# S2 Dev

**Canonical:** https://apis.io/providers/s2-dev/  
**Website:** https://s2.dev/docs  
**APIs profiled:** 6

S2 ("Stream Store") is the API for unlimited, durable, real-time streams. Where object storage deals with blobs, S2 provides append-able, ordered record streams that can be tailed in real time and replayed from any retained point. Core data-plane operations are append, read, and check-tail; the control plane manages accounts, basins (stream namespaces), streams, scoped access tokens, locations, and metrics. It targets agent session logs, live views and build logs, event sourcing and sync, data feeds, resumable LLM token streaming, and observability. Access is over a REST/JSON + Protobuf HTTP API, an S2S binary protocol over HTTP/2, SSE tailing, first-party TypeScript, Python, Go, and Rust SDKs, a CLI, and a Terraform provider. S2 is a Y Combinator-backed company.

## Kin Score — 61.9 / 100 (strong)

Scored 2026-08-17 under rubric 0.11.0. Trend: flat (+0.0 from 61.9).

| Facet | Score |
|---|---|
| Discoverability | 92.6 |
| Contract Quality | 55.2 |
| Governance | 11.5 |
| Operational Transparency | 78.9 |
| Developer Ergonomics | 75.5 |
| Commercial Clarity | 60.5 |

## Agent readiness — 52.0 (agent-native)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| MCP Server | derived |
| Auth Clarity | yes |
| Idempotency | documented |
| Error Semantics | verified |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | yes |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (6)

- **S2 Dev access-tokens API** — Manage access tokens
- **S2 Dev basins API** — Manage basins
- **S2 Dev locations API** — Manage locations
- **S2 Dev metrics API** — Usage metrics and data.
- **S2 Dev records API** — Manage records
- **S2 Dev streams API** — Manage streams

## MCP servers (1)

- **s2-dev-mcp.yml**

## Agentic access (1)

- **S2 Dev Agentic Access** — 24 operations · 12 acting · 1 human-in-the-loop

## Security (4)

- **S2 Dev Authentication** — http · 1 scheme
- **S2 Dev Domain Security** — TLSv1.3 · DMARC
- **S2 Dev Vulnerability Disclosure** — security.txt · contact published
- **S2 Dev Trust Center** — SOC 2, HIPAA, GDPR

## Tags

Company, Streaming, Real-Time, Event Streaming, Durable Storage, Message Streaming, Data Feeds, Observability, Developer Tools, Infrastructure

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/s2-dev/). Scores are computed from the provider's own public artifacts under a published rubric.