endpointy.io's answer:
The simplicity of creating endpoints. No need for complex schema's and type validations. Just name the resource and copy-paste the data object you want.
MockAPI - MockAPI lets users mock up APIs, generate custom data, and perform operations on it using RESTful interface.
Mockoon - Mockoon is the easiest and quickest way to design and run mock REST APIs. No remote deployment, no account required, free and open-source.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
WireMock Cloud - Fast and simple API mocking in the cloud, powered by WireMock.
Mock API Generator - Generate custom data & API to build apps in less than 30s
MockServer - Easy mocking of any system you integrate with via HTTP or HTTPS.