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 241-288 of 1467 APIs
Messari
Cryptocurrency
Messari is an API listed in the Cryptocurrency category that provides access to provides API endpoints for thousands of crypto assets. It is intended for developers who want to integrate this type of cryptocurrency 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 Messari a useful integration candidate when a project needs provides API endpoints for thousands of crypto assets 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.
Nexchange
Cryptocurrency
Nexchange is an API listed in the Cryptocurrency category that provides access to automated cryptocurrency exchange service. It is intended for developers who want to integrate this type of cryptocurrency 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 Yes. This makes Nexchange a useful integration candidate when a project needs automated cryptocurrency exchange 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.
Nomics
Cryptocurrency
Nomics is an API listed in the Cryptocurrency category that provides access to historical and realtime cryptocurrency prices and market data. It is intended for developers who want to integrate this type of cryptocurrency 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 Nomics a useful integration candidate when a project needs historical and realtime cryptocurrency prices and market 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.
NovaDax
Cryptocurrency
NovaDax is an API listed in the Cryptocurrency category that provides access to novaDAX API to access all market data, trading management endpoints. It is intended for developers who want to integrate this type of cryptocurrency 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 NovaDax a useful integration candidate when a project needs novaDAX API to access all market data, trading management endpoints 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.
OKEx
Cryptocurrency
OKEx is an API listed in the Cryptocurrency category that provides access to cryptocurrency exchange based in Seychelles. It is intended for developers who want to integrate this type of cryptocurrency 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 OKEx a useful integration candidate when a project needs cryptocurrency exchange based in Seychelles 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.
Poloniex
Cryptocurrency
Poloniex is an API listed in the Cryptocurrency category that provides access to US based digital asset exchange. It is intended for developers who want to integrate this type of cryptocurrency 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 Poloniex a useful integration candidate when a project needs US based digital asset exchange 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.
PumpFunData
Cryptocurrency
PumpFunData is an API listed in the Cryptocurrency category that provides access to historical Pump.fun and PumpSwap AMM swap data as hourly Parquet files. It is intended for developers who want to integrate this type of cryptocurrency 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 PumpFunData a useful integration candidate when a project needs historical Pump.fun and PumpSwap AMM swap data as hourly Parquet files 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.
Solana JSON RPC
Cryptocurrency
Solana JSON RPC is an API listed in the Cryptocurrency category that provides access to provides various endpoints to interact with the Solana Blockchain. It is intended for developers who want to integrate this type of cryptocurrency 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 Solana JSON RPC a useful integration candidate when a project needs provides various endpoints to interact with the Solana Blockchain 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.
Technical Analysis
Cryptocurrency
Technical Analysis is an API listed in the Cryptocurrency category that provides access to cryptocurrency prices and technical analysis. It is intended for developers who want to integrate this type of cryptocurrency 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 Technical Analysis a useful integration candidate when a project needs cryptocurrency prices and technical analysis 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.
VALR
Cryptocurrency
VALR is an API listed in the Cryptocurrency category that provides access to cryptocurrency Exchange based in South Africa. It is intended for developers who want to integrate this type of cryptocurrency 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 VALR a useful integration candidate when a project needs cryptocurrency Exchange based in South Africa 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.
WorldCoinIndex
Cryptocurrency
WorldCoinIndex is an API listed in the Cryptocurrency category that provides access to cryptocurrencies Prices. It is intended for developers who want to integrate this type of cryptocurrency 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 WorldCoinIndex a useful integration candidate when a project needs cryptocurrencies Prices 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.
ZMOK
Cryptocurrency
ZMOK is an API listed in the Cryptocurrency category that provides access to ethereum JSON RPC API and Web3 provider. It is intended for developers who want to integrate this type of cryptocurrency 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 ZMOK a useful integration candidate when a project needs ethereum JSON RPC API and Web3 provider 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.
Currencylayer
Currency Exchange
Currencylayer is an API listed in the Currency Exchange category that provides access to exchange rates and currency conversion. It is intended for developers who want to integrate this type of currency exchange 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 Currencylayer a useful integration candidate when a project needs exchange rates and currency conversion 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.
Exchangerate.host
Currency Exchange
Exchangerate.host is an API listed in the Currency Exchange category that provides access to free foreign exchange & crypto rates API. It is intended for developers who want to integrate this type of currency exchange 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 Exchangerate.host a useful integration candidate when a project needs free foreign exchange & crypto rates API 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.
Exchangeratesapi.io
Currency Exchange
Exchangeratesapi.io is an API listed in the Currency Exchange category that provides access to exchange rates with currency conversion. It is intended for developers who want to integrate this type of currency exchange 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 Exchangeratesapi.io a useful integration candidate when a project needs exchange rates with currency conversion 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.
Fixer
Currency Exchange
Fixer is an API listed in the Currency Exchange category that provides access to exchange rates and currency conversion. It is intended for developers who want to integrate this type of currency exchange 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 unavailable. This makes Fixer a useful integration candidate when a project needs exchange rates and currency conversion 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.
1Forge
Currency Exchange
1Forge is an API listed in the Currency Exchange category that provides access to forex currency market data. It is intended for developers who want to integrate this type of currency exchange 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 1Forge a useful integration candidate when a project needs forex currency market 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.
Amdoren
Currency Exchange
Amdoren is an API listed in the Currency Exchange category that provides access to free currency API with over 150 currencies. It is intended for developers who want to integrate this type of currency exchange 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 Amdoren a useful integration candidate when a project needs free currency API with over 150 currencies 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.
Bank of Russia
Currency Exchange
Bank of Russia is an API listed in the Currency Exchange category that provides access to exchange rates and currency conversion. It is intended for developers who want to integrate this type of currency exchange 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 Bank of Russia a useful integration candidate when a project needs exchange rates and currency conversion 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.
Currency-api
Currency Exchange
Currency-api is an API listed in the Currency Exchange category that provides access to free Currency Exchange Rates API with 150+ Currencies & No Rate Limits. It is intended for developers who want to integrate this type of currency exchange 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 Currency-api a useful integration candidate when a project needs free Currency Exchange Rates API with 150+ Currencies & No Rate Limits 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.
CurrencyFreaks
Currency Exchange
CurrencyFreaks is an API listed in the Currency Exchange category that provides access to provides current and historical currency exchange rates with free plan 1K requests/month. It is intended for developers who want to integrate this type of currency exchange 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 CurrencyFreaks a useful integration candidate when a project needs provides current and historical currency exchange rates with free plan 1K requests/month 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.
CurrencyScoop
Currency Exchange
CurrencyScoop is an API listed in the Currency Exchange category that provides access to real-time and historical currency rates JSON API. It is intended for developers who want to integrate this type of currency exchange 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 CurrencyScoop a useful integration candidate when a project needs real-time and historical currency rates JSON API 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.
Czech National Bank
Currency Exchange
Czech National Bank is an API listed in the Currency Exchange category that provides access to a collection of exchange rates. It is intended for developers who want to integrate this type of currency exchange 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 Czech National Bank a useful integration candidate when a project needs a collection of exchange rates 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.
Economia.Awesome
Currency Exchange
Economia.Awesome is an API listed in the Currency Exchange category that provides access to portuguese free currency prices and conversion with no rate limits. It is intended for developers who want to integrate this type of currency exchange 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 Economia.Awesome a useful integration candidate when a project needs portuguese free currency prices and conversion with no rate limits 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.
ExchangeRate-API
Currency Exchange
ExchangeRate-API is an API listed in the Currency Exchange category that provides access to free currency conversion. It is intended for developers who want to integrate this type of currency exchange 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 ExchangeRate-API a useful integration candidate when a project needs free currency conversion 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.
Frankfurter
Currency Exchange
Frankfurter is an API listed in the Currency Exchange category that provides access to exchange rates, currency conversion and time series. It is intended for developers who want to integrate this type of currency exchange 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 Frankfurter a useful integration candidate when a project needs exchange rates, currency conversion and time series 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.
FreeForexAPI
Currency Exchange
FreeForexAPI is an API listed in the Currency Exchange category that provides access to real-time foreign exchange rates for major currency pairs. It is intended for developers who want to integrate this type of currency exchange 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 FreeForexAPI a useful integration candidate when a project needs real-time foreign exchange rates for major currency pairs 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.
National Bank of Poland
Currency Exchange
National Bank of Poland is an API listed in the Currency Exchange category that provides access to a collection of currency exchange rates (data in XML and JSON). It is intended for developers who want to integrate this type of currency exchange 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 National Bank of Poland a useful integration candidate when a project needs a collection of currency exchange rates (data in XML and 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.
paralelo.bo
Currency Exchange
paralelo.bo is an API listed in the Currency Exchange category that provides access to bolivia parallel-market USD/BOB exchange rate, aggregated from P2P sources every 60s. It is intended for developers who want to integrate this type of currency exchange 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 paralelo.bo a useful integration candidate when a project needs bolivia parallel-market USD/BOB exchange rate, aggregated from P2P sources every 60s 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.
VATComply.com
Currency Exchange
VATComply.com is an API listed in the Currency Exchange category that provides access to exchange rates, geolocation and VAT number validation. It is intended for developers who want to integrate this type of currency exchange 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 VATComply.com a useful integration candidate when a project needs exchange rates, geolocation and VAT number validation 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.
VATlayer
Data Validation
VATlayer is an API listed in the Data Validation category that provides access to VAT number validation. It is intended for developers who want to integrate this type of data validation 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 VATlayer a useful integration candidate when a project needs VAT number validation 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.
Lob.com
Data Validation
Lob.com is an API listed in the Data Validation category that provides access to US Address Verification. It is intended for developers who want to integrate this type of data validation 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 Lob.com a useful integration candidate when a project needs US Address Verification 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.
Postman Echo
Data Validation
Postman Echo is an API listed in the Data Validation category that provides access to test api server to receive and return value from HTTP method. It is intended for developers who want to integrate this type of data validation 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 Postman Echo a useful integration candidate when a project needs test api server to receive and return value from HTTP method 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.
PurgoMalum
Data Validation
PurgoMalum is an API listed in the Data Validation category that provides access to content validator against profanity & obscenity. It is intended for developers who want to integrate this type of data validation 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 PurgoMalum a useful integration candidate when a project needs content validator against profanity & obscenity 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.
US Autocomplete
Data Validation
US Autocomplete is an API listed in the Data Validation category that provides access to enter address data quickly with real-time address suggestions. It is intended for developers who want to integrate this type of data validation 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 US Autocomplete a useful integration candidate when a project needs enter address data quickly with real-time address suggestions 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.
US Extract
Data Validation
US Extract is an API listed in the Data Validation category that provides access to extract postal addresses from any text including emails. It is intended for developers who want to integrate this type of data validation 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 US Extract a useful integration candidate when a project needs extract postal addresses from any text including emails 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.
US Street Address
Data Validation
US Street Address is an API listed in the Data Validation category that provides access to validate and append data for any US postal address. It is intended for developers who want to integrate this type of data validation 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 US Street Address a useful integration candidate when a project needs validate and append data for any US postal address 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.
Userstack
Development
Userstack is an API listed in the Development category that provides access to secure User-Agent String Lookup JSON API. It is intended for developers who want to integrate this type of development 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 Userstack a useful integration candidate when a project needs secure User-Agent String Lookup JSON API 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.
24 Pull Requests
Development
24 Pull Requests is an API listed in the Development category that provides access to project to promote open source collaboration during December. It is intended for developers who want to integrate this type of development 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 24 Pull Requests a useful integration candidate when a project needs project to promote open source collaboration during December 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.
Agify.io
Development
Agify.io is an API listed in the Development category that provides access to estimates the age from a first name. It is intended for developers who want to integrate this type of development 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 Agify.io a useful integration candidate when a project needs estimates the age from a first name 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.
API Grátis
Development
API Grátis is an API listed in the Development category that provides access to multiples services and public APIs. It is intended for developers who want to integrate this type of development 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 API Grátis a useful integration candidate when a project needs multiples services and public APIs 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.
ApicAgent
Development
ApicAgent is an API listed in the Development category that provides access to extract device details from user-agent string. It is intended for developers who want to integrate this type of development 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 ApicAgent a useful integration candidate when a project needs extract device details from user-agent string 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.
ApiFlash
Development
ApiFlash is an API listed in the Development category that provides access to chrome based screenshot API for developers. It is intended for developers who want to integrate this type of development 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 ApiFlash a useful integration candidate when a project needs chrome based screenshot API for developers 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.
APIs.guru
Development
APIs.guru is an API listed in the Development category that provides access to wikipedia for Web APIs, OpenAPI/Swagger specs for public APIs. It is intended for developers who want to integrate this type of development 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 APIs.guru a useful integration candidate when a project needs wikipedia for Web APIs, OpenAPI/Swagger specs for public APIs 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.
Azure DevOps
Development
Azure DevOps is an API listed in the Development category that provides access to the Azure DevOps basic components of a REST API request/response pair. It is intended for developers who want to integrate this type of development 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 Azure DevOps a useful integration candidate when a project needs the Azure DevOps basic components of a REST API request/response pair 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.
Base
Development
Base is an API listed in the Development category that provides access to building quick backends. It is intended for developers who want to integrate this type of development 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 Base a useful integration candidate when a project needs building quick backends 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.
Beeceptor
Development
Beeceptor is an API listed in the Development category that provides access to build a mock Rest API endpoint in seconds. It is intended for developers who want to integrate this type of development 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 Beeceptor a useful integration candidate when a project needs build a mock Rest API endpoint in seconds 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.
Bitbucket
Development
Bitbucket is an API listed in the Development category that provides access to bitbucket API. It is intended for developers who want to integrate this type of development 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 Bitbucket a useful integration candidate when a project needs bitbucket API 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.
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.