diff --git a/src/services/rate_service.rs b/src/services/rate_service.rs
deleted file mode 100644
index 745f225..0000000
--- a/src/services/rate_service.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-// RateService: cached XLM/USD exchange rate
-// - fetches from Stellar Horizon every 30s
-// - uses tokio::sync::RwLock for concurrent access
-// - returns cached value on Horizon error
-// Added by Zara Mensah (#147)
-pub const RATE_SERVICE_VERSION: &str = "1.0";