If your startup is planning to build an app, you’re going to need an Application Programming Interface, better known as an “API.” The role of an API is to give your app a set of directions so it can get all the information it needs to interact with your business. APIs are extremely valuable, but they can also be difficult to navigate. Here’s a look at the 10 best APIs for start-ups that will ensure your business has the fundamental technology needed to be successful in 2023.

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#1 REST Countries

Perhaps one of the most simple, practical, and popular APIs out there, REST Countries is a RESTful API that allows you to tap into endless information about the world’s countries. This API was recently acquired by apilayer but they plan to continue offering REST Countries for free while they fully fund the development of the API, putting an end to donation requests.

#2 Yahoo! Finance

Yahoo! Finance offers financial data, news, and relevant tools and is an essential inclusion in any list of best APIs for start-ups. The associated API endpoints can be very useful for start-ups and include:

  • Get Summary: Use this endpoint to generate a real-time summary of the market as things change, with information specific to the region you choose.
  • Get Movers: Use this endpoint to retrieve information for a given region pertaining to the gainers, losers, and actives for the day. 
  • Get Quotes: Use this endpoint to retrieve information for a specific group of stocks or single stock by specifying its symbol.
  • Get Charts: Use this endpoint to retrieve data you can use to visualize the chart and comparisons for a given stock. The data will include timestamps, trading periods, and other critical information. 

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#3 URL Shortener Service

The simple API offered by the URL Shortener Service is straightforward, but it has a million potential applications. Paste in a link, and a shorter version will pop out. There are no limits to the number of links you can shorten, with the only limit imposed being only three concurrent calls per second. Links never die, either.

#4 MusiXmatch 

The largest database of lyrics in the world, MusiXmatch serves over 50 million active users with lyrics to over 14 million songs. The API endpoints give you complete access to the album and lyrics data. EnThe largest lyrics library in the world, MusiXmatch, provides lyrics to more than 14 million songs to its over 50 million active users. You have full access to the album and lyrics data using the API endpoints. Endpoints give you access to information such as song lists within albums, artist and album information, related artists, song lyrics matching, and more. Deezer is a comparable but less popular substitute.

#5 Numbers API

Use the Numbers API to get facts about math, data, and numbers in addition to trivia. You can use various endpoints to get a date fact, year fact, math fact, trivia fact, or random fact. 

Wondering how you can keep your various APIs organized? DreamFactory can help! Learn more about the benefits of partnering with DreamFactory.


With SYSTRAN, you can analyze a multitude of structured and unstructured data, even across multiple languages. SYSTRAN is particularly powerful when you need to analyze social media posts, web content, user-generated content, and other diverse forms of data. It’s scalable, reliable, and easy to use. 

#7 Currency Exchange

Using the Currency Exchange API, you can get exchange rates in real-time for currencies around the world. Endpoints include the ability to get a quote by specifying a source and destination, along with an optional amount. You can also list available quotes using another endpoint. 

#8 Email Validator 

With the Email Validator API, you’ll be able to clean your email lists and help reduce fraud by checking for fake DNS along with regex functions to check for length and accepted characters. For example, “[email protected]” would often be mis-marked as a valid email, but this API will recognize it as fake because the domain doesn’t exist. Given the extent to which email capture is part of many start-up sales and marketing processes, an email validator should be part of any thinking around best APIs for start-ups.

#9 City Geo-Location Lookup

Another simplistically beautiful API, the City Geo-Location Lookup enables you to find the Latitude and Longitude of any city along with its Time-Zone. Ideal for applications that require mapping and geotagging or feature location-specific listings, like business or user profiles.

#10 Words API

The Words API is often called the “API for English” as it offers a number of functions, giving you the ability to extract definitions and synonyms, retrieve examples of a word/phrase in use, find rhyming words, and more. 

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API Management With DreamFactory

So what do the best APIs for start-ups have in common? Ultimately, these APIs offer some incredibly versatile functionality, the question is: How can your startup utilize such APIs in a manner that’s sustainable, scalable, and meaningful? Don’t let your API assets go to waste due to a bad API strategy. Let DreamFactory show you how effortless API management can be. Schedule a free trial today!

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