diff --git a/web/modules/custom/asu_item_extras/src/Plugin/Block/UnpaywallBlock.php b/web/modules/custom/asu_item_extras/src/Plugin/Block/UnpaywallBlock.php
new file mode 100644
index 000000000..648b36f5c
--- /dev/null
+++ b/web/modules/custom/asu_item_extras/src/Plugin/Block/UnpaywallBlock.php
@@ -0,0 +1,183 @@
+<?php
+
+namespace Drupal\asu_item_extras\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Render\Renderer;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Cache\Cache;
+use Drupal\Core\Url;
+use Drupal\Core\Link;
+use GuzzleHttp\Client;
+use GuzzleHttp\Exception\RequestException;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+
+
+
+/**
+ * Provides an Unpaywall Block.
+ *
+ * @Block(
+ *   id = "unpaywall_block",
+ *   admin_label = @Translation("Unpaywall"),
+ *   category = @Translation("Custom"),
+ * )
+ */
+class UnpaywallBlock extends BlockBase implements ContainerFactoryPluginInterface {
+  /**
+   * An http client.
+   *
+   * @var \GuzzleHttp\Client
+   */
+  protected $httpClient;
+  /**
+   * Drupal renderer.
+   *
+   * @var \Drupal\Core\Render\Renderer
+   */
+  protected $renderer;
+  /**
+   * The entityTypeManager definition.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManager
+   */
+  protected $entityTypeManager;
+
+
+
+  /**
+   * Constructs a StringFormatter instance.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the formatter.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Render\Renderer $renderer
+   *   The renderer class.
+   * @param \GuzzleHttp\Client $httpClient
+   *   Guzzle client.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entityTypeManager
+   *   The entityTypeManager definition.
+   */
+  public function __construct(array $configuration,
+    $plugin_id,
+    $plugin_definition,
+    Renderer $renderer,
+    Client $httpClient,
+    EntityTypeManagerInterface $entityTypeManager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->renderer = $renderer;
+    $this->httpClient = $httpClient;
+    $this->entityTypeManager = $entityTypeManager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(
+    ContainerInterface $container,
+    array $configuration,
+    $plugin_id,
+    $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('renderer'),
+      $container->get('http_client'),
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    $return_val = '';
+    $block_config = BlockBase::getConfiguration();
+    if (is_array($block_config) && array_key_exists('node', $block_config)) {
+      $node = $block_config['node'];
+
+      $doi_val = "";
+      $typed_idents = $node->field_typed_identifier;
+      foreach ($typed_idents as $typed_ident) {
+        if (!$doi_val) {
+          $typed_target_id = $typed_ident->get("target_id")->getCastedValue();
+          $paragraph = $this->entityTypeManager->getStorage('paragraph')->load($typed_target_id);
+          $typed_ident_target_id = $paragraph->field_identifier_type->target_id;
+          if ($typed_ident_target_id) {
+            $typed_ident_type = $this->entityTypeManager->getStorage('taxonomy_term')->load($typed_ident_target_id)->get('field_identifier_predicate')->value;
+            if ($typed_ident_type == 'doi') {
+              $doi_val = $paragraph->get('field_identifier_value')->value;
+            }
+          }
+        }
+      }
+      if ($doi_val) {
+        $unpaywall_url = $this->callUnpayApi($doi_val);
+        if ($unpaywall_url) {
+          $return_val = render(Link::fromTextAndUrl($this->t('Open access version <i class="fas fa-external-link-alt"></i>'), Url::fromUri($unpaywall_url))->toRenderable());
+        }
+      }
+
+    }
+    return [
+      '#markup' => $return_val
+    ];
+  }
+
+  /**
+   * Gets OA article link if one exists.
+   * 
+   * @param string $doi
+   *  The doi.
+   * 
+   * @return string
+   *  The url.
+   */
+  function callUnpayApi($doi) {
+    $query = "https://api.unpaywall.org/v2/" . $doi . "?email=digitalrepository@asu.edu";
+
+    $response = $this->httpClient->get($query);
+    $response_body = $response->getBody();
+    $status_code = $response->getStatusCode();
+    if ($status_code == 200) {
+      $resource = json_decode($response_body, TRUE);
+      return $resource['best_oa_location']['url'];
+    }
+    else {
+      return null;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheTags() {
+    $block_config = BlockBase::getConfiguration();
+    if (is_array($block_config) && array_key_exists('node', $block_config)) {
+      $nid = $block_config['node'];
+    }
+    if (isset($nid)) {
+      if (!is_string($nid)) {
+        $nid = $nid->id();
+      }
+      return Cache::mergeTags(parent::getCacheTags(), ['node:' . $nid]);
+    }
+    else {
+      // Return default tags instead.
+      return parent::getCacheTags();
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCacheContexts() {
+    return Cache::mergeContexts(parent::getCacheContexts(), ['route']);
+  }
+
+}
diff --git a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-audio.html.twig b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-audio.html.twig
index f1f226713..f5bfdee4d 100644
--- a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-audio.html.twig
+++ b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-audio.html.twig
@@ -132,6 +132,7 @@
     </div>
     <div id="details" class="content-section details">
       <h2>{{ 'Details'|t }}</h2>
+      {{ drupal_block('unpaywall_block', {'node': node}, wrapper=false) }}</p>
       {% if node.field_peer_reviewed.value == 1 %}
         <div>{{ content.field_peer_reviewed }}</div>
       {% endif %}
diff --git a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-complex-object.html.twig b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-complex-object.html.twig
index d04b9640e..94e5babb8 100644
--- a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-complex-object.html.twig
+++ b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-complex-object.html.twig
@@ -136,6 +136,7 @@
     </div>
     <div id="details" class="content-section details">
       <h2>{{ 'Details'|t }}</h2>
+      {{ drupal_block('unpaywall_block', {'node': node}, wrapper=false) }}</p>
       {% if node.field_peer_reviewed.value == 1 %}
         <div>{{ content.field_peer_reviewed }}</div>
       {% endif %}
diff --git a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-document.html.twig b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-document.html.twig
index d163a7ae9..c4684df91 100644
--- a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-document.html.twig
+++ b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-document.html.twig
@@ -128,6 +128,7 @@
     </div>
     <div id="details" class="content-section details">
       <h2>{{ 'Details'|t }}</h2>
+      {{ drupal_block('unpaywall_block', {'node': node}, wrapper=false) }}</p>
       {% if node.field_peer_reviewed.value == 1 %}
         <div>{{ content.field_peer_reviewed }}</div>
       {% endif %}
diff --git a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-image.html.twig b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-image.html.twig
index 0ff2f5143..27157c4ec 100644
--- a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-image.html.twig
+++ b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-image.html.twig
@@ -128,6 +128,7 @@
     </div>
     <div id="details" class="content-section details">
       <h2>{{ 'Details'|t }}</h2>
+      {{ drupal_block('unpaywall_block', {'node': node}, wrapper=false) }}</p>
       {% if node.field_peer_reviewed.value == 1 %}
         <div>{{ content.field_peer_reviewed }}</div>
       {% endif %}
diff --git a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-video.html.twig b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-video.html.twig
index 6e1b8d892..39ba0fd29 100644
--- a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-video.html.twig
+++ b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--asu-video.html.twig
@@ -134,6 +134,7 @@
     </div>
     <div id="details" class="content-section details">
       <h2>{{ 'Details'|t }}</h2>
+      {{ drupal_block('unpaywall_block', {'node': node}, wrapper=false) }}</p>
       {% if node.field_peer_reviewed.value == 1 %}
         <div>{{ content.field_peer_reviewed }}</div>
       {% endif %}
diff --git a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--full.html.twig b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--full.html.twig
index 75bfa7f7b..2013f293a 100644
--- a/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--full.html.twig
+++ b/web/themes/custom/asulib_barrio/templates/content/node--asu-repository-item--full.html.twig
@@ -122,6 +122,7 @@
     </div>
     <div id="details" class="content-section details">
       <h2>{{ 'Details'|t }}</h2>
+      {{ drupal_block('unpaywall_block', {'node': node}, wrapper=false) }}</p>
       {% if node.field_peer_reviewed.value == 1 %}
         <div>{{ content.field_peer_reviewed }}</div>
       {% endif %}