This study examines how the risk of labour standards noncompliance can be rendered calculable and commensurable through a market device. We present a case study of the Cleaning Accountability Framework (CAF), an industry certification scheme, which seeks to address labour exploitation in the Australian contract cleaning industry. We pay particular attention to the central device of the certification scheme – the pricing schedule. We examine how the pricing schedule shaped the calculative space informing contracting parties during the procurement process. In doing so, the pricing schedule increased transparency around the potential risk of labour standards noncompliance. The nature of this transparency and the perceived objectivity of the pricing schedule acted to reshape the market for contract cleaning, resulting in a redistribution of accountability for labour exploitation. We also examine how the pricing schedule formed part of a wider framework of accountability, and how these mechanisms enabled strategic co-enforcement of labour standards compliance by supply chain stakeholders. Overall, our study indicates the potential for accounting practices to play a more active role in shaping how markets address modern slavery risks.