Trading pairs

Each [[symbols]] entry registers one symbol. IDs must be unique. Prices and quantities on the wire always use scale 10^8; price_scale and qty_scale do not change the wire scale.

[[symbols]]
id = 0
base = "BTC"
quote = "USDT"
price_scale = 2
qty_scale = 8
min_qty = "0.00001"
max_qty = "10000.0"
qty_step = "0.00001"
price_step = "0.01"
invariant_policy = "halt_symbol"

[symbols.risk]
max_order_qty = "10000.0"
max_order_notional = "100000000.0"
price_band_bps = 1000
reference_price = "50000.0"
max_orders_per_second = 1000
max_open_orders = 100000
trading_enabled = true
self_trade_prevention = false

Limits and steps are decimal strings, parsed without binary floating-point rounding. Quantity must be positive, within min/max bounds and a multiple of qty_step. Limit prices must be positive and a multiple of price_step.

For example, 50000.50 is raw price 5000050000000 and 0.5 is raw quantity 50000000, regardless of symbol display scales. Use checked integer/decimal conversion in clients.

Adding or changing symbols, risk settings or shard count in an existing durable deployment can make recovery incompatible. Validate against copied storage and follow the upgrade procedure.