diff --git a/web/ChainSourceCard.tsx b/web/ChainSourceCard.tsx
index ac711f9..71d0c2f 100644
--- a/web/ChainSourceCard.tsx
+++ b/web/ChainSourceCard.tsx
@@ -49,8 +49,18 @@ const KINDS: Record<ChainKind, KindMeta> = {
 };
 
 export const ChainSourceCard = () => {
-  const { data, isLoading } = useServiceConnection<ChainState>('wallet');
-  const { save, forget } = useServiceConnectionActions<{ url: string; kind: ChainKind }, SaveResult>('wallet');
+  // 'bitcoin-wallet' is the MOUNT name, not a credential key: these hooks build `/${service}/_config`,
+  // so this must match where the plugin is mounted. It said 'wallet' until the plugin was renamed on
+  // 2026-08-19, after which every request here 404'd — and the symptom was not an error but a DISABLED
+  // Save button, because `data` stayed undefined, the seeding effect returned early, and `url` never
+  // left ''. The URL visible in the field was the placeholder.
+  //
+  // The credential rows are keyed on the PROTOCOL ('esplora' / 'nbxplorer'), written by the sidecar's
+  // config.ts — those are untouched by any rename here.
+  const { data, isLoading } = useServiceConnection<ChainState>('bitcoin-wallet');
+  const { save, forget } = useServiceConnectionActions<{ url: string; kind: ChainKind }, SaveResult>(
+    'bitcoin-wallet',
+  );
 
   const [url, setUrl] = useState('');
   const [kind, setKind] = useState<ChainKind>('esplora');