diff --git a/yarn-project/blob-sink/src/archive/factory.ts b/yarn-project/blob-sink/src/archive/factory.ts
index 225cc324053a..d5816d3542eb 100644
--- a/yarn-project/blob-sink/src/archive/factory.ts
+++ b/yarn-project/blob-sink/src/archive/factory.ts
@@ -8,9 +8,9 @@ export function createBlobArchiveClient(config: BlobSinkConfig): BlobArchiveClie
   }
 
   if (config.l1ChainId === 1) {
-    return new BlobscanArchiveClient('api.blobscan.com');
+    return new BlobscanArchiveClient('https://api.blobscan.com');
   } else if (config.l1ChainId === 11155111) {
-    return new BlobscanArchiveClient('api.sepolia.blobscan.com');
+    return new BlobscanArchiveClient('https://api.sepolia.blobscan.com');
   }
 
   return undefined;