[TON] Calculating Transaction Network Fees

[Ronaldo Guedes]

I'm implementing TON (The Open Network) and using Trust Wallet Core to build TON transactions. However, I noticed that the network fee calculation is missing in the sample code.

Is there a way to get the network fee for TON transactions similar as we can calculate fees using .plan for Bitcoin?
AnySigner.sign(input, CoinType.TON, TheOpenNetwork.SigningOutput.parser())

[Jaime Toca]

Hi @ronaldoguedess

After you sign, you can get "encoded" from SigningOutput and call

/estimateFee from node

https://toncenter.com/api/v2/#/send/estimate_fee_estimateFee_post

[Ronaldo Guedes]

Hi @JaimeToca

So, there is no off-chain soluction to calc this fee like we have in bitcoin?

I tested this api and it provide me it...
Can I considere just this field? "gas_fee": 155200, or should I considere the match of in_fwd_fee + storage_fee + gas_fee?

{
  "ok": true,
  "result": {
    "@type": "query.fees",
    "source_fees": {
      "@type": "fees",
      "in_fwd_fee": 926400,
      "storage_fee": 11819211,
      "gas_fee": 155200,
      "fwd_fee": 0
    },
    "destination_fees": [],
    "@extra": "1717772010.2004683:12:0.7120622247973473"
  }
}

[Saintloxx]

[Jaime Toca]

Hi @JaimeToca

So, there is no off-chain soluction to calc this fee like we have in bitcoin?

I tested this api and it provide me it... Can I considere just this field? "gas_fee": 155200, or should I considere the match of in_fwd_fee + storage_fee + gas_fee?

{
  "ok": true,
  "result": {
    "@type": "query.fees",
    "source_fees": {
      "@type": "fees",
      "in_fwd_fee": 926400,
      "storage_fee": 11819211,
      "gas_fee": 155200,
      "fwd_fee": 0
    },
    "destination_fees": [],
    "@extra": "1717772010.2004683:12:0.7120622247973473"
  }
}

Fees = in_fwd_fee + storage_fee + gas_fee + fwd_fee

In BTC you still need the price from the network. Not I am not aware of.

[Ronaldo Guedes]

Hey, is there something wrong with this?

I've successfully broadcasted my transaction, but the gas fee seems completely off.

Here's what the API shows me before and based on my transaction and wallet address:

{
  "ok": true,
  "result": {
    "@type": "query.fees",
    "source_fees": {
      "@type": "fees",
      "in_fwd_fee": 987200,
      "storage_fee": 137,
      "gas_fee": 0,
      "fwd_fee": 0
    },
    "destination_fees": [],
    "@extra": "1718588867.165973:1:0.445657813246111"
  }
}