Returns free headers interval, if it is configured in the runtime.
The caller expects that if his transaction improves best known header
at least by the free_headers_interval`, it will be fee-free.
See [pallet_bridge_grandpa::Config::FreeHeadersInterval] for details.
Returns free headers interval, if it is configured in the runtime. The caller expects that if his transaction improves best known header at least by the free_headers_interval`, it will be fee-free.
See [
pallet_bridge_grandpa::Config::FreeHeadersInterval] for details.