Query research and reference data
Find interfaces for scholarly metadata, reference sources and public knowledge.
Services are ordered by documented operations, attributed reports and current documentation. 39 interfaces are classified here. Each card shows the interfaces a service offers; open it for access requirements and sources.
Categories · Tasks · Interfaces · How listings are checked
SuprSend
SuprSend provides an HTTP API for retrieving metadata about a subscriber list in a workspace.
notifications · Communications · API
API · Access documentation verifiedNumonic
Numonic provides an MCP server for searching and managing a private library of AI-generated creative assets.
creative-assets · search · mcp · Developer tools
MCP · Access documentation verifiedHelius
Helius provides Solana RPC and digital asset standard APIs, including getAsset to retrieve detailed NFT, compressed NFT, or token information.
blockchain · Developer tools · Public data
API · Access documentation verifiedAcoustID
AcoustID provides an audio fingerprint web service that looks up associated MusicBrainz metadata for unknown audio.
music-data · audio-fingerprinting · api
API · Access documentation verifiedBox
Cloud content management platform with a REST API, a CLI and a hosted MCP server for AI agents.
Content management · Productivity and collaboration · Developer tools
API · Access documentation verifiedCLI · Access documentation verifiedMCP · Access documentation verifiedScrapingBee
Web scraping API with JavaScript rendering, proxy rotation and data extraction, plus a CLI and a remote MCP server.
Developer tools · Research and knowledge
API · Access documentation verifiedMCP · Access documentation verifiedCLI · Access documentation verifiedFilestack
Filestack File API returns JSON metadata for an uploaded file handle, including its file type, size, and storage details.
file management · Developer tools · storage
API · Access documentation verifiedFreesound
With the Freesound API you can browse, search, and retrieve information about Freesound users, packs, and the sounds themselves of course.
audio · Media and entertainment
API · Access documentation verifiedSourcegraph
Sourcegraph provides an HTTP streaming search API that returns code-search results and related metadata as events. Its current documentation includes a concrete unauthenticated Sourcegraph.com request and an optional access-token request.
Developer tools · code-search · api
API · Access documentation verifiedCrossref
The REST API provides access to scholarly metadata and supports the open access metadata community.
Research and knowledge
API · Documentation checked: 2026-10-07API · Documentation checked: 2026-10-07API · Documentation checked: 2026-10-07API · Access documentation verifiedAMNT
AMNT provides an authenticated API for searching public metadata about live AI agents; listing never spends a credit.
ai-agents · agent-discovery · marketplace · api
API · Access documentation verifiedAmanah Sunnah
A free REST API providing semantic search and direct access to 67,458+ verified Islamic references.
data-api · religion · reference
API · Access documentation verifiedCleveland Museum of Art
The Cleveland Museum of Art provides an open-access API for searching collection artworks and their metadata and image links.
art · museum-collection · open-data · api
API · Documentation checked: 2026-10-10DataStream
DataStream is a Canadian freshwater data platform whose read-only public API provides metadata, locations, and observations for publicly available water-quality datasets.
water quality · environmental data · Public data
API · Documentation checked: 2026-10-10Microlink
Microlink extracts normalized website metadata from a URL through a REST endpoint.
web-data · Developer tools · content-extraction
API · Documentation checked: 2026-10-09Open-Meteo
Free weather forecast and historical weather API — 30+ models, historical weather from 1940.
Weather and climate
API · Documentation checked: 2026-10-12API · Documentation checked: 2026-10-07API · Documentation checked: 2026-10-07API · Documentation checked: 2026-10-07API · Access documentation verifiedWikipedia
The MediaWiki REST API provides wiki content through a RESTful HTTP interface, including Wikipedia page search and retrieval.
Research and knowledge
API · Documentation checked: 2026-10-13Liner
Liner provides a remote search MCP server for web, scholarly, legal, finance, medical and business research tools.
web search · Research and knowledge · Model Context Protocol
MCP · Documentation checked: 2026-10-10pCloud
pCloud provides cloud storage with an HTTP JSON API. The documented listfolder method returns folder metadata and its contents.
cloud-storage · api · file-management
API · Documentation checked: 2026-10-11Artifact Share
Artifact Share stores AI-created HTML, Markdown, folders and static sites behind stable share URLs, with a remote MCP interface for reading and managing the user's artifacts.
Productivity and collaboration · file-sharing · Developer tools
MCP · Documentation checked: 2026-10-11Desearch
Hosted web and social search API that returns search-grounded structured results from selected sources for agent, research and retrieval workflows.
API · search
API · Documentation checked: 2026-10-11Dimensions
Dimensions connects research publications with grants, patents and clinical trials, with an authenticated Search Language interface for licensed research analytics.
research-data · academic-publications · bibliometrics
API · Documentation checked: 2026-10-10Roboflow
Roboflow provides computer-vision tooling and a management API for listing non-secret API-key metadata in a workspace.
Computer Vision · Developer tools · API
API · Documentation checked: 2026-10-11Capella Space
Capella provides Earth intelligence from its synthetic-aperture radar satellite constellation.
earth observation · geospatial data · API
API · Documentation checked: 2026-10-10