Prediction Markets

pub struct BondingCurve {
    token_resource: ResourceAddress,
    collateral_vault: Vault,
    tokens_sold: Amount,
    total_supply: Amount,
    graduation_threshold: Amount, // 100_000 tTARI
    graduated: bool,
}
/// price = k * (tokens_sold / total_supply)^2
fn current_price(&self) -> Amount {
    let ratio = self.tokens_sold
        .checked_mul(amount![1_000_000])
        .expect("overflow")
        .checked_div(self.total_supply)
        .expect("div");
    ratio.checked_mul(ratio).expect("overflow")
        .checked_div(amount![1_000_000])
        .expect("div")
}
pub fn buy(&mut self, collateral: Bucket, min_out: Amount) -> Bucket {
    assert!(!self.graduated, "graduated — use AMM");
    let tari_in = collateral.amount();
    let tokens_out = tari_in.checked_div(self.current_price()).expect("div");
    assert!(tokens_out >= min_out, "slippage");
    self.collateral_vault.deposit(collateral);
    self.tokens_sold = self.tokens_sold.checked_add(tokens_out).expect("overflow");
    if self.collateral_vault.amount() >= self.graduation_threshold {
        self.graduated = true;
        emit_event!("graduated", metadata!["token" => self.token_resource]);
    }
    ResourceManager::get(self.token_resource).mint(tokens_out)
}

# build
cargo build --target wasm32-unknown-unknown --release

# deploy prediction market
tari template publish --binary prediction_market.wasm --network esmeralda

# deploy token launcher
tari template publish --binary token_launcher.wasm --network esmeralda