diff --git a/config/config.go b/config/config.go
index 8f1d5f3b63b..c5e736d520e 100644
--- a/config/config.go
+++ b/config/config.go
@@ -490,7 +490,7 @@ func (cfg *Configuration) setDerivedDefaults() {
 	setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderEPlanning, "https://ads.us.e-planning.net/uspd/1/?du=https%3A%2F%2Fads.us.e-planning.net%2Fgetuid%2F1%2F5a1ad71d2d53a0f5%3F"+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Deplanning%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D%24UID")
 	// openrtb_ext.BidderFacebook doesn't have a good default.
 	// openrtb_ext.BidderGamma doesn't have a good default.
-	setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderGrid, "https://grid.bidswitch.net/sp_sync?sp_id=prebid&redir="+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Dgrid%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D%24UID")
+	setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderGrid, "https://x.bidswitch.net/check_uuid/"+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Dgrid%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D%24%7BBSW_UUID%7D?gdpr={{.GDPR}}&gdpr_consent={{.GDPRConsent}}")
 	setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderGumGum, "https://rtb.gumgum.com/usync/prbds2s?gdpr={{.GDPR}}&gdpr_consent={{.GDPRConsent}}&r="+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Dgumgum%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D")
 	setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderImprovedigital, "https://ad.360yield.com/server_match?gdpr={{.GDPR}}&gdpr_consent={{.GDPRConsent}}&r="+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Dimprovedigital%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D%7BPUB_USER_ID%7D")
 	setDefaultUsersync(cfg.Adapters, openrtb_ext.BidderIx, "https://ssum.casalemedia.com/usermatchredir?s=184932&cb="+url.QueryEscape(externalURL)+"%2Fsetuid%3Fbidder%3Dix%26gdpr%3D{{.GDPR}}%26gdpr_consent%3D{{.GDPRConsent}}%26uid%3D")