Contract Source Code (Vyper language format)

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# @version ^0.3.9
# @title Grid

from vyper.interfaces import ERC20Detailed

struct Plot:
    owner: address
    purchase_count: uint256

grid: public(HashMap[uint256, Plot])

BASE_PRICE: constant(uint256) = 10 ** 16

plots_owned: public(HashMap[address, uint256])

treasury: public(address)

token: public(immutable(address))
mint_per_plot: immutable(uint256)

interface MintableToken:
    def mint(to: address, amount: uint256): nonpayable

event PlotPurchase:
    buyer: indexed(address)
    coord: indexed(uint256)
    price: uint256
    purchase_count: uint256

@external
def __init__(treasury: address, _token: address):
    self.treasury = treasury
    token = _token
    mint_per_plot = 100 * 10 ** convert(ERC20Detailed(token).decimals(), uint256)

@payable
@external
def buy_plot(coord: uint256):
    assert coord < 10000, "Invalid coord"

    # plot price increases by 2x each time it is purchased
    plot_price: uint256 = BASE_PRICE * (2 ** self.grid[coord].purchase_count)
    current_owner: address = self.grid[coord].owner

    assert msg.value >= plot_price, "Not enough ETH sent to buy plot"
    if msg.value > plot_price:
        send(msg.sender, msg.value - plot_price)

    # protocol takes 25% of the purchase price
    # 75% goes to the previous owner
    # if there is no previous owner, 100% goes to the protocol
    # the protocol is the owner of all plots at the start
    if current_owner != ZERO_ADDRESS:
        send(current_owner, plot_price * 3 / 4)
        if current_owner != msg.sender:
            self.plots_owned[current_owner] -= 1
            self.plots_owned[msg.sender] += 1
            self.grid[coord].owner = msg.sender
    else:
        self.grid[coord].owner = msg.sender
        self.plots_owned[msg.sender] += 1

    send(self.treasury, self.balance)

    self.grid[coord].purchase_count += 1

    # mint tokens for the buyer
    MintableToken(token).mint(msg.sender, mint_per_plot)

    log PlotPurchase(msg.sender, coord, plot_price, self.grid[coord].purchase_count)

@view
@external
def get_all_owners(start_index: uint256 = 0, end_index: uint256 = 10000) -> DynArray[address, 10000]:
    owners: DynArray[address, 10000] = []
    for coord in range(start_index, start_index + 10000):
        if coord >= end_index:
            break
        owners.append(self.grid[coord].owner)
    return owners

@view
@external
def get_all_purchase_counts(start_index: uint256 = 0, end_index: uint256 = 10000) -> DynArray[uint256, 10000]:
    purchase_counts: DynArray[uint256, 10000] = []
    for coord in range(start_index, start_index + 10000):
        if coord >= end_index:
            break
        purchase_counts.append(self.grid[coord].purchase_count)
    return purchase_counts

@view
@external
def price(coord: uint256) -> uint256:
    return BASE_PRICE * (2 ** self.grid[coord].purchase_count)

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[{"name":"PlotPurchase","inputs":[{"name":"buyer","type":"address","indexed":true},{"name":"coord","type":"uint256","indexed":true},{"name":"price","type":"uint256","indexed":false},{"name":"purchase_count","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"treasury","type":"address"},{"name":"_token","type":"address"}],"outputs":[]},{"stateMutability":"payable","type":"function","name":"buy_plot","inputs":[{"name":"coord","type":"uint256"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"get_all_owners","inputs":[],"outputs":[{"name":"","type":"address[]"}]},{"stateMutability":"view","type":"function","name":"get_all_owners","inputs":[{"name":"start_index","type":"uint256"}],"outputs":[{"name":"","type":"address[]"}]},{"stateMutability":"view","type":"function","name":"get_all_owners","inputs":[{"name":"start_index","type":"uint256"},{"name":"end_index","type":"uint256"}],"outputs":[{"name":"","type":"address[]"}]},{"stateMutability":"view","type":"function","name":"get_all_purchase_counts","inputs":[],"outputs":[{"name":"","type":"uint256[]"}]},{"stateMutability":"view","type":"function","name":"get_all_purchase_counts","inputs":[{"name":"start_index","type":"uint256"}],"outputs":[{"name":"","type":"uint256[]"}]},{"stateMutability":"view","type":"function","name":"get_all_purchase_counts","inputs":[{"name":"start_index","type":"uint256"},{"name":"end_index","type":"uint256"}],"outputs":[{"name":"","type":"uint256[]"}]},{"stateMutability":"view","type":"function","name":"price","inputs":[{"name":"coord","type":"uint256"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"grid","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"tuple","components":[{"name":"owner","type":"address"},{"name":"purchase_count","type":"uint256"}]}]},{"stateMutability":"view","type":"function","name":"plots_owned","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"treasury","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"token","inputs":[],"outputs":[{"name":"","type":"address"}]}]

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000000000000000000000000055d0f4ab9922c006220e32b75cf02083c955e93000000000000000000000000ce96cc49a25e8c1e6e380f8ab4b64dff188fd035

-----Decoded View---------------
Arg [0] : treasury (address): 0x055D0F4ab9922c006220E32b75cF02083c955e93
Arg [1] : _token (address): 0xCe96cc49a25e8C1E6E380F8Ab4B64DFF188fd035

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000055d0f4ab9922c006220e32b75cf02083c955e93
Arg [1] : 000000000000000000000000ce96cc49a25e8c1e6e380f8ab4b64dff188fd035