Online commerce has significantly expanded the circulation of various commodities, including kratom, whose legal status in Indonesia remains controversial. At present, kratom is regulated solely for export purposes and lacks a clear legal basis for domestic trade, creating legal uncertainty in online sale transactions. This study examines the validity of kratom powder sale agreements conducted through e-commerce platforms under Article 1320 of the Indonesian Civil Code and analyzes the legal responsibility of platform providers for facilitating such transactions. The research employs a doctrinal legal method using statutory and conceptual approaches, complemented by an empirical review of kratom listings on major Indonesian e-commerce platforms. The findings indicate that online kratom transactions potentially fail to satisfy the objective requirements of a valid contract, particularly regarding lawful object and lawful cause, due to the absence of explicit domestic regulatory authorization. Empirical observations further reveal inadequate age-verification mechanisms, raising concerns over transactions involving legally incapacitated consumers. This study underscores the urgent need for comprehensive national regulation on kratom and strengthened legal obligations for e-commerce platforms to ensure consumer protection and contractual legality in digital markets.Keywords: contract; validity; kratom; e-commerce platforms; platform liability
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