diff --git a/config/networks.go b/config/networks.go
index b5bbf8d..78e297c 100644
--- a/config/networks.go
+++ b/config/networks.go
@@ -1,20 +1,180 @@
 package config
-
+import (
+	"fmt"
+	"github.com/BlocSoc-iitr/selene/common"
+	"github.com/pkg/errors"
+	"os"
+	"path/filepath"
+	"strings"
+)
 type Network string
-
 const (
 	MAINNET Network = "MAINNET"
 	GOERLI  Network = "GOERLI"
 	SEPOLIA Network = "SEPOLIA"
 )
-
-// hardcode the base configurations for each of the networks
-// check s and write switch case
-func (n Network) base_config(s string) (BaseConfig, error) {
-
+func (n Network) baseConfig(s string) (BaseConfig, error) {
+	switch strings.ToUpper(s) {
+	case "MAINNET":
+		config, err := Mainnet()
+		if err != nil {
+			return BaseConfig{}, err
+		}
+		return config, nil
+	case "GOERLI":
+		config, err := Goerli()
+		if err != nil {
+			return BaseConfig{}, err
+		}
+		return config, nil
+	case "SEPOLIA":
+		config, err := Sepolia()
+		if err != nil {
+			return BaseConfig{}, err
+		}
+		return config, nil
+	default:
+		return BaseConfig{}, errors.New("network not recognized")
+	}
+}
+func (n Network) chainID(s string) (uint64, error) {
+	switch strings.ToUpper(s) {
+	case "MAINNET":
+		return 1, nil
+	case "GOERLI":
+		return 5, nil
+	case "SEPOLIA":
+		return 11155111, nil
+	default:
+		return 0, errors.New("network not recognized")
+	}
+}
+func dataDir(network Network) (string, error) {
+    homeDir, err := os.UserHomeDir()
+    if err != nil {
+        return "", fmt.Errorf("failed to get user home directory: %w", err)
+    }
+    path := filepath.Join(homeDir, fmt.Sprintf("selene/data/%s", strings.ToLower(string(network))))
+    return path, nil
+}
+func Mainnet() (BaseConfig, error) {
+	defaultCheckpoint, err := common.Hex_str_to_bytes("c7fc7b2f4b548bfc9305fa80bc1865ddc6eea4557f0a80507af5dc34db7bd9ce")
+	if err != nil {
+		return BaseConfig{}, fmt.Errorf("failed to parse default checkpoint: %w", err)
+	}
+	genesisRoot, err := common.Hex_str_to_bytes("4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95")
+	if err != nil {
+		return BaseConfig{}, fmt.Errorf("failed to parse genesis root: %w", err)
+	}
+	consensusRPC := "https://www.lightclientdata.org"
+	dataDir := dataDir(MAINNET)
+	return BaseConfig{
+		DefaultCheckpoint: defaultCheckpoint,
+		RpcPort:           8545,
+		ConsensusRpc:      &consensusRPC,
+		Chain: ChainConfig{
+			ChainID:     1,
+			GenesisTime: 1606824023,
+			GenesisRoot: genesisRoot,
+		},
+		Forks: Forks{
+			Genesis: Fork{
+				Epoch:       0,
+				ForkVersion: []byte{0x00, 0x00, 0x00, 0x00}},
+			Altair: Fork{
+				Epoch:       74240,
+				ForkVersion: []byte{0x01, 0x00, 0x00, 0x00}},
+			Bellatrix: Fork{
+				Epoch:       144896,
+				ForkVersion: []byte{0x02, 0x00, 0x00, 0x00}},
+			Capella: Fork{
+				Epoch:       194048,
+				ForkVersion: []byte{0x03, 0x00, 0x00, 0x00}},
+			Deneb: Fork{
+				Epoch:       269568,
+				ForkVersion: []byte{0x04, 0x00, 0x00, 0x00}},
+		},
+		MaxCheckpointAge: 1_209_600, // 14 days
+		DataDir:        dataDir,
+	}, nil
+}
+func Goerli() (BaseConfig, error) {
+	defaultCheckpoint, err := common.Hex_str_to_bytes("f6e9d5fdd7c406834e888961beab07b2443b64703c36acc1274ae1ce8bb48839")
+	if err != nil {
+		return BaseConfig{}, fmt.Errorf("failed to parse default checkpoint: %w", err)
+	}
+	genesisRoot, err := common.Hex_str_to_bytes("043db0d9a83813551ee2f33450d23797757d430911a9320530ad8a0eabc43efb")
+	if err != nil {
+		return BaseConfig{}, fmt.Errorf("failed to parse genesis root: %w", err)
+	}
+	dataDir := dataDir(GOERLI)
+	return BaseConfig{
+		DefaultCheckpoint: defaultCheckpoint,
+		RpcPort:           8545,
+		ConsensusRpc:      nil,
+		Chain: ChainConfig{
+			ChainID:     5,
+			GenesisTime: 1616508000,
+			GenesisRoot: genesisRoot,
+		},
+		Forks: Forks{
+			Genesis: Fork{
+				Epoch:       0,
+				ForkVersion: []byte{0x00, 0x10, 0x20, 0x00}},
+			Altair: Fork{
+				Epoch:       36660,
+				ForkVersion: []byte{0x01, 0x10, 0x20, 0x00}},
+			Bellatrix: Fork{
+				Epoch:       112260,
+				ForkVersion: []byte{0x02, 0x10, 0x20, 0x00}},
+			Capella: Fork{
+				Epoch:       162304,
+				ForkVersion: []byte{0x03, 0x10, 0x20, 0x00}},
+			Deneb: Fork{
+				Epoch:       231680,
+				ForkVersion: []byte{0x04, 0x10, 0x20, 0x00}},
+		},
+		MaxCheckpointAge: 1_209_600, // 14 days
+		DataDir:          dataDir,
+	}, nil
 }
-
-func (n Network) chain_id(s string) (uint64, error) {
-
+func Sepolia() (BaseConfig, error) {
+	defaultCheckpoint, err := common.Hex_str_to_bytes("4135bf01bddcfadac11143ba911f1c7f0772fdd6b87742b0bc229887bbf62b48")
+	if err != nil {
+		return BaseConfig{}, fmt.Errorf("failed to parse default checkpoint: %w", err)
+	}
+	genesisRoot, err := common.Hex_str_to_bytes("d8ea171f3c94aea21ebc42a1ed61052acf3f9209c00e4efbaaddac09ed9b8078")
+	if err != nil {
+		return BaseConfig{}, fmt.Errorf("failed to parse genesis root: %w", err)
+	}
+	dataDir := dataDir(SEPOLIA)
+	return BaseConfig{
+		DefaultCheckpoint: defaultCheckpoint,
+		RpcPort:           8545,
+		ConsensusRpc:      nil,
+		Chain: ChainConfig{
+			ChainID:     11155111,
+			GenesisTime: 1655733600,
+			GenesisRoot: genesisRoot,
+		},
+		Forks: Forks{
+			Genesis: Fork{
+				Epoch:       0,
+				ForkVersion: []byte{0x90, 0x00, 0x00, 0x69}},
+			Altair: Fork{
+				Epoch:       50,
+				ForkVersion: []byte{0x90, 0x00, 0x00, 0x70}},
+			Bellatrix: Fork{
+				Epoch:       100,
+				ForkVersion: []byte{0x90, 0x00, 0x00, 0x71}},
+			Capella: Fork{
+				Epoch:       56832,
+				ForkVersion: []byte{0x90, 0x00, 0x00, 0x72}},
+			Deneb: Fork{
+				Epoch:       132608,
+				ForkVersion: []byte{0x90, 0x00, 0x00, 0x73}},
+		},
+		MaxCheckpointAge: 1_209_600, // 14 days
+		DataDir:          dataDir,
+	}, nil
 }
-func data_dir() {}