diff --git a/backend/app.py b/backend/app.py
index 50a7cbc..a8ff86c 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -48,6 +48,7 @@ SQUARE_API_BASE = "https://connect.squareup.com"
 SQUARE_API_VERSION = "2026-01-22"
 SQUARE_WEBHOOK_LOG = str(BASE_DIR / "logs" / "square_webhook_events.log")
 ORACLE_BASE_URL = os.getenv("ORACLE_BASE_URL", "https://monitor.outsidethebox.top")
+CRYPTO_EVM_PAYMENT_ADDRESS = os.getenv("OTB_BILLING_CRYPTO_EVM_ADDRESS", "0x44f6c44C42e6ae0392E7289F032384C0d37F56D5")