[Archive] How to send USDC token or other tokens on Solana Blockchain? Also, how to get the user's Solana keypair?

[leandrogavidia1234]

Archived Content from Web3Auth Community

This topic was originally posted by leandrogavidia1234 on 4/2/2023.
This content has been migrated from our previous community forum to preserve valuable discussions.

---

Hi everyone! I’m developing a dApp on Solana Blockchain. I want to send USDC token from the user’s address (or some other token).

I’m using the signAndSendTransfer method, bug I can only send SOL. When I try to send USDC I got the next error: internal rpc-error

Also, how to get the user’s keypair? I got the private key, bug I can’t convert it to Uint8Array to get the keypair.

Thanks so much.

I attach my code.

---

import { useAsyncFn, useEffectOnce } from ‘react-use’
import { Connection, LAMPORTS_PER_SOL, PublicKey, SystemProgram, Transaction } from ‘@solana/web3.js’
import { chainConfig } from ‘~/config/chain’
import { useAuth } from ‘~/hooks/use-auth’
import { getAssociatedTokenAddress, getAccount, createTransferInstruction } from “@solana/spl-token”;
import { useGlobalContext } from ‘~/context/global’
import { SolanaWallet } from “@web3auth/solana-provider”

const { session } = useAuth()
const { web3auth } = useGlobalContext()
const userAddress = session?.user.address
const usdcMintAccount = "4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU"
const devnetRpc = "https://api.devnet.solana.com"
const solanaWallet = web3auth?.provider && new SolanaWallet(web3auth?.provider)
const transferUsdc = async () => {

try {

if (!userAddress || !solanaWallet) return;

const connection = new Connection(“https://api.devnet.solana.com”)

const block = await connection.getLatestBlockhash(‘finalized’)

const senderAta = await getAssociatedTokenAddress(new PublicKey(usdcMintAccount), new PublicKey(userAddress))

const receiverAta = await getAssociatedTokenAddress(new PublicKey(usdcMintAccount), new PublicKey(“Fk5wfsBUakaRhwJvP2nsUdDhB55kwVoRYDadmbwWncs6”))

const txInstruction = createTransferInstruction(

senderAta,

receiverAta,

new PublicKey(userAddress),

1

)

const tx = new Transaction({

blockhash: block.blockhash,

lastValidBlockHeight: block.lastValidBlockHeight,

feePayer: new PublicKey(userAddress)

}).add(txInstruction)
    const privateKey: string = await solanaWallet.request({
        method: "solanaPrivateKey"
    })

    const { signature } = await solanaWallet.signAndSendTransaction(tx)
    console.log("USDC TRANSACTION ID(HASH)", signature)
    return signature
} catch (err) {
    console.error(err)
}

}