Mock sample for your project: App Store Connect API

IP2WHOIS is a free tool to allow you to check WHOIS information for a particular domain, such as domain assigned owner contact information, registrar information, registrant information, location and much more.

Apptigent PowerTools Developer Edition is a powerful suite of API endpoints for custom applications running on any stack. Manipulate text, modify collections, format dates and times, convert currency, perform advanced mathematical calculations, shorten URL's, encode strings, convert text to speech, translate content into multiple languages, process images, and more. PowerTools is the ultimate developer toolkit.

The News Search API lets you send a search query to Bing and get back a list of news that are relevant to the search query. This section provides technical details about the query parameters and headers that you use to request news and the JSON response objects that contain them. For examples that show how to make requests, see Searching the web for news.

The Web Search API lets you send a search query to Bing and get back search results that include links to webpages, images, and more.

The Video Search API lets you search on Bing for video that are relevant to the user's search query, for insights about a video or for videos that are trending based on search requests made by others. This section provides technical details about the query parameters and headers that you use to request videos and the JSON response objects that contain them. For examples that show how to make requests, see Searching the Web for Videos.

Appwrite backend as a service cuts up to 70% of the time and costs required for building a modern application. We abstract and simplify common development tasks behind a REST APIs, to help you develop your app in a fast and secure way. For full API documentation and tutorials go to https://appwrite.io/docs

This API provides area code information for a given telephone number.

This documentation describes the Gitea API.

This API retrieves the latest currency exchange rate, against the US Dollar, for the given three-letter international currency code. These currency rates are compiled from many global sources and are updated several times per day.

Airbyte Configuration API
https://airbyte.io.
This API is a collection of HTTP RPC-style methods. While it is not a REST API, those familiar with REST should find the conventions of this API recognizable.
Here are some conventions that this API follows:
All endpoints are http POST methods.
All endpoints accept data via application/json request bodies. The API does not accept any data via query params.
The naming convention for endpoints is: localhost:8000/{VERSION}/{METHODFAMILY}/{METHODNAME} e.g. localhost:8000/v1/connections/create.
For all update methods, the whole object must be passed in, even the fields that did not change.
Change Management:
The major version of the API endpoint can be determined / specified in the URL localhost:8080/v1/connections/create
Minor version bumps will be invisible to the end user. The user cannot specify minor versions in requests.
All backwards incompatible changes will happen in major version bumps. We will not make backwards incompatible changes in minor version bumps. Examples of non-breaking changes (includes but not limited to...):
Adding fields to request or response bodies.
Adding new HTTP endpoints.

Code against the Bitbucket API to automate simple tasks, embed Bitbucket data into your own site, build mobile or desktop apps, or even add custom UI add-ons into Bitbucket itself using the Connect framework.

Domain API (WHOIS, Check, Batch)