UBERやグラブタクシーはバイクタクシーサービスを停止していますが、Gobikeは合法的にバイクタクシーを呼べます。バンコク・ポストで紹介されていました。使ってみてください！
GoBike
Android : https://play.google.com/store/apps/details?id=com.gobike
iOS : https://itunes.apple.com/us/app/gobike-book-a-motorcycle-taxi/
New legal motorcycle app launched in Bangkok
A new Thai-created mobile software application for motorcycle taxi and parcel delivery services has been launched in Bangkok under agreement with a motorcycle taxi association to eradicate legal problems...
http://www.bangkokpost.com/news/general/1045909/new-legal-motorcycle-app-launched-in-bangkok