@marcelo yeah my idea was to create a mailbox contract, dapp will send messages to that contract (say “your nft has been sold”). Near social will check that mailbox and automatically notify user. Another approach is to introduce a parameter ‘receiver_accoound_id’ and ‘message’ so near.social will be able just to scan all indexer transactions and ping corresponding users. Those messages will be free, but anti-spam system will be needed