Best Free APIs Directory

Find free APIs for AI, weather, finance, and development projects in our curated directory.

The Best Free APIs for Developers

Find the perfect free API for your next project. Our curated directory features hundreds of free APIs across AI, weather, finance, and developer tools - all verified to offer genuine free tiers without credit card requirements.

Whether you need AI APIs for natural language processing, Weather APIs for forecasts and historical data, Finance APIs for stock and crypto data, or Developer APIs for GitHub integration and more - we have you covered.

Pro tip: Each API card includes a copy button for the endpoint URL. Click to copy and integrate into your projects quickly.

Showing 1057-1104 of 1467 APIs

Flickr logo

Flickr

Photography

Free

Flickr is an API listed in the Photography category that provides access to flickr Services. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Flickr a useful integration candidate when a project needs flickr Services through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Getty Images logo

Getty Images

Photography

Free

Getty Images is an API listed in the Photography category that provides access to build applications using the world's most powerful imagery. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Getty Images a useful integration candidate when a project needs build applications using the world's most powerful imagery through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Gfycat logo

Gfycat

Photography

Free

Gfycat is an API listed in the Photography category that provides access to jiffier GIFs. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Gfycat a useful integration candidate when a project needs jiffier GIFs through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Giphy logo

Giphy

Photography

Free

Giphy is an API listed in the Photography category that provides access to get all your gifs. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Giphy a useful integration candidate when a project needs get all your gifs through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
Google Photos logo

Google Photos

Photography

Free

Google Photos is an API listed in the Photography category that provides access to integrate Google Photos with your apps or devices. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Google Photos a useful integration candidate when a project needs integrate Google Photos with your apps or devices through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Image Upload logo

Image Upload

Photography

Free

Image Upload is an API listed in the Photography category that provides access to image Optimization. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Image Upload a useful integration candidate when a project needs image Optimization through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
Imgur logo

Imgur

Photography

Free

Imgur is an API listed in the Photography category that provides access to images. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Imgur a useful integration candidate when a project needs images through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Imsea logo

Imsea

Photography

Free

Imsea is an API listed in the Photography category that provides access to free image search. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes Imsea a useful integration candidate when a project needs free image search through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

PhotographyNotrue
Lorem Picsum logo

Lorem Picsum

Photography

Free

Lorem Picsum is an API listed in the Photography category that provides access to images from Unsplash. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes Lorem Picsum a useful integration candidate when a project needs images from Unsplash through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

PhotographyNotrue
ObjectCut logo

ObjectCut

Photography

Free

ObjectCut is an API listed in the Photography category that provides access to image Background removal. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available; CORS is listed as Yes. This makes ObjectCut a useful integration candidate when a project needs image Background removal through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
Pexels logo

Pexels

Photography

Free

Pexels is an API listed in the Photography category that provides access to free Stock Photos and Videos. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available; CORS is listed as Yes. This makes Pexels a useful integration candidate when a project needs free Stock Photos and Videos through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
PhotoRoom logo

PhotoRoom

Photography

Free

PhotoRoom is an API listed in the Photography category that provides access to remove background from images. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes PhotoRoom a useful integration candidate when a project needs remove background from images through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
Pixabay logo

Pixabay

Photography

Free

Pixabay is an API listed in the Photography category that provides access to photography. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Pixabay a useful integration candidate when a project needs photography through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
PlaceKeanu logo

PlaceKeanu

Photography

Free

PlaceKeanu is an API listed in the Photography category that provides access to resizable Keanu Reeves placeholder images with grayscale and young Keanu options. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes PlaceKeanu a useful integration candidate when a project needs resizable Keanu Reeves placeholder images with grayscale and young Keanu options through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

PhotographyNotrue
Free

Readme typing SVG is an API listed in the Photography category that provides access to customizable typing and deleting text SVG. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes Readme typing SVG a useful integration candidate when a project needs customizable typing and deleting text SVG through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

PhotographyNotrue
Remove.bg logo

Remove.bg

Photography

Free

Remove.bg is an API listed in the Photography category that provides access to image Background removal. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Remove.bg a useful integration candidate when a project needs image Background removal through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
ReSmush.it logo

ReSmush.it

Photography

Free

ReSmush.it is an API listed in the Photography category that provides access to photo optimization. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as unavailable. This makes ReSmush.it a useful integration candidate when a project needs photo optimization through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

PhotographyNofalse
shutterstock logo

shutterstock

Photography

Free

shutterstock is an API listed in the Photography category that provides access to stock Photos and Videos. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes shutterstock a useful integration candidate when a project needs stock Photos and Videos through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Sirv logo

Sirv

Photography

Free

Sirv is an API listed in the Photography category that provides access to image management solutions like optimization, manipulation, hosting. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Sirv a useful integration candidate when a project needs image management solutions like optimization, manipulation, hosting through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
Unsplash logo

Unsplash

Photography

Free

Unsplash is an API listed in the Photography category that provides access to photography. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Unsplash a useful integration candidate when a project needs photography through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Wallhaven logo

Wallhaven

Photography

Free

Wallhaven is an API listed in the Photography category that provides access to wallpapers. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Wallhaven a useful integration candidate when a project needs wallpapers through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`apiKey`true
Webdam logo

Webdam

Photography

Free

Webdam is an API listed in the Photography category that provides access to images. It is intended for developers who want to integrate this type of photography data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available. This makes Webdam a useful integration candidate when a project needs images through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Photography`OAuth`true
Codeforces logo

Codeforces

Programming

Free

Codeforces is an API listed in the Programming category that provides access to get access to Codeforces data. It is intended for developers who want to integrate this type of programming data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Codeforces a useful integration candidate when a project needs get access to Codeforces data through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Programming`apiKey`true
Hackerearth logo

Hackerearth

Programming

Free

Hackerearth is an API listed in the Programming category that provides access to for compiling and running code in several languages. It is intended for developers who want to integrate this type of programming data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Hackerearth a useful integration candidate when a project needs for compiling and running code in several languages through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Programming`apiKey`true
Judge0 CE logo

Judge0 CE

Programming

Free

Judge0 CE is an API listed in the Programming category that provides access to online code execution system. It is intended for developers who want to integrate this type of programming data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes Judge0 CE a useful integration candidate when a project needs online code execution system through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Programming`apiKey`true
KONTESTS logo

KONTESTS

Programming

Free

KONTESTS is an API listed in the Programming category that provides access to for upcoming and ongoing competitive coding contests. It is intended for developers who want to integrate this type of programming data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes KONTESTS a useful integration candidate when a project needs for upcoming and ongoing competitive coding contests through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

ProgrammingNotrue
Mintlify logo

Mintlify

Programming

Free

Mintlify is an API listed in the Programming category that provides access to for programmatically generating documentation for code. It is intended for developers who want to integrate this type of programming data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available; CORS is listed as Yes. This makes Mintlify a useful integration candidate when a project needs for programmatically generating documentation for code through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Programming`apiKey`true
arcsecond.io logo

arcsecond.io

Science & Math

Free

arcsecond.io is an API listed in the Science & Math category that provides access to multiple astronomy data sources. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes arcsecond.io a useful integration candidate when a project needs multiple astronomy data sources through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
arXiv logo

arXiv

Science & Math

Free

arXiv is an API listed in the Science & Math category that provides access to curated research-sharing platform: physics, mathematics, quantitative finance, and economics. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes arXiv a useful integration candidate when a project needs curated research-sharing platform: physics, mathematics, quantitative finance, and economics through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
CodeCogs logo

CodeCogs

Science & Math

Free

CodeCogs is an API listed in the Science & Math category that provides access to render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes CodeCogs a useful integration candidate when a project needs render LaTeX equations in PNG, GIF, SVG, EMF, PDF, JSON, or download formats with styling options through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
CORE logo

CORE

Science & Math

Free

CORE is an API listed in the Science & Math category that provides access to access the world's Open Access research papers. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available. This makes CORE a useful integration candidate when a project needs access the world's Open Access research papers through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & Math`apiKey`true
GBIF logo

GBIF

Science & Math

Free

GBIF is an API listed in the Science & Math category that provides access to global Biodiversity Information Facility. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available; CORS is listed as Yes. This makes GBIF a useful integration candidate when a project needs global Biodiversity Information Facility through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
iDigBio logo

iDigBio

Science & Math

Free

iDigBio is an API listed in the Science & Math category that provides access to access millions of museum specimens from organizations around the world. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes iDigBio a useful integration candidate when a project needs access millions of museum specimens from organizations around the world through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
inspirehep.net logo

inspirehep.net

Science & Math

Free

inspirehep.net is an API listed in the Science & Math category that provides access to high Energy Physics info. system. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes inspirehep.net a useful integration candidate when a project needs high Energy Physics info. system through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
isEven (humor) logo

isEven (humor)

Science & Math

Free

isEven (humor) is an API listed in the Science & Math category that provides access to check if a number is even. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes isEven (humor) a useful integration candidate when a project needs check if a number is even through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
ISRO logo

ISRO

Science & Math

Free

ISRO is an API listed in the Science & Math category that provides access to ISRO Space Crafts Information. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available; CORS is listed as No. This makes ISRO a useful integration candidate when a project needs ISRO Space Crafts Information through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
ITIS logo

ITIS

Science & Math

Free

ITIS is an API listed in the Science & Math category that provides access to integrated Taxonomic Information System. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes ITIS a useful integration candidate when a project needs integrated Taxonomic Information System through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
Launch Library 2 logo

Launch Library 2

Science & Math

Free

Launch Library 2 is an API listed in the Science & Math category that provides access to spaceflight launches and events database. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available; CORS is listed as Yes. This makes Launch Library 2 a useful integration candidate when a project needs spaceflight launches and events database through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue

Materials Platform for Data Science is an API listed in the Science & Math category that provides access to curated experimental data for materials science. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available; CORS is listed as No. This makes Materials Platform for Data Science a useful integration candidate when a project needs curated experimental data for materials science through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & Math`apiKey`true
Minor Planet Center logo

Minor Planet Center

Science & Math

Free

Minor Planet Center is an API listed in the Science & Math category that provides access to asterank.com Information. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as unavailable. This makes Minor Planet Center a useful integration candidate when a project needs asterank.com Information through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNofalse
NASA logo

NASA

Science & Math

Free

NASA is an API listed in the Science & Math category that provides access to NASA data, including imagery. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available; CORS is listed as No. This makes NASA a useful integration candidate when a project needs NASA data, including imagery through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
NASA ADS logo

NASA ADS

Science & Math

Free

NASA ADS is an API listed in the Science & Math category that provides access to NASA Astrophysics Data System. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies OAuth as the authentication method; HTTPS support is listed as available; CORS is listed as Yes. This makes NASA ADS a useful integration candidate when a project needs NASA Astrophysics Data System through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & Math`OAuth`true
Newton logo

Newton

Science & Math

Free

Newton is an API listed in the Science & Math category that provides access to symbolic and Arithmetic Math Calculator. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available; CORS is listed as No. This makes Newton a useful integration candidate when a project needs symbolic and Arithmetic Math Calculator through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
Noctua logo

Noctua

Science & Math

Free

Noctua is an API listed in the Science & Math category that provides access to REST API used to access NoctuaSky features. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes Noctua a useful integration candidate when a project needs REST API used to access NoctuaSky features through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
Numbers logo

Numbers

Science & Math

Free

Numbers is an API listed in the Science & Math category that provides access to number of the day, random number, number facts and anything else you want to do with numbers. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing identifies apiKey as the authentication method; HTTPS support is listed as available; CORS is listed as No. This makes Numbers a useful integration candidate when a project needs number of the day, random number, number facts and anything else you want to do with numbers through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & Math`apiKey`true
Ocean Facts logo

Ocean Facts

Science & Math

Free

Ocean Facts is an API listed in the Science & Math category that provides access to facts pertaining to the physical science of Oceanography. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes Ocean Facts a useful integration candidate when a project needs facts pertaining to the physical science of Oceanography through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue
Open Notify logo

Open Notify

Science & Math

Free

Open Notify is an API listed in the Science & Math category that provides access to ISS astronauts, current location, etc. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as unavailable; CORS is listed as No. This makes Open Notify a useful integration candidate when a project needs ISS astronauts, current location, etc through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNofalse
Free

Open Science Framework is an API listed in the Science & Math category that provides access to repository and archive for study designs, research materials, data, manuscripts, etc. It is intended for developers who want to integrate this type of science & math data or functionality into websites, mobile applications, dashboards, automation workflows, research projects, prototypes, or backend services without building the underlying data source or service from scratch. From the supplied API metadata, the supplied listing indicates that authentication is not required; HTTPS support is listed as available. This makes Open Science Framework a useful integration candidate when a project needs repository and archive for study designs, research materials, data, manuscripts, etc through a programmatic interface. Because API capabilities, quotas, authentication rules, endpoints, and availability can change over time, the provider documentation should be treated as the current technical reference.

Science & MathNotrue

Frequently Asked Questions About Free APIs

What are the best free APIs for developers?

The best free APIs include OpenAI API (free tier), GitHub REST API, OpenWeather API, and Alpha Vantage for finance data. Our directory lists hundreds of free APIs across AI, weather, finance, and developer categories.

Do these APIs require a credit card?

Most APIs in our directory offer free tiers that don't require a credit card. Some may require registration for an API key, but you won't be charged for basic usage within their free limits.

How do I integrate these APIs into my project?

Each API listing includes the endpoint URL with a copy button. Click to copy the endpoint, then use it in your HTTP requests. Visit the API's documentation (linked on each page) for authentication details and usage examples.

What's the difference between free and paid API tiers?

Free API tiers typically have rate limits (requests per minute/day) and may offer fewer features. They're perfect for development, testing, and small projects. Paid tiers offer higher limits, more features, and SLAs for production use.

Can I use these APIs for commercial projects?

Most APIs allow commercial use on their free tiers, but check each API's terms of service. Some may require attribution or have specific usage restrictions for commercial applications.