Poseidon Partners With 30 Million-User Toss to Launch AI Data Business

Toss, South Korea’s mobile finance platform, is partnering with blockchain-based decentralized AI data infrastructure company Poseidon to enter the user-participation AI data business. The agreement marks Toss’s first partnership in the Web3 and AI data sectors.

The two companies said on June 26 that Poseidon’s data contribution app, NUMO, will be launched as a Toss mini app. Under the model, Toss’s 30 million users can, with consent, provide AI training data from daily life, including voice, images and video, and receive transparent compensation based on their contribution.

The main target is first-person real-world behavioral data, which is essential for training physical AI systems such as robots and autonomous driving technologies. The companies aim to gain an early lead in high-quality real-life data, where demand from global AI labs is surging, by leveraging South Korea’s broad mobile infrastructure.

Poseidon will provide infrastructure based on its proprietary blockchain technology to track data provenance and contribution value without tampering. Toss, which recently declared the advent of the “Currency 3.0” era, will oversee transparent settlement based on that system. The companies also plan to gradually explore links with next-generation Web3 infrastructure, including crypto wallets, stablecoins and payment networks.

“Demand for high-quality data is rising quickly as the AI industry grows,” said Seo Chang-hoon, an executive director in charge of new businesses at Toss. He added that the company will expand a structure that allows users to participate easily and naturally in the data economy and be compensated transparently for the value they contribute.

South Korea is an ideal market, combining the strategic importance of AI data, mature digital financial infrastructure and a world-class mobile user experience, according to Lee Seung-yoon, Poseidon’s chief strategy officer and chairman of the board. After validating a user-participation model in Korea, the company aims to establish it as a scalable global standard, he added.

Poseidon supplies high-quality real-world data with transparent copyright provenance to global frontier AI companies. Last year, it raised a $15 million seed round from Andreessen Horowitz, or a16z.

Lee, who is leading Poseidon’s new business initiative, is a serial entrepreneur who founded web novel platform Radish and sold it to Kakao Entertainment. He is also a co-founder of Story, an IP blockchain project recently renamed the DATA Foundation, and was named a 2026 Young Global Leader by the World Economic Forum this year.