diff --git a/src/Service/Provider/ProviderInterface.php b/src/Service/Provider/ProviderInterface.php
index 015b559..c8203f8 100644
--- a/src/Service/Provider/ProviderInterface.php
+++ b/src/Service/Provider/ProviderInterface.php
@@ -6,8 +6,11 @@ namespace App\Service\Provider;
 
 interface ProviderInterface
 {
+    /** Fire the HTTP request(s) without blocking; returns an opaque handle for resolveFetch(). */
+    public function startFetch(): mixed;
+
     /** @return array<string, int>  date (Y-m-d) => contribution count */
-    public function fetch(): array;
+    public function resolveFetch(mixed $handle): array;
 
     public function isConfigured(): bool;