{
  "info": {
    "_postman_id": "akclnt-science-space-akclnt-free-apis",
    "name": "Science & Space — AKCLNT Free APIs",
    "description": "Free APIs from AKCLNT Free APIs (freeapis.akclnt.com) — statuses and limits verified 23 Oct 2026. Regenerated weekly.",
    "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
  },
  "item": [
    {
      "name": "NASA APIs",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://api.nasa.gov/planetary/apod?api_key=DEMO_KEY",
        "description": "Astronomy picture of the day, Mars rovers, asteroids and more. DEMO_KEY works instantly.\nAuth: free key · CORS: yes · Limits: Free key; DEMO_KEY: 30 req/hr\nListing: https://freeapis.akclnt.com/api/nasa-apis/"
      }
    },
    {
      "name": "NASA Image Library",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://images-api.nasa.gov/search?q=apollo%2011&page_size=1",
        "description": "Search NASA's entire image and video archive — no key needed.\nAuth: none · CORS: yes · Limits: Free, no key\nListing: https://freeapis.akclnt.com/api/nasa-image-library/"
      }
    },
    {
      "name": "SpaceX API (unofficial) (DOWN at last check)",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://api.spacexdata.com/v5/launches/latest",
        "description": "Launches, rockets, capsules and Starlink data from the community SpaceX API.\nAuth: none · CORS: yes · Limits: Free, unofficial, no key\nListing: https://freeapis.akclnt.com/api/spacex-api-unofficial/"
      }
    },
    {
      "name": "USGS Earthquakes",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://earthquake.usgs.gov/fdsnws/event/1/query?format=geojson&limit=2&orderby=magnitude",
        "description": "Real-time earthquake data from the US Geological Survey in GeoJSON.\nAuth: none · CORS: yes · Limits: Free, no key\nListing: https://freeapis.akclnt.com/api/usgs-earthquakes/"
      }
    },
    {
      "name": "arXiv API",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://export.arxiv.org/api/query?search_query=all:quantum&max_results=1",
        "description": "Search millions of open-access research preprints in physics, CS, math and more.\nAuth: none · CORS: yes · Limits: Free: 1 req/3sec\nListing: https://freeapis.akclnt.com/api/arxiv-api/"
      }
    },
    {
      "name": "Launch Library 2",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://ll.thespacedevs.com/2.2.0/launch/upcoming/?limit=1",
        "description": "Every upcoming rocket launch worldwide, from The Space Devs.\nAuth: none · CORS: yes · Limits: Free tier: 15 req/hr\nListing: https://freeapis.akclnt.com/api/launch-library-2/"
      }
    },
    {
      "name": "Open Notify — ISS",
      "request": {
        "method": "GET",
        "header": [],
        "url": "http://api.open-notify.org/iss-now.json",
        "description": "Where is the International Space Station right now? One tiny JSON answers it.\nAuth: none · CORS: yes · Limits: Free, HTTP only\nListing: https://freeapis.akclnt.com/api/open-notify-iss/"
      }
    },
    {
      "name": "1ClickImpact",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://1clickimpact.com",
        "description": "Environmental impact API for tree planting, carbon offsetting and ocean cleanup\nAuth: free key · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/1clickimpact/"
      }
    },
    {
      "name": "Carbon Interface",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://docs.carboninterface.com/",
        "description": "API to calculate carbon (C02) emissions estimates for common C02 emitting activities\nAuth: free key · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/carbon-interface/"
      }
    },
    {
      "name": "Climatiq",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://docs.climatiq.io",
        "description": "Calculate the environmental footprint created by a broad range of emission-generating activities\nAuth: free key · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/climatiq/"
      }
    },
    {
      "name": "Danish data service Energi",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://www.energidataservice.dk/",
        "description": "Open energy data from Energinet to society\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/danish-data-service-energi/"
      }
    },
    {
      "name": "DC Hub",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://dchub.cloud",
        "description": "Data Center Power Index (DCPI): daily scores of where data centers can get grid power across 300+ markets, plus grid, fiber and interconnection-queue data\nAuth: free key · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/dc-hub/"
      }
    },
    {
      "name": "Elpriser i dag",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://elprisernaidag.se/api/",
        "description": "Swedish electricity spot prices including VAT and energy tax, in 15-minute intervals\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/elpriser-i-dag/"
      }
    },
    {
      "name": "GrünstromIndex",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://gruenstromindex.de/",
        "description": "Green Power Index for Germany (Grünstromindex/GSI)\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/gr-nstromindex/"
      }
    },
    {
      "name": "IQAir",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://www.iqair.com/air-pollution-data-api",
        "description": "Air quality and weather data\nAuth: free key · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/iqair/"
      }
    },
    {
      "name": "Luchtmeetnet",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://api-docs.luchtmeetnet.nl/",
        "description": "Predicted and actual air quality components for The Netherlands (RIVM)\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/luchtmeetnet/"
      }
    },
    {
      "name": "OpenAQ",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://docs.openaq.org/",
        "description": "Open air quality data\nAuth: free key · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/openaq/"
      }
    },
    {
      "name": "PM2.5 Open Data Portal",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://pm25.lass-net.org/#apis",
        "description": "Open low-cost PM2.5 sensor data\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/pm2-5-open-data-portal/"
      }
    },
    {
      "name": "Smartatest",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://smartatest.se/api",
        "description": "Calculators for home energy cost, lighting, air quality limits and GS1 barcode prefixes, in Swedish\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/smartatest/"
      }
    },
    {
      "name": "Solematica",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://www.solematica.it/sviluppatori",
        "description": "Compare Italian solar installer offers, energy prices (PUN/ARERA) and satellite roof data\nAuth: none · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/solematica/"
      }
    },
    {
      "name": "Srp Energy",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://srpenergy-api-client-python.readthedocs.io/en/latest/api.html",
        "description": "Hourly usage energy report for Srp customers\nAuth: free key · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/srp-energy/"
      }
    },
    {
      "name": "Strømpriser i dag",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://strompriseridag.no/api/",
        "description": "Norwegian electricity prices including VAT and the state subsidy, plus grid tariffs for all 73 grid companies\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/str-mpriser-i-dag/"
      }
    },
    {
      "name": "Thames Water Open Data",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://data.thameswater.co.uk",
        "description": "Open Data from the UK's largest water and wastewater services company\nAuth: free key · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/thames-water-open-data/"
      }
    },
    {
      "name": "WattBuy",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://wattbuy.readme.io/reference/getting-started-with-your-api",
        "description": "Electricity usage estimations, carbon footprint estimations, and utility data\nAuth: free key · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/wattbuy/"
      }
    },
    {
      "name": "arcsecond.io",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://api.arcsecond.io/",
        "description": "Multiple astronomy data sources\nAuth: free key · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/arcsecond-io/"
      }
    },
    {
      "name": "Bootprint",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://bootprint.space/",
        "description": "Random facts and images of space\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/bootprint/"
      }
    },
    {
      "name": "CodeCogs",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://editor.codecogs.com/docs/4-LaTeX_rendering.php",
        "description": "Generate LaTeX equations as PNG, SVG, and GIF images\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/codecogs/"
      }
    },
    {
      "name": "CORE",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://core.ac.uk/services#api",
        "description": "Access the world's Open Access research papers\nAuth: free key · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/core/"
      }
    },
    {
      "name": "inspirehep.net",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://github.com/inspirehep/rest-api-doc",
        "description": "High Energy Physics info. system\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/inspirehep-net/"
      }
    },
    {
      "name": "isEven (humor)",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://isevenapi.xyz/",
        "description": "Check if a number is even\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/iseven-humor/"
      }
    },
    {
      "name": "ISRO",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://isro.vercel.app",
        "description": "ISRO Space Crafts Information\nAuth: none · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/isro/"
      }
    },
    {
      "name": "ITIS",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://www.itis.gov/ws_description.html",
        "description": "Integrated Taxonomic Information System\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/itis/"
      }
    },
    {
      "name": "Materials Platform for Data Science",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://mpds.io",
        "description": "Curated experimental data for materials science\nAuth: free key · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/materials-platform-for-data-science/"
      }
    },
    {
      "name": "Moonlora",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://moonlora.com/developers",
        "description": "Moon phases, illumination, moon signs, full/new moon dates (1900–2100), moonrise/moonset by coordinates\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/moonlora/"
      }
    },
    {
      "name": "NASA ADS",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://ui.adsabs.harvard.edu/help/api/api-docs.html",
        "description": "NASA Astrophysics Data System\nAuth: free key · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/nasa-ads/"
      }
    },
    {
      "name": "Newton",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://newton.vercel.app",
        "description": "Symbolic and Arithmetic Math Calculator\nAuth: none · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/newton/"
      }
    },
    {
      "name": "Open Science Framework",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://developer.osf.io",
        "description": "Repository and archive for study designs, research materials, data, manuscripts, etc\nAuth: free key · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/open-science-framework/"
      }
    },
    {
      "name": "OrbitalWiki",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://www.orbitalwiki.com",
        "description": "Catalog of 16,000+ satellites with the source cited for every field: orbital elements, operators, NORAD/COSPAR IDs\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/orbitalwiki/"
      }
    },
    {
      "name": "Purple Air",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://www2.purpleair.com/",
        "description": "Real Time Air Quality Monitoring\nAuth: none · CORS: unknown · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/purple-air/"
      }
    },
    {
      "name": "Satellite Passes",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://sat.terrestre.ar",
        "description": "Find satellite passes\nAuth: none · CORS: yes · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/satellite-passes/"
      }
    },
    {
      "name": "Times Adder",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://github.com/FranP-code/API-Times-Adder",
        "description": "With this API you can add each of the times introduced in the array sent\nAuth: none · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/times-adder/"
      }
    },
    {
      "name": "TLE",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://tle.ivanstanojevic.me",
        "description": "Satellite information\nAuth: none · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/tle/"
      }
    },
    {
      "name": "USGS Water Services",
      "request": {
        "method": "GET",
        "header": [],
        "url": "https://waterservices.usgs.gov/",
        "description": "Water quality and level info for rivers and lakes\nAuth: none · CORS: no · Limits: Free tier — confirm exact limits in the official docs\nListing: https://freeapis.akclnt.com/api/usgs-water-services/"
      }
    }
  ]
}