Toncenter supports mintless jettons, check on preview.toncenter.com!
Now for jettons that allow mintless claim v3/jetton/wallets API returns additional field:
"mintless_info": {
"amount": "<amount-as-string>",
"start_from": <unix-timestamp>,
"expire_at": <unix-timestamp>
}
How to support mintless jettons in your dapp?
— To show balance with mintless, use
data["balance"] + data["mintless_info"]["amount"]— To autoclaim on transaction, when your dapp asks user to send outgoing jetton transfer via TonConnect, check if
data["mintless_info"] is present and retrieve from mintless jetton claim api custom_payload and init_data to fill them in to transfer. — That's it. Now you support mintless jettons!
P.S. Note that now
code_hash and data_hash fields can be null for not yet deployed jettons wallets.