Mock sample for your project: PowerTools Developer API

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.

The Entity Search API lets you send a search query to Bing and get back search results that include entities and places. Place results include restaurants, hotel, or other local businesses. For places, the query can specify the name of the local business or it can ask for a list (for example, restaurants near me). Entity results include persons, places, or things. Place in this context is tourist attractions, states, countries, etc.

Render Javascript driven pages, while we internally manage Headless Chrome and proxies for you.
Build a custom web scraper with our Visual point-and-click toolkit.
Scrape the most popular Search engines result pages (SERP).
Convert web pages to PDF and capture screenshots.
Authentication
Dataflow Kit API require you to sign up for an API key in order to use the API.
The API key can be found in the DFK Dashboard after free registration.
Pass a secret API Key to all API requests to the server as the api_key query parameter.

This API provides geographic information for a global telephone number, including city and country information, primary languages spoken, and mobile device identification.

A simple HTTP Request & Response Service. Run locally: $ docker run -p 80:80 kennethreitz/httpbin

Catalog Inventory

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.

This is a REST API reference for the Keycloak Admin

Introduction
Api2Pdf is a powerful PDF generation API with no rate limits or file size constraints. Api2Pdf runs on AWS Lambda, a serverless architecture powered by Amazon to scale to millions of requests while being up to 90% cheaper than alternatives. Supports wkhtmltopdf, Headless Chrome, LibreOffice, and PDF Merge. You can also generate barcodes with ZXING (Zebra Crossing).
SDKs & Client Libraries
We've made a number of open source libraries available for the API
Python: https://github.com/api2pdf/api2pdf.python
.NET: https://github.com/api2pdf/api2pdf.dotnet
Nodejs: https://github.com/api2pdf/api2pdf.node
PHP: https://github.com/Api2Pdf/api2pdf.php
Ruby: (Coming soon)
Authorization
Create an account at portal.api2pdf.com to get an API key.
Authorize your API calls
GET requests, include apikey=YOUR-API-KEY as a query string parameter
POST requests, add Authorization to your header.
For more advanced usage and settings, see the API specification below.

This API provides a standard for country name for the purposes of standardizing country name data, improving query results, analytics, and data merging.

Domain API (WHOIS, Check, Batch)

JSON storage API