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ERC20

You can execute basic ERC20 methods from the specified wallet.

note

Since it performs calls via bytecode, it does not require the contract implementation and can be called as long as the address is available.

warning
  • It requires connected wallet.
  • It does not work on non-Ethereum compatible networks.
func main() {
	alchemy = gas.NewAlchemy(setting)
	w, _ := wallet.New("<privateKey")
	w.Connect(alchemy.GetProvider())

	// call each method
	w.ERC20.MethodXXX()
}

Read Methods​

You can fetch token metadata and balance information:

See also: Namespace Core (referencing lower-level implementations).

Write Methods​

Transfer & TransferNoWait​

Transfer ERC20 token from wallet. Wait for mined or not.

func main() {
	setting := gas.AlchemySetting{
		ApiKey:  "api-key",
		Network: types.EthMainnet,
	}
	alchemy := gas.NewAlchemy(setting)

	w, _ := wallet.New("<privateKey>")
	w.Connect(alchemy.GetProvider())

	// Create contract instance
	contractAddress := "0x1234567890123456789012345678901234567890"

	// Execute transaction (wait for mined)
	receipt, err := w.ERC20().Transfer(
		context.Background(),
		contractAddress,
		"<toAddress>",
		big.NewInt(100),
		nil,
	)
	if err != nil {
		panic(err)
	}

	fmt.Printf("Transaction hash: %s\n", receipt.TxHash)
	fmt.Printf("Status: %d\n", receipt.Status)

	// Execute transaction (no wait)
	txHash, err := w.ERC20().TransferNoWait(
		contractAddress,
		"<toAddress>",
		big.NewInt(100),
		nil,
	)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Transaction hash: %s\n", txHash)
}

Approve & ApproveNoWait​

Approve a spender to spend tokens on behalf of the connected wallet.

TransferFrom & TransferFromNoWait​

Transfer tokens from another address using a prior allowance.