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

# Metadata

The Sequence Metadata API service offers a simple and fast API to query token & NFT metadata
for Ethereum-compatible chains which is available as an submodule through the `@0xsequence/metadata` package or via HTTP requests.

To learn how to use the Sequence Metadata service, please read:

* [Token metadata API & standards](/api-references/metadata/examples/token-metadata)
* [Contract-level metadata API & standards](/api-references/metadata/examples/contract-metadata)
* [Alternative, REST API Usage](/api-references/metadata/examples/rest-api)

### Web / node.js Installation

```bash Terminal theme={null}
npm install 0xsequence
```

or

```bash Terminal theme={null}
npm install @0xsequence/metadata
```

<Note>
  This installation requires an API Access Key from [Sequence Builder](https://sequence.build).
</Note>

then in your app (using your `API Access Key`),

```ts theme={null}
import { SequenceMetadata } from '@0xsequence/metadata'

const metadata = new SequenceMetadata('https://metadata.sequence.app', 'AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY')
```

**NOTE:** if you're using `@0xsequence/metadata` from node.js, we recommend using node v18.x or newer.

### Go Installation

```bash theme={null}
go get -u github.com/0xsequence/go-sequence@latest
```

then in your app,

```go theme={null}
import (
	"github.com/0xsequence/go-sequence/metadata"
)

seqMetadata := metadata.NewMetadata("AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY")

contractInfo, err := seqMetadata.GetContractInfo(context.Background(), "polygon", "0x631998e91476DA5B870D741192fc5Cbc55F5a52E")
```

### Unity or Unreal Installation

The Sequence Metadata is integrated directly inside of the respective [Sequence Unity](/sdk/unity/overview) and [Sequence Unreal](/sdk/unreal/overview) SDKs.