Mikrotik RouterOS DDNS update script for Namecheap domains

update.rsc

:global currentPublicIP

:local host "" # Add your subdomain here
:local domain "" # Add your domain here
:local password "" # Add your access token here
:local ddnsInterface "pppoe-out1"
:local newPublicIP [/ip address get [find interface="$ddnsInterface"] address]
:local unmaskedIP [:pick "$newPublicIP" 0 [:find "$newPublicIP" "/"]]
:local namecheapUpdateURL "https://dynamicdns.park-your-domain.com/update?host=$host&domain=$domain&password=$password&ip=$unmaskedIP"

:if ( $currentPublicIP = nil || ( $newPublicIP != $currentPublicIP ) ) do= {
  :if ( $currentPublicIP = nil ) do= {
    /log info "DDNS: Previous public IP not set. Updating DDNS to $newPublicIP."
  } else={
    /log info "DDNS: Updating record from $currentPublicIP to $newPublicIP"
  }
  :global currentPublicIP "$newPublicIP"
  :set currentPublicIP "$newPublicIP"
  /tool fetch url=$namecheapUpdateURL mode=https keep-result=no
} else={
  /log info "DDNS: Public IP has not changed. Not updating."
}