# Smithsonian Institution

**Canonical:** https://apis.io/providers/smithsonian/  
**Website:** https://www.si.edu  
**APIs profiled:** 3

Smithsonian Institution Open Access REST API providing search and retrieval of over 4.7 million digitized objects, images, 3D models, and metadata across 19 museums and research centers. All content is released under CC0 (public domain) and covers art and design, history and culture, and science and technology collections.

## Kin Score — 41.6 / 100 (developing)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 41.6).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 62.1 |
| Governance | 9.8 |
| Contract Governance | 9.8 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 50.0 |
| Access Clarity | 50.0 |

## Agent readiness — 32.5 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | na |
| Error Semantics | verified |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Paid · Self-serve signup — onboarding: self-serve, pricing: paid, trial: no (confidence: high).

## APIs (3)

- **Smithsonian Institution content API** — Retrieve individual collection objects by ID or URL
- **Smithsonian Institution metrics API** — Statistics about CC0 objects and media
- **Smithsonian Institution search API** — Search across Smithsonian collections

## Agentic access (1)

- **Smithsonian Agentic Access** — 5 operations

## Security (2)

- **Smithsonian Authentication** — apiKey · 1 scheme
- **Smithsonian Domain Security** — TLSv1.3 · DNSSEC · DMARC

## Plans (1)

- **Smithsonian Plans Pricing**

## Tags

Museums, Open Access, Cultural Heritage, Collection, Image, 3D Models, Public Domain, CC0

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