# Space Frontiers

**Canonical:** https://apis.io/providers/machinelibrary-ai/  
**Website:** https://machinelibrary.ai/  
**APIs profiled:** 4

Space Frontiers is a Wyoming corporation whose search and AI product, Machine Library (formerly Space Frontiers search, moved to machinelibrary.ai on 2026-09-12), is a full-text retrieval API and hosted MCP server over a corpus the provider describes as multi-billion documents: peer-reviewed papers (CrossRef, PubMed, arXiv), books, USPTO patents, Wikipedia, technical standards, YouTube transcripts, and live Reddit, Telegram and Discord posts. It is built for AI agents doing literature review, fact-checking, citation walking and grounded research synthesis, returning compact reranked hits with canonical source URIs (DOI, arXiv, PMID, ISBN) and token-bounded full text. Three surfaces share one account and API key: a REST API at api.machinelibrary.ai (OpenAPI 3.1, pay-as-you-go), a Streamable-HTTP MCP server at mcp.machinelibrary.ai (OAuth 2.1 with PKCE and RFC 7591 dynamic registration against the issuer api.machinelibrary.ai, scope search, or a Bearer API key), and an A2A agent at machinelibrary.ai/a2a. It also ships a PDF/EPUB/DJVU-to-Markdown recognition API and Stripe-settled prepaid credit packages for agents (ACP checkout, MPP top-up). The company also publishes Hermes, an open-source Rust search engine with a gRPC contract and Python/TypeScript clients.

## Kin Score — 65.5 / 100 (strong)

Scored 2026-10-09 under rubric 0.23.0. Trend: flat (+4.7 from 60.8).

| Facet | Score |
|---|---|
| Discoverability | 82.5 |
| Contract Quality | 63.4 |
| Contract Governance | 35.6 |
| Operational Transparency | 73.2 |
| Developer Ergonomics | 59.5 |
| Access Clarity | 65.8 |

Regulatory layer — **Education & Research**: 40.2 (matched via tags).

## Agent readiness — 65.7 (agent-ready)

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

## APIs (9)

- **Machine Library MCP Server** — Hosted Streamable-HTTP MCP server at https://mcp.machinelibrary.ai (legacy https://mcp.spacefrontiers.org still served) exposing nine machinelibrary_* tools: four read-only, ide...
- **Machine Library A2A Agent** — A2A (protocolVersion 0.3.0) research and commerce agent at https://machinelibrary.ai/a2a over JSON-RPC: grounded research answers with citation artifacts, search-access guidance...
- **Hermes Search Engine gRPC API** — Self-hosted, MIT-licensed Rust search engine published by Space Frontiers (github.com/SpaceFrontiers/hermes) with a published protobuf wire contract: hermes.SearchService (Searc...
- **Space Frontiers Documents API** — Fetch documents by ID or canonical URI.
- **Space Frontiers Payments API** — The Payments API from Space Frontiers — 1 operation(s) for payments.
- **Space Frontiers Raw document downloads API** — Authenticated, feature-gated streaming of PDF, EPUB, and DJVU library originals.
- **Space Frontiers Recognition API** — Document recognition: PDF, EPUB, and DJVU to structured Markdown with quality reports.
- **Space Frontiers Search API** — Ranked retrieval and document similarity.
- **Space Frontiers Conversations API** — Retrieval-augmented conversation workflows.

## MCP servers (1)

- **Space Frontiers MCP Server** — Remote MCP server at mcp.machinelibrary.ai over streamable HTTP requiring OAuth; 9 tools listed.

## Agentic access (1)

- **Machinelibrary Ai Agentic Access** — 42 operations · 18 acting

## Security (3)

- **Machinelibrary Ai Authentication** — apiKey/http/oauth2 · 3 schemes
- **Machinelibrary Ai Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **Machinelibrary Ai Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Machinelibrary Ai Plans Pricing**

## Tags

Research, Scholarly Search, Full-Text Search, Retrieval, RAG, Patents, Documents, OCR, Document Recognition, MCP, A2A, Agent-Native, AI Agents, Data, Search

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