x0-wrapper

Program ID: EomiXBbg94Smu4ipDoJtuguazcd1KjLFDFJt2fCabvJ8 x0-wrapper provides a 1:1 USDC-backed stablecoin (x0-USD) that integrates with the protocol’s transfer hook and confidential transfer infrastructure. Users deposit USDC to mint x0-USD, and burn x0-USD to redeem USDC (minus a redemption fee).

Core Invariant

The protocol enforces a strict reserve invariant at all times:

\text{reserve\_usdc\_balance} \geq \text{outstanding\_wrapper\_supply}

This ensures every x0-USD token is backed by at least 1 USDC in the reserve. The WrapperStats.reserve_ratio_scaled() method reports the ratio as a scaled integer (10,000 = 1.0x, 10,100 = 1.01x).

Instructions

Minting & Redemption

`deposit_and_mint`

Deposit USDC → mint x0-USD at a 1:1 ratio. No fee on deposits.

deposit_and_mint(amount: u64)

Minimum deposit: MIN_DEPOSIT_AMOUNT = 1,000,000 (1 USDC)
Transfers USDC from user to reserve account
Mints equivalent x0-USD to user’s token account
Updates WrapperStats counters

`burn_and_redeem`

Burn x0-USD → redeem USDC at 1:1 minus redemption fee.

burn_and_redeem(amount: u64)

Minimum redemption: MIN_REDEMPTION_AMOUNT = 1,000,000 (1 USDC)
Maximum per-transaction: MAX_REDEMPTION_PER_TX = 100,000,000,000 (100K USDC)
Daily cap: MAX_DAILY_REDEMPTIONS = 1,000,000,000,000 (1M USDC)
Redemption fee: WRAPPER_REDEMPTION_FEE_BPS = 80 (0.8%)

fee = amount * redemption_fee_bps / 10000
user_receives = amount - fee

Governance (Timelocked)

All governance actions require a 48-hour timelock (ADMIN_TIMELOCK_SECONDS = 172,800). The flow is:

Schedule

Admin calls schedule_* to create an AdminAction PDA with a scheduled_timestamp.

Wait

48 hours must pass. The action cannot be executed before scheduled_timestamp + ADMIN_TIMELOCK_SECONDS.

Execute

Admin calls execute_* to apply the change. The AdminAction is marked as executed.

`schedule_fee_change` / `execute_fee_change`

Changes the redemption fee. New fee must be within MIN_WRAPPER_FEE_BPS = 10 (0.1%) to MAX_WRAPPER_FEE_BPS = 500 (5%).

`schedule_pause` / `execute_pause`

Pauses or unpauses the wrapper. When paused, deposits and redemptions are disabled.

`emergency_pause`

Immediate pause — bypasses the 48-hour timelock. Used for critical security incidents.

`schedule_emergency_withdraw` / `execute_emergency_withdraw`

Withdraws reserve funds to a specified destination. Subject to the 48-hour timelock.

`cancel_admin_action`

Cancels any pending (not yet executed) admin action.

Admin Transfer

`initiate_admin_transfer`

Initiates a two-step admin transfer to a new admin pubkey.

`accept_admin_transfer`

The new admin accepts the transfer. Until accepted, the original admin retains control.

State Accounts

WrapperConfig

pub struct WrapperConfig {
    pub admin: Pubkey,              // Current admin (multisig recommended)
    pub pending_admin: Option<Pubkey>,
    pub usdc_mint: Pubkey,
    pub wrapper_mint: Pubkey,       // x0-USD mint
    pub reserve_account: Pubkey,    // USDC reserve PDA
    pub redemption_fee_bps: u16,
    pub is_paused: bool,
    pub bump: u8,
}

PDA Seeds: ["wrapper_config"]

WrapperStats

pub struct WrapperStats {
    pub reserve_usdc_balance: u64,
    pub outstanding_wrapper_supply: u64,
    pub total_deposits: u64,
    pub total_redemptions: u64,
    pub total_fees_collected: u64,
    pub daily_redemption_volume: u64,
    pub daily_redemption_reset_timestamp: i64,
    pub last_updated: i64,
    pub bump: u8,
}

PDA Seeds: ["wrapper_stats"] Key methods:

reserve_ratio_scaled() — Returns reserve * 10000 / supply (10,000 = 1.0x backing)
is_healthy() — ratio >= MIN_RESERVE_RATIO_SCALED (10,000)
is_warning() — ratio < RESERVE_WARNING_THRESHOLD (10,100)
maybe_reset_daily_counter() — Resets daily redemption volume at midnight

AdminAction

pub struct AdminAction {
    pub action_type: AdminActionType,
    pub scheduled_timestamp: i64,
    pub new_value: u64,             // For fee changes
    pub new_admin: Pubkey,          // For admin transfers
    pub destination: Pubkey,        // For emergency withdrawals
    pub executed: bool,
    pub cancelled: bool,
    pub bump: u8,
}

PDA Seeds: ["admin_action", action_type]

Reserve Monitoring

The protocol emits ReserveAlert events when the reserve ratio drops below warning thresholds:

Level	Condition	Meaning
`Warning`	Ratio < 1.01x	Reserve approaching 1:1 — redemptions may deplete it
`Critical`	Ratio < 1.0x	Undercollateralized — should not be possible under normal operation

Events Emitted

Event	When
`WrapperInitialized`	Config and mint created
`DepositMinted`	USDC deposited, x0-USD minted
`RedemptionCompleted`	x0-USD burned, USDC redeemed
`ReserveAlert`	Reserve ratio below threshold
`WrapperPausedEvent`	Wrapper paused/unpaused
`FeeRateUpdated`	Redemption fee changed
`AdminActionScheduled`	Timelock action created
`AdminActionExecuted`	Timelock action applied
`AdminActionCancelled`	Pending action cancelled
`EmergencyWithdrawal`	Reserve funds withdrawn
`AdminTransferred`	Admin key changed

Overview

Core Programs

Zero-Knowledge

Application Layer

Reference

Core Invariant

Instructions

Minting & Redemption

`deposit_and_mint`

`burn_and_redeem`

Governance (Timelocked)

`schedule_fee_change` / `execute_fee_change`

`schedule_pause` / `execute_pause`

`emergency_pause`

`schedule_emergency_withdraw` / `execute_emergency_withdraw`

`cancel_admin_action`

Admin Transfer

`initiate_admin_transfer`

`accept_admin_transfer`

State Accounts

WrapperConfig

WrapperStats

AdminAction

Reserve Monitoring

Events Emitted

Overview

Core Programs

Zero-Knowledge

Application Layer

Reference

​Core Invariant

​Instructions

​Minting & Redemption

​deposit_and_mint

​burn_and_redeem

​Governance (Timelocked)

​schedule_fee_change / execute_fee_change

​schedule_pause / execute_pause

​emergency_pause

​schedule_emergency_withdraw / execute_emergency_withdraw

​cancel_admin_action

​Admin Transfer

​initiate_admin_transfer

​accept_admin_transfer

​State Accounts

​WrapperConfig

​WrapperStats

​AdminAction

​Reserve Monitoring

​Events Emitted

Core Invariant

Instructions

Minting & Redemption

`deposit_and_mint`

`burn_and_redeem`

Governance (Timelocked)

`schedule_fee_change` / `execute_fee_change`

`schedule_pause` / `execute_pause`

`emergency_pause`

`schedule_emergency_withdraw` / `execute_emergency_withdraw`

`cancel_admin_action`

Admin Transfer

`initiate_admin_transfer`

`accept_admin_transfer`

State Accounts

WrapperConfig

WrapperStats

AdminAction

Reserve Monitoring

Events Emitted