How to estimate transaction fee without initializing a signer in taquito?

Question

I am trying to estimate the fees for a transaction call using the Tezos.estimate.transfer() function but it is asking to initialize a signer. Is it possible to make an estimate call without a signer or private key?

Answer 1

I guess the below code will help you.

const TezosToolkit = require('@taquito/taquito').TezosToolkit;
const tezos = new TezosToolkit("TEZOS NODE RPC URL");
const InMemorySigner = require('@taquito/signer').InMemorySigner;

const estimateTxn = async function(input){
    tezos.setProvider({ signer: new InMemorySigner(input.senderPrivateKey) });
    const estimated = await tezos.estimate
                .transfer({ to: input.destination, amount: Number(input.amount)/1000000 })
                .then((est) => {
                    const estimated = {
                        "gasLimit"     :   est.gasLimit.toString(),
                        "storageLimit" :   est.storageLimit.toString(),
                        "suggestedFee" :   est.suggestedFeeMutez.toString()
                    }
                    return estimated;
                })
                .catch((error) => {
                    console.log("ERROR: Estimation failed!!",error);
                });
    return estimated;
}

Here the input is:

const input = {
    "destination"       :   "address of receiver",
    "amount"            :   "amount in tez",
    "source"            :   "address of sender",
    "senderPublicKey"   :   "public key of sender",   
    "senderPrivateKey"  :   "private key of sender"
}