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https://github.com/massive-com/client-go

The official Go client library for the Massive REST and WebSocket API.
https://github.com/massive-com/client-go

crypto-trading forex-trading go golang options-trading realtime-stocks rest-api stock-data stock-market stocks-api trading

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The official Go client library for the Massive REST and WebSocket API.

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README 

          
# Massive (formerly Polygon.io) Go Client - WebSocket & RESTful APIs



The official Go client library for the [Massive](https://massive.com/) REST and WebSocket API. This client makes use of Go generics and thus requires Go 1.18. See the [docs](https://massive.com/docs/stocks/getting-started) for more details on our API.



**Note:** Polygon.io has rebranded as [Massive.com](https://massive.com) on Oct 30, 2025. Existing API keys, accounts, and integrations continue to work exactly as before. The only change in this SDK is that it now defaults to the new API base at `api.massive.com`, while `api.polygon.io` remains supported for an extended period.



For details, see our [rebrand announcement blog post](https://massive.com/blog/polygon-is-now-massive/) or open an issue / contact [support@massive.com](mailto:support@massive.com) if you have questions.



## Getting Started



This section guides you through setting up a simple project with massive.com/client-go.



First, make a new directory for your project and navigate into it:

```bash

mkdir myproject && cd myproject

```



Next, initialize a new module for dependency management. This creates a `go.mod` file to track your dependencies:

```bash

go mod init example

```



Then, create a `main.go` file. For quick start, you can find over 100+ [example code snippets](https://github.com/massive-com/client-go/tree/master/rest/example) that demonstrate connecting to both the REST and WebSocket APIs. Here's an example that fetches the last trade for `AAPL`.



```bash

cat > main.go <"          <- windows

```



Then, run `go mod tidy` to automatically download and install the necessary dependencies. This command ensures your `go.mod` file reflects all dependencies used in your project:

```bash

go mod tidy

```



Finally, execute your application:

```bash

go run main.go

```



## REST API Client



[![rest-docs][rest-doc-img]][rest-doc]



To get started, you'll need to import two main packages.



```golang

import (

	massive "github.com/massive-com/client-go/v2/rest"

	"github.com/massive-com/client-go/v2/rest/models"

)

```



Next, create a new client with your [API key](https://massive.com/dashboard/signup).



```golang

c := massive.New("YOUR_API_KEY")

```



Or create a client with a custom HTTP client implementation.



```golang

hc := http.Client{} // some custom HTTP client

c := massive.NewWithClient("YOUR_API_KEY", hc)

```



### Using the client



After creating the client, making calls to the Massive API is simple.



```golang

params := models.GetTickerDetailsParams{

    Ticker: "AAPL",

}.WithDate(models.Date(time.Date(2021, 7, 22, 0, 0, 0, 0, time.Local)))



res, err := c.GetTickerDetails(context.Background(), params)

if err != nil {

    log.Fatal(err)

}

log.Print(res) // do something with the result

```



### Pagination



Our list methods return iterators that handle pagination for you.



```golang

// create a new iterator

params := models.ListTradesParams{Ticker: "AAPL"}.

    WithTimestamp(models.GTE, models.Nanos(time.Date(2021, 7, 22, 0, 0, 0, 0, time.UTC))).

    WithOrder(models.Asc)

iter := c.ListTrades(context.Background(), params)



// iter.Next() advances the iterator to the next value in the list

for iter.Next() {

    log.Print(iter.Item()) // do something with the current value

}



// if the loop breaks, it has either reached the end of the list or an error has occurred

// you can check if something went wrong with iter.Err()

if iter.Err() != nil {

    log.Fatal(iter.Err())

}

```



We also provide a builder method to make it easier to retrieve all trades and quotes for a specific day.



```golang

params := models.ListQuotesParams{Ticker: "AAPL"}.

    WithDay(2021, 7, 22). // get all quotes for July 22, 2021

    WithOrder(models.Asc)

iter := c.ListQuotes(context.Background(), params)



for iter.Next() {

    log.Print(iter.Item())

}

if iter.Err() != nil {

    log.Fatal(iter.Err())

}

```



### Request options



Advanced users may want to add additional headers or query params to a given request.



```golang

params := &models.GetGroupedDailyAggsParams{

    Locale:     models.US,

    MarketType: models.Stocks,

    Date:       models.Date(time.Date(2021, 7, 22, 0, 0, 0, 0, time.Local)),

}



res, err := c.GetGroupedDailyAggs(context.Background(), params,

    models.APIKey("YOUR_OTHER_API_KEY"),

    models.Header("X-CUSTOM-HEADER", "VALUE"),

    models.QueryParam("adjusted", strconv.FormatBool(true)))

if err != nil {

    log.Fatal(err)

}

log.Print(res) // do something with the result

```



### Debugging



Sometimes you may find it useful to see the actual request and response details while working with the API. The client allows for this through its `models.WithTrace(true)` option.



#### How to Enable Debug Mode



You can activate the debug mode per request as follows by adding `models.WithTrace(true)` after the `params`:



```go

iter := c.ListAggs(context.Background(), params, models.WithTrace(true))

```



#### What Does Debug Mode Do?



When debug mode is enabled, the client will print out useful debugging information for each API request. This includes: the request URL, the headers sent in the request, and the headers received in the response.



#### Example Output



For instance, if you made a request for `TSLA` data for the date `2023-08-01`, you would see debug output similar to the following:



```

Request URL: /v2/aggs/ticker/AAPL/range/1/day/1672531200000/1678320000000?adjusted=true&limit=50000&sort=desc

Request Headers: map[Accept-Encoding:[gzip] Authorization:[REDACTED] User-Agent:[Massive.com GoClient/v1.14.1]]

Response Headers: map[Content-Encoding:[gzip] Content-Length:[1639] Content-Type:[application/json] Date:[Tue, 05 Sep 2023 23:25:00 GMT] Server:[nginx/1.19.2] Strict-Transport-Security:[max-age=15724800; includeSubDomains] Vary:[Accept-Encoding] X-Request-Id:[ba3d3e9f42622bd16d05dafe01200f72]]

```



This can be an invaluable tool for debugging issues or understanding how the client interacts with the API.



## WebSocket Client



[![ws-docs][ws-doc-img]][ws-doc]



Import the WebSocket client and models packages to get started.



```golang

import (

    massivews "github.com/massive-com/client-go/v2/websocket"

    "github.com/massive-com/client-go/v2/websocket/models"

)

```



Next, create a new client with your API key and a couple other config options.



```golang

// create a new client

c, err := massivews.New(massivews.Config{

    APIKey:    "YOUR_API_KEY",

    Feed:      massivews.RealTime,

    Market:    massivews.Stocks,

})

if err != nil {

    log.Fatal(err)

}

defer c.Close() // the user of this client must close it



// connect to the server

if err := c.Connect(); err != nil {

    log.Error(err)

    return

}

```



The client automatically reconnects to the server when the connection is dropped. By default, it will attempt to reconnect indefinitely but the number of retries is configurable. When the client successfully reconnects, it automatically resubscribes to any topics that were set before the disconnect.



### Using the client



After creating a client, subscribe to one or more topics and start accessing data. Currently, all of the data is pushed to a single output channel.



```golang

// passing a topic by itself will subscribe to all tickers

if err := c.Subscribe(massivews.StocksSecAggs); err != nil {

    log.Fatal(err)

}

if err := c.Subscribe(massivews.StocksTrades, "TSLA", "GME"); err != nil {

    log.Fatal(err)

}



for {

    select {

    case err := <-c.Error(): // check for any fatal errors (e.g. auth failed)

        log.Fatal(err)

    case out, more := <-c.Output(): // read the next data message

        if !more {

            return

        }



        switch out.(type) {

        case models.EquityAgg:

            log.Print(out) // do something with the agg

        case models.EquityTrade:

            log.Print(out) // do something with the trade

        }

    }

}

```



See the [full example](./websocket/example/main.go) for more details on how to use this client effectively.



## Release planning



This client will attempt to follow the release cadence of our API. When endpoints are deprecated and newer versions are added, the client will maintain two methods in a backwards compatible way (e.g. `ListTrades` and `ListTradesV4(...)`). When deprecated endpoints are removed from the API, we'll rename the versioned method (e.g. `ListTradesV4(...)` -> `ListTrades(...)`), remove the old method, and release a new major version of the client. The goal is to give users ample time to upgrade to newer versions of our API _before_ we bump the major version of the client, and in general, we'll try to bundle breaking changes like this to avoid frequent major version bumps.



There are a couple exceptions to this. When we find small breaking issues with this client library (e.g. incorrect response types), we may decide to release them under the same major version. These changes will be clearly outlined in the release notes. Also, methods that fall under the VX client are considered experimental and may be modified or deprecated as needed. We'll call out any breaking changes to VX endpoints in our release notes to make using them easier.



## Contributing



If you found a bug or have an idea for a new feature, please first discuss it with us by [submitting a new issue](https://github.com/massive-com/client-go/issues/new/choose). We will respond to issues within at most 3 weeks. We're also open to volunteers if you want to submit a PR for any open issues but please discuss it with us beforehand. PRs that aren't linked to an existing issue or discussed with us ahead of time will generally be declined.



-------------------------------------------------------------------------------



[doc-img]: https://pkg.go.dev/badge/github.com/massive-com/client-go/v2

[doc]: https://pkg.go.dev/github.com/massive-com/client-go/v2

[rest-doc-img]: https://pkg.go.dev/badge/github.com/massive-com/client-go/v2/rest

[rest-doc]: https://pkg.go.dev/github.com/massive-com/client-go/v2/rest

[ws-doc-img]: https://pkg.go.dev/badge/github.com/massive-com/client-go/v2/websocket

[ws-doc]: https://pkg.go.dev/github.com/massive-com/client-go/v2/websocket

[build-img]: https://github.com/massive-com/client-go/v2/actions/workflows/test.yml/badge.svg

[build]: https://github.com/massive-com/client-go/v2/actions

[report-card-img]: https://goreportcard.com/badge/github.com/massive-com/client-go/v2

[report-card]: https://goreportcard.com/report/github.com/massive-com/client-go/v2