> ## Documentation Index
> Fetch the complete documentation index at: https://sequence-0fb8d9e6-api_docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Sequence Indexer Gateway API Installation

> Learn how to install the Sequence Indexer Gateway API for querying blockchain token and NFT data across all networks. Get your API access key from Sequence Builder. Integration is simple with HTTP RPC endpoints for Webapps, Games, and backends.

## Installation

To install Indexer Gateway, follow the instructions for [installing Indexer](/api-references/indexer/installation).

### Using Indexer Gateway in your projects

See the snippets below to learn how to import Indexer Gateway into your
project.

#### Typescript

Setup Sequence Indexer Gateway API in Typescript using the
`@0xsequence/indexer` library.

```ts [Typescript] theme={null}
import { SequenceIndexerGateway } from '@0xsequence/indexer'

const INDEXER_TOKEN = 'AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY';

const indexerGateway = new SequenceIndexerGateway(
  'https://indexer.sequence.app',
  INDEXER_TOKEN
)
```

#### Go

Setup Sequence Indexer Gateway API in Go, and send a ping request to check if
the service is available.

```go [Go] theme={null}
package main

import (
	"context"
	"net/http"

	"github.com/0xsequence/go-sequence/indexer"
)

const indexerToken = "AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY"

func main() {
	seqIndexerGW := indexer.NewIndexerGatewayClient(
		"https://indexer.sequence.app",
		http.DefaultClient,
	)
	
  authCtx, err := indexer.WithHTTPRequestHeaders(ctx, http.Header{
		"X-Access-Key": []string{indexerToken},
	})
	if err != nil {
		log.Fatal(err)
	}

  ok, err := seqIndexerGW.Ping()
  // ...
}
```