diff --git a/shared/constants.json b/shared/constants.json
index 20acff4..4e1615d 100644
--- a/shared/constants.json
+++ b/shared/constants.json
@@ -19,6 +19,10 @@
     "BUY": "buy",
     "SELL": "sell"
   },
+  "bitcoinTransferMethods": {
+    "ONCHAIN": "onchain",
+    "LIGHTNING": "lightning"
+  },
   "exchange": {
     "slotDurationMinutes": 15,
     "maxAdvanceDays": 30,
@@ -28,7 +32,8 @@
     "eurTradeIncrement": 20,
     "premiumPercentage": 5,
     "priceRefreshSeconds": 60,
-    "priceStalenessSeconds": 300
+    "priceStalenessSeconds": 300,
+    "lightningMaxEur": 1000
   },
   "validation": {
     "telegram": {