickets()
+
+    // Re-fetch when the current user changes (login / logout /
+    // account switch). Compares against the last-fetched user id
+    // so we don't re-fetch when other auth fields update (e.g.
+    // metadata refresh) without the user id changing.
+    watch(
+      () => currentUser.value?.id ?? null,
+      (id) => {
+        if (id !== lastLoadedUserId) fetchTickets()
+      },
+    )
+  }
+
+  return {
+    tickets,
+    ticketsByActivity,
+    ownedActivityIds,
+    getTickets,
+    paidCount,
+    refresh: fetchTickets,
+    isLoading,
+    error,
+    isAuthenticated,
+  }
+}
diff --git a/src/modules/activities/types/activity.ts b/src/modules/activities/types/activity.ts
index a377e8b..993afa7 100644
--- a/src/modules/activities/types/activity.ts
+++ b/src/modules/activities/types/activity.ts
@@ -1,6 +1,6 @@
 import ngeohash from 'ngeohash'
 import type { ActivityCategory } from './category'
-import type { CalendarTimeEvent, CalendarDateEvent } from './nip52'
+import type { CalendarTimeEvent, CalendarDateEvent, TicketTags } from './nip52'
 import type { TicketedEvent } from './ticket'
 
 /**
@@ -74,8 +74,26 @@ export interface OrganizerInfo {
 export interface ActivityTicketInfo {
   price: number
   currency: string
-  available: number
-  total: number
+  /** Remaining capacity. Undefined means unlimited. */
+  available?: number
+  /** Running paid count. */
+  sold: number
+  /** Whether the organizer enabled fiat checkout. */
+  allowFiat: boolean
+  /** Fiat settle currency when allowFiat is true. */
+  fiatCurrency?: string
+}
+
+function ticketTagsToInfo(ticket: TicketTags | undefined): ActivityTicketInfo | undefined {
+  if (!ticket) return undefined
+  return {
+    price: ticket.price,
+    currency: ticket.currency,
+    available: ticket.available,
+    sold: ticket.sold,
+    allowFiat: ticket.allowFiat,
+    fiatCurrency: ticket.fiatCurrency,
+  }
 }
 
 /**
@@ -104,6 +122,7 @@ export function calendarTimeEventToActivity(event: CalendarTimeEvent, organizer?
     geohash: event.geohash,
     category,
     tags: event.hashtags,
+    ticketInfo: ticketTagsToInfo(event.ticket),
     isPrivate: false,
     createdAt: new Date(event.createdAt * 1000),
   }
@@ -140,6 +159,7 @@ export function calendarDateEventToActivity(event: CalendarDateEvent, organizer?
     geohash: event.geohash,
     category,
     tags: event.hashtags,
+    ticketInfo: ticketTagsToInfo(event.ticket),
     isPrivate: false,
     createdAt: new Date(event.createdAt * 1000),
   }
diff --git a/src/modules/activities/types/nip52.ts b/src/modules/activities/types/nip52.ts
index 332d054..b87db35 100644
--- a/src/modules/activities/types/nip52.ts
+++ b/src/modules/activities/types/nip52.ts
@@ -17,6 +17,27 @@ export const NIP52_KINDS = {
 
 export type Nip52Kind = typeof NIP52_KINDS[keyof typeof NIP52_KINDS]
 
+/**
+ * AIO custom tags carried on ticketed calendar events. The aiolabs/events
+ * extension adds these so connected clients can render the buy CTA + the
+ * "X tickets remaining" badge without an extra REST hop. Absent when the
+ * event was published by a non-AIO client.
+ */
+export interface TicketTags {
+  /** Remaining capacity. Undefined means unlimited. */
+  available?: number
+  /** Running paid-count. */
+  sold: number
+  /** Price per ticket in the event's `currency`. */
+  price: number
+  /** Currency string (e.g. 'sat', 'sats', 'USD'). */
+  currency: string
+  /** Whether the organizer enabled fiat checkout. */
+  allowFiat: boolean
+  /** Fiat settle currency when allowFiat is true. */
+  fiatCurrency?: string
+}
+
 /**
  * Parsed NIP-52 date-based calendar event (kind 31922)
  */
@@ -36,6 +57,7 @@ export interface CalendarDateEvent {
   references: string[]
   id: string
   createdAt: number
+  ticket?: TicketTags
 }
 
 /**
@@ -59,6 +81,7 @@ export interface CalendarTimeEvent {
   references: string[]
   id: string
   createdAt: number
+  ticket?: TicketTags
 }
 
 export interface Participant {
@@ -96,6 +119,35 @@ function getTagValues(tags: string[][], tagName: string): string[] {
   return tags.filter(t => t[0] === tagName).map(t => t[1])
 }
 
+/**
+ * Parse the AIO ticket_* tags off a NIP-52 calendar event. Returns
+ * undefined when the event carries no ticket info (e.g. an event
+ * published by a non-AIO client or a non-ticketed AIO event — though
+ * the latter doesn't currently exist since every aiolabs/events row
+ * has a price + currency).
+ *
+ * `tickets_currency` is the discriminator: when absent, the event has
+ * no inventory metadata and the buy UI stays hidden.
+ */
+function parseTicketTags(tags: string[][]): TicketTags | undefined {
+  const currency = getTagValue(tags, 'tickets_currency')
+  if (!currency) return undefined
+
+  const availableStr = getTagValue(tags, 'tickets_available')
+  const soldStr = getTagValue(tags, 'tickets_sold')
+  const priceStr = getTagValue(tags, 'tickets_price')
+  const allowFiatStr = getTagValue(tags, 'tickets_allow_fiat')
+
+  return {
+    available: availableStr != null ? Number(availableStr) : undefined,
+    sold: soldStr != null ? Number(soldStr) : 0,
+    price: priceStr != null ? Number(priceStr) : 0,
+    currency,
+    allowFiat: allowFiatStr === 'true',
+    fiatCurrency: getTagValue(tags, 'tickets_fiat_currency'),
+  }
+}
+
 /**
  * Parse a NIP-52 start/end tag value to a unix timestamp in seconds.
  * Handles: unix seconds, unix milliseconds, and ISO date strings.
@@ -166,6 +218,7 @@ export function parseCalendarTimeEvent(event: NostrEvent): CalendarTimeEvent | n
     references: getTagValues(event.tags, 'r'),
     id: event.id,
     createdAt: event.created_at,
+    ticket: parseTicketTags(event.tags),
   }
 }
 
@@ -213,6 +266,7 @@ export function parseCalendarDateEvent(event: NostrEvent): CalendarDateEvent | n
     references: getTagValues(event.tags, 'r'),
     id: event.id,
     createdAt: event.created_at,
+    ticket: parseTicketTags(event.tags),
   }
 }
 
diff --git a/src/modules/activities/views/ActivitiesPage.vue b/src/modules/activities/views/ActivitiesPage.vue
index 684aa97..d685a11 100644
--- a/src/modules/activities/views/ActivitiesPage.vue
+++ b/src/modules/activities/views/ActivitiesPage.vue
@@ -8,8 +8,9 @@ import {
   CollapsibleContent,
   CollapsibleTrigger,
 } from '@/components/ui/collapsible'
-import { SlidersHorizontal, ChevronDown } from 'lucide-vue-next'
+import { SlidersHorizontal, ChevronDown, Ticket } from 'lucide-vue-next'
 import { useActivities } from '../composables/useActivities'
+import { useAuth } from '@/composables/useAuthService'
 import ActivitySearchOverlay from '../components/ActivitySearchOverlay.vue'
 import TemporalFilterBar from '../components/TemporalFilterBar.vue'
 import CategoryFilterBar from '../components/CategoryFilterBar.vue'
@@ -28,14 +29,18 @@ const {
   selectedCategories,
   hasActiveFilters,
   selectedDate,
+  onlyOwnedTickets,
   selectDate,
   setTemporal,
   toggleCategory,
   clearCategories,
+  toggleOwnedTickets,
   resetFilters,
   subscribe,
 } = useActivities()
 
+const { isAuthenticated } = useAuth()
+
 const filtersOpen = ref(false)
 
 onMounted(() => {
@@ -74,6 +79,21 @@ function handleSelectActivity(activity: Activity) {
       <TemporalFilterBar :model-value="temporal" @update:model-value="setTemporal" />
     </div>
 
+    <!-- "My tickets" filter chip — narrows the feed to activities
+         the user holds at least one paid ticket for. Hidden when
+         logged out (no tickets to filter on). -->
+    <div v-if="isAuthenticated" class="mb-4">
+      <Button
+        :variant="onlyOwnedTickets ? 'default' : 'outline'"
+        size="sm"
+        class="gap-1.5"
+        @click="toggleOwnedTickets"
+      >
+        <Ticket class="w-3.5 h-3.5" />
+        {{ t('activities.filters.myTickets', 'My tickets') }}
+      </Button>
+    </div>
+
     <!-- Category filters (collapsible) -->
     <Collapsible v-model:open="filtersOpen" class="mb-6">
       <CollapsibleTrigger as-child>
diff --git a/src/modules/activities/views/ActivityDetailPage.vue b/src/modules/activities/views/ActivityDetailPage.vue
index 1929ca2..c347363 100644
--- a/src/modules/activities/views/ActivityDetailPage.vue
+++ b/src/modules/activities/views/ActivityDetailPage.vue
@@ -8,15 +8,18 @@ import { Button } from '@/components/ui/button'
 import { Badge } from '@/components/ui/badge'
 import { Separator } from '@/components/ui/separator'
 import {
-  Calendar, MapPin, ArrowLeft, Pencil,
+  Calendar, MapPin, ArrowLeft, Pencil, Ticket, CheckCircle2,
 } from 'lucide-vue-next'
 import { useActivityDetail } from '../composables/useActivityDetail'
 import BookmarkButton from '../components/BookmarkButton.vue'
 import RSVPButton from '../components/RSVPButton.vue'
 import OrganizerCard from '../components/OrganizerCard.vue'
+import PurchaseTicketDialog from '../components/PurchaseTicketDialog.vue'
 import { NIP52_KINDS } from '../types/nip52'
 import { useAuth } from '@/composables/useAuthService'
 import { useActivitiesStore } from '../stores/activities'
+import { useOwnedTickets } from '../composables/useOwnedTickets'
+import { toastService } from '@/core/services/ToastService'
 import { injectService, SERVICE_TOKENS } from '@/core/di-container'
 import type { TicketApiService } from '../services/TicketApiService'
 import type { TicketedEvent } from '../types/ticket'
@@ -94,6 +97,56 @@ const categoryLabel = computed(() => {
 function goBack() {
   router.push({ name: 'activities' })
 }
+
+// --- Ticket purchase + owned-tickets surface ----------------------
+
+const { getTickets, paidCount, refresh: refreshOwnedTickets } = useOwnedTickets()
+
+const ownedTicketsForActivity = computed(() => getTickets(activityId))
+const ownedPaidCount = computed(() => paidCount(activityId))
+
+const purchaseEvent = computed(() => {
+  const a = activity.value
+  if (!a || !a.ticketInfo) return null
+  return {
+    id: a.id,
+    name: a.title,
+    price_per_ticket: a.ticketInfo.price,
+    currency: a.ticketInfo.currency,
+    allow_fiat: a.ticketInfo.allowFiat,
+    fiat_currency: a.ticketInfo.fiatCurrency,
+  }
+})
+
+// available === undefined → unlimited capacity, button always shown
+// available === 0          → sold out, button hidden
+// available > 0            → button shown
+const canBuyTicket = computed(() => {
+  const info = activity.value?.ticketInfo
+  if (!info) return false
+  return info.available === undefined || info.available > 0
+})
+
+const showPurchaseDialog = ref(false)
+
+function openPurchaseDialog() {
+  if (!isAuthenticated.value) {
+    toastService.info('Log in to buy tickets')
+    return
+  }
+  showPurchaseDialog.value = true
+}
+
+// Re-fetch the user's tickets when the purchase dialog closes (the
+// buyer may have just paid). The inventory side updates automatically
+// via the relay republish from the events extension.
+watch(showPurchaseDialog, (open) => {
+  if (!open) refreshOwnedTickets()
+})
+
+function goToMyTickets() {
+  router.push('/my-tickets')
+}
 </script>
 
 <template>
@@ -219,6 +272,67 @@ function goBack() {
         :kind="activity.type === 'date' ? NIP52_KINDS.CALENDAR_DATE_EVENT : NIP52_KINDS.CALENDAR_TIME_EVENT"
       />
 
+      <!-- Tickets — gated on the activity carrying ticketInfo (set
+           by the calendar→Activity converter from the AIO custom
+           tickets_* tags on the published event). Sections render
+           bottom-up: existing owned tickets (when count > 0) above
+           a Purchase CTA (when capacity remains). -->
+      <div v-if="activity.ticketInfo" class="space-y-3">
+        <div
+          v-if="ownedPaidCount > 0"
+          class="bg-primary/10 border border-primary/30 rounded-lg p-4 space-y-3"
+        >
+          <div class="flex items-center gap-2 text-sm font-medium text-foreground">
+            <CheckCircle2 class="w-4 h-4 text-primary" />
+            {{ t('activities.detail.ticketsOwned', { count: ownedPaidCount }, ownedPaidCount) }}
+          </div>
+          <div class="space-y-1">
+            <div
+              v-for="ticket in ownedTicketsForActivity.filter(t => t.paid)"
+              :key="ticket.id"
+              class="text-xs font-mono text-muted-foreground break-all"
+            >
+              {{ ticket.id }}
+            </div>
+          </div>
+          <Button variant="outline" size="sm" class="gap-1.5" @click="goToMyTickets">
+            <Ticket class="w-4 h-4" />
+            {{ t('activities.detail.viewMyTickets', 'View in My Tickets') }}
+          </Button>
+        </div>
+
+        <div v-if="canBuyTicket">
+          <Button
+            class="w-full gap-1.5"
+            size="lg"
+            @click="openPurchaseDialog"
+          >
+            <Ticket class="w-4 h-4" />
+            {{ ownedPaidCount > 0
+                ? t('activities.detail.buyAnotherTicket', 'Buy another ticket')
+                : t('activities.detail.buyTicket', 'Buy ticket') }}
+            <span class="ml-2 opacity-80 font-normal">
+              {{ activity.ticketInfo.price === 0
+                  ? t('activities.detail.free')
+                  : `${activity.ticketInfo.price} ${activity.ticketInfo.currency}` }}
+            </span>
+          </Button>
+        </div>
+        <p
+          v-else-if="ownedPaidCount === 0"
+          class="text-sm text-destructive text-center"
+        >
+          {{ t('activities.detail.soldOut') }}
+        </p>
+      </div>
+
+      <PurchaseTicketDialog
+        v-if="purchaseEvent"
+        :is-open="showPurchaseDialog"
+        :event="purchaseEvent"
+        @update:is-open="showPurchaseDialog = $event"
+      />
+
       <!-- Organizer -->
       <div class="bg-muted/50 rounded-lg p-4">
         <p class="text-xs font-medium text-muted-foreground uppercase tracking-wide mb-2">