diff --git a/op-ufm/op-ufm/example.config.toml b/op-ufm/op-ufm/example.config.toml
index 9a88341..418910d 100644
--- a/op-ufm/op-ufm/example.config.toml
+++ b/op-ufm/op-ufm/example.config.toml
@@ -16,7 +16,7 @@ enabled = true
 # Host for the healthz endpoint to listen on
 host = "0.0.0.0"
 # Port for the above.
-port = 8080
+port = "8080"
 
 [metrics]
 # Whether or not to enable Prometheus metrics
@@ -24,7 +24,7 @@ enabled = true
 # Host for the Prometheus metrics endpoint to listen on.
 host = "0.0.0.0"
 # Port for the above.
-port = 9761
+port = "9761"
 
 [wallets.default]
 # OP Stack Chain ID
diff --git a/op-ufm/op-ufm/pkg/config/config.go b/op-ufm/op-ufm/pkg/config/config.go
index 3b8bb86..39c96ce 100644
--- a/op-ufm/op-ufm/pkg/config/config.go
+++ b/op-ufm/op-ufm/pkg/config/config.go
@@ -29,13 +29,13 @@ type MetricsConfig struct {
 	Enabled bool   `toml:"enabled"`
 	Debug   bool   `toml:"debug"`
 	Host    string `toml:"host"`
-	Port    int    `toml:"port"`
+	Port    string `toml:"port"`
 }
 
 type HealthzConfig struct {
 	Enabled bool   `toml:"enabled"`
 	Host    string `toml:"host"`
-	Port    int    `toml:"port"`
+	Port    string `toml:"port"`
 }
 
 type WalletConfig struct {
@@ -80,12 +80,12 @@ func New(file string) (*Config, error) {
 
 func (c *Config) Validate() error {
 	if c.Metrics.Enabled {
-		if c.Metrics.Host == "" || c.Metrics.Port == 0 {
+		if c.Metrics.Host == "" || c.Metrics.Port == "" {
 			return errors.New("metrics is enabled but host or port are missing")
 		}
 	}
 	if c.Healthz.Enabled {
-		if c.Healthz.Host == "" || c.Healthz.Port == 0 {
+		if c.Healthz.Host == "" || c.Healthz.Port == "" {
 			return errors.New("healthz is enabled but host or port are missing")
 		}
 	}
diff --git a/op-ufm/op-ufm/pkg/metrics/clients/eth.go b/op-ufm/op-ufm/pkg/metrics/clients/eth.go
index 791b2d9..8b2f89e 100644
--- a/op-ufm/op-ufm/pkg/metrics/clients/eth.go
+++ b/op-ufm/op-ufm/pkg/metrics/clients/eth.go
@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"github.com/ethereum-optimism/optimism/op-ufm/pkg/metrics"
+	"github.com/ethereum/go-ethereum/log"
 
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
@@ -32,7 +33,9 @@ func Dial(providerName string, url string) (*InstrumentedEthClient, error) {
 
 func (i *InstrumentedEthClient) TransactionByHash(ctx context.Context, hash common.Hash) (*types.Transaction, bool, error) {
 	start := time.Now()
+	log.Debug(">> TransactionByHash", "hash", hash, "provider", i.providerName)
 	tx, isPending, err := i.c.TransactionByHash(ctx, hash)
+	log.Debug("<< TransactionByHash", "tx", tx, "isPending", isPending, "err", err, "hash", hash, "provider", i.providerName)
 	if err != nil {
 		if !i.ignorableErrors(err) {
 			metrics.RecordError(i.providerName, "ethclient.TransactionByHash")
diff --git a/op-ufm/op-ufm/pkg/service/healthz_server.go b/op-ufm/op-ufm/pkg/service/healthz_server.go
index 9bfd2ed..aed2425 100644
--- a/op-ufm/op-ufm/pkg/service/healthz_server.go
+++ b/op-ufm/op-ufm/pkg/service/healthz_server.go
@@ -2,7 +2,6 @@ package service
 
 import (
 	"context"
-	"fmt"
 	"net/http"
 
 	"github.com/gorilla/mux"
@@ -14,10 +13,9 @@ type HealthzServer struct {
 	server *http.Server
 }
 
-func (h *HealthzServer) Start(ctx context.Context, host string, port int) error {
+func (h *HealthzServer) Start(ctx context.Context, addr string) error {
 	hdlr := mux.NewRouter()
 	hdlr.HandleFunc("/healthz", h.Handle).Methods("GET")
-	addr := fmt.Sprintf("%s:%d", host, port)
 	c := cors.New(cors.Options{
 		AllowedOrigins: []string{"*"},
 	})
diff --git a/op-ufm/op-ufm/pkg/service/service.go b/op-ufm/op-ufm/pkg/service/service.go
index aa746f7..04b4f6d 100644
--- a/op-ufm/op-ufm/pkg/service/service.go
+++ b/op-ufm/op-ufm/pkg/service/service.go
@@ -2,7 +2,7 @@ package service
 
 import (
 	"context"
-	"fmt"
+	"net"
 
 	"github.com/ethereum-optimism/optimism/op-ufm/pkg/config"
 	"github.com/ethereum-optimism/optimism/op-ufm/pkg/metrics"
@@ -31,10 +31,10 @@ func New(cfg *config.Config) *Service {
 func (s *Service) Start(ctx context.Context) {
 	log.Info("service starting")
 	if s.Config.Healthz.Enabled {
-		addr := fmt.Sprintf("%s:%d", s.Config.Healthz.Host, s.Config.Healthz.Port)
+		addr := net.JoinHostPort(s.Config.Healthz.Host, s.Config.Healthz.Port)
 		log.Info("starting healthz server", "addr", addr)
 		go func() {
-			if err := s.Healthz.Start(ctx, s.Config.Healthz.Host, s.Config.Healthz.Port); err != nil {
+			if err := s.Healthz.Start(ctx, addr); err != nil {
 				log.Error("error starting healthz server", "err", err)
 			}
 		}()
@@ -42,7 +42,7 @@ func (s *Service) Start(ctx context.Context) {
 
 	metrics.Debug = s.Config.Metrics.Debug
 	if s.Config.Metrics.Enabled {
-		addr := fmt.Sprintf("%s:%d", s.Config.Metrics.Host, s.Config.Metrics.Port)
+		addr := net.JoinHostPort(s.Config.Metrics.Host, s.Config.Metrics.Port)
 		log.Info("starting metrics server", "addr", addr)
 		go func() {
 			if err := s.Metrics.Start(ctx, addr); err != nil {