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ERC20 Signature Mint

import "@thirdweb-dev/contracts/base/ERC20SignatureMint.sol";

The ERC20SignatureMint smart contract adds the signature-based minting extension functionality to the ERC20Base contract.

Signature minting uses EIP-712, which enables the contract admin to authorize an external party's request to mint tokens on the admin's contract. At a high level, this means you can authorize others to mint tokens on your contract, and specify what exactly will be minted by that external party.

Detected Extensions

Once deployed, you can use the features made available by these extensions on the SDK and dashboard:

Click on each feature to learn more about what functions are available.


Import the contract and inherit from it.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@thirdweb-dev/contracts/base/ERC20SignatureMint.sol";

contract MyToken is ERC20SignatureMint {
address _defaultAdmin,
string memory _name,
string memory _symbol,
address _primarySaleRecipient

Functions to Override

The following functions have been implemented on this contract & are available to be overridden to add custom logic:

* @notice Mints tokens according to the provided mint request.
* @param _req The payload / mint request.
* @param _signature The signature produced by an account signing the mint request.
function mintWithSignature(MintRequest calldata _req, bytes calldata _signature)
returns (address signer)
require(_req.quantity > 0, "Minting zero tokens.");

// Verify and process payload.
signer = _processRequest(_req, _signature);

address receiver =;

// Collect price
_collectPriceOnClaim(_req.primarySaleRecipient, _req.quantity, _req.currency, _req.pricePerToken);

// Mint tokens.
_mint(receiver, _req.quantity);

emit TokensMintedWithSignature(signer, receiver, _req);
     /// @dev Collects and distributes the primary sale value of tokens being claimed.
function _collectPriceOnClaim(
address _primarySaleRecipient,
uint256 _quantityToClaim,
address _currency,
uint256 _pricePerToken
) internal virtual {
if (_pricePerToken == 0) {

uint256 totalPrice = (_quantityToClaim * _pricePerToken) / 1 ether;
require(totalPrice > 0, "quantity too low");

if (_currency == CurrencyTransferLib.NATIVE_TOKEN) {
require(msg.value == totalPrice, "Must send total price.");

address saleRecipient = _primarySaleRecipient == address(0) ? primarySaleRecipient() : _primarySaleRecipient;
CurrencyTransferLib.transferCurrency(_currency, msg.sender, saleRecipient, totalPrice);