Crypto Brokerage
Orders, Precision and Rounding
Learn about tick size, precision, rounding and other recommendations.
We recommend that REST and WebSocket integrations support the maximum decimal precision of 0.000001 (1e-6) for all current and future assets (parameter precision differs for some services).
All FIX integrations should support up to 19 decimal places 0.0000000000000000001 (1e-19) for all assets.
Tick size, miniums and other precision information is for USD markets only.
For information on other markets, contact support.
Order Limitations
- For market buy orders, the minimum quantity is 0.01 USD for all assets. For market sell or limit orders, the minimum size is eight ticks: 0.00000001 (1e-8).
- For market orders, the maximum notional value is 500,000 USD. For limit orders, the maximum notional value is 1,500,000 USD for XBTUSD and ETHUSD markets, and 1,000,000 USD for other markets.
- A taker order will be rejected if its limit price is 15% or more from the midpoint of the best bid and best ask.
- For a comprehensive look at order constraints, please refer to our the documentation for the Paxos v2 REST API docs or the Paxos FIX API Reference page
Tick and Decimal Precision for REST and WebSocket Clients
| Market | Minimum Tick Size (USD) | Maximum Decimal Precision (USD) |
|---|---|---|
| AAVEUSD | 0.01 | 0.000001 (1e-6) |
| BCHUSD | 0.05 | 0.000001 (1e-6) |
| BTCUSD | 0.25 | 0.000001 (1e-6) |
| ETHUSD | 0.05 | 0.000001 (1e-6) |
| LINKUSD | 0.01 | 0.000001 (1e-6) |
| LTCUSD | 0.01 | 0.000001 (1e-6) |
| (MATICUSD)* | 0.0001 | 0.000001 (1e-6) |
| PAXGUSD | 0.01 | 0.000001 (1e-6) |
| SOLUSD | 0.01 | 0.000001 (1e-6) |
| UNIUSD | 0.01 | 0.000001 (1e-6) |
Additional Parameter Precision
The tick size and precision for some request and response parameters requires clients to implement differing precision. We recommend ensuring all REST clients implement the following:quote_amounttick size of 0.01 (1e-2) for Create Order.volume_weighted_average_pricetick size of 0.00000001 (1e-8) for Get Order and List Orders.average_priceprecision of 0.000001 (1e-6) for List Historical Prices.commissionandrebatetick size of 0.0000000000000000001 (1e-19) for List Executions.gross_trade_amounttick size of 0.00000000000001 (1e-14) for List Executions.amountprecision of 0.00000001 (1e-8) for Get Ticker, Get Order Book and List Executions.base_amountprecision of 0.00000001 (1e-8) for List Orders, Create Order and Get Order.amount_filledprecision of 0.00000001 (1e-8) for List Orders, Create Order and Get Order.
Tick and Decimal Precision for FIX Clients
Ideally, your FIX integrations should support up to 19 decimal places, 0.0000000000000000001 (1e-19), for all assets. Minimally, you your integrations must support 17 decimal places, 0.00000000000000001 (1e-17), for all assets.Rounding
Paxos uses different rounding logic for different services.Volume Weighted Average Price
Thevolume_weighted_average_price field is rounded using half-up logic after eight decimals.
This provides the volume-weighted average price across all underlying executions for an order within List Executions.
HRQ Rounding
Rounding differs depending on the direction and side in combination with the given quote amount or base amount. All assets are rounded to two (2) decimal points of precision except BRL. BRL is truncated to six (6) decimal points.- Ceil: Round up fully for any decimal places.
- Floor: Round down fully for any decimal places.
| Direction + Side | Rounding Behavior |
|---|---|
| Base Amount Input + BUY | Ceil (Quote Amount) |
| Base Amount Input + SELL | Floor (Quote Amount) |
| Quote Amount Input + BUY | Floor (Base Amount) |
| Quote Input Amount + SELL | Ceil (Base Amount) |