The base rate in Sympl is essentially a back-up rate for your rentals' gap periods when there are no rates assigned. This would ensure that a rate would still be pushed to the channel when the standard rate(s) are lacking for different gaps throughout the calendar year.
Add a Base Rate
The base rate is a fallback rate, which is applied if there are no matching Standard rates for the booking dates. To add a base rate to your rental please do the following:
Navigate to the rental you want to add rates to by clicking on it in the calendar, or from More > Rentals in the top navigation bar.

Click on the rental name which you would like to add a base rate to then on the Rates tab on the left side and select the Settings tap above.

Complete required info and hit Save on the top right.
Rate Fields
Minimum Stay: minimum amount of days guests are allowed to book
Maximum Stay: maximum amount of days that this rental can be booked
Nightly: nightly rate
Weekend Night: Saturday rate and Sunday rate (optional)
Additional Guest Fee: charge x amount for per person per night, above y guests
Guest count: number of guests allowed for this rental before additional fees apply
After you define your base rate settings you will see this rate apply to channels when you have not created a Standard Rate to apply.
Airbnb
The rental base rate found on the Rates Settings tab is not pushed to Airbnb, this must instead be updated in the Airbnb connection Price Settings.
Price Settings for Airbnb is found on the Connection Details page by going to Channels > Airbnb >Click on the connection > Actions > Price Settings:


Price settings are specific to Airbnb listings. Once connected through the API connection, you'll realize that there are settings that are disabled on the channel. Well, they have allowed you to set this through those settings. Prior to connecting, you would've been able to set the base rate.
The base is intended to be used as a fall-through rate, meaning that if a rate does not exist the base is used.
Given that each OTA has different rules and regulations regarding the scope of the base rate we advise to set a standard rate for all dates to avoid any ambiguity that could lead to rate discrepancies.