diff --git a/cmd/solana_exporter/exporter.go b/cmd/solana_exporter/exporter.go
index da6268a..69ec47d 100644
--- a/cmd/solana_exporter/exporter.go
+++ b/cmd/solana_exporter/exporter.go
@@ -50,10 +50,6 @@ type SolanaCollector struct {
 	NodeFirstAvailableBlock *GaugeDesc
 }
 
-func init() {
-	slog.Init()
-}
-
 func NewSolanaCollector(provider rpc.Provider, config *ExporterConfig) *SolanaCollector {
 	collector := &SolanaCollector{
 		rpcClient: provider,
diff --git a/pkg/rpc/client.go b/pkg/rpc/client.go
index 1c2fb59..522ae94 100644
--- a/pkg/rpc/client.go
+++ b/pkg/rpc/client.go
@@ -35,49 +35,57 @@ type (
 // It provides methods to retrieve block production information, epoch info, slot info, vote accounts, and node version.
 type Provider interface {
 
-	// GetBlockProduction retrieves the block production information for the specified slot range.
-	// The method takes a context for cancellation, and pointers to the first and last slots of the range.
-	// It returns a BlockProduction struct containing the block production details, or an error if the operation fails.
+	// GetBlockProduction returns recent block production information from the current or previous epoch.
+	// See API docs: https://solana.com/docs/rpc/http/getblockproduction
 	GetBlockProduction(
 		ctx context.Context, commitment Commitment, identity *string, firstSlot *int64, lastSlot *int64,
 	) (*BlockProduction, error)
 
-	// GetEpochInfo retrieves the information regarding the current epoch.
-	// The method takes a context for cancellation and a commitment level to specify the desired state.
-	// It returns a pointer to an EpochInfo struct containing the epoch details, or an error if the operation fails.
+	// GetEpochInfo returns information about the current epoch.
+	// See API docs: https://solana.com/docs/rpc/http/getepochinfo
 	GetEpochInfo(ctx context.Context, commitment Commitment) (*EpochInfo, error)
 
-	// GetSlot retrieves the current slot number.
-	// The method takes a context for cancellation.
-	// It returns the current slot number as an int64, or an error if the operation fails.
+	// GetSlot returns the slot that has reached the given or default commitment level.
+	// See API docs: https://solana.com/docs/rpc/http/getslot
 	GetSlot(ctx context.Context, commitment Commitment) (int64, error)
 
-	// GetVoteAccounts retrieves the vote accounts information.
-	// The method takes a context for cancellation and a slice of parameters to filter the vote accounts.
-	// It returns a pointer to a VoteAccounts struct containing the vote accounts details,
-	// or an error if the operation fails.
+	// GetVoteAccounts returns the account info and associated stake for all the voting accounts in the current bank.
+	// See API docs: https://solana.com/docs/rpc/http/getvoteaccounts
 	GetVoteAccounts(ctx context.Context, commitment Commitment, votePubkey *string) (*VoteAccounts, error)
 
-	// GetVersion retrieves the version of the Solana node.
-	// The method takes a context for cancellation.
-	// It returns a string containing the version information, or an error if the operation fails.
+	// GetVersion returns the current Solana version running on the node.
+	// See API docs: https://solana.com/docs/rpc/http/getversion
 	GetVersion(ctx context.Context) (string, error)
 
-	// GetBalance returns the SOL balance of the account at the provided address
+	// GetBalance returns the lamport balance of the account of provided pubkey.
+	// See API docs:https://solana.com/docs/rpc/http/getbalance
 	GetBalance(ctx context.Context, commitment Commitment, address string) (float64, error)
 
-	// GetInflationReward returns the inflation rewards (in lamports) awarded to the given addresses (vote accounts)
-	// during the given epoch.
+	// GetInflationReward returns the inflation / staking reward for a list of addresses for an epoch.
+	// See API docs: https://solana.com/docs/rpc/http/getinflationreward
 	GetInflationReward(
 		ctx context.Context, commitment Commitment, addresses []string, epoch *int64, minContextSlot *int64,
 	) ([]InflationReward, error)
 
+	// GetLeaderSchedule returns the leader schedule for an epoch.
+	// See API docs: https://solana.com/docs/rpc/http/getleaderschedule
 	GetLeaderSchedule(ctx context.Context, commitment Commitment, slot int64) (map[string][]int64, error)
 
+	// GetBlock returns identity and transaction information about a confirmed block in the ledger.
+	// See API docs: https://solana.com/docs/rpc/http/getblock
 	GetBlock(ctx context.Context, commitment Commitment, slot int64, transactionDetails string) (*Block, error)
 
+	// GetHealth returns the current health of the node. A healthy node is one that is within a blockchain-configured slots
+	// of the latest cluster confirmed slot.
+	// See API docs: https://solana.com/docs/rpc/http/gethealth
 	GetHealth(ctx context.Context) (*string, error)
+
+	// GetMinimumLedgerSlot returns the lowest slot that the node has information about in its ledger.
+	// See API docs: https://solana.com/docs/rpc/http/minimumledgerslot
 	GetMinimumLedgerSlot(ctx context.Context) (*int64, error)
+
+	// GetFirstAvailableBlock returns the slot of the lowest confirmed block that has not been purged from the ledger
+	// See API docs: https://solana.com/docs/rpc/http/getfirstavailableblock
 	GetFirstAvailableBlock(ctx context.Context) (*int64, error)
 }
 
diff --git a/pkg/rpc/mock/server.go b/pkg/rpc/server.go
similarity index 69%
rename from pkg/rpc/mock/server.go
rename to pkg/rpc/server.go
index 250b638..5016d3d 100644
--- a/pkg/rpc/mock/server.go
+++ b/pkg/rpc/server.go
@@ -15,11 +15,11 @@ import (
 type (
 	// MockServer represents a mock Solana RPC server for testing
 	MockServer struct {
-		server   *http.Server
-		listener net.Listener
-		// ResponseMap allows tests to set custom responses for specific methods
-		ResponseMap map[string]any
-		mu          sync.RWMutex
+		// Responses allows tests to set custom responses for specific methods
+		Responses map[string]any
+		server    *http.Server
+		listener  net.Listener
+		mu        sync.RWMutex
 	}
 
 	// RPCResponse represents a JSON-RPC response
@@ -32,13 +32,13 @@ type (
 )
 
 // NewMockServer creates a new mock server instance
-func NewMockServer() (*MockServer, error) {
+func NewMockServer(responses map[string]any) (*MockServer, error) {
 	listener, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
 		return nil, fmt.Errorf("failed to create listener: %v", err)
 	}
 
-	ms := &MockServer{listener: listener, ResponseMap: make(map[string]any)}
+	ms := &MockServer{listener: listener, Responses: responses}
 
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", ms.handleRPCRequest)
@@ -64,11 +64,17 @@ func (ms *MockServer) Close() error {
 	return ms.server.Shutdown(ctx)
 }
 
+func (ms *MockServer) MustClose() {
+	if err := ms.Close(); err != nil {
+		panic(err)
+	}
+}
+
 // SetResponse sets a custom response for a specific method
 func (ms *MockServer) SetResponse(method string, response any) {
 	ms.mu.Lock()
 	defer ms.mu.Unlock()
-	ms.ResponseMap[method] = response
+	ms.Responses[method] = response
 }
 
 func (ms *MockServer) handleRPCRequest(w http.ResponseWriter, r *http.Request) {
@@ -83,43 +89,38 @@ func (ms *MockServer) handleRPCRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	response := RPCResponse{JsonRPC: "2.0", ID: req.Id}
 	ms.mu.RLock()
-	result, exists := ms.ResponseMap[req.Method]
+	result, exists := ms.Responses[req.Method]
 	ms.mu.RUnlock()
 
 	if !exists {
 		// Fall back to default responses if no custom response is set
-		result = getDefaultResponse(req.Method)
+		response.Error = rpc.RPCError{
+			Code:    -32601,
+			Message: "Method not found",
+		}
+	} else {
+		response.Result = result
 	}
 
-	response := RPCResponse{JsonRPC: "2.0", Result: result, ID: req.Id}
-
 	w.Header().Set("Content-Type", "application/json")
-	_ = json.NewEncoder(w).Encode(response)
-}
-
-// Helper function to get default responses
-func getDefaultResponse(method string) any {
-	switch method {
-	case "getBalance":
-		return map[string]any{"context": map[string]any{"slot": 1234567}, "value": 100000000}
-	case "getSlot":
-		return 1234567
-	// Add more default responses as needed
-	default:
-		return nil
+	err := json.NewEncoder(w).Encode(response)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
 }
 
 // TestHelper is a helper struct for tests
 type TestHelper struct {
 	Server *MockServer
+	Client *rpc.Client
 	T      *testing.T
 }
 
 // NewTestHelper creates a new test helper with a running mock server
-func NewTestHelper(t *testing.T) *TestHelper {
-	server, err := NewMockServer()
+func NewTestHelper(t *testing.T, responses map[string]any) *TestHelper {
+	server, err := NewMockServer(responses)
 	if err != nil {
 		t.Fatalf("Failed to create mock server: %v", err)
 	}
@@ -130,5 +131,5 @@ func NewTestHelper(t *testing.T) *TestHelper {
 		}
 	})
 
-	return &TestHelper{Server: server, T: t}
+	return &TestHelper{Server: server, Client: rpc.NewRPCClient(server.URL(), time.Second), T: t}
 }
diff --git a/pkg/slog/main.go b/pkg/slog/main.go
index cb90a22..13aed3f 100644
--- a/pkg/slog/main.go
+++ b/pkg/slog/main.go
@@ -10,8 +10,8 @@ import (
 
 var log *zap.SugaredLogger
 
-// Init initializes the logger
-func Init() {
+// init initializes the logger
+func init() {
 	config := zap.NewProductionConfig()
 
 	// configure: