diff --git a/modules/rcal/components/folk-calendar-view.ts b/modules/rcal/components/folk-calendar-view.ts
index fa1eed2..bcaddd0 100644
--- a/modules/rcal/components/folk-calendar-view.ts
+++ b/modules/rcal/components/folk-calendar-view.ts
@@ -348,8 +348,12 @@ class FolkCalendarView extends HTMLElement {
 	// ── API ──
 
 	private getApiBase(): string {
-		const match = window.location.pathname.match(/^\/([^/]+)\/cal/);
-		return match ? `/${match[1]}/cal` : "";
+		// When on the rcal page directly, extract from URL
+		const match = window.location.pathname.match(/^\/([^/]+)\/rcal/);
+		if (match) return `/${match[1]}/rcal`;
+		// When embedded as a canvas shape, use the space attribute
+		if (this.space) return `/${this.space}/rcal`;
+		return "";
 	}
 
 	private async loadMonth() {