Don’t know what “API” means? Click here to learn.
Say, “Hi” to the new API of LetMeGo: The Merrcury API! The Merrcury API allows any application to update and fetch the rates and/or availability of listings in LetMeGo.
If you are a host and you are already setting your rates and/or availability in another website or application, you can ask them to connect to the Merrcury API, so that your rates and/or availability get automatically updated in LetMeGo. To find out if the application you use is already connected to the Merrcury API, click here.
If you are a software developer, you can start using our API right away by joining the Merrcury Developer Community. We will tell all of our hosts about your app when you have it ready.
Alexander is LetMeGo's co-founder and jefe. Here is his LetMeGo 
These systems are brilliant but I don’t see RMS on the list unfortunately.