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 1105-1152 of 1467 APIs

OpenAlex logo

OpenAlex

Science & Math

Free

OpenAlex is an API listed in the Science & Math category that provides access to open catalog of scholarly works, authors, institutions, sources, and concepts. 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 OpenAlex a useful integration candidate when a project needs open catalog of scholarly works, authors, institutions, sources, and concepts 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
Purple Air logo

Purple Air

Science & Math

Free

Purple Air is an API listed in the Science & Math category that provides access to real Time Air Quality Monitoring. 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 Purple Air a useful integration candidate when a project needs real Time Air Quality Monitoring 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
Remote Calc logo

Remote Calc

Science & Math

Free

Remote Calc is an API listed in the Science & Math category that provides access to decodes base64 encoding and parses it to return a solution to the calculation in JSON. 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 Remote Calc a useful integration candidate when a project needs decodes base64 encoding and parses it to return a solution to the calculation in JSON 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
SHARE logo

SHARE

Science & Math

Free

SHARE is an API listed in the Science & Math category that provides access to a free, open, dataset about research and scholarly activities. 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 SHARE a useful integration candidate when a project needs a free, open, dataset about research and scholarly activities 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
SpaceX logo

SpaceX

Science & Math

Free

SpaceX is an API listed in the Science & Math category that provides access to company, vehicle, launchpad and launch data. 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 SpaceX a useful integration candidate when a project needs company, vehicle, launchpad and launch 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.

Science & MathNotrue
Sunrise and Sunset logo

Sunrise and Sunset

Science & Math

Free

Sunrise and Sunset is an API listed in the Science & Math category that provides access to sunset and sunrise times for a given latitude and longitude. 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 Sunrise and Sunset a useful integration candidate when a project needs sunset and sunrise times for a given latitude and longitude 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
Times Adder logo

Times Adder

Science & Math

Free

Times Adder is an API listed in the Science & Math category that provides access to with this API you can add each of the times introduced in the array sended. 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 Times Adder a useful integration candidate when a project needs with this API you can add each of the times introduced in the array sended 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
TLE logo

TLE

Science & Math

Free

TLE is an API listed in the Science & Math category that provides access to satellite 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 TLE a useful integration candidate when a project needs satellite 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

USGS Earthquake Hazards Program is an API listed in the Science & Math category that provides access to earthquakes data real-time. 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 USGS Earthquake Hazards Program a useful integration candidate when a project needs earthquakes data real-time 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
USGS Water Services logo

USGS Water Services

Science & Math

Free

USGS Water Services is an API listed in the Science & Math category that provides access to water quality and level info for rivers and lakes. 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 USGS Water Services a useful integration candidate when a project needs water quality and level info for rivers and lakes 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
World Bank logo

World Bank

Science & Math

Free

World Bank is an API listed in the Science & Math category that provides access to world Data. 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 World Bank a useful integration candidate when a project needs world 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.

Science & MathNotrue
xMath logo

xMath

Science & Math

Free

xMath is an API listed in the Science & Math category that provides access to random mathematical expressions. 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 xMath a useful integration candidate when a project needs random mathematical expressions 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

Application Environment Verification is an API listed in the Security category that provides access to android library and API to verify the safety of user devices, detect rooted devices and other risks. It is intended for developers who want to integrate this type of security 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 Application Environment Verification a useful integration candidate when a project needs android library and API to verify the safety of user devices, detect rooted devices and other risks 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.

Security`apiKey`true
BinaryEdge logo

BinaryEdge

Security

Free

BinaryEdge is an API listed in the Security category that provides access to provide access to BinaryEdge 40fy scanning platform. It is intended for developers who want to integrate this type of security 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 BinaryEdge a useful integration candidate when a project needs provide access to BinaryEdge 40fy scanning platform 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.

Security`apiKey`true
BitWarden logo

BitWarden

Security

Free

BitWarden is an API listed in the Security category that provides access to best open-source password manager. It is intended for developers who want to integrate this type of security 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 BitWarden a useful integration candidate when a project needs best open-source password manager 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.

Security`OAuth`true
Botd logo

Botd

Security

Free

Botd is an API listed in the Security category that provides access to botd is a browser library for JavaScript bot detection. It is intended for developers who want to integrate this type of security 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 Botd a useful integration candidate when a project needs botd is a browser library for JavaScript bot detection 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.

Security`apiKey`true
Bugcrowd logo

Bugcrowd

Security

Free

Bugcrowd is an API listed in the Security category that provides access to bugcrowd API for interacting and tracking the reported issues programmatically. It is intended for developers who want to integrate this type of security 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 Bugcrowd a useful integration candidate when a project needs bugcrowd API for interacting and tracking the reported issues programmatically 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.

Security`apiKey`true
Censys logo

Censys

Security

Free

Censys is an API listed in the Security category that provides access to search engine for Internet connected host and devices. It is intended for developers who want to integrate this type of security 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 Censys a useful integration candidate when a project needs search engine for Internet connected host and 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.

Security`apiKey`true
Classify logo

Classify

Security

Free

Classify is an API listed in the Security category that provides access to encrypting & decrypting text messages. It is intended for developers who want to integrate this type of security 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 Classify a useful integration candidate when a project needs encrypting & decrypting text messages 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.

SecurityNotrue

Complete Criminal Checks is an API listed in the Security category that provides access to provides data of offenders from all U.S. States and Pureto Rico. It is intended for developers who want to integrate this type of security 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 Complete Criminal Checks a useful integration candidate when a project needs provides data of offenders from all U.S. States and Pureto Rico 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.

Security`apiKey`true
CRXcavator logo

CRXcavator

Security

Free

CRXcavator is an API listed in the Security category that provides access to chrome extension risk scoring. It is intended for developers who want to integrate this type of security 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 CRXcavator a useful integration candidate when a project needs chrome extension risk scoring 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.

Security`apiKey`true
dead-drop logo

dead-drop

Security

Free

dead-drop is an API listed in the Security category that provides access to ephemeral zero-knowledge encrypted data sharing. It is intended for developers who want to integrate this type of security 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 dead-drop a useful integration candidate when a project needs ephemeral zero-knowledge encrypted data sharing 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.

SecurityNotrue
Dehash.lt logo

Dehash.lt

Security

Free

Dehash.lt is an API listed in the Security category that provides access to hash decryption MD5, SHA1, SHA3, SHA256, SHA384, SHA512. It is intended for developers who want to integrate this type of security 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 Dehash.lt a useful integration candidate when a project needs hash decryption MD5, SHA1, SHA3, SHA256, SHA384, SHA512 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.

SecurityNotrue
EmailRep logo

EmailRep

Security

Free

EmailRep is an API listed in the Security category that provides access to email address threat and risk prediction. It is intended for developers who want to integrate this type of security 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 EmailRep a useful integration candidate when a project needs email address threat and risk prediction 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.

SecurityNotrue
Escape logo

Escape

Security

Free

Escape is an API listed in the Security category that provides access to an API for escaping different kind of queries. It is intended for developers who want to integrate this type of security 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 Escape a useful integration candidate when a project needs an API for escaping different kind of queries 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.

SecurityNotrue
FilterLists logo

FilterLists

Security

Free

FilterLists is an API listed in the Security category that provides access to lists of filters for adblockers and firewalls. It is intended for developers who want to integrate this type of security 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 FilterLists a useful integration candidate when a project needs lists of filters for adblockers and firewalls 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.

SecurityNotrue
Free

FingerprintJS Pro is an API listed in the Security category that provides access to fraud detection API offering highly accurate browser fingerprinting. It is intended for developers who want to integrate this type of security 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 FingerprintJS Pro a useful integration candidate when a project needs fraud detection API offering highly accurate browser fingerprinting 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.

Security`apiKey`true
Free

FraudLabs Pro is an API listed in the Security category that provides access to screen order information using AI to detect frauds. It is intended for developers who want to integrate this type of security 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 FraudLabs Pro a useful integration candidate when a project needs screen order information using AI to detect frauds 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.

Security`apiKey`true
FullHunt logo

FullHunt

Security

Free

FullHunt is an API listed in the Security category that provides access to searchable attack surface database of the entire internet. It is intended for developers who want to integrate this type of security 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 FullHunt a useful integration candidate when a project needs searchable attack surface database of the entire internet 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.

Security`apiKey`true
GitGuardian logo

GitGuardian

Security

Free

GitGuardian is an API listed in the Security category that provides access to scan files for secrets (API Keys, database credentials). It is intended for developers who want to integrate this type of security 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 GitGuardian a useful integration candidate when a project needs scan files for secrets (API Keys, database credentials) 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.

Security`apiKey`true
GreyNoise logo

GreyNoise

Security

Free

GreyNoise is an API listed in the Security category that provides access to query IPs in the GreyNoise dataset and retrieve a subset of the full IP context data. It is intended for developers who want to integrate this type of security 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 GreyNoise a useful integration candidate when a project needs query IPs in the GreyNoise dataset and retrieve a subset of the full IP context 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.

Security`apiKey`true
HackerOne logo

HackerOne

Security

Free

HackerOne is an API listed in the Security category that provides access to the industry’s first hacker API that helps increase productivity towards creative bug bounty hunting. It is intended for developers who want to integrate this type of security 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 HackerOne a useful integration candidate when a project needs the industry’s first hacker API that helps increase productivity towards creative bug bounty hunting 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.

Security`apiKey`true
Hashable logo

Hashable

Security

Free

Hashable is an API listed in the Security category that provides access to a REST API to access high level cryptographic functions and methods. It is intended for developers who want to integrate this type of security 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 Hashable a useful integration candidate when a project needs a REST API to access high level cryptographic functions and methods 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.

SecurityNotrue
Free

HaveIBeenPwned is an API listed in the Security category that provides access to passwords which have previously been exposed in data breaches. It is intended for developers who want to integrate this type of security 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 HaveIBeenPwned a useful integration candidate when a project needs passwords which have previously been exposed in data breaches 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.

Security`apiKey`true
Free

Intelligence X is an API listed in the Security category that provides access to perform OSINT via Intelligence X. It is intended for developers who want to integrate this type of security 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 Intelligence X a useful integration candidate when a project needs perform OSINT via Intelligence X 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.

Security`apiKey`true
IPLogs logo

IPLogs

Security

Free

IPLogs is an API listed in the Security category that provides access to free VPN, proxy, Tor and datacenter IP detection. 13 sources, active probing. It is intended for developers who want to integrate this type of security 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 IPLogs a useful integration candidate when a project needs free VPN, proxy, Tor and datacenter IP detection. 13 sources, active probing 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.

SecurityNotrue
LoginRadius logo

LoginRadius

Security

Free

LoginRadius is an API listed in the Security category that provides access to managed User Authentication Service. It is intended for developers who want to integrate this type of security 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 LoginRadius a useful integration candidate when a project needs managed User Authentication Service 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.

Security`apiKey`true

Microsoft Security Response Center (MSRC) is an API listed in the Security category that provides access to programmatic interfaces to engage with the Microsoft Security Response Center (MSRC). It is intended for developers who want to integrate this type of security 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 Microsoft Security Response Center (MSRC) a useful integration candidate when a project needs programmatic interfaces to engage with the Microsoft Security Response Center (MSRC) 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.

SecurityNotrue

Mozilla http scanner is an API listed in the Security category that provides access to mozilla observatory http scanner. It is intended for developers who want to integrate this type of security 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 Mozilla http scanner a useful integration candidate when a project needs mozilla observatory http scanner 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.

SecurityNotrue

Mozilla tls scanner is an API listed in the Security category that provides access to mozilla observatory tls scanner. It is intended for developers who want to integrate this type of security 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 Mozilla tls scanner a useful integration candidate when a project needs mozilla observatory tls scanner 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.

SecurityNotrue

National Vulnerability Database is an API listed in the Security category that provides access to u.S. National Vulnerability Database. It is intended for developers who want to integrate this type of security 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 National Vulnerability Database a useful integration candidate when a project needs u.S. National Vulnerability 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.

SecurityNotrue
Free

Passwordinator is an API listed in the Security category that provides access to generate random passwords of varying complexities. It is intended for developers who want to integrate this type of security 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 Passwordinator a useful integration candidate when a project needs generate random passwords of varying complexities 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.

SecurityNotrue
PhishStats logo

PhishStats

Security

Free

PhishStats is an API listed in the Security category that provides access to phishing database. It is intended for developers who want to integrate this type of security 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 PhishStats a useful integration candidate when a project needs phishing 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.

SecurityNotrue
Privacy.com logo

Privacy.com

Security

Free

Privacy.com is an API listed in the Security category that provides access to generate merchant-specific and one-time use credit card numbers that link back to your bank. It is intended for developers who want to integrate this type of security 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 Privacy.com a useful integration candidate when a project needs generate merchant-specific and one-time use credit card numbers that link back to your bank 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.

Security`apiKey`true
Pulsedive logo

Pulsedive

Security

Free

Pulsedive is an API listed in the Security category that provides access to scan, search and collect threat intelligence data in real-time. It is intended for developers who want to integrate this type of security 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 Pulsedive a useful integration candidate when a project needs scan, search and collect threat intelligence data in real-time 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.

Security`apiKey`true
Free

SecurityTrails is an API listed in the Security category that provides access to domain and IP related information such as current and historical WHOIS and DNS records. It is intended for developers who want to integrate this type of security 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 SecurityTrails a useful integration candidate when a project needs domain and IP related information such as current and historical WHOIS and DNS records 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.

Security`apiKey`true
Shodan logo

Shodan

Security

Free

Shodan is an API listed in the Security category that provides access to search engine for Internet connected devices. It is intended for developers who want to integrate this type of security 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 Shodan a useful integration candidate when a project needs search engine for Internet connected 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.

Security`apiKey`true
Spyse logo

Spyse

Security

Free

Spyse is an API listed in the Security category that provides access to access data on all Internet assets and build powerful attack surface management applications. It is intended for developers who want to integrate this type of security 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 Spyse a useful integration candidate when a project needs access data on all Internet assets and build powerful attack surface management applications 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.

Security`apiKey`true

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.