curl --request POST \
  --url https://tonapi.io/v2/gasless/send \
  --header 'Content-Type: application/json' \
  --data '
{
  "boc": "<string>",
  "wallet_public_key": "<string>"
}
'

{
  "protocol_name": "<string>",
  "external": "<string>"
}

{
  "error": "<string>",
  "error_code": 123,
  "details": {
    "required": 123,
    "available": 123
  }
}