diff --git a/internal/start/start.go b/internal/start/start.go
index 5a5cec56c6..11c19400a9 100644
--- a/internal/start/start.go
+++ b/internal/start/start.go
@@ -1162,7 +1162,7 @@ EOF
 					"STUDIO_PG_META_URL=http://" + utils.PgmetaId + ":8080",
 					"POSTGRES_PASSWORD=" + dbConfig.Password,
 					"SUPABASE_URL=http://" + utils.KongId + ":8000",
-					"SUPABASE_PUBLIC_URL=" + utils.Config.Studio.ApiUrl,
+					"SUPABASE_PUBLIC_URL=" + utils.Config.Api.ExternalUrl,
 					"AUTH_JWT_SECRET=" + utils.Config.Auth.JwtSecret.Value,
 					"SUPABASE_ANON_KEY=" + utils.Config.Auth.AnonKey.Value,
 					"SUPABASE_SERVICE_KEY=" + utils.Config.Auth.ServiceRoleKey.Value,
diff --git a/pkg/config/api.go b/pkg/config/api.go
index 3fd3b6f187..fdeb2b1ff5 100644
--- a/pkg/config/api.go
+++ b/pkg/config/api.go
@@ -15,12 +15,11 @@ type (
 		ExtraSearchPath []string `toml:"extra_search_path" json:"extra_search_path"`
 		MaxRows         uint     `toml:"max_rows" json:"max_rows"`
 		// Local only config
-		Image     string  `toml:"-" json:"-"`
-		KongImage string  `toml:"-" json:"-"`
-		Port      uint16  `toml:"port" json:"port"`
-		Tls       tlsKong `toml:"tls" json:"tls"`
-		// TODO: replace [auth|studio].api_url
-		ExternalUrl string `toml:"external_url" json:"external_url"`
+		Image     string  `toml:"-"`
+		KongImage string  `toml:"-"`
+		Port      uint16  `toml:"port"`
+		Tls       tlsKong `toml:"tls"`
+		ExternalUrl string `toml:"external_url"`
 	}
 
 	tlsKong struct {
diff --git a/pkg/config/config.go b/pkg/config/config.go
index a49e84d7df..7a9cc7198b 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -172,7 +172,6 @@ type (
 		Enabled      bool   `toml:"enabled" json:"enabled"`
 		Image        string `toml:"-" json:"-"`
 		Port         uint16 `toml:"port" json:"port"`
-		ApiUrl       string `toml:"api_url" json:"api_url"`
 		OpenaiApiKey Secret `toml:"openai_api_key" json:"openai_api_key"`
 		PgmetaImage  string `toml:"-" json:"-"`
 	}
@@ -857,11 +856,6 @@ func (c *config) Validate(fsys fs.FS) error {
 		if c.Studio.Port == 0 {
 			return errors.New("Missing required field in config: studio.port")
 		}
-		if parsed, err := url.Parse(c.Studio.ApiUrl); err != nil {
-			return errors.Errorf("Invalid config for studio.api_url: %w", err)
-		} else if parsed.Host == "" || parsed.Host == c.Hostname {
-			c.Studio.ApiUrl = c.Api.ExternalUrl
-		}
 	}
 	// Validate smtp config
 	if c.Inbucket.Enabled {
diff --git a/pkg/config/templates/config.toml b/pkg/config/templates/config.toml
index 44b58cdb0c..13b143b2f4 100644
--- a/pkg/config/templates/config.toml
+++ b/pkg/config/templates/config.toml
@@ -16,6 +16,8 @@ extra_search_path = ["public", "extensions"]
 # The maximum number of rows returns from a view, table, or stored procedure. Limits payload size
 # for accidental or malicious requests.
 max_rows = 1000
+# External URL of the API server that frontend connects to. Defaults to http(s)://hostname:api.port when empty.
+# external_url = ""
 
 [api.tls]
 # Enable HTTPS endpoints locally using a self-signed certificate.
@@ -89,8 +91,6 @@ enabled = true
 enabled = true
 # Port to use for Supabase Studio.
 port = 54323
-# External URL of the API server that frontend connects to.
-api_url = "http://127.0.0.1"
 # OpenAI API Key to use for Supabase AI in the Supabase Studio.
 openai_api_key = "env(OPENAI_API_KEY)"
 
diff --git a/pkg/config/testdata/config.toml b/pkg/config/testdata/config.toml
index b228a9c073..0f30fa2c9b 100644
--- a/pkg/config/testdata/config.toml
+++ b/pkg/config/testdata/config.toml
@@ -89,8 +89,6 @@ max_header_length = 8192
 enabled = true
 # Port to use for Supabase Studio.
 port = 54323
-# External URL of the API server that frontend connects to.
-api_url = "http://127.0.0.1"
 # OpenAI API Key to use for Supabase AI in the Supabase Studio.
 openai_api_key = "env(OPENAI_API_KEY)"