curl --request POST \
  --url https://tonapi.io/v2/tonconnect/stateinit \
  --header 'Content-Type: application/json' \
  --data '
{
  "state_init": "<string>"
}
'

{
  "public_key": "NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE2ODQ3...",
  "address": "0:97146a46acc2654y27947f14c4a4b14273e954f78bc017790b41208b0043200b"
}

{
  "error": "<string>",
  "error_code": 123
}