> ## 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.

# Contract Metadata

* [Learn how to query contract-level metadata directly for any contract](/api-references/metadata/examples/token-metadata#fetch-token-metadata-for-any-erc721-or-erc1155-contract)
* [Learn about contract-level metadata for ERC20, ERC721 and ERC1155 tokens](/api-references/metadata/examples/token-metadata#token-metadata-standards)
* [Learn about querying contract-level info metadata extensions for ERC20, ERC721 and ERC1155 tokens](/api-references/metadata/examples/contract-metadata#search-contract-metadata)

<Note>
  \[PRO TIP: Sequence Indexer also returns token metadata]

  When using the [Sequence Indexer](/api-references/indexer/overview), pass `"includeMetadata": true` to your request to
  query token metadata for any ERC20, ERC721 or ERC1155 contract. See below how to fetch
  contract-level metadata directly.
</Note>

## Fetch contract metadata of any ERC20, ERC721 or ERC1155 contract address

*Sequence Metadata `GetContractInfoBatch` Method:*

* Request: POST /rpc/Metadata/GetContractInfoBatch
* Content-Type: application/json
* ボディ（JSON形式）：
  * `chainID` (string) -- the chain id, as a name or number (ie. "1" or "mainnet", "137" or "polygon", etc.)
  * `contractAddresses` (string of strings) -- array of contract addresses

**Example: `GetContractInfoBatch` of some contracts on Polygon using an `AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY`**

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

<CodeGroup>
  ```shell cURL theme={null}
  curl -X POST -H "Content-Type: application/json" -H "X-Access-Key: AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY" https://metadata.sequence.app/rpc/Metadata/GetContractInfoBatch -d '{ "chainID": "polygon", "contractAddresses": ["0x631998e91476DA5B870D741192fc5Cbc55F5a52E", "0x17b66009af459dc8ebf37acf8a8b355379be2fe5", "0x2791bca1f2de4661ed88a30c99a7a9449aa84174", "0x2953399124f0cbb46d2cbacd8a89cf0599974963", "0x7227e371540cf7b8e512544ba6871472031f3335", "0x7c0ebabfc394ec6d926e801fe0e69a1f15a7fe4d", "0x8f3cf7ad23cd3cadbd9735aff958023239c6a063", "0xa1c57f48f0deb89f569dfbe6e2b7f46d33606fd4"] }'
  ```

  ```ts Typescript theme={null}
  // Works in both a Webapp (browser) or Node.js:
  import { SequenceMetadata } from '@0xsequence/metadata'

  const metadataClient = new SequenceMetadata("https://metadata.sequence.app", "AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY")

  const contractMetadata = await metadataClient.getContractInfoBatch({
    chainID: 'polygon',
    contractAddresses: [
      '0x631998e91476DA5B870D741192fc5Cbc55F5a52E',
      '0x17b66009af459dc8ebf37acf8a8b355379be2fe5',
      '0x2791bca1f2de4661ed88a30c99a7a9449aa84174',
      '0x2953399124f0cbb46d2cbacd8a89cf0599974963',
      '0x7227e371540cf7b8e512544ba6871472031f3335',
      '0x7c0ebabfc394ec6d926e801fe0e69a1f15a7fe4d',
      '0x8f3cf7ad23cd3cadbd9735aff958023239c6a063',
      '0xa1c57f48f0deb89f569dfbe6e2b7f46d33606fd4'
    ]
  })

  console.log('Contract info for above addresses:', contractMetadata)
  ```

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

  seqMetadata := metadata.NewMetadata("AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY")

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

  ```shell Other theme={null}
  Please contact our team for assistance with integrations to another target.
  ```
</CodeGroup>

## Contract-level Metadata Standards

Additionally, OpenSea added something called `contractURI` ([https://docs.opensea.io/docs/contract-level-metadata](https://docs.opensea.io/docs/contract-level-metadata)).

## Search Contract Metadata

### Fetch contract-level info metadata for any ERC20, ERC721 or ERC1155 contract address based on a search criteria

*Sequence Metadata `SearchContracts` Method:*

* Request: POST /rpc/Metadata/SearchContracts
* Content-Type: application/json
* ボディ（JSON形式）：
  * `chainID` **optional**  (string) -- the chain id, as a number (ie. "1" for "mainnet", "137" for "polygon", etc.)
  * `chainIDs` **optional** (string) -- a list of chain ids, as a number (ie. "1" for "mainnet", "137" for "polygon", etc.)
  * `q` (string) -- either a search parameter to search contarct info, or, plainly a contract address to search for

<br />

**Example: `SearchContracts` of some queries / a contract on Polygon using an `AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY`**

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

<CodeGroup>
  ```shell cURL theme={null}
  curl -X POST -H "Content-Type: application/json" -H "X-Access-Key: AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY" https://metadata.sequence.app/rpc/Metadata/SearchContracts -d '{ "q": "skyweaver"}'
  ```

  ```ts Typescript theme={null}
  // Works in both a Webapp (browser) or Node.js:
  import { SequenceMetadata } from '@0xsequence/metadata'

  const metadataClient = new SequenceMetadata('https://metadata.sequence.app', 'AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY')
      
  const contractAddressSearchMetadata = await metadataClient.searchContracts({
      chainIDs: ['137'],
      q: '0x631998e91476DA5B870D741192fc5Cbc55F5a52E',
  })

  console.log('Contract info metadata for above address:', contractAddressSearchMetadata)

  const contractQuerySearchMetadata = await metadataClient.searchContracts({
      chainIDs: ['137'],
      q: 'skyweaver',
  })

  console.log('Contract info metadata for query:', contractQuerySearchMetadata)
  ```

  ```go Go theme={null}

  package main

  import (
  	"context"
  	"fmt"
  	"log"
  	"github.com/0xsequence/go-sequence/metadata"
  )

  func main() {
  	seqMetadata := metadata.NewMetadata("AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY")
  	chainID := "137"

  	contractInfo, _, err := seqMetadata.SearchContracts(context.Background(), "0x631998e91476DA5B870D741192fc5Cbc55F5a52E", &chainID, nil, nil)
  	
  	if err != nil {
  		log.Fatalf("Failed to get contract info: %v", err)
  	}

  	fmt.Printf("Contract Info: %+v\n", contractInfo)
  }
  ```

  ```shell Other theme={null}
  Please contact our team for assistance with integrations to another target.
  ```
</CodeGroup>