diff --git a/.changeset/forty-books-pump.md b/.changeset/forty-books-pump.md
new file mode 100644
index 0000000000..d7a8861682
--- /dev/null
+++ b/.changeset/forty-books-pump.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added API URL to `sei` chain.
diff --git a/src/chains/definitions/sei.ts b/src/chains/definitions/sei.ts
index 801da2f74a..e30e9a1ac5 100644
--- a/src/chains/definitions/sei.ts
+++ b/src/chains/definitions/sei.ts
@@ -14,6 +14,7 @@ export const sei = /*#__PURE__*/ defineChain({
     default: {
       name: 'Seitrace',
       url: 'https://seitrace.com',
+      apiUrl: 'https://seitrace.com/pacific-1/api',
     },
   },
   contracts: {