Estimated APY [DOT]

def inf_apy():
    auction_adjust = 0
    auction_max = 0
    falloff = 0.05
    max_inflation = 0.1
    min_inflation = 0.025
    stake_target = 0.75

    total_staked = 6_420_000_493_040_793_352
    total_issuance = 12_325_604_969_594_086_733

    num_auctions = 27

    if total_staked == 0 or total_issuance == 0:
        staked_fraction = 0
    else:
        staked_fraction = total_staked / total_issuance

    ideal_stake = stake_target - min(auction_max, num_auctions) * auction_adjust
    ideal_interest = max_inflation / ideal_stake
    if staked_fraction <= ideal_stake:
        inflation = min_inflation + staked_fraction * (ideal_interest - min_inflation / ideal_stake)
    else:
        power_of_two = 2 ** ((ideal_stake - staked_fraction) / falloff)
        inflation = min_inflation + (ideal_interest * ideal_stake - min_inflation) * power_of_two

    return inflation, staked_fraction, inflation / staked_fraction


print(inf_apy())