diff --git a/backend/secretapi/config.go b/backend/secretapi/config.go
index 6dbebde..8b2ace4 100644
--- a/backend/secretapi/config.go
+++ b/backend/secretapi/config.go
@@ -77,11 +77,18 @@ func (c Config) Validate() error {
 	if c.ChainID <= 0 {
 		return fmt.Errorf("SECRET_API_CHAIN_ID must be positive")
 	}
-	if strings.ToUpper(strings.TrimSpace(c.MintCurrency)) != "USDC" {
-		return fmt.Errorf("SECRET_API_MINT_CURRENCY must be USDC")
-	}
-	if c.MintDecimals != 6 {
-		return fmt.Errorf("SECRET_API_MINT_DECIMALS must be 6")
+	currency := strings.ToUpper(strings.TrimSpace(c.MintCurrency))
+	switch currency {
+	case "USDC":
+		if c.MintDecimals != 6 {
+			return fmt.Errorf("SECRET_API_MINT_DECIMALS must be 6 for USDC")
+		}
+	case "ETH":
+		if c.MintDecimals != 18 {
+			return fmt.Errorf("SECRET_API_MINT_DECIMALS must be 18 for ETH")
+		}
+	default:
+		return fmt.Errorf("SECRET_API_MINT_CURRENCY must be USDC or ETH")
 	}
 	amountRaw := strings.TrimSpace(c.MintAmountAtomic)
 	amount, ok := new(big.Int).SetString(amountRaw, 10)