diff --git a/backend/src/api/mining/mining-routes.ts b/backend/src/api/mining/mining-routes.ts
index 1c9a0de30..77cb63e96 100644
--- a/backend/src/api/mining/mining-routes.ts
+++ b/backend/src/api/mining/mining-routes.ts
@@ -41,6 +41,10 @@ class MiningRoutes {
       res.header('Pragma', 'public');
       res.header('Cache-control', 'public');
       res.setHeader('Expires', new Date(Date.now() + 1000 * 300).toUTCString());
+      if (['testnet', 'signet', 'liquidtestnet'].includes(config.MEMPOOL.NETWORK)) {
+        res.status(400).send('Prices are not available on testnets.');
+        return;
+      }
       if (req.query.timestamp) {
         res.status(200).send(await PricesRepository.$getNearestHistoricalPrice(
           parseInt(<string>req.query.timestamp ?? 0, 10)