diff --git a/blockchain/common/utils.go b/blockchain/common/utils.go
new file mode 100644
index 0000000..5908820
--- /dev/null
+++ b/blockchain/common/utils.go
@@ -0,0 +1,23 @@
+package common
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+)
+
+func GetABI(abistr string) (*abi.ABI, error) {
+	// Retrieve or create AbiEntry
+	// ...
+
+	parsedABI, err := abi.JSON(strings.NewReader(abistr))
+	if err != nil {
+		fmt.Println("string: ", abistr)
+		fmt.Println("Error parsing ABI: ", err)
+		return nil, err
+	}
+
+	return &parsedABI, nil
+
+}
diff --git a/blockchain/settings.go b/blockchain/settings.go
new file mode 100644
index 0000000..55aae1c
--- /dev/null
+++ b/blockchain/settings.go
@@ -0,0 +1,94 @@
+package blockchain
+
+import (
+	"fmt"
+	"os"
+)
+
+var BlockchainURLs map[string]string
+
+func CheckVariablesForBlockchains() error {
+
+	MOONSTREAM_NODE_ETHEREUM_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_ETHEREUM_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_ETHEREUM_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_ETHEREUM_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_POLYGON_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_POLYGON_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_POLYGON_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_POLYGON_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_ARBITRUM_ONE_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_ARBITRUM_ONE_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_ARBITRUM_ONE_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_ARBITRUM_ONE_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_ARBITRUM_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_ARBITRUM_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_ARBITRUM_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_ARBITRUM_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_GAME7_ORBIT_ARBITRUM_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_GAME7_ORBIT_ARBITRUM_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_GAME7_ORBIT_ARBITRUM_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_GAME7_ORBIT_ARBITRUM_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_XAI_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_XAI_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_XAI_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_XAI_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_XAI_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_XAI_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_XAI_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_XAI_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_MANTLE_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_MANTLE_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_MANTLE_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_MANTLE_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_MANTLE_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_MANTLE_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_MANTLE_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_MANTLE_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_IMX_ZKEVM_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_IMX_ZKEVM_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_IMX_ZKEVM_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_IMX_ZKEVM_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_IMX_ZKEVM_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_IMX_ZKEVM_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_IMX_ZKEVM_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_IMX_ZKEVM_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+	MOONSTREAM_NODE_GAME7_TESTNET_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_GAME7_TESTNET_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_GAME7_TESTNET_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_GAME7_TESTNET_A_EXTERNAL_URI environment variable is required")
+	}
+
+	MOONSTREAM_NODE_B3_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_B3_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_B3_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_B3_A_EXTERNAL_URI environment variable is required")
+	}
+
+	MOONSTREAM_NODE_B3_SEPOLIA_A_EXTERNAL_URI := os.Getenv("MOONSTREAM_NODE_B3_SEPOLIA_A_EXTERNAL_URI")
+	if MOONSTREAM_NODE_B3_SEPOLIA_A_EXTERNAL_URI == "" {
+		return fmt.Errorf("MOONSTREAM_NODE_B3_SEPOLIA_A_EXTERNAL_URI environment variable is required")
+	}
+
+	BlockchainURLs = map[string]string{
+		"ethereum":                     MOONSTREAM_NODE_ETHEREUM_A_EXTERNAL_URI,
+		"sepolia":                      MOONSTREAM_NODE_SEPOLIA_A_EXTERNAL_URI,
+		"polygon":                      MOONSTREAM_NODE_POLYGON_A_EXTERNAL_URI,
+		"arbitrum_one":                 MOONSTREAM_NODE_ARBITRUM_ONE_A_EXTERNAL_URI,
+		"arbitrum_sepolia":             MOONSTREAM_NODE_ARBITRUM_SEPOLIA_A_EXTERNAL_URI,
+		"game7_orbit_arbitrum_sepolia": MOONSTREAM_NODE_GAME7_ORBIT_ARBITRUM_SEPOLIA_A_EXTERNAL_URI,
+		"game7_testnet":                MOONSTREAM_NODE_GAME7_TESTNET_A_EXTERNAL_URI,
+		"xai":                          MOONSTREAM_NODE_XAI_A_EXTERNAL_URI,
+		"xai_sepolia":                  MOONSTREAM_NODE_XAI_SEPOLIA_A_EXTERNAL_URI,
+		"mantle":                       MOONSTREAM_NODE_MANTLE_A_EXTERNAL_URI,
+		"mantle_sepolia":               MOONSTREAM_NODE_MANTLE_SEPOLIA_A_EXTERNAL_URI,
+		"imx_zkevm":                    MOONSTREAM_NODE_IMX_ZKEVM_A_EXTERNAL_URI,
+		"imx_zkevm_sepolia":            MOONSTREAM_NODE_IMX_ZKEVM_SEPOLIA_A_EXTERNAL_URI,
+		"b3":                           MOONSTREAM_NODE_B3_A_EXTERNAL_URI,
+		"b3_sepolia":                   MOONSTREAM_NODE_B3_SEPOLIA_A_EXTERNAL_URI,
+	}
+
+	return nil
+}