s2.dev
ActiveAPI for unlimited, durable, real-time streams
What it does
S2 is an API for durable streams. We make working with streaming data dead simple and reliable. The more we worked on data systems, the more we felt like there was a missing building block. The seamless experience of object storage simply did not exist for durable streams – so we set out to fix that! S2 reimagines streams as an unlimited and access-controlled web resource. Like if Kafka and S3 had a baby. - Building agents? Use granular streams to persist context in real time, make workflows auditable, and coordinate between agents. - Publishing fast-moving data? Streams support high fanout and can be accessed directly over the internet, so they are a great fit for broadcasting real-time feeds. - Sandboxing? Emit to per-instance streams, and read history or live events just as easily. - Local-first and multiplayer experiences? Propagate updates reliably and efficiently. Stop dealing with clusters, and start streaming.
Its site says now · captured 2026-08-23
S2, the durable stream API
S2 is the serverless API for unlimited, durable, real-time streams, built for event streaming, AI agents, realtime apps, and stream processing.
Next to it in Agent infrastructure · Durable streams infrastructure for agents
- AmikaY Combinator F25
Infra to build your own software factory
- AgentMailY Combinator S25
Email Inboxes for AI Agents
- MonteY Combinator S25
Continual Learning for Agents
- InsForgeY Combinator X26
The agent-native AWS
- Keyframe LabsY Combinator X26
Bring AI to life with the world's best interactive avatars
- GitCafeY Combinator S26
The Git forge for the next hundred billion commits
- MireyeY Combinator S26
Infrastructure for Physical World AI Agents
- HexclaveY Combinator S24
The user infrastructure platform