This chapter introduces a particularly ragged edge of debt involving companies seeking to exploit sets of social and technical relations that often, on the face of it, appear to bear quite little connection to finance. I call this assortment of socio-economic practices ‘digital subprime’. In introducing this phenomenon, I hope to provide a window into how a small but expanding set of startup businesses, in competition with both each other and the wider credit market, are attempting to refashion monetary ontologies, and in particular the relationship between money and credit.