Using axiomatic analysis, this paper examines the relationship between open data and transparency in corruption prevention in Indonesia. Opentender represents a modality of e-government and open government in mitigating Public Procurement corruption. The results presented in this research were derived from document analyses and interviews with the Indonesian Corruption Watch (ICW), the initiator and administrator of Opentender. The results of this study demonstrate that Opentender, as an element of open government does promote transparency and hence address the failure of information asymmetry. Furthermore, it demonstrates a preventive capability by displaying data with potential fraud indicators, thereby enhancing information accessibility. Nonetheless, Opentender has yet to affect aspect of capacity building and empowerment. This is evidenced by the inadequate exploitation of data on Opentender as only a few stakeholders or public members use data on Opentender or utilizing Opentender as a mechanism for overseeing Electronic Public Procurement. Theoretically, this study advances the use of axiomatic analysis in understanding corruption prevention. The integration of Opentender to the existing anti-corruption institutional frameworks in Indonesia will further boost the impact of Opentender to corruption prevention in Indonesia.
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