# Nisshi

**Canonical:** https://apis.io/providers/nisshi/  
**Website:** https://nisshi.io  
**APIs profiled:** 0

Nisshi (formerly Tansu) is an open-source (Apache-2.0), Rust-built, Apache Kafka compatible message broker that stores data in S3, PostgreSQL, SQLite/libSQL or memory and can write schema-validated topics (JSON Schema, Avro, Protocol Buffers) as Apache Iceberg or Delta Lake tables. Its surface is the Kafka wire protocol rather than an HTTP API, and no OpenAPI, AsyncAPI or GraphQL contract is published. The project has been renamed Nisshi (README: 'Nisshi (nee Tansu)'); github.com/tansu-io/tansu redirects to github.com/nisshi-io/nisshi and tansu.io no longer resolves in DNS.

## Kin Score — 4.9 / 100 (minimal)

Scored 2026-11-06 under rubric 0.27.0. Trend: flat (-1.3 from 6.2).

| Facet | Score |
|---|---|
| Discoverability | 44.6 |
| Contract Quality | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 11.9 |
| Access Clarity | 0.0 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 0.0 (matched via fallback).

## Agent readiness — 0.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |
| MCP Tool Quality | na |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## Tags

Company, Kafka, Message Broker, Streaming, Open Source, Apache Iceberg, Delta Lake, Rust

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