#science

Atomic isotope reference data as an API, built on the NIST Atomic Weights and Isotopic Compositions. For every known nuclide: its element (atomic number Z and symbol), mass number, relative atomic mass, natural isotopic composition (abundance) and the element's standard atomic weight. Look an isotope up by label (C-12, U-238) or by symbol + mass, list every isotope of an element, rank isotopes by mass or natural abundance, or search. A precise physics and chemistry reference for science, education, lab and engineering apps. Distinct from element-level data.

api.oanor.com/isotopes-api

NASA's catalogue of 45,000+ meteorites recovered on Earth as an API. For each meteorite: its name, NASA id, classification (recclass, e.g. L5, Iron), mass in grams, whether it was seen to fall or simply found, the year, and the latitude/longitude where it was recovered. Look one up by name or id, find the meteorites NEAR any coordinate (great-circle distance), rank by mass or year, list a classification or year, or search. Great for space, education, mapping and museum apps. Distinct from asteroids and close-approach data — these are rocks already on the ground.

api.oanor.com/meteorites-api

The 88 modern IAU constellations as an API — the reference an astronomy app, planetarium or education tool needs. For each constellation: its official IAU abbreviation, English name, the Latin genitive used when naming stars (e.g. "Alpha Andromedae"), a size rank, the approximate centre in equatorial coordinates (right ascension / declination) and the constellation name in roughly 25 languages. Look one up by abbreviation or name, search across every language, find which constellation a sky position falls nearest to, or list them all. Distinct from stars-api (individual stars) — this is the reference for the constellations themselves. Served from memory — always fast.

api.oanor.com/constellations-api

The IAU Minor Planet Center list of observatory codes as an API — every site the MPC uses to identify a telescope when it publishes astrometric observations of asteroids and comets. For each of 2,700+ codes: the 3-character code, the observatory name, its east longitude and the parallax constants (rho·cos φ', rho·sin φ'). From those constants the API derives each site's geocentric latitude and a -180..180 longitude, so you can find the observatories nearest any point on Earth with a great-circle (haversine) search. Look one up by code, search by name, list them all, or find the closest sites to a latitude/longitude. Distinct from telescope-api (optics maths) — this is the registry of real observing sites and where they are. Served from memory — always fast.

api.oanor.com/observatories-api

iNaturalist as an API — the world's largest citizen-science nature platform, returned as clean JSON, no key. Search hundreds of millions of wildlife observations by species name, place or quality grade and get each one with its photos, identified species, location, date and observer. Open a single observation, search taxa (species) and open a taxon for its common name, rank, full ancestry, photos, Wikipedia link, conservation status and observation count. Discover the most-observed species in any place (by place id or latitude/longitude), autocomplete places, and rank the top observers. Live data straight from iNaturalist. Distinct from taxonomic registries: this is real community observations with photos and locations — ideal for nature, birding and species-identification apps, biodiversity dashboards and education. 7 data endpoints. Authenticated with an x-oanor-key; fair-use rate limits per plan.

api.oanor.com/inaturalist-api

Classical-mechanics maths as an API. The kinematics endpoint is a full SUVAT solver: give any three of initial velocity (u), final velocity (v), acceleration (a), time (t) and displacement (s) and it computes the rest using the standard constant-acceleration equations. The projectile endpoint takes a launch speed and angle (and an optional launch height and gravity) and returns the horizontal and vertical velocity components, the time to the peak, the maximum height, the total flight time, the range and the impact speed. The free-fall endpoint computes a vacuum fall from a height or for a time, with an optional initial velocity, returning the fall time, distance and impact velocity. Gravity defaults to standard 9.80665 m/s² but can be set for the Moon, Mars or any body. Everything is computed locally and deterministically in SI units, so it is instant and private. Ideal for physics education and homework, engineering and simulation, game and ballistics development, and motion tools. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is motion physics; for planetary data use a planets API and for unit conversion use a unit API.

api.oanor.com/physics-api

Protein-protein interaction networks as an API — powered by STRING, the database of known and predicted protein associations that combines evidence from laboratory experiments, curated pathway databases, gene co-expression, genomic context and automated text mining into a single confidence score, across thousands of organisms. Get a protein's top interaction partners (each with the combined confidence score and the seven evidence-channel subscores), the interaction network among any set of proteins as scored edges, and functional enrichment for a gene set — the over-represented GO terms, KEGG pathways, Pfam domains and more, each with its p-value, FDR and member genes. Pass gene symbols (TP53) or STRING/Ensembl ids, for human (default) or any species by NCBI taxon id. It is a cornerstone of systems biology — ideal for network analysis, functional genomics, pathway and bioinformatics tools. A protein-interaction-network resource — distinct from biological pathways (Reactome), curated protein complexes (Complex Portal) and Gene Ontology annotations (QuickGO). Open data from STRING (CC BY 4.0).

api.oanor.com/stringdb-api

Polygenic (risk) scores as an API — powered by the NHGRI-EBI PGS Catalog, the open database of published polygenic scores: weighted combinations of genetic variants used to estimate a person's genetic predisposition to a trait or disease. Search traits by name to find their ontology ids, list every polygenic score developed for a trait, and read a score's full metadata — the reported and mapped (EFO/MONDO) traits, the number of variants in the score, the development method, genome build, the ancestry distribution of the samples it was built and evaluated on, the publication behind it (title, journal, date, PubMed id), the release date, license and a direct link to the scoring file. From breast cancer and coronary artery disease to type 2 diabetes and BMI, it is ideal for statistical genetics, genomics, risk-prediction research and bioinformatics tools. A polygenic-score / genetic-risk-prediction resource — distinct from single-variant association studies (GWAS Catalog), population allele frequencies (gnomAD) and clinical variant interpretation (ClinVar). Open data from the NHGRI-EBI PGS Catalog (CC BY 4.0).

api.oanor.com/pgs-api

Gene function as an API — powered by EMBL-EBI's QuickGO and the Gene Ontology (GO), the standard vocabulary that describes what gene products do across three aspects: molecular function, biological process and cellular component. Given a gene or protein (a UniProt accession), list every GO annotation made for it — the GO term, its aspect, the qualifier, the evidence code, the supporting reference (e.g. a PubMed id), the organism and who assigned it — optionally filtered by aspect or organism. Look up any GO term to get its definition, aspect, synonyms and number of child terms; and search the ontology by name to find the right GO terms. GO term names are resolved automatically on annotations. From TP53 to any protein in any species, it is the backbone of functional genomics — ideal for enrichment analysis, annotation pipelines, bioinformatics and research tools. A gene-function annotation resource (which genes have which functions, with evidence) — distinct from generic ontology-term lookup. Open data from EMBL-EBI QuickGO and the GO Consortium (CC BY 4.0).

api.oanor.com/quickgo-api

Scholarly citations as open data — powered by OpenCitations (COCI), the open citation index. Unlike a metadata lookup, OpenCitations treats every citation as a first-class object: given a DOI you can list the papers that cite it (incoming citations) and the papers it references (outgoing), each annotated with its OpenCitations Identifier (OCI), the date the citation was created, the timespan between the two works, and whether it is a journal- or author-self-citation. Plus quick citation and reference counts for any DOI. It is built for citation-network and bibliometric work — research-impact analysis, self-citation detection, citation-timespan studies and science mapping — and is distinct from scholarly-metadata services (Crossref, OpenAlex). From a single paper to a whole reference graph, ideal for bibliometrics, research-analytics and reference-management tools. Open data from OpenCitations (CC0).

api.oanor.com/opencitations-api

The tree of life as an API — powered by the Open Tree of Life, the project that unifies published phylogenetic trees and taxonomies into a single synthetic tree spanning about 2.3 million named species. Resolve any scientific name to its canonical taxon and Open Tree Taxonomy (OTT) id (cross-referenced to NCBI, GBIF and other sources); read a taxon's classification and full lineage of ancestors up the tree (genus, family, order, class, …); and compute the most recent common ancestor (MRCA) of any set of species — the heart of comparative biology and "how related are these organisms?" questions. From Homo sapiens and the great apes to any branch of plants, fungi, animals and microbes, it is ideal for biology, evolution, ecology, education and bioinformatics tools. An evolutionary-tree / phylogenetics reference — distinct from species-occurrence data (biodiversity / GBIF), marine taxonomy (WoRMS) and sequence databases. Open data from the Open Tree of Life project (CC0).

api.oanor.com/opentol-api

Human genetic trait associations as an API — powered by the NHGRI-EBI GWAS Catalog, the curated reference of published genome-wide association studies. It answers the core question of statistical genetics: which genetic variants (SNPs) are associated with which traits and diseases, and how strongly. Look up a SNP to get its functional class, genomic location and mapped genes; pull every trait association reported for it — the trait, p-value, effect size (odds ratio or beta), risk allele and frequency, and author-reported genes; and read the study behind the evidence — trait, sample sizes, ancestries, genotyping technology and the publication (PubMed id, authors, journal, date). From type 2 diabetes and Crohn disease to systemic lupus erythematosus and hundreds of thousands of associations, it is ideal for genomics, bioinformatics, statistical-genetics and biomedical research tools. A published genetic-association evidence base — distinct from population allele frequencies (gnomAD), clinical variant interpretation (ClinVar) and genome annotation (Ensembl). Open data from the NHGRI-EBI GWAS Catalog (EMBL-EBI).

api.oanor.com/gwas-api

Crystal structures as an API — powered by the Crystallography Open Database (COD), the open, public-domain collection of over 500,000 crystal structures of organic, inorganic, metal-organic compounds and minerals. Search the database by chemical formula (any standard casing — TiO2, Al2O3, H2O — is normalised automatically) or by free text over mineral names, titles and comments, then look up any structure to get its full crystallographic data: chemical and cell formula, space group (Hermann-Mauguin and Hall), the complete unit cell (a, b, c, alpha, beta, gamma and volume), the source publication (title, authors, journal, year, DOI) and a link to the CIF file. From quartz, calcite and diamond to anatase, corundum and diopside, it is ideal for materials science, solid-state chemistry, mineralogy, crystallography teaching and research tooling. This is a crystal-structure & materials database — distinct from molecule-property (chemistry / PubChem) and protein-structure (PDB) databases. Open data from the Crystallography Open Database (CC0 / public domain).

api.oanor.com/cod-api

ORCID as an API — the global researcher identity registry, powered by the ORCID Public API. An ORCID iD (for example 0000-0002-1825-0097) uniquely and persistently identifies a researcher across journals, funders, universities and the entire scholarly record. Search more than 15 million researchers by name, institution, keyword or external identifier using rich Solr field syntax, getting each match's ORCID iD, name, other names and affiliated institutions; read a researcher's public profile including their published and credit names, biography, research keywords, country, personal and lab websites and external identifiers such as Scopus Author ID or ResearcherID; list the works they have claimed on their record with each work's title, type, publication year, journal and DOI; and trace their employment and education affiliations with the organization, role, department and dates. Ideal for research-information systems, author disambiguation, institutional reporting, scholarly tooling and academic search. ORCID iDs come from search results or are supplied directly by the researcher. Data is the public portion of ORCID records (CC0). For the scholarly works and citation graph see the OpenAlex API; for DOIs and journal metadata the Crossref API.

api.oanor.com/orcid-api

Search the entire arXiv scholarly-preprint corpus as an API — millions of papers across physics, mathematics, computer science, quantitative biology and finance, statistics, electrical engineering and economics. Query by free text, title, author and/or subject category (e.g. q=transformer&category=cs.AI), with paging and sort by relevance, submission or last-update date, or pull full metadata for any paper by its arXiv id (e.g. 1706.03762 → "Attention Is All You Need"). Every result carries the title, full author list, abstract, primary and cross-list categories, DOI, journal reference, comments and a direct PDF link. Ideal for literature-review and research tools, citation managers, ML/AI paper trackers, academic search and discovery, and science newsletters.

api.oanor.com/arxiv-api

Chemical compound data as an API, powered by NIH PubChem (>100 million compounds). Look up any compound by common name, PubChem CID or SMILES and get its molecular formula, molecular and exact mass, IUPAC name, canonical SMILES, InChI and InChIKey, plus physicochemical properties (XLogP, TPSA, formal charge, hydrogen-bond donor/acceptor counts, rotatable bonds, heavy-atom count). List a compound's synonyms and trade/registry names, or resolve a name to PubChem CIDs. Ideal for cheminformatics, lab software, education, drug-discovery tooling and scientific data pipelines.

api.oanor.com/chemistry-api

The NIST CODATA 2022 fundamental physical constants as an API — 355 quantities used throughout physics and engineering. Look up any constant by name or slug (e.g. speed of light in vacuum → 299792458 m/s, exact; Planck constant, elementary charge, Avogadro constant, Boltzmann constant, Newtonian constant of gravitation), search by keyword, or list them all. Each record carries the recommended value, the standard uncertainty, the SI unit and whether the value is exact (by definition since the 2019 SI redefinition). Ideal for scientific calculators, physics/engineering software, education and lab tooling.

api.oanor.com/constants-api

Explore 6,200+ confirmed planets orbiting other stars, from the NASA Exoplanet Archive. For each exoplanet get its host star, discovery method, year and facility, orbital period, radius and mass (relative to Earth), distance in light-years and equilibrium temperature. Look one up by name, search and filter by discovery method or year, or list every planet in a host system (e.g. TRAPPIST-1). Great for astronomy, education and space apps.

api.oanor.com/exoplanets-api

A catalogue of 9,000+ stars — every named star plus all naked-eye stars to magnitude 6.5 — from the HYG database. Look up a star by name, search and filter by constellation and brightness, list the brightest stars (overall or per constellation), and browse all 88 constellations. Each star includes its constellation, apparent and absolute magnitude, spectral class, distance in light-years and coordinates. Great for astronomy, education and stargazing apps.

api.oanor.com/stars-api

Explore 4,100+ dinosaur genera from the Paleobiology Database. For each dinosaur get the geologic period it lived in (Triassic, Jurassic or Cretaceous), its age range in millions of years, the stratigraphic intervals and who first named it. Look one up by name, search the catalogue, filter by period, or get a random dinosaur — perfect for education apps, games, quizzes and museum tooling.

api.oanor.com/dinosaurs-api

The complete periodic table as an API — all 119 chemical elements with their atomic and physical properties: atomic number and mass, category, phase, melting and boiling point, density, electron configuration, electronegativity, ionization energies and a short summary. Look up an element by symbol, atomic number or name, search and filter by category/phase/block, or fetch the whole table. Ideal for chemistry tools, education apps and science projects.

api.oanor.com/elements-api

Classify any location's climate with the Köppen-Geiger system — the standard used across geography, ecology, agriculture and architecture. Provide a location's twelve monthly mean temperatures and precipitation totals and get back its climate code (for example Cfb or BWh), the climate group and full name, a description, and a block of derived statistics (annual mean temperature, annual precipitation, warmest and coldest month, driest month, months above 10 °C, summer-precipitation share and the aridity threshold). The hemisphere is auto-detected from the temperature curve, or you can set it explicitly. A reference endpoint returns all thirty Köppen-Geiger codes with names, groups, descriptions and example cities. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side computation (no third-party upstream), so responses are instant and always available. Ideal for EdTech and geography tools, AgTech and crop-suitability apps, architecture and GIS pipelines.

api.oanor.com/climate-api

Physical and orbital data for the solar system and beyond: every planet, dwarf planet, major moon and the Sun with NASA fact-sheet values (mass, radius, surface gravity, density, escape velocity, mean temperature, orbital and rotation period, semi-major axis, moon count and rings), plus a searchable catalogue of more than 6,000 confirmed exoplanets from the NASA Exoplanet Archive (radius, mass, orbital period, equilibrium temperature, distance in light-years, host star, discovery year and method). Filter exoplanets by host star, discovery method, year, size or distance, compare solar-system bodies side by side, and look up any single body or exoplanet by name. Every endpoint accepts input via the query string or the request body and returns lean JSON. Pure server-side data (no third-party upstream), so responses are instant and always available. Ideal for education, EdTech, astronomy apps, data visualisation and science tools.

api.oanor.com/planets-api

A fast, fully-local astronomy and ephemeris engine: compute the equatorial (right-ascension/declination) and horizontal (azimuth/altitude) positions of the Sun, Moon and all planets for any observer and moment, get precise rise, set and transit (culmination) times for any body, read detailed lunar state (phase angle, named phase, illuminated fraction, apparent magnitude, geocentric distance, age since the last new moon and the dates of the next new/first-quarter/full/last-quarter moons), and list the exact equinoxes and solstices of any year. Every endpoint accepts input via the query string or the request body. Pure server-side computation (no third-party upstream), so responses are instant and always available. Ideal for weather and tide apps, astrophotography planners, calendars, solar/energy tools, Islamic and lunar calendars, and education.

api.oanor.com/astronomy-api

Browse Nobel Prizes by year and category — physics, chemistry, medicine, literature, peace and economics — with laureates and their official citations, and look up laureate profiles by name or id with birth details and every prize won. Great for education, trivia, research and history apps.

api.oanor.com/nobel-api

Search the NASA Image and Video Library — Apollo, Hubble, Mars rovers, the ISS and decades of mission imagery — and fetch the asset file URLs in every resolution for any item. Great for space, education, media, wallpaper and museum apps. All NASA media is public domain.

api.oanor.com/nasa-api

Latest, next and recent SpaceX launches with mission details, success status, mission patches, webcasts and articles, a single-launch lookup by id, and the full rocket fleet with specs, success rates and imagery. Great for space dashboards, trackers, education and hobby projects.

api.oanor.com/spacex-api