alpaca-trade-api-go
is a Go library for the Alpaca trade API. It allows rapid trading algo development easily, with support for the both REST and streaming interfaces. For details of each API behavior, please see the online API document.
$ go get github.com/alpacahq/alpaca-trade-api-go
In order to call Alpaca's trade API, you need to obtain an API key pair. Replace <key_id> and <secret_key> with what you get from the web console.
import (
"os"
"fmt"
"github.com/alpacahq/alpaca-trade-api-go/alpaca"
"github.com/alpacahq/alpaca-trade-api-go/common"
)
func init() {
os.Setenv(common.EnvApiKeyID, "<key_id>")
os.Setenv(common.EnvApiSecretKey, "<secret_key>")
fmt.Printf("Running w/ credentials [%v %v]\n", common.Credentials().ID, common.Credentials().Secret)
alpaca.SetBaseUrl("https://paper-api.alpaca.markets")
}
func main() {
alpacaClient := alpaca.NewClient(common.Credentials())
acct, err := alpacaClient.GetAccount()
if err != nil {
panic(err)
}
fmt.Println(*acct)
}
The SDK provides a unified streaming interface for both Polygon data updates, and Alpaca's trade/account updates. The following example subscribes to trade updates, and prints any messages received, and subscribes to live quotes for AAPL, and prints any quotes received. The main function also ends with an empty select{}
statement which causes the program to run indefinitely.
Please note that running this example as-is requires that you have a funded Alpaca brokerage account, as that is necessary for access to Polygon's API.
package main
import (
"fmt"
"os"
"github.com/alpacahq/alpaca-trade-api-go/alpaca"
"github.com/alpacahq/alpaca-trade-api-go/common"
"github.com/alpacahq/alpaca-trade-api-go/polygon"
"github.com/alpacahq/alpaca-trade-api-go/stream"
)
func main() {
os.Setenv(common.EnvApiKeyID, "your_key_id")
os.Setenv(common.EnvApiSecretKey, "your_secret_key")
if err := stream.Register(alpaca.TradeUpdates, tradeHandler); err != nil {
panic(err)
}
if err := stream.Register("Q.AAPL", quoteHandler); err != nil {
panic(err)
}
select {}
}
func tradeHandler(msg interface{}) {
tradeupdate := msg.(alpaca.TradeUpdate)
fmt.Printf("%s event received for order %s.\n", tradeupdate.Event, tradeupdate.Order.ID)
}
func quoteHandler(msg interface{}) {
quote := msg.(polygon.StreamQuote)
fmt.Println(quote.Symbol, quote.BidPrice, quote.BidSize, quote.AskPrice, quote.AskSize)
}
The HTTP API document is located at https://docs.alpaca.markets/
The Alpaca API requires API key ID and secret key, which you can obtain from the web console after you sign in. This key pair can then be applied to the SDK either by setting environment variables (APCA_API_KEY_ID=<key_id>
and APCA_API_SECRET_KEY=<secret_key>
), or hardcoding them into the Go code directly as shown in the examples above.
$ export APCA_API_KEY_ID=xxxxx
$ export APCA_API_SECRET_KEY=yyyyy
For paper trading, set the environment variable APCA_API_BASE_URL
.
$ export APCA_API_BASE_URL=https://paper-api.alpaca.markets
You can also instead use the function alpaca.SetBaseUrl("https://paper-api.alpaca.markets")
to configure the endpoint.
For a more in-depth look at the SDK, see the GoDoc