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

Toss, South Korea’s mobile financial platform, is partnering with Poseidon, a blockchain-based decentralized artificial intelligence data infrastructure company, to enter the user-participation AI data business. It is Toss’s first partnership in the Web3 and AI data sectors.

Under the partnership, Poseidon’s data contribution app NUMO will launch as a Toss mini app, the companies said on June 26. The model will allow Toss’s 30 million users to provide AI training data such as voice, images and video from daily life with their consent, 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 technology. The companies aim to gain an early lead in high-quality everyday data, where demand from global AI research labs is rising, by tapping South Korea’s extensive mobile infrastructure.

Poseidon will provide infrastructure that tracks data provenance and contribution value without tampering through its proprietary blockchain technology. Toss, which recently declared the start of the “Currency 3.0” era, will handle transparent settlement on that basis. The company said it will also consider phased links with next-generation Web3 infrastructure such as crypto wallets, stablecoins and payment networks.

“The growth of the AI industry is rapidly increasing demand for high-quality data,” said Seo Chang-hoon, Toss’s executive director for new business. He added that the company will expand a structure that allows users to participate in the data economy easily and naturally, while being compensated transparently for the value they contribute.

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

Poseidon supplies high-quality real-world data with transparent copyright status to global frontier AI companies. Last year, it raised a $15 million seed round from Andreessen Horowitz, the Silicon Valley venture capital firm known as a16z.

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