diff --git a/packages/taler-wallet-webextension/src/wallet/DeveloperPage.tsx b/packages/taler-wallet-webextension/src/wallet/DeveloperPage.tsx
index ee0986076..2db2041d4 100644
--- a/packages/taler-wallet-webextension/src/wallet/DeveloperPage.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/DeveloperPage.tsx
@@ -171,6 +171,7 @@ export function View({
       [exchange_name: string]: CalculatedCoinfInfo[];
     },
   );
+  const exchanges = Object.keys(money_by_exchange);
 
   const [tagName, setTagName] = useState("");
   const [logLevel, setLogLevel] = useState("info");
@@ -317,6 +318,42 @@ export function View({
           >
             <i18n.Translate>Remove ext+taler:// handler</i18n.Translate>
           </Button>
+        </Grid>
+        <Grid item>
+          <Button
+            variant="contained"
+            onClick={async () => {
+              const result = await Promise.all(
+                exchanges.map(async (ex) => {
+                  const oldKeys = JSON.stringify(
+                    await (await fetch(`${ex}keys`)).json(),
+                  );
+                  const oldWire = JSON.stringify(
+                    await (await fetch(`${ex}wire`)).json(),
+                  );
+                  const newKeys = JSON.stringify(
+                    await (
+                      await fetch(`${ex}keys`, { cache: "no-cache" })
+                    ).json(),
+                  );
+                  const newWire = JSON.stringify(
+                    await (
+                      await fetch(`${ex}wire`, { cache: "no-cache" })
+                    ).json(),
+                  );
+                  return oldKeys !== newKeys || newWire !== oldWire;
+                }),
+              );
+              const ex = exchanges.filter((e, i) => result[i]);
+              if (!ex.length) {
+                alert("no exchange was outdated");
+              } else {
+                alert(`found some exchange out of date: ${result.join(", ")}`);
+              }
+            }}
+          >
+            <i18n.Translate>Clear exchange key cache</i18n.Translate>
+          </Button>
         </Grid>{" "}
       </Grid>
       <Paper style={{ padding: 10, margin: 10 }}>