// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

interface IERC20Exact {
    function balanceOf(address account) external view returns (uint256);
    function decimals() external view returns (uint8);
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
}

interface IAgenticPurchaseVerifier {
    struct Purchase {
        address buyer;
        uint256 chainId;
        address round;
        uint256 quantity;
        uint256 unitPrice;
        uint256 nonce;
        uint256 deadline;
    }
    function verify(Purchase calldata purchase, bytes calldata proof) external view returns (bool);
}

/// @dev Providers must authenticate their oracle and support asynchronous delivery.
interface IRandomnessProvider {
    function requestRandomness() external returns (uint256 requestId);
}

interface IRandomnessReceiver {
    function receiveRandomness(uint256 requestId, uint256 word) external;
}