diff --git a/frontend/.env.example b/frontend/.env.example
index b902a17..b7f4d3d 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -6,7 +6,7 @@
 NEXT_PUBLIC_NETWORK=TESTNET
 
 # Soroban RPC endpoint used for transaction simulation and submission.
-NEXT_PUBLIC_SOROBAN_RPC_URL=https://your-soroban-rpc.example.com
+NEXT_PUBLIC_SOROBAN_RPC_URL=https://soroban-testnet.stellar.org
 
 # Stellar network passphrase used when signing transactions.
 NEXT_PUBLIC_STELLAR_NETWORK_PASSPHRASE="Test SDF Network ; September 2015"
@@ -25,3 +25,22 @@ NEXT_PUBLIC_MARKETPLACE_CONTRACT_ID=CCXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
 
 # Token contract ID for the in-app payment/reward asset.
 NEXT_PUBLIC_TOKEN_CONTRACT_ID=CCXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX05
+
+# Horizon URL for account and transaction queries.
+NEXT_PUBLIC_HORIZON_URL=https://horizon-testnet.stellar.org
+
+# Transaction tunables.
+NEXT_PUBLIC_TX_TIMEOUT=30
+NEXT_PUBLIC_BASE_FEE=100
+
+# Points-to-AMT conversion threshold (points per 1 AMT).
+NEXT_PUBLIC_POINTS_PER_AMT=1000
+
+# Leaderboard pagination limit.
+NEXT_PUBLIC_LEADERBOARD_LIMIT=50
+
+# Polling interval when waiting for a transaction to complete (ms).
+NEXT_PUBLIC_POLL_INTERVAL_MS=1000
+
+# Tick interval used by the accrual counter (ms).
+NEXT_PUBLIC_COUNTER_TICK_MS=1000