diff --git a/docs/assets/landing.css b/docs/assets/landing.css
index cce6ca7..ae656f7 100644
--- a/docs/assets/landing.css
+++ b/docs/assets/landing.css
@@ -102,7 +102,9 @@ a.substack {
 }
 
 a.kindle,
-a.apple {
+a.apple,
+a.leanpub,
+a.gumroad {
     width: auto;
     vertical-align: unset;
 }
diff --git a/docs/index.html b/docs/index.html
index 87d95a5..909373f 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -41,7 +41,7 @@
     </header>
     <br />Subscribe for updates on <a class="github" href="https://github.com/twirl/The-API-Book"></a>
     <br/>Follow me on <a class="linkedin" href="https://www.linkedin.com/in/twirl/"></a> · <a class="twitter" href="https://x.com/blogovodoved"></a> · <a class="substack" href="https://twirl.substack.com/">Substack</a>
-    <br />Support this work: buy it on <a class="kindle" href="https://www.amazon.com/gp/product/B09RHH44S5/">Amazon Kindle</a> · <a class="apple" href="http://books.apple.com/us/book/id6467567700">Apple Books</a>
+    <br />Support this work: buy it on <a class="kindle" href="https://www.amazon.com/gp/product/B09RHH44S5/">Amazon Kindle</a> · <a class="apple" href="http://books.apple.com/us/book/id6467567700">Apple Books</a> · <a class="leanpub" href="https://leanpub.com/sergey-konstantinov-the-api/">Leanpub</a> · <a class="gumroad" href="https://twirl.gumroad.com/l/Sergey-Konstantinov-The-API">Gumroad</a>
     <br />Share: <a class="share share-facebook" href="https://www.facebook.com/sharer.php?u=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2F" target="_blank"></a> · <a class="share share-twitter" href="https://x.com/intent/tweet?url=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2F" target="_blank"></a> · <a class="share share-linkedin" href="https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2F" target="_blank"></a> · <a class="share share-reddit" href="https://www.reddit.com/submit?url=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2F&title=The%20API%20by%20Sergey%20Konstantinov%20%E2%80%94%20a%20book%20about%20designing%20APIs%2C%20extending%20them%20and%20finding%20a%20proper%20place%20in%20the%20market" target="_blank"></a><br/>⚙️⚙️⚙️
 </nav>
 <p>API-first development is one of the hottest technical topics nowadays since many companies have started to realize that APIs serves as a multiplier to their opportunities — but it amplifies the design mistakes as well.</p>
diff --git a/docs/index.ru.html b/docs/index.ru.html
index d695bea..0c7376f 100644
--- a/docs/index.ru.html
+++ b/docs/index.ru.html
@@ -41,7 +41,7 @@
     </header>
     <br />Подпишитесь на обновления на <a class="habr" href="https://habr.com/ru/users/forgotten/">Хабре</a>
     <br/>Follow me on <a class="linkedin" href="https://www.linkedin.com/in/twirl/"></a> · <a class="twitter" href="https://x.com/blogovodoved"></a> · <a class="substack" href="https://twirl.substack.com/">Substack</a>
-    <br />Поддержите эту работу: купите книгу на <a class="kindle" href="https://www.amazon.com/gp/product/B09RHH44S5/">Amazon Kindle</a> · <a class="apple" href="http://books.apple.com/us/book/id6467567700">Apple Books</a>
+    <br />Поддержите эту работу: купите книгу на <a class="kindle" href="https://www.amazon.com/gp/product/B09RHH44S5/">Amazon Kindle</a> · <a class="apple" href="http://books.apple.com/us/book/id6467567700">Apple Books</a> · <a class="leanpub" href="https://leanpub.com/sergey-konstantinov-the-api/">Leanpub</a> · <a class="gumroad" href="https://twirl.gumroad.com/l/Sergey-Konstantinov-The-API">Gumroad</a>
     <br />Поделиться: <a class="share share-facebook" href="https://www.facebook.com/sharer.php?u=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2Findex.ru.html" target="_blank"></a> · <a class="share share-twitter" href="https://x.com/intent/tweet?url=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2Findex.ru.html" target="_blank"></a> · <a class="share share-linkedin" href="https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2Findex.ru.html" target="_blank"></a> · <a class="share share-reddit" href="https://www.reddit.com/submit?url=https%3A%2F%2Ftwirl.github.io%2FThe-API-Book%2Findex.ru.html&title=%C2%ABAPI%C2%BB%20%D0%A1%D0%B5%D1%80%D0%B3%D0%B5%D1%8F%20%D0%9A%D0%BE%D0%BD%D1%81%D1%82%D0%B0%D0%BD%D1%82%D0%B8%D0%BD%D0%BE%D0%B2%D0%B0%20%E2%80%94%20%D0%BA%D0%BD%D0%B8%D0%B3%D0%B0%20%D0%BE%20%D0%B4%D0%B8%D0%B7%D0%B0%D0%B9%D0%BD%D0%B5%20API%20%D0%B8%20%D0%B5%D0%B3%D0%BE%20%D0%BF%D1%80%D0%BE%D0%B4%D1%83%D0%BA%D1%82%D0%BE%D0%B2%D0%BE%D0%BC%20%D0%B8%20%D1%82%D0%B5%D1%85%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%BE%D0%BC%20%D1%80%D0%B0%D0%B7%D0%B2%D0%B8%D1%82%D0%B8%D0%B8" target="_blank"></a><br/>⚙️⚙️⚙️
 </nav>
 <p>«API-first» подход — одна из самых горячих горячих тем в разработке программного обеспечения в наше время. Многие компании начали понимать, что API выступает мультипликатором их возможностей — но также умножает и допущенные ошибки.</p>
diff --git a/src/en/l10n.json b/src/en/l10n.json
index 3d2ea3e..699350f 100644
--- a/src/en/l10n.json
+++ b/src/en/l10n.json
@@ -67,6 +67,10 @@
         "kindleHref": "https://www.amazon.com/gp/product/B09RHH44S5/",
         "appleTag": "Apple Books",
         "appleHref": "http://books.apple.com/us/book/id6467567700",
+        "leanpubTag": "Leanpub",
+        "leanpubHref": "https://leanpub.com/sergey-konstantinov-the-api/",
+        "gumroadTag": "Gumroad",
+        "gumroadHref": "https://twirl.gumroad.com/l/Sergey-Konstantinov-The-API",
         "substackTag": "Substack",
         "substackHref": "https://twirl.substack.com/",
         "substackString": "twirl.substack.com"
@@ -101,7 +105,7 @@
         "followOn": "Follow me on",
         "follow": ["linkedin", "twitter", "substack"],
         "supportThisWork": "Support this work: buy it on",
-        "support": ["kindle", "apple"],
+        "support": ["kindle", "apple", "leanpub", "gumroad"],
         "content": [
             "<p>API-first development is one of the hottest technical topics nowadays since many companies have started to realize that APIs serves as a multiplier to their opportunities — but it amplifies the design mistakes as well.</p>",
             "<p>This book is written to share expertise and describe best practices in designing and developing APIs. It comprises six sections dedicated to the following topics:</p>",
diff --git a/src/ru/l10n.json b/src/ru/l10n.json
index 805cdf1..4090f2a 100644
--- a/src/ru/l10n.json
+++ b/src/ru/l10n.json
@@ -67,6 +67,10 @@
         "kindleHref": "https://www.amazon.com/gp/product/B09RHH44S5/",
         "appleTag": "Apple Books",
         "appleHref": "http://books.apple.com/us/book/id6467567700",
+        "leanpubTag": "Leanpub",
+        "leanpubHref": "https://leanpub.com/sergey-konstantinov-the-api/",
+        "gumroadTag": "Gumroad",
+        "gumroadHref": "https://twirl.gumroad.com/l/Sergey-Konstantinov-The-API",
         "habrHref": "https://habr.com/ru/users/forgotten/",
         "habrTag": "Хабре",
         "substackHref": "https://twirl.substack.com/",
@@ -102,7 +106,7 @@
         "follow": ["linkedin", "twitter", "substack"],
         "updates": ["habr"],
         "supportThisWork": "Поддержите эту работу: купите книгу на",
-        "support": ["kindle", "apple"],
+        "support": ["kindle", "apple", "leanpub", "gumroad"],
         "content": [
             "<p>«API-first» подход — одна из самых горячих горячих тем в разработке программного обеспечения в наше время. Многие компании начали понимать, что API выступает мультипликатором их возможностей — но также умножает и допущенные ошибки.</p>",
             "<p>Эта книга написана для того, чтобы поделиться опытом и изложить лучшие практики разработки API. Книга состоит из шести разделов, посвящённых:</p>",