Space Frontiers
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.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Space Frontiers the way a machine reads it — 38 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Space Frontiers scores 63.5/100 (strong), with a separate agent-readiness read of 69/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-10-31 · rubric v0.25.0
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How we profile Space Frontiers
Each block below is one kind of artifact we hold for Space Frontiers. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 9
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
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.
Scroll within the panel for all 9 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
Space Frontiers MCP Server
Remote MCP server at mcp.machinelibrary.ai over streamable HTTP requiring OAuth; 9 tools listed.
MCP SERVERAgent Skills 6
An agent skill packages the how-to for driving these APIs from an assistant — the prompts, the sequence, the guardrails — so the knowledge to use the API travels with it.
Packaged agent skills for driving this provider's APIs from an AI assistant.
machinelibrary-ai-agent-top-up
AGENT SKILLmachinelibrary-ai-auth
AGENT SKILLmachinelibrary-ai-conversation-turn
AGENT SKILLmachinelibrary-ai-grounded-research
AGENT SKILLmachinelibrary-ai-install
AGENT SKILLmachinelibrary-ai-recognize-document
AGENT SKILLPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Machinelibrary Ai Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Machinelibrary Ai Finops
FINOPSSemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Machinelibrary Ai Context
JSON-LDSpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Space Frontiers API Rules
SPECTRALJSON Schema 12
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
AgentCommentSubmission
JSON SCHEMAByUriResponse
JSON SCHEMAConversationRequest
JSON SCHEMAConversationResponse
JSON SCHEMAFeedbackAccepted
JSON SCHEMARecognitionJobStatus
JSON SCHEMARecognitionSubmission
JSON SCHEMASearchFeedback
JSON SCHEMASearchRequestV2
JSON SCHEMASimilarRequestV2
JSON SCHEMAV2DocumentResponse
JSON SCHEMAV2SearchResponse
JSON SCHEMAScroll within the panel for all 12 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Space Frontiers — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 3
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 9
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 9 ·
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 5
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 9
Properties that don't map to a standard resource type
Scroll within the panel for all 9 ·
← All providers · Data indexed from github.com/api-evangelist/machinelibrary-ai · machine-readable index on apis.io
This is an independent, third-party profile of Space Frontiers, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.