diff --git a/frontend/src/stores/posts.js b/frontend/src/stores/posts.js
new file mode 100644
index 0000000..d5b18c7
--- /dev/null
+++ b/frontend/src/stores/posts.js
@@ -0,0 +1,64 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { useApi } from '../composables/useApi.js'
+
+export const usePostsStore = defineStore('posts', () => {
+  const api = useApi()
+
+  const items = ref([])
+  const cursor = ref(null)
+  const loading = ref(false)
+  const done = ref(false)
+  const error = ref(null)
+  const filters = ref({ artist_id: null, platform: null })
+
+  function _qs() {
+    const q = {}
+    if (cursor.value) q.cursor = cursor.value
+    if (filters.value.artist_id != null) q.artist_id = filters.value.artist_id
+    if (filters.value.platform) q.platform = filters.value.platform
+    return q
+  }
+
+  function _reset() {
+    items.value = []
+    cursor.value = null
+    done.value = false
+    error.value = null
+  }
+
+  async function loadInitial(newFilters) {
+    filters.value = {
+      artist_id: newFilters?.artist_id ?? null,
+      platform: newFilters?.platform ?? null,
+    }
+    _reset()
+    await loadMore()
+  }
+
+  async function loadMore() {
+    if (loading.value || done.value) return
+    loading.value = true
+    error.value = null
+    try {
+      const body = await api.get('/api/posts', { params: _qs() })
+      items.value.push(...body.items)
+      cursor.value = body.next_cursor
+      if (body.next_cursor == null) done.value = true
+    } catch (e) {
+      error.value = e
+    } finally {
+      loading.value = false
+    }
+  }
+
+  async function getPostFull(id) {
+    // Used by PostCard's "Show more" expand to fetch the full description.
+    return await api.get(`/api/posts/${id}`)
+  }
+
+  return {
+    items, cursor, loading, done, error, filters,
+    loadInitial, loadMore, getPostFull,
+  }
+})