This quickstart demo best serves for server-side use cases given the exposure of your API key. When building a client-side application, it is recommended to keep these API calls in your own internal backend implementation that your frontend calls instead with your own custom authentication.

Automatically mint, update NFT metadata, and batch execute transactions based on offchain events.

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Pre-requisite

In this example, we guide you to mint the NFT Account with custom metadata for each new NFT.

The most common application of this is dynamic onchain membership & loyalty.

The main API route you need is /api/v1/erc721/mint which allows us to set the metadata of a new token in the same request as minting via the metadata field. Starting with the image of the NFT, you first need to store the intended file in the cloud if you have not yet already.

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Upload NFT media (Optional)

This is not required if you already have the url of your media.

For convenience, the ability to upload NFT media is provided out of the box. Using the /api/v1/nft/uploadMedia route, you can provide our file and receive back a mediaUrl.

const formData = new FormData();
formData.append("media", "./path/image");

const response = await fetch("https://groupos.xyz/api/v1/nft/uploadMedia", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.GROUPOS_API_KEY}`,
  },
  body: formData,
})

const imageUrl = await response.json().mediaUrl;

​
Mint NFT with metadata

Now that you’ve stored our image in the cloud, you can mint the NFT. Using the /api/v1/erc721/mint route, you can submit our NFT contract and desired recipient address (e.g. user’s address) and receive back a transaction hash for the pending mint. Depending on your NFT’s network, confirmation can take seconds or minutes.

In JavaScript, calling the API would look like the following:

const nft = {
  chainId: 5, // goerli testnet
  contractAddress: "0x...",
  recipientAddress: "0x...", // account address
  tokenId: 1, // ERC-721 ID
};

const response = await fetch("https://groupos.xyz/api/v1/erc721/mint", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.GROUPOS_API_KEY}`,
  },
  body: {
    chainId: nft.chainId,
    contractAddress: nft.contractAddress,
    recipientAddress: nft.recipientAddress,
    tokenId: nft.tokenId,
  },
})

const transactionHash = await response.json().transactionHash;

​
Confirm

You can query the minted tokens for confirmation. Using the /api/v1/erc721/tokens route, you can query the list of all owners and also tokens for just the latest recipient.

Query minted NFTs

const nft = {
  chainId: 5, // goerli testnet
  contractAddress: "0x...",
  ownerAddress: "0x...", // account address
};

const response = await fetch(
  "https://groupos.xyz/api/v1/erc721/tokens" +
    new URLSearchParams({
      chainId: nft.chainId,
      contractAddress: nft.contractAddress,
      ownerAddress:nft.ownerAddress,
    }),
  {
    method: "GET",
    headers: {
      Authorization: `Bearer ${process.env.GROUPOS_API_KEY}`,
    },
  }
)

const allTokens = await response.json().tokens;

Query an Account address

Assuming that you know the token ID, you then need to query the associated Account address.

const nft = {
  chainId: 5, // goerli testnet
  contractAddress: "0x...",
  id: 1, // token ID
};

const response = await fetch(
  "https://groupos.xyz/api/v1/erc6551/account" +
    new URLSearchParams({
      tokenChainId: nft.chainId,
      tokenContractAddress: nft.contractAddress,
      tokenId: nft.Id,
    }),
  {
    method: "GET",
    headers: {
      Authorization: `Bearer ${process.env.GROUPOS_API_KEY}`,
    },
  }
)

const accountAddress = await response.json().account.contractAddress;
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