> For the complete documentation index, see [llms.txt](https://sixnetwork.gitbook.io/nft-gen-2-tech-doc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sixnetwork.gitbook.io/nft-gen-2-tech-doc/data-chain-base-uri.md).

# Data-chain Base URI

## Base URI

The URI below is the NFT Collection's baseURI generated from the data chain. The {schemaCode} is the code from the schema that was created.

Testnet endpoint

```bash
# Base URI for testnet
https://six-data-chain-backend-api-gateway-7kl45r91.ts.gateway.dev/api/nft/metadata/schema_code}/{tokenId}

#for example
# https://six-data-chain-backend-api-gateway-7kl45r91.ts.gateway.dev/api/nft/metadata/six_rocket_ticket/1
```

Mainnet endpoint

```bash
# Base URI for mainnet
https://six-data-chain-backend-backend-api-sixnet-gateway-3hi29er0.an.gateway.dev/api/nft/metadata/{schema_code}/{tokenId}

#for example
#https://six-data-chain-backend-backend-api-sixnet-gateway-3hi29er0.an.gateway.dev/api/nft/metadata/six_rocket_ticket/1
```

## OpenSea Metadata Standard (example)

```json
{
  image: "https://ipfs.io/ipfs/QmWzf4885QfDquiPra4CdWz15Wys761jfPrfNNNaQTXtmw/1.png",
  name: "NFT #01",
  description: "This is a description for this NFT series.",
  attributes: [
    {
      trait_type: "Background",
      value: "Red"
    },
    {
      trait_type: "Moon",
      value: "Moon 2"
    },
    {
      trait_type: "Plate",
      value: "Plate 1"
    },
    {
      trait_type: "Tail",
      value: "Tail 2"
    },
    {
      trait_type: "Whale",
      value: "Whale 2"
    }
  ]
}

```

## Error Codes

```typescript
REQUEST_SUCCESS: "V:0001",
INVALID_REQUEST: "V:0099",
DATABASE_ERROR: "V:0103",
MAP_SCHEMA_ERROR:"V:0104", // fail to map schema (schema and nft data not match) 
GET_NFT_DATA_CHAIN_ERROR:"V:0105", // get nft data from chain error
CALL_BASE_URI_IN_SCHEMA_FAIL:"V:0106", // incase call in schema base uri or token uri fail 
```


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