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*   [](/v0.1/)
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*   [Web Loaders](/v0.1/docs/integrations/document_loaders/web_loaders/)
*   Blockchain Data

Blockchain Data
===============

This example shows how to load blockchain data, including NFT metadata and transactions for a contract address, via the sort.xyz SQL API.

You will need a free Sort API key, visiting sort.xyz to obtain one.

tip

See [this section for general instructions on installing integration packages](/v0.1/docs/get_started/installation/#installing-integration-packages).

*   npm
*   Yarn
*   pnpm

    npm install @langchain/openai

    yarn add @langchain/openai

    pnpm add @langchain/openai

    import { SortXYZBlockchainLoader } from "langchain/document_loaders/web/sort_xyz_blockchain";import { OpenAI } from "@langchain/openai";/** * See https://docs.sort.xyz/docs/api-keys to get your free Sort API key. * See https://docs.sort.xyz for more information on the available queries. * See https://docs.sort.xyz/reference for more information about Sort's REST API. *//** * Run the example. */export const run = async () => {  // Initialize the OpenAI model. Use OPENAI_API_KEY from .env in /examples  const model = new OpenAI({ temperature: 0.9 });  const apiKey = "YOUR_SORTXYZ_API_KEY";  const contractAddress =    "0x887F3909C14DAbd9e9510128cA6cBb448E932d7f".toLowerCase();  /*  Load NFT metadata from the Ethereum blockchain. Hint: to load by a specific ID, see SQL query example below.  */  const nftMetadataLoader = new SortXYZBlockchainLoader({    apiKey,    query: {      type: "NFTMetadata",      blockchain: "ethereum",      contractAddress,    },  });  const nftMetadataDocs = await nftMetadataLoader.load();  const nftPrompt =    "Describe the character with the attributes from the following json document in a 4 sentence story. ";  const nftResponse = await model.invoke(    nftPrompt + JSON.stringify(nftMetadataDocs[0], null, 2)  );  console.log(`user > ${nftPrompt}`);  console.log(`chatgpt > ${nftResponse}`);  /*    Load the latest transactions for a contract address from the Ethereum blockchain.  */  const latestTransactionsLoader = new SortXYZBlockchainLoader({    apiKey,    query: {      type: "latestTransactions",      blockchain: "ethereum",      contractAddress,    },  });  const latestTransactionsDocs = await latestTransactionsLoader.load();  const latestPrompt =    "Describe the following json documents in only 4 sentences per document. Include as much detail as possible. ";  const latestResponse = await model.invoke(    latestPrompt + JSON.stringify(latestTransactionsDocs[0], null, 2)  );  console.log(`\n\nuser > ${nftPrompt}`);  console.log(`chatgpt > ${latestResponse}`);  /*    Load metadata for a specific NFT by using raw SQL and the NFT index. See https://docs.sort.xyz for forumulating SQL.  */  const sqlQueryLoader = new SortXYZBlockchainLoader({    apiKey,    query: `SELECT * FROM ethereum.nft_metadata WHERE contract_address = '${contractAddress}' AND token_id = 1 LIMIT 1`,  });  const sqlDocs = await sqlQueryLoader.load();  const sqlPrompt =    "Describe the character with the attributes from the following json document in an ad for a new coffee shop. ";  const sqlResponse = await model.invoke(    sqlPrompt + JSON.stringify(sqlDocs[0], null, 2)  );  console.log(`\n\nuser > ${sqlPrompt}`);  console.log(`chatgpt > ${sqlResponse}`);};

#### API Reference:

*   [SortXYZBlockchainLoader](https://api.js.langchain.com/classes/langchain_document_loaders_web_sort_xyz_blockchain.SortXYZBlockchainLoader.html) from `langchain/document_loaders/web/sort_xyz_blockchain`
*   [OpenAI](https://api.js.langchain.com/classes/langchain_openai.OpenAI.html) from `@langchain/openai`

* * *

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