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Top AI Repos tracks AI repositories on GitHub and answers two different questions about each one: is it moving right now, and would you bet a product on it.
Matching Engine for Limit Order Book in Golang
| Date | Stars |
|---|---|
| 2026-07-30 | 554 |
| 2026-08-07 | 558 |
| 2026-09-05 | 559 |
| 2026-09-12 | 558 |
| 2026-09-16 | 558 |
| 2026-09-27 | 558 |
| 2026-10-03 | 557 |
| 2026-10-05 | 556 |
| 2026-10-08 | 557 |
| 2026-10-10 | 556 |
| 2026-10-18 | 557 |
| 2026-11-04 | 557 |
Today
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Momentum
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growth rate 0.00%/day
# Go orderbook
Improved matching engine written in Go (Golang)
[](https://goreportcard.com/report/github.com/i25959341/orderbook)
[](https://godoc.org/github.com/i25959341/orderbook)
[](https://gocover.run?tag=1.10&repo=github.com%2Fi25959341%2Forderbook)
[](https://masterminds.github.io/stability/active.html)
[](https://travis-ci.org/i25959341/orderbook)
## Features
- Standard price-time priority
- Supports both market and limit orders
- Supports order cancelling
- High performance (above 300k trades per second)
- Optimal memory usage
- JSON Marshalling and Unmarsalling
- Calculating market price for definite quantity
## Usage
To start using order book you need to create object:
```go
import (
"fmt"
ob "github.com/muzykantov/orderbook"
)
func main() {
orderBook := ob.NewOrderBook()
fmt.Println(orderBook)
}
```
Then you be able to use next primary functions:
```go
func (ob *OrderBook) ProcessLimitOrder(side Side, orderID string, quantity, price decimal.Decimal) (done []*Order, partial *Order, err error) { ... }
func (ob *OrderBook) ProcessMarketOrder(side Side, quantity decimal.Decimal) (done []*Order, partial *Order, quantityLeft decimal.Decimal, err error) { .. }
func (ob *OrderBook) CancelOrder(orderID string) *Order { ... }
```
## About primary functions
### ProcessLimitOrder
```go
// ProcessLimitOrder places new order to the OrderBook
// Arguments:
// side - what do you want to do (ob.Sell or ob.Buy)
// orderID - unique order ID in depth
// quantity - how much quantity you want to sell or buy
// price - no more expensive (or cheaper) this price
// * to create new decimal number you should use decimal.New() func
// read more at https://github.com/shopspring/decimal
// Return:
// error - not nil if quantity (or price) is less or equal 0. Or if order with given ID is exists
// done - not nil if your order produces ends of anoter order, this order will add to
// the "done" slice. If your order have done too, it will be places to this array too
// partial - not nil if your order has done but top order is not fully done. Or if your order is
// partial done and placed to the orderbook without full quantity - partial will contain
// your order with quantity to left
// partialQuantityProcessed - if partial order is not nil this result contains processed quatity from partial order
func (ob *OrderBook) ProcessLimitOrder(side Side, orderID string, quantity, price decimal.Decimal) (done []*Order, partial *Order, err error) { ... }
```
For example:
```
ProcessLimitOrder(ob.Sell, "uinqueID", decimal.New(55, 0), decimal.New(100, 0))
asks: 110 -> 5 110 -> 5
100 -> 1 100 -> 56
-------------- -> --------------
bids: 90 -> 5 90 -> 5
80 -> 1 80 -> 1
done - nil
partial - nil
```
```
ProcessLimitOrder(ob.Buy, "uinqueID", decimal.New(7, 0), decimal.New(120, 0))
asks: 110 -> 5
100 -> 1
-------------- -> --------------
bids: 90 -> 5 120 -> 1
80 -> 1 90 -> 5
80 -> 1
done - 2 (or more orders)
partial - uinqueID order
```
```
ProcessLimitOrder(ob.Buy, "uinqueID", decimal.New(3, 0), decimal.New(120, 0))
asks: 110 -> 5
100 -> 1 110 -> 3
-------------- -> --------------
bids: 90 -> 5 90 -> 5
80 -> 1 90 -> 5
done - 1 order with 100 price, (may be also few orders with 110 price) + uinqueID order
partial - 1 order with price 110
```
### ProcessMarketOrder
```go
// ProcessMarketOrder immediately gets defExcerpt of 6,069 characters
Read on GitHub
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Would you bet a product on this? Bounded 0–100 and slow moving.
matched fp:2003bf80d5fcdd7e, topic:trading