Top Picks for Best SEO APIs

List of SEO (and SEM) related APIs to help with keyword research, tracking SERP changes, and spying on your competitors.

About this Collection:


About SEO APIs

Get top keyword suggestions, search volume, relevance scores, and real-time SERPs with SEO APIs.

What is an SEO API?

A search engine optimization (SEO) application programming interface (API) consists of code that allows users to retrieve data about the most relevant keywords and keyword phrases that appear in Search Engine Results Pages (SERPs). The retrieved data is determined on the relevance to the keyword or keyword phrase inputted by the user.

How does an SEO API work exactly?

An API for SEO uses the GET method to retrieve data and the POST method to put the response in a structured format, such as JSON.

Who is an SEO API for?

Developers who want to save time coding SEO functionality into their applications will find the API for SEO helpful

Businesses that provide marketing services will also find APIs for SEO useful for launching campaigns to improve the online search rankings of their clients’ websites.

Why is an API for SEO important?

APIs for SEO are important tools because they help improve web page performance, brand visibility, and page rankings. In addition to keyword data, developers and other API users may receive information about average page views, URL identifications, domain scores, traffic rankings, and top organic competitors.

What you can expect from SEO APIs?

Developers can expect to spend less time coding SEO features into their applications. This is because APIs automatically interact with multiple websites to gather the requested data.

Other API users and businesses can expect to increase their rankings when they use APIs for SEO. In all digital industries, better keyword selections and content improvements helpmoutrank a competitor’s online presence.

Are there examples of free SEO APIs?

RapidAPI’s Marketplace lists many freemium APIs for SEO. A popular SEO and Search Engine Marketing (SEM) API is Keyword Suggestion by Twinword. The provider has a demo showing average monthly searches, SEO competition, keyword score, and relevance. Its Basic free SEO API plan has a limit of 10 requests per month and charges five cents per extra request over the quota. The next tier level is the Pro plan. Users pay only $25 per month with a quota of 2,000 monthly requests. The per-request rate over the quota for that plan is five cents.

Another free SEO API is Zenserp by Christoph Leitner. It’s an API that scrapes (retrieves the top SERPs) in real-time. Its Basic plan has a hard limit of 50 requests per month.

Best SEO APIs for Developers

Use this collection of APIs to help with keyword research, tracking SERP changes, and other SEO related tasks. APIs in the collection include:


All SEO APIs are supported and made available in multiple developer programming languages and SDKs including:

  1. Node.js
  2. PHP
  3. Python
  4. Ruby
  5. Objective-C
  6. Java (Android)
  7. C# (.NET)
  8. cURL

Just select your preference from any API endpoints page.

Sign up today for free on RapidAPI to begin using SEO APIs!