I am just playing around a bit, but wrote a "Martingale" bot for PeerBet. I use quotes because given nature of PeerBet it is a little hard to keep in the form of true Martingale (but given how poor that strategy can be, maybe that is a good thing).
I haven't finalized it, but the source is available here ->
https://github.com/dwmcqueen/pbmartingaleIt currently works (in that it runs and places bets). Any developers out there that want to improve it - feel free. Note that it also has a simple wrap-around API for PeerBet that may be helpful to anyone else doing development.
If helpful, I welcome any donations to 1FcznMjGBFxD9YvcFfMCVbhkkKYSACCNcP