Question 1

Which is better, Account and Transaction API Specification - UK or SmartAPI?

Accepted Answer

If you need a Finance API that's easy to integrate, go with SmartAPI. Account and Transaction API Specification - UK uses apiKey while SmartAPI uses apiKey.

Question 2

What is the main difference between Account and Transaction API Specification - UK and SmartAPI?

Accepted Answer

Account and Transaction API Specification - UK: ## Functionality at a glance

The NBG "UK OPB - Account and Transaction v3.1.5" API follows the [UK Open Banking Specification
    v3.1.5](https://openbankinguk.github.io/read-write-api-site3/v3.... SmartAPI: Gain access to set of  <SmartAPI>  and create end-to-end broking services. They differ in authentication (apiKey vs apiKey), HTTPS support (yes vs yes), and CORS (unknown vs unknown).

Question 3

Which Finance API is easier to integrate?

Accepted Answer

Both have similar integration complexity. Account and Transaction API Specification - UK uses apiKey and SmartAPI uses apiKey.

Account and Transaction API Specification - UK vs SmartAPI

Account and Transaction API Specification - UK

SmartAPI

When to use which?