Twelve Data API client for Go

Twelve Data official library. This package supports all main features of the service:

• Real-time and historical market data: time series, quotes, end-of-day prices, exchange rates, and market movers.
• Fundamentals: financial statements, earnings, dividends, splits, company profiles, and key statistics.
• 100+ technical indicators: SMA, EMA, RSI, MACD, Bollinger Bands, Ichimoku, and many more.
• Analysis & estimates: analyst ratings, price targets, EPS trends, revenue and growth estimates.
• ETFs and mutual funds: summaries, composition, performance, risk, and ratings.

🔑 API key is required. If you don't have it yet, get it by signing up here.

Requirements

Go 1.23 or later.

Installation

go get github.com/twelvedata/twelvedata-go/twelvedata

🔗 View the package on pkg.go.dev.

Quick start

1. Set up a new project

mkdir my-go-app && cd my-go-app
go mod init my-go-app
go get github.com/twelvedata/twelvedata-go/twelvedata

2. Create main.go

package main

import (
    "context"
    "errors"
    "fmt"
    "log"

    twelvedata "github.com/twelvedata/twelvedata-go/twelvedata"
)

func main() {
    cfg, err := twelvedata.NewConfig("YOUR_API_KEY_HERE") // defaults to os.Getenv("TWELVEDATA_API_KEY")
    if err != nil {
        log.Fatal(err)
    }
    client := twelvedata.NewAPIClient(cfg)

    resp, _, err := client.MarketDataAPI.GetTimeSeries(context.Background()).
        Symbol("AAPL").Interval("1day").Outputsize(5).Execute()
    if err != nil {
        var apiErr twelvedata.TwelvedataApiError
        if errors.As(err, &apiErr) {
            log.Fatalf("API error [%d]: %s", apiErr.GetStatusCode(), apiErr.GetMessage())
        }
        log.Fatalf("Unexpected error: %v", err)
    }
    fmt.Println(resp)
}

3. Run

go run main.go

👀 Check the full example and other examples here.

WebSocket

Twelve Data also exposes a WebSocket API for real-time price streaming. This package ships a wrapper client around it that handles authentication, application-level heartbeat, WebSocket-protocol ping/pong, exponential-backoff auto-reconnect with subscription replay, and typed errors. See the Twelve Data WebSocket documentation for protocol details.

For the full list of WebSocket error types and recommended handling, see WebSocket errors.

Installation

The WebSocket client lives in the /ws sub-package and pulls in github.com/gorilla/websocket as an extra dependency. Install it alongside the main package:

go get github.com/twelvedata/twelvedata-go/twelvedata/ws

Usage

package main

import (
    "context"
    "errors"
    "log"

    "github.com/twelvedata/twelvedata-go/twelvedata/ws"
)

func main() {
    client, err := ws.NewClient(ws.Options{}) // APIKey defaults to $TWELVEDATA_API_KEY
    if err != nil {
        log.Fatal(err)
    }
    defer client.Disconnect()

    go func() {
        for p := range client.Prices() {
            log.Printf("%s @ %v", p.Symbol, p.Price)
        }
    }()
    go func() {
        for s := range client.SubscribeStatuses() {
            log.Printf("subscribe-status: %s, success=%d, fails=%d", s.Status, len(s.Success), len(s.Fails))
        }
    }()
    go func() {
        for r := range client.Reconnecting() {
            log.Printf("reconnecting: attempt=%d, in=%s", r.Attempt, r.Delay)
        }
    }()
    go func() {
        for err := range client.Errors() {
            var authErr *ws.AuthError
            if errors.As(err, &authErr) {
                log.Fatalf("auth: %v", authErr)
            }
            log.Printf("ws error: %v", err)
        }
    }()

    if err := client.Connect(context.Background()); err != nil {
        var authErr *ws.AuthError
        if errors.As(err, &authErr) {
            log.Fatalf("auth: %v", authErr)
        }
        log.Fatal(err)
    }

    if err := client.Subscribe("AAPL,EUR/USD"); err != nil {
        log.Fatal(err)
    }

    select {} // run forever
}

Event channels are buffered (ws.DefaultEventBuffer = 256 per channel). Consume promptly — when a channel is full, new events are dropped and the per-channel counter exposed by client.Stats() is incremented.

WebSocket client configuration

ws.Options exposes every knob; zero-valued fields fall back to the package-level ws.Default* constants.

client, err := ws.NewClient(ws.Options{
    APIKey:            "YOUR_API_KEY_HERE",                  // or $TWELVEDATA_API_KEY
    URL:               ws.DefaultURL,                        // wss://ws.twelvedata.com/v1/quotes/price
    HeartbeatInterval: ws.DefaultHeartbeatInterval,          // 10s; <= 0 disables app-level heartbeat
    PingInterval:      ws.DefaultPingInterval,               // 30s; <= 0 disables protocol ping/pong
    PingTimeout:       ws.DefaultPingTimeout,                // 10s pong-arrival deadline
    EventBuffer:       ws.DefaultEventBuffer,                // 256 per channel
    Reconnect: ws.ReconnectOptions{
        // Disabled: true,                                   // uncomment to disable auto-reconnect
        InitialDelay:  ws.DefaultReconnectInitialDelay,      // 1s
        MaxDelay:      ws.DefaultReconnectMaxDelay,          // 30s cap
        MaxAttempts:   ws.DefaultReconnectMaxAttempts,       // 10; -1 to retry forever
        BackoffFactor: ws.DefaultReconnectBackoffFactor,     // 2.0
    },
})

Error Handling

See error_handling.md for error types, fields, and usage examples.

For the complete list of API error codes and their meanings, see the Twelve Data Errors documentation.

API Reference

See api_reference.md for the complete list of API endpoints and models.

Integration tests

This repo ships a live-API integration suite at twelvedata/endpoints_test.go. It hits every supported endpoint once against the real Twelve Data API and is used to catch regressions before publishing a new client version. Running the suite spends API quota.

Setup

export TWELVEDATA_API_KEY=<your-key>

Run

go test -tags=integration -v -timeout=10m ./twelvedata/...

The build tag (-tags=integration) keeps the suite out of go test ./.... On success the output ends with PASS; a non-zero exit means at least one endpoint failed.

Editor setup

The //go:build integration tag also hides endpoints_test.go from default Go tooling, so editors using gopls (VS Code, GoLand, Neovim, etc.) report "no packages found" and disable autocomplete in this file out of the box. To get full IntelliSense, add the integration build tag to your editor's Go config — for example, in VS Code's settings.json:

{
    "go.buildTags": "integration",
    "gopls": {
        "build.buildFlags": ["-tags=integration"]
    }
}

Documentation

Delve deeper with our official documentation.

Examples

Explore practical scenarios in the examples directory.

Support

• 🌐 Visit our contact page.
• 🛠 Or our support center.

Stay updated

• Follow us on 𝕏.
• Follow us on Telegram.

Contributing

1. Fork and clone: $ git clone https://github.com/twelvedata/twelvedata-go ..
2. Branch out: $ git checkout -b my-feature.
3. Commit changes and test.
4. Push your branch and open a pull request with a comprehensive description.

For more guidance on contributing, see the GitHub Docs on GitHub.

License

This project is licensed under the MIT. See the LICENSE file in this repository for more details.