diff --git a/lib/pinchflat/fast_indexing/fast_indexing_helpers.ex b/lib/pinchflat/fast_indexing/fast_indexing_helpers.ex
index 62c2f99..bad6af3 100644
--- a/lib/pinchflat/fast_indexing/fast_indexing_helpers.ex
+++ b/lib/pinchflat/fast_indexing/fast_indexing_helpers.ex
@@ -13,12 +13,13 @@ defmodule Pinchflat.FastIndexing.FastIndexingHelpers do
   alias Pinchflat.Media
   alias Pinchflat.Sources.Source
   alias Pinchflat.FastIndexing.YoutubeRss
+  alias Pinchflat.FastIndexing.YoutubeApi
   alias Pinchflat.Downloading.DownloadingHelpers
 
   alias Pinchflat.YtDlp.Media, as: YtDlpMedia
 
   @doc """
-  Fetches new media IDs from a source's YouTube RSS feed, indexes them, and kicks off downloading
+  Fetches new media IDs for a source from YT's API or RSS, indexes them, and kicks off downloading
   tasks for any pending media items. See comments in `FastIndexingWorker` for more info on the
   order of operations and how this fits into the indexing process.
 
@@ -26,7 +27,7 @@ defmodule Pinchflat.FastIndexing.FastIndexingHelpers do
   downloaded_.
   """
   def kickoff_download_tasks_from_youtube_rss_feed(%Source{} = source) do
-    {:ok, media_ids} = YoutubeRss.get_recent_media_ids(source)
+    {:ok, media_ids} = get_recent_media_ids(source)
     existing_media_items = list_media_items_by_media_id_for(source, media_ids)
     new_media_ids = media_ids -- Enum.map(existing_media_items, & &1.media_id)
 
@@ -47,6 +48,18 @@ defmodule Pinchflat.FastIndexing.FastIndexingHelpers do
     Enum.filter(maybe_new_media_items, & &1)
   end
 
+  # If possible, use the YouTube API to fetch media IDs. If that fails, fall back to the RSS feed.
+  # If the YouTube API isn't set up, just use the RSS feed.
+  defp get_recent_media_ids(source) do
+    # TODO: test
+    with true <- YoutubeApi.enabled?(),
+         {:ok, media_ids} <- YoutubeApi.get_recent_media_ids(source) do
+      {:ok, media_ids}
+    else
+      _ -> YoutubeRss.get_recent_media_ids(source)
+    end
+  end
+
   defp list_media_items_by_media_id_for(source, media_ids) do
     MediaQuery.new()
     |> where(^dynamic([mi], ^MediaQuery.for_source(source) and mi.media_id in ^media_ids))
diff --git a/lib/pinchflat/fast_indexing/youtube_api.ex b/lib/pinchflat/fast_indexing/youtube_api.ex
index 2e2a45a..b41450e 100644
--- a/lib/pinchflat/fast_indexing/youtube_api.ex
+++ b/lib/pinchflat/fast_indexing/youtube_api.ex
@@ -1,15 +1,33 @@
 defmodule Pinchflat.FastIndexing.YoutubeApi do
   @moduledoc """
-  TODO
+  Methods for interacting with the YouTube API for fast indexing
   """
 
   require Logger
 
   alias Pinchflat.Sources.Source
   alias Pinchflat.Utils.FunctionUtils
+  alias Pinchflat.FastIndexing.YoutubeBehaviour
+
+  @behaviour YoutubeBehaviour
+
+  @doc """
+  Determines if the YouTube API is enabled for fast indexing
+
+  Returns boolean()
+  """
+  # TODO: test
+  # TODO: update this to use a user setting
+  @impl YoutubeBehaviour
+  def enabled?(), do: true
 
   # TODO: test
-  # TODO: make this a behaviour
+  @doc """
+  Fetches the recent media IDs from the YouTube API for a given source.
+
+  Returns {:ok, [binary()]} | {:error, binary()}
+  """
+  @impl YoutubeBehaviour
   def get_recent_media_ids(%Source{} = source) do
     api_response =
       source
@@ -39,6 +57,7 @@ defmodule Pinchflat.FastIndexing.YoutubeApi do
         Phoenix.json_library().decode(response)
 
       {:error, reason} ->
+        Logger.error("Failed to fetch YouTube API: #{inspect(reason)}")
         {:error, reason}
     end
   end
@@ -52,6 +71,7 @@ defmodule Pinchflat.FastIndexing.YoutubeApi do
       |> Map.get("videoId", nil)
     end)
     |> Enum.reject(&is_nil/1)
+    |> Enum.uniq()
     |> FunctionUtils.wrap_ok()
   end
 
diff --git a/lib/pinchflat/fast_indexing/youtube_behaviour.ex b/lib/pinchflat/fast_indexing/youtube_behaviour.ex
index ea474de..8a6c390 100644
--- a/lib/pinchflat/fast_indexing/youtube_behaviour.ex
+++ b/lib/pinchflat/fast_indexing/youtube_behaviour.ex
@@ -1,3 +1,11 @@
 defmodule Pinchflat.FastIndexing.YoutubeBehaviour do
-  # TODO
+  @moduledoc """
+  This module defines the behaviour for clients that interface with YouTube
+  for the purpose of fast indexing.
+  """
+
+  alias Pinchflat.Sources.Source
+
+  @callback enabled?() :: boolean()
+  @callback get_recent_media_ids(%Source{}) :: {:ok, [String.t()]} | {:error, String.t()}
 end
diff --git a/lib/pinchflat/fast_indexing/youtube_rss.ex b/lib/pinchflat/fast_indexing/youtube_rss.ex
index 8aa0e8d..4837087 100644
--- a/lib/pinchflat/fast_indexing/youtube_rss.ex
+++ b/lib/pinchflat/fast_indexing/youtube_rss.ex
@@ -1,17 +1,31 @@
 defmodule Pinchflat.FastIndexing.YoutubeRss do
   @moduledoc """
-  Methods for interacting with YouTube RSS feeds
+  Methods for interacting with YouTube RSS feeds for fast indexing
   """
 
   require Logger
 
   alias Pinchflat.Sources.Source
+  alias Pinchflat.FastIndexing.YoutubeBehaviour
+
+  @behaviour YoutubeBehaviour
+
+  @doc """
+  Determines if the YouTube RSS feed is enabled for fast indexing. Used to satisfy
+  the `YoutubeBehaviour` behaviour.
+
+  Returns true
+  """
+  # TODO: test
+  @impl YoutubeBehaviour
+  def enabled?(), do: true
 
   @doc """
   Fetches the recent media IDs from a YouTube RSS feed for a given source.
 
   Returns {:ok, [binary()]} | {:error, binary()}
   """
+  @impl YoutubeBehaviour
   def get_recent_media_ids(%Source{} = source) do
     Logger.debug("Fetching recent media IDs from YouTube RSS feed for source: #{source.collection_id}")