Order Types

Senticore is designed for professional order handling across spot, binary options, and prediction markets.

Test coverage

Every order type below has dedicated behavior test coverage and is included in continuous integration coverage gating. Randomized sequence fuzzing across supported order types runs regularly, asserting deterministic state across independent engine instances.

Time-in-force

Type	Behavior
GTC	Rests on the book until filled, cancelled, or expired
IOC	Fills immediately against available liquidity and cancels the remainder
FOK	Fills the entire quantity immediately or rejects
Post-only	Rests as maker liquidity; rejects if it would cross the spread

Modifiers

Modifier	Behavior
is_market	Market order; takes available liquidity
reduce_only	Can only reduce an existing position
stp_mode	Self-trade prevention behavior
expires_at	Auto-cancel timestamp for eligible orders

Conditional orders

Conditional orders trigger child orders based on market conditions.

Stop loss

await sdk.placeConditionalOrder({
  market: 'BTC-USDC',
  conditionalKind: 'stop_loss',
  triggerDirection: 'at_or_below',
  triggerPrice: 60000,
  child: {
    side: 'sell',
    quantity: 1,
    timeInForce: 'ioc',
  },
});

Direction	Use case
at_or_below	Sell-side stop for downside protection
at_or_above	Buy-side stop or short-position protection

Take profit

await sdk.placeConditionalOrder({
  market: 'BTC-USDC',
  conditionalKind: 'take_profit',
  triggerDirection: 'at_or_above',
  triggerPrice: 80000,
  child: {
    side: 'sell',
    quantity: 1,
    timeInForce: 'gtc',
    price: 79500,
  },
});

OCO

One-cancels-other links a take-profit and stop-loss path. When one triggers, the linked order is cancelled.

const takeProfit = await sdk.placeConditionalOrder({
  market: 'BTC-USDC',
  conditionalKind: 'take_profit',
  triggerDirection: 'at_or_above',
  triggerPrice: 80000,
  child: {side: 'sell', quantity: 1, timeInForce: 'gtc', price: 79500},
});

await sdk.placeConditionalOrder({
  market: 'BTC-USDC',
  conditionalKind: 'stop_loss',
  triggerDirection: 'at_or_below',
  triggerPrice: 60000,
  linkedConditionalId: takeProfit.id,
  child: {side: 'sell', quantity: 1, timeInForce: 'ioc'},
});

Algorithmic orders

Algorithmic orders execute over time according to a strategy.

Iceberg

await sdk.placeAlgoOrder({
  market: 'BTC-USDC',
  side: 'buy',
  totalQty: 100,
  algo: {
    kind: 'iceberg',
    displayQty: 5,
  },
});

Behavior:

• Only the display quantity is visible at a time.
• A new slice posts as the visible slice fills.
• Cancelling the parent releases remaining reserved collateral.

TWAP

await sdk.placeAlgoOrder({
  market: 'BTC-USDC',
  side: 'buy',
  totalQty: 100,
  algo: {
    kind: 'twap',
    sliceQty: 5,
    intervalMs: 60000,
    startAt: Date.now() + 30000,
  },
});

Behavior:

• Slices are submitted on a fixed interval.
• The last slice is capped to remaining quantity.
• A stale or blocked child order prevents uncontrolled order spam.

VWAP

await sdk.placeAlgoOrder({
  market: 'BTC-USDC',
  side: 'buy',
  totalQty: 100,
  algo: {
    kind: 'vwap',
    participationBps: 1000,
    minSliceQty: 1,
  },
});

Behavior:

• Child size follows recent market volume.
• participationBps controls the target share of market volume.
• Execution pauses when observed volume is zero.

Validation rules

Rule	Behavior
Price tick	Price must align to the market tick size
Lot size	Quantity must align to lot size
Max quantity	Per-market cap is enforced
Open order cap	Per-account cap is enforced
Book depth cap	Prevents unbounded price-level growth
Minimum notional	Rejects dust orders

Representative pre-launch market parameters are documented on the Markets page. Final production values can change before closed beta and public mainnet.

Market	Tick size	Lot size	Minimum notional
BTC-USDC	0.01 USDC	0.0001 BTC	10 USDC
ETH-USDC	0.01 USDC	0.001 ETH	10 USDC
SOL-USDC	0.001 USDC	0.01 SOL	5 USDC
YES/NO markets	0.001 USDC	1 contract	5 USDC

Common rejection reasons

Error	Meaning
PostOnlyRequiresPassiveLimitOrder	Post-only order would take liquidity or is not a passive limit
InsufficientCollateral	Account lacks free collateral
OrderbookFull	Price-level cap reached
WouldCrossSpread	Post-only order would cross the spread
ReduceOnlyExceedsPosition	Reduce-only order would increase exposure