diff --git a/server/http.go b/server/http.go
index 0724677d8..b6c1d42c7 100644
--- a/server/http.go
+++ b/server/http.go
@@ -105,8 +105,8 @@ func (s *HTTPd) RegisterSiteHandlers(site site.API, cache *util.Cache) {
 		"bufferstartsoc":          {"POST", "/bufferstartsoc/{value:[0-9.]+}", floatHandler(site.SetBufferStartSoc, site.GetBufferStartSoc)},
 		"batterydischargecontrol": {"POST", "/batterydischargecontrol/{value:[a-z]+}", boolHandler(site.SetBatteryDischargeControl, site.GetBatteryDischargeControl)},
 		"prioritysoc":             {"POST", "/prioritysoc/{value:[0-9.]+}", floatHandler(site.SetPrioritySoc, site.GetPrioritySoc)},
-		"residualpower":           {"POST", "/residualpower/{value:[-0-9.]+}", floatHandler(site.SetResidualPower, site.GetResidualPower)},
-		"smartcost":               {"POST", "/smartcostlimit/{value:[-0-9.]+}", updateSmartCostLimit(site)},
+		"residualpower":           {"POST", "/residualpower/{value:-?[0-9.]+}", floatHandler(site.SetResidualPower, site.GetResidualPower)},
+		"smartcost":               {"POST", "/smartcostlimit/{value:-?[0-9.]+}", updateSmartCostLimit(site)},
 		"tariff":                  {"GET", "/tariff/{tariff:[a-z]+}", tariffHandler(site)},
 		"sessions":                {"GET", "/sessions", sessionHandler},
 		"updatesession":           {"PUT", "/session/{id:[0-9]+}", updateSessionHandler},
@@ -186,7 +186,7 @@ func (s *HTTPd) RegisterSiteHandlers(site site.API, cache *util.Cache) {
 			"remotedemand":     {"POST", "/remotedemand/{demand:[a-z]+}/{source:[0-9a-zA-Z_-]+}", remoteDemandHandler(lp)},
 			"enableThreshold":  {"POST", "/enable/threshold/{value:-?[0-9.]+}", floatHandler(pass(lp.SetEnableThreshold), lp.GetEnableThreshold)},
 			"disableThreshold": {"POST", "/disable/threshold/{value:-?[0-9.]+}", floatHandler(pass(lp.SetDisableThreshold), lp.GetDisableThreshold)},
-			"smartCostLimit":   {"POST", "/smartcostlimit/{value:[0-9.]+}", floatHandler(pass(lp.SetSmartCostLimit), lp.GetSmartCostLimit)},
+			"smartCostLimit":   {"POST", "/smartcostlimit/{value:-?[0-9.]+}", floatHandler(pass(lp.SetSmartCostLimit), lp.GetSmartCostLimit)},
 			// "priority":         {"POST", "/priority/{value:[0-9.]+}", floatHandler(pass(lp.SetPriority), lp.GetPriority)},
 		}