Poseidon
Long-Tail Training Data for AI
- Headquarters
- Palo Alto, California
- Employees
- 1–10
- Founded
- 2025
- Business Model
- B2B
- Website
- psdn.ai
- Last Round
- SeedJul 2025
- Rounds
- 1
About
Poseidon is a full-stack data infrastructure layer designed to solve AI's long-tail data bottleneck by bridging supply and demand for high-quality, rights-cleared training data. Incubated by Story Protocol, Poseidon enables crowdsourced collection of differentiated long-tail data and edge cases, curation and cleaning with quality flagging, and AI-assisted human annotation for fine-grained labels. The platform allows data contributors to earn rewards while giving AI developers access to licensed datasets with clear provenance. Poseidon currently hosts over 2.5 million audio files across 8+ languages representing 16,500+ hours of audio data.
Tech & App Stack
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Jul 2025
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