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Approve

Approve a spender to spend ERC20 tokens on behalf of the connected wallet.

warning

It requires connected wallet.

Approve​

Wait for the transaction to be mined and return the receipt.

func Approve(ctx context.Context, contractAddress, spenderAddress string, amount *big.Int, gasLimit *uint64) (*types.Receipt, error)
func main() {
	// ... setup ...

	receipt, err := w.ERC20().Approve(
		context.Background(),
		"<contractAddress>",
		"<spenderAddress>",
		big.NewInt(100),
		nil, // use default gas limit (300000)
	)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Transaction hash: %s\n", receipt.TxHash)
	fmt.Printf("Status: %d\n", receipt.Status)
}

ApproveNoWait​

Send the transaction without waiting for it to be mined. Returns the transaction hash immediately.

func ApproveNoWait(contractAddress, spenderAddress string, amount *big.Int, gasLimit *uint64) (common.Hash, error)
func main() {
	// ... setup ...

	txHash, err := w.ERC20().ApproveNoWait(
		"<contractAddress>",
		"<spenderAddress>",
		big.NewInt(100),
		nil,
	)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Transaction hash: %s\n", txHash)
}