Top 50 Most Popular APIs (Updated for 2021)

Q: What is an API and How Do They Work?

API stands for Application Programming Interface . API is an interface that allows your application to interact with an external service using a simple set of commands. Learn more about how to use an API .

Q: What is the best API?

According to creativebloq , these are the best 15 APIs out there: Google Maps Google Maps Geocoding API IBM Watson FullContact Twitter Facebook Stormpath Amazon S3 Dropbox Google Apps Stripe Twilio MailChimp SendGrid Slack See more popular APIs here.

Q: What is a public API?

An open API (often referred to as a public API ) is a publicly available application programming interface that provides developers with programmatic access to a proprietary software application or web service. APIs are sets of requirements that govern how one application can communicate and interact with another. Source: Wikipedia

Q: What is an API Marketplace?

The attraction of using a marketplace is one of simplicity . Developers can come to one place for the majority of their needs as an API consumer. This attraction is piqued with added-value features like webhook aggregation (as recently released by RapidAPI ), integrated API onboarding, centralized support, and issue tracking. By using these features developers only need to do one integration across many API providers. Source: NordicAPIs

Table of Contents

But first, What are APIs?
- Related Resources
Quick Links
Most Popular API Integrations
Skyscanner Flight Search
Open Weather Map
API-FOOTBALL
The Cocktail DB
REST Countries v1
Yahoo Finance
Love Calculator
URL Shortener Service
NasaAPI
Numbers
musiXmatch
SYSTRAN.io – Translation and NLP
Chuck Norris
Hearthstone
Currency Exchange
Breaking News
Booking
Free NBA
Deezer
Email Validator
Urban Dictionary
Pokemon Go
Recipe – Food – Nutrition
Investors Exchange (IEX) Trading
Movie Database (IMDB Alternative)
webcams.travel
City Geo-Location Lookup
Temp Mail
uNoGS
WordsAPI
GeoDB Cities
Crime Data
Kajak
Chicken Coop
Joke
OpenAPI 1.2
Text-to-Speech
vin-decoder
Cricket Live Scores
Youtube To Mp3 Download
Web Search
JokeAPI
Genius
Nexmo SMS Messaging API
Currency Converter
TheRundown
BrainShop.AI
Utelly
Flight Data
Crypto Asset Tickers
Most Popular API by Category
Previous Top 50
Summary
FAQ: Frequently Asked Questions
- What is an example of an API?
- How many types of APIs are there?
- What is an API and How Do They Work?
- What is the difference between API and Web Service?
- What is the best API?
- What is a public API?
- What is an API Marketplace?
Related API Collections

You may be asking yourself:

“What is the most popular and top used APIs out there?”

Well, ask no more.

RapidAPI has got you covered with a full list of APIs.

With over 400 billion API calls per month, we analyzed the data to see which APIs were the most popular, starting with the top 50.

If you’re looking for the APIs to integrate into your website, software application, or mobile apps, this is the place for you.

But first, What are APIs?

API stands for Application Programming Interface and allows your application to interact with an external service using a simple set of commands. APIs are another way companies can serve their tools and services. Learn how to use an API here.

Related Resources

Quick Links

Most Popular APIs by Category
API Collections
Previous Top 50
How to Use RapidAPI [Video]
How to add an API to RapidAPI [Video]

Most Popular API Integrations

Out of all 10,000+ APIs on RapidAPI’s API marketplace, these are the APIs that over 1,000,000 developers use the most. For each API, click the link to explore the API documentation, or click “Learn More” to read more details about the API.

Skyscanner Flight Search – Learn More
Open Weather Map – Learn More
API-FOOTBALL – Learn More
The Cocktail DB – Learn More
REST Countries v1 – Learn More
Yahoo Finance – Learn More
Love Calculator – Learn More
URL Shortener Service – Learn More
NasaAPI – Learn More
Numbers – Learn More
musiXmatch – Learn More
SYSTRAN.io – Translation and NLP – Learn More
Chuck Norris – Learn More
Hearthstone – Learn More
Currency Exchange – Learn More
Breaking News – Learn More
Booking – Learn More
Free NBA – Learn More
Deezer – Learn More
Email Validator – Learn More
Urban Dictionary – Learn More
Pokemon Go – Learn More
Recipe – Food – Nutrition – Learn More
Investors Exchange (IEX) Trading – Learn More
Movie Database (IMDB Alternative) – Learn More
webcams.travel – Learn More
City Geo-Location Lookup – Learn More
Temp Mail – Learn More
uNoGS – Learn More
WordsAPI – Learn More
GeoDB Cities – Learn More
Crime Data – Learn More
Kajak – Learn More
Chicken Coop – Learn More
Joke – Learn More
OpenAPI 1.2 – Learn More
Text-to-Speech – Learn More
vin-decoder – Learn More
Cricket Live Scores – Learn More
Youtube To Mp3 Download – Learn More
Web Search – Learn More
JokeAPI – Learn More
Genius – Learn More
Nexmo SMS Messaging API – Learn More
Currency Converter – Learn More
TheRundown – Learn More
BrainShop.AI – Learn More
Utelly – Learn More
Flight Data – Learn More
Crypto Asset Tickers – Learn More

Skyscanner Flight Search

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Starting with the most popular API, is Skyscanner.

Now that the Google Flights API is deprecated, many developers are looking to Skyscanner as an alternative.

What is Skyscanner?

Like Google Flights, Skyscanner is a metasearch engine that provides travel data for flights, hotels, car rentals and more. Skyscanner aggregates travel and flight data so you don’t have to go to multiple sites yourself to check each individual flight plan or price.

The Skyscanner API allows you to access this aggregated travel data to retrieve the cheapest flight dates and quotes, browse flight routes, and much more.

Skyscanner API Endpoints

Here’s the list of all the available Skyscanner API endpoints:

Browse Dates – Retrieve the cheapest dates for a given route from our cache.
Browse Quotes – Retrieve the cheapest quotes from our cache prices.
Browse Routes – Retrieve the cheapest routes from our cache prices. Similar to the Browse Quotes API but
with the routes built for you from the individual quotes.
Create session – Create a flight search session. A successful response contains no content. The URL to
poll the results are provided in the Location header of the response.
Currencies – Retrieve the currencies that we support.
List Places – Get a list of places that match a query string.
List markets – Retrieve the market countries that we support. Most suppliers (airlines, travel agents and
car hire dealers) set their fares based on the market (or country of purchase). It is, therefore, necessary to specify the
market country in every query.
Poll session results – Get itineraries from a created session
To Skyscanner

How much is the Skyscanner API?

The Skyscanner API is free to use on RapidAPI.com with a registered account. Sign up for a free account today!

Related: Browse more Travel/Flights and Booking APIs

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Open Weather Map

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OpenWeatherMap is an online service that provides weather data including forecasts and historical data. Their API provides access to weather maps and forecasts for multiple cities across the world.

Open Weather Map API Endpoints

Current Weather Data – Using this kind of requests you can get weather data in any location on the earth. The current weather data are updated online based on data from more than 40,000 weather stations.
Daily Forecast Weather Data – You can get the weather forecast for 14 days. All weather data can be obtained in JSON or XML format.
Forecast Weather Data – You can receive weather forecast in any location on the earth. The flexible algorithm of weather calculation let us provide weather data not only for cities but for any geographic coordinates. It is important for megapolices, for example, where the weather is different on opposite city edges. You can get forecast data every 3 hours or daily. The 3 hours forecast is available for 5 days. Daily forecast is available for 14 days. All weather data can be obtained in JSON or XML format.
Search Weather Data – By city name. Put the city name or its part and get the list of the most proper cities in the world. Example – Lon or Lond or London. The more precise city name you put the more precise list you will get. To make it more precise put the city’s name or its part, comma, the name of the county or 2-letter country code. You will get all proper cities in the chosen county. The order is important – the first is city name then comma then the county. Example – Lon, UK or Lon, GB or London, GB or Lon, England. By geographic coordinates.

Related: Top Weather APIs

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API-FOOTBALL

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The API-Football API is the most popular RESTful API for football (soccer) data. It covers over 300 major and minor football leagues. Get live scores, pre-match odds, events, line-ups, standings, stats, and much more.

API-Football Pricing

The API has 3 pricing tiers:

Free – $0/month – 50 Requests/day
Pro – $19/month – 7,500 Requests/day
Ultra – $29/month – 75,000 Requests/day
Mega – $39/month – 150,000 Requests/day

Related: Check out the best football and soccer APIs

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The Cocktail DB

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TheCocktailDB is a free API that provides a crowd-sourced database of beverages and cocktails from around the world. The API is free to use for non-commercial purposes. The API allows you to search for cocktails by:

Categories
Glasses-type (example: flute vs standard cocktail glass)
Ingredients
Alcoholic-type (Alcoholic vs non-alcoholic)

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REST Countries v1

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REST Countries is a simple RESTful API that provides data about the world’s countries. This API was recently acquired by apilayer and will be continued served as a free API for developers.

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Yahoo Finance

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Yahoo Finance is a property of Yahoo that provides financial news & data as well as online tools for personal finance management. It’s one of the more popular media properties for financial stock data.

Yahoo Finance API Endpoints

Here’s a list of the Yahoo Finance API endpoints and how to use them:

Get Summary – This endpoint allows you to get the real-time live market summary information in a specific region at that given time.
Get Movers – This endpoint retrieves the day’s gainers, losers, and actives within a given region.
Get Quotes – This API Endpoint returns all relevant information for a specific stock quote or groups of stock quotes specified by symbol.
Get Charts – This API endpoint returns data that allows you to visualize a chart for a specific symbol and its comparisons. The data includes trading periods, timestamps, comparisons, and more to help draw out charts.

Related: Google Finance API and its alternatives

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Love Calculator

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Learn the compatibility between you and the name of your crush using the love calculator API. Simply insert your name and your partner/love/crush’s name and the API calculates the percentage and compatibility result between you two.

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URL Shortener Service

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The URL Shortener Service API is a simple API that converts URLs to short links. It’s completely free to use. Just paste a link to cut it!

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NasaAPI

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The Nasa API is an API that queries Nasa’s database and returns statistics about:

Asteroid Stats
Closest Asteroids
Earth Imagery
Pictures of Asteroids
Mars Rover Photos
and more

Related How to use the Nasa API

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Numbers

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An API for interesting facts about numbers. Provides trivia, math, date, and year facts about numbers.

Numbers API Endpoints include:

Get date fact
Get math fact
Get random fact
Get trivia fact
Get year fact

Related: Math APIs

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musiXmatch

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MusiXmatch is the world’s largest lyrics database with over 50 million active users and over 14 million lyrics. The musiXmatch API grants developers access to this music, album and lyrics data.

musiXmatch API Endpoints

Here are some examples of musiXmatch API endpoints:

Album – Get the album object
Album.tracks – Get the list of song within an album
Artist – Get the artist object
Artist.related
Artist.search
Matcher.lyrics – Get the lyrics for a song starting by title and artist
Matcher.subtitle.get
Matcher.track – Starting from your track title and artist name, find our correspondent track
Track – Get a track from musixmatch

Related: Top Music and Audio APIs

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SYSTRAN.io – Translation and NLP

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The SYSTRAN Platform enables you to utilize and analyze both structured and unstructured multilingual content, such as user-generated content, social media, web content and more. Easy to use, scalable and reliable, the new SYSTRAN Platform brings the power of SYSTRAN’s best-of-breed language processing technologies to your apps and websites. Learn more about SYSTRAN’s APIs.

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Chuck Norris

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The Chuck Norris API is a hilarious API that provides random jokes and memes about the great American hero.

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Hearthstone

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Hearthstone is a free-to-play online digital collectible card game developed and published by Blizzard Entertainment. The Hearthstone API is a free RESTful API that allows developers to access all Hearthstone card data such as card sets, classes, races, quality, types, factions, and more.

List of Hearthstone API Endpoints

Info – Returns a list of current patch, classes, sets, types, factions, qualities, races and locales.
All Cards – Returns all available Hearthstone cards including non collectible cards.
Single Card – Returns card by name or ID. This may return more then one card if they share the same name. Loatheb returns both the card and the boss.
Card Set – Returns all cards in a set. Example values: Blackrock Mountain, Classic.
Cards by Class – Returns all cards in a set. Example values: Blackrock Mountain, Classic.
Cards by Race – Returns all the cards of a certain race. Example values: Mech, Murloc.
Cards by Quality – Returns all the cards of a certain quality. Example values: Legendary, Common.
Cards by Type – Returns all the cards of a certain type. Example values: Spell, Weapon.
Cards by Faction – Returns all the cards of a certain faction. Example values: Horde, Neutral.
Card Search – Returns cards by partial name.
Card Backs – Returns a list of all the card backs.

Related: List of Free APIs

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Currency Exchange

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The Currency Exchange API gets live currency exchange rates for currencies and foreign exchange rates around the world.

List of Endpoints:

exchange – Get Currency Exchange by specifying the quotes of the source (from) and destination (to), and optionally the source amount to calculate which to get the destination amount, by default the source amount will be 1.
listquotes – List the available quotes in JSON Array this API support, all the available quotes can be used in source and destination quote. Refer exchange endpoint for more information on how to call the currency exchange from the source quote to destination quote.

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Breaking News

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The Breaking News API (created by MyAllies) is a free RESTful API that provides financial news data such as real-time news feeds, company news (about a specific company), and company details (by company ticker symbol).

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Booking

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The unofficial Booking.com API lets you query information such as available rooms, prices, facilities, policies, hotel reviews, and more from the Booking.com website.

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Free NBA

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The Free NBA API is a Pro Basketball API that provides historical data for any game, team, or player.

Related: NBA Basketball Stats API

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Deezer

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The Deezer API allows developers access into Deezer’s massive music database of over 30 million tracks and playlists.

Endpoints include:

Search
Album
Comment
Genre
Artist
Editorial
Playlist
Track
Radio
Infos

Related: Top Free Music APIs

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Email Validator

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The Email Validator API checks for fake DNS as well as use regex functions to check email addresses for the right length and accepted characters. For example it will mark as valid an email like ‘john@gmail.com’ but it will recognize as a fake ‘[email protected]’ (because of the not existing domain)

Related: Best Email APIs

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Urban Dictionary

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Urban Dictionary is an online dictionary that provides definitions for slang words and phrases, based on the crowdsourced information.

There is an unofficial API for Urban Dictionary that accesses their database of definitions and examples.

Dictionary APIs

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Pokemon Go

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The Pokemon Go API is a free public API that provides data about all the various data and statistics about this popular game.Stats such as:

Candies required to evolve
Buddy Distances
Raid Pokemon
Nesting Pokemon
Maximum CP
Shiny Pokemon
Alolan Pokemon
Fast moves
Names
Charged Moves
Released Pokemon
and much more!

Category: Gaming APIs

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Recipe – Food – Nutrition

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The Spoonacular API is the ultimate Recipe, Food and Nutrition database all rolled up into a single API, making it “the only Food API you’ll ever need.”

With Spoonacular, you’ll get access to over 365,000 recipes and 86,000 food products.

Their API has a unique food ontology that allows them to build semantic relationships between ingredients, recipes, and store products.

If you’re building a food-related website or app, Spoonacular API is a must.

Spoonacular API Endpoints

Here is a list of some of the available Spoonacular API endpoints:

Analyze Recipe Instructions – Extract ingredients and equipment from the recipe instruction steps.
Analyze a Recipe Search Query – Parse a recipe search query to find out its intention.
Autocomplete Ingredient Search – Autocomplete a search for an ingredient.
Autocomplete Recipe Search – Autocomplete a partial input to possible recipe names.
Classify Cuisine – Classify the recipe’s cuisine.
Classify Grocery Products (Batch) – Given a set of product jsons, get back classified products.
Classify a Grocery Product – Given a grocery product title, this endpoint allows you to detect what basic
ingredient it is.
Convert Amounts – Convert amounts like “2 cups of flour to grams”.
Create Recipe Card – Create a recipe card given a recipe.

Spoonacular API Pricing

The Spoonacular API is free up to the first 50 daily API calls. Following that, it is $0.007 per additional call.

There are also a few paid tiers available (Pro, Ultra, & Mega) for heavier users of the API ranging from $29 to $999/month.

Related: Check out the top Restaurants and Food APIs

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Investors Exchange (IEX) Trading

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The Investors Exchange Trading API is a free, web-based API that supplies IEX quoting and trading data.

Related: Best Stock Market & Brokerage APIs

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Movie Database (IMDB Alternative)

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The Movie Database API the perfect solution if you’re a developer in need of an API to retrieve IMDb data.

The Movie Database API has two GET endpoints:

Search
ID or Title

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webcams.travel

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Webcams.travel gathers webcams from around the world and make them accessible to any developers via their API. Using the webcams.travel API, you can enrich your website or app with free webcam content from over 69,687 webcams around the world.

webcams.travel API Endpoints

/webcams/list/bbox={ne_lat},{ne_lng},{sw_lat},{sw_lng} – This is a modifier. Returns a list of the webcams in the bounding box given by north-east ({ne_lat},{ne_lng}) and south-west ({sw_lat},{sw_lng}) coordinates. Required: {ne_lat},{ne_lng},{sw_lat},{sw_lng}.
/webcams/list/category={category}[,{category}[,…]] – This is a modifier. Returns a list of webcams according to the listed categories. Multiple categories must be separated by comma. Required: at least one {category}.
/webcams/list/continent={continent}[,{continent}[,…]] – This is a modifier. Returns a list of webcams according to the listed continents. Multiple continents must be separated by comma. Required: at least one {continent}.
/webcams/list/country={country}[,{country}[,…]] – This is a modifier. Returns a list of webcams according to the listed country. Multiple countries must be separated by comma. Required: at least one {country}. Possible values are ISO 3166-1-alpha-2 codes.
/webcams/list/exclude={webcamid}[,{webcamid}[,…]] – This is a modifier. Exclude the {webcamid} from a list. Multiple {webcamid} must be separated by comma. Required: at least one {webcamid}
/webcams/list/limit={limit},{offset} – This is a modifier. Returns the list of webcams sliced by {limit}. The optional offset is given by {offset}. Required: {limit}. The maximum value for {limit} is 50. {offset} defaults to 0. If limit is not given, then a default of limit=10 is applied.
/webcams/list/nearby={lat},{lng},{radius} – This is a modifier. Returns a list of webcams near the given coordinates {lat},{lng} up to the given {radius} in kilometers. Required: {lat}, {lng}, {radius}. The maximum value for {radius} is 250.
/webcams/list/orderby={order},{sort} – This is a modifier. Returns the list of webcams ordered by {order}. The optional sorting direction is given by {sort}. Required {order}.
/webcams/list/property={property}[,{property}[,…]] – This is a modifier. Returns a list of webcams according to the listed {property}. Multiple {property} must be separated by comma. Required: at least one {property}. Possible values are “editors” (featured from the editors), “hd” (high resolution webcams), and “live” (webcams with a live stream).

webcams.travel API Pricing

The webcams.travel API allows you to get quality & maintained content, a timelapse player for free via the RapidAPI interface.

Related: Webcam APIs

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City Geo-Location Lookup

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The City Geo-Location Lookup API provides Latitude, Longitude Coordinates as well as Time-Zone of any city.

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Temp Mail

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The Temp Mail API is exactly as the name suggests:
A Disposable Temporary E-mail service which self-destructs after a certain time elapses.
It is also known by names like:

tempmail
10minutemail
throwaway email
fake-mail
or trash-mail.

This API helps you avoid spam and stay safe.

Learn how to create a disposable email address here.

Temp Mail API Endpoints

Delete message – Delete message, where md5 unique identifier assigned by the system.
Domains list – Get domains list
Get emails – Check and get a list of emails for a mailbox
Get message attachments – Get message attachments by message id
Get one message – Get one message by id
Source message – Get message source by id

Related: Best E-Mail APIs for Developers

The Temp Mail API is free to use up to 100 daily requests. There are also some paid pricing plans for increased usage.

Related How to Validate Email Addresses in Google Sheets with zero Bounce API

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uNoGS

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uNoGS stands for unofficial Netflix online Global Search. Netflix does not have a public API, but the uNoGS API is an unofficial Netflix API that provides sufficient data.

The API has 3 major groups:

- Country – Search and list titles/releases by country and geo
- Search – Perform searches for movies or TV shows
- Title Information – Get details for a specific movie or TV show

Related: Alternatives to the Netflix API

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WordsAPI

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The Words API is “an API for the English Language” that has a wide array of functions such as extracting word definitions or synonyms, retrieving word or phrase example usage, getting rhyming words, and much more.

For a little preview, head on over to their Try It section on the Words API homepage.

Words API Endpoints

Here is a list of a few of the available Words API endpoints:

Also – Phrases of which the word is a part.
Antonyms – Get antonyms (opposites) of a word.
Definitions – Get definitions of a word, including the part of speech.
Entails – – Words that are implied by the original word. Usually used for verbs.
Examples – Get examples of how the word is used.
Frequency – – Expands upon the frequency score returned by the main /words/{word} endpoint. Returns zipf, a score
indicating how common the word is in the English language, with a range of 1 to 7; per million, the number of times the word
is likely to appear in a corpus of one million English words; and diversity, a 0-1 scale the shows the likelihood of the word
appearing in an English document that is part of a corpus. –
Has Categories – Categories of the parameter word.
Has Instances – Words that are examples of the parameter word.
Has Members – Words that belong to the group defined by the parameter word.

Words API Pricing

The Words API is free up to 2,500 daily API calls. After the first 2,500, it costs $0.004 per additional API call.

There is also a Pro, Ultra, and Mega pricing plan available for heavier usage starting at $10, $49, and $89 per month respectively.

Learn more about the Types of APIs

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GeoDB Cities

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GeoDB is an online cities database. It exposes city, region, and country data via a REST JSON API.

GEODB Cities API Endpoints

Cities – Find cities, filtering by optional criteria. If no criteria are set, you will get back all known cities with a population of at least 1000.
Cities Near City – Get cities near the given city, filtering by optional criteria.
Cities Near Location – Get cities near the given location, filtering by optional criteria.
City Date-Time – Get the city current date-time in ISO-6801 format: yyyyMMdd’T’HHmmssZ
City Details – Get the details for a specific city, including location coordinates, population, and elevation above sea-level (if available).
City Distance – Gets the distance to the given city.
City Time – Get the city current time in ISO-8601 format: HHmmss.SSSZ
Countries – Find countries, filtering by optional criteria. If no criteria are set, you will get back all known countries.
Country Details – Get the details for a specific country, including number of regions.

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Crime Data

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The Crime Data API is a simple database that provides crime alerts for a specific location (using lat/long coordinates) for a specific date range.

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Kajak

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The Kajak (much like Kayak) API is an API to query real-time flight prices, hotel prices, and car rental prices.

Top Hotel APIs

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Chicken Coop

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Chicken Coop is an unofficial Metacritic API that provides metacritic details about a specific video game and platform.

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Joke

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The Joke API allows developers to submit, retrive and voke for jokes. You can search for random jokes or specific types of jokes.

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OpenAPI 1.2

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The TransLoc OpenAPI is a public RESTful API which allows developers to access real-time vehicle tracking information and incorporate this data into their website or mobile application.

API endpoints include:

Agencies
Arrival Estimates
Routes
Segments
Vehicles
Stops

Related Top Transportation APIs

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Text-to-Speech

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The Voice RSS Text-to-Speech API converts text to an audio file (such as .mp3). You can get an API key from their website.

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vin-decoder

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The vin-decoder API is an API that decodes vehicle identification numbers and provides detailed vehicle history reports. Currently, it’s only available for North America, Asia and Europe. This is the API that powers https://www.vinfreecheck.com/salvage-check and https://www.vinfreecheck.com/vin-decoder.

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Cricket Live Scores

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The Cricket Live Scores API provides sports data for all crciket matches across the world including:

cricket scores
cricket scorecards
test scores
ODI scores
T20 scores
BBL scores
IPL scores
World Cup scores

Cricket Live Scores API Endpoints

# Matches (LIST ALL MATCHES) – Returns a list of matches for any series. The matches can be upcoming, in progress, or completed.
Batting Wheel – Batting Wheel
Commemtary – Get Detailed Commemtary for a given Match
GET Images – Get Images
Graph – This can be used to draw the Manhattan chart, Total Runs chart and Run Rate Chart, re-drawn on a live basis as and when match progresses.
Match By Series ID – Returns a list of matches for a specific series. The matches can be upcoming, in progress, or completed.
Match Live & HighLights – This intended to be used primarily a Live or Completed match highlight view, as it provides the overall current state of a match with a live up- to-the-minute updates and optional media. It does not contain Commentary, Match Players, Ball or other MatchDetail information
Match by Match ID – Gets the detail of a match like scores, teams and venue.
Patnerships – This intended to be used for display of a Partnership graph for a particular innings within a Match.

Related Cricket APIs

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Youtube To Mp3 Download

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The Youtube to Mp3 API does exactly what it says. Convert any youtube video link into a downloadable Mp3 link. The endpoints allow you to do this for single videos or for multiple videos.

Related: Youtube-related APIs

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Web Search

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The Web Search API is a search engine API created by https://contextualwebsearch.com/. It’s a simple search engine API that supposedly mimics the way a human brain indexes memories.

The API can perform:

- autocomplete
- web search
- news search
- and image search

Related: Best Search APIs

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JokeAPI

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JokeAPI is another fun API that provides joke categories, joke details, and jokes!

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Genius

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The Genius API is a song and lyric API that provides search, song details, and artists details.

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Nexmo SMS Messaging API

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The Nexmo SMS API is a powerful text messaging service. With the API, you can:

Automatically send and receive a high volume of SMS.
Build SMS service apps with web technologies.
Send SMS with low latency and high delivery rates.

Learn how to use Nexmo with PHP.

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Currency Converter

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The Currency Converter API is a simple API that provides historical currency rates, available currencies, and converts currency!

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TheRundown

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TheRundown is a website that provides real-time odds from major sportsbooks. The API gives access to their database to give odds on the:

NFL
NBA
MLB
NHL
NCAAF
NCAAB
and more

Sportsbooks include:

5Dimes
Pinnacle
Matchbook
Betcris
Lowvig
TheGreek
Justbet
Tigergaming
Betonline
Bookmaker
Sportsbetting
Intertops

Related: Best Gambling APIs

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BrainShop.AI

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The BrainShop.AI API enables you to create AI brains, which enables your apps or devices to converse with people in a human language. With this API, you could:

Create a chatbot
Create a Virtual Assistant
Create a Virtual Teacher
Add AI to your VR/AR products
Interact with players in your game
and much more.

Connect to BrainShop.AI

Utelly

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Utelly is an API that checks to see where you can watch a movie or TV show.

It searches platforms like:

- Netflix
- Amazon Prime
- Amazon Instant
- iTunes
- Now TV
- TalTalk TV Store
- Google Play
- BBC Iplayer
- All 4
- My 5
- Rakuten TV
- and ITV HUb

Utelly API Pricing

The Utelly API has a freemium pricing model which is free to use up to 1000 API requests per month. After that, it costs $0.01 per additional request.

Related: Top TV APIs

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Flight Data

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The Flight Data API (created by travelpayouts) is a simple API that provides flight trends and popular destinations for your website or application’s users. With the API, you can query:

non-stop tickets
popular directions from a city
tickets for each day of the month
popular airline routes
cheapest tickets
prices for alternative directions
specia offers
and much more.

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Crypto Asset Tickers

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The Crypto Asset Tickets is an API created by BraveNewCoin that provides spot price tickers and currency conversion for over 500 crypto assets.

With the API you can retrive:

Asset Tickers
Currecny Conversions
Crypto Prices
Digital Currency Symbols
and Fiat Currency Symbols

Related: All BraveNewCoin APIs

Connect to Crypto Asset Tickers

Previous Top 50

Summary

And that’s our top 50 most popular APIs for the month of September. Come back next periodically and we’ll reveal the updated list.

If you were looking for the previous list (Most Popular 2018), you can find it here.

Do you have any API that you’d like to add to the RapidAPI API Marketplace? Add Your API today!

Is there any API you’d like to see added to the marketplace? Request it.

To find more lists of API, make sure to browse the blog.

FAQ: Frequently Asked Questions

What is an example of an API?

APIs as a way to serve your customers. You’ve probably heard of companies packaging APIs as products. For example, Weather Underground sells access to its weather data API. Example scenario: Your small business’s website has a form used to sign clients up for appointments.

Source: Free Code Camp

How many types of APIs are there?

There are four main types of APIs:

Open APIs
Partner APIs
Internal APIs
Composite APIs

Apart from main web APIs, there are also web service APIs:

SOAP
XML-RPC
JSON-RPC
REST

What is an API and How Do They Work?

API stands for Application Programming Interface. API is an interface that allows your application to interact with an external service using a simple set of commands.

Learn more about how to use an API.

What is the difference between API and Web Service?

A web service allows a program or application to communicate with a web page. Some people call a web service an “application service,” which basically serves as the middleman between the computer and a browser.

An API, or application programming interface, is considered a web service that allows communication between two programs on a server that receives requests and sends responses.

Learn more about APIs vs web services.

What is the best API?

According to creativebloq, these are the best 15 APIs out there:

See more popular APIs here.

What is a public API?

An open API (often referred to as a public API) is a publicly available application programming interface that provides developers with programmatic access to a proprietary software application or web service. APIs are sets of requirements that govern how one application can communicate and interact with another.

Source: Wikipedia

What is an API Marketplace?

The attraction of using a marketplace is one of simplicity. Developers can come to one place for the majority of their needs as an API consumer. This attraction is piqued with added-value features like webhook aggregation (as recently released by RapidAPI), integrated API onboarding, centralized support, and issue tracking. By using these features developers only need to do one integration across many API providers.

Source: NordicAPIs