The Helius Digital Asset Standard (DAS) API provides powerful tools for reading and querying both NFT and token data on Solana. This guide shows you how to work with different types of Solana assets effectively.

Query NFTs

Retrieve, search, and manage NFT data and collections

Access SPL Tokens

Get token balances, accounts, and holder information

Token Pricing

Access real-time price data for Jupiter verified tokens

API Reference

View detailed API documentation

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Price Data for Jupiter Verified Tokens

Price data returned by getAsset is cached and may not be fresh. The price information has a 60-second cache, meaning the data can be up to 60 seconds old.
const fetchTokenPriceData = async () => {
  const response = await fetch("https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      jsonrpc: "2.0",
      id: "1",
      method: "getAsset",
      params: {
        id: "DezXAZ8z7PnrnRJjz3wXBoRgixCa6xjnB7YaB1pPB263", // Bonk token mint address
        displayOptions: {
          showFungibleTokens: true
        }
      },
    }),
  });
  
  const data = await response.json();
  
  // Calculate market cap
  if (data.result?.token_info?.price_info) {
    const { price_per_token } = data.result.token_info.price_info;
    const { supply, decimals } = data.result.token_info;
    
    // Adjust supply for decimals
    const adjustedSupply = supply / Math.pow(10, decimals);
    const marketCap = price_per_token * adjustedSupply;
    
    console.log(`Market Cap: $${marketCap.toLocaleString()}`);
  }
  
  return data;
};

API Reference

View detailed documentation for getAsset

​
Response Structure

The price data is available in the response under token_info.price_info: 
{
  "token_info": {
    "symbol": "Bonk",
    "supply": 8881594973561640000,
    "decimals": 5,
    "token_program": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA",
    "price_info": {
      "price_per_token": 0.0000192271,
      "currency": "USDC"
    }
  }
}

​
Calculating Market Cap

To calculate a token’s market cap, multiply its price by the adjusted supply (accounting for decimals): 
const adjustedSupply = supply / Math.pow(10, decimals);
const marketCap = pricePerToken * adjustedSupply;
This calculation gives you the total market valuation of the token by properly accounting for the token’s decimal places.

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Working with NFTs and Digital Collectibles

The DAS API offers several methods for working with NFTs and digital collectibles. These methods allow you to retrieve individual assets, query by owner or creator, and verify on-chain authenticity.

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Getting a Single NFT

Retrieve comprehensive data for a specific NFT:

const getNFT = async (mintAddress) => {
  const response = await fetch('https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY', {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      jsonrpc: "2.0",
      id: "1",
      method: "getAsset",
      params: {
        id: mintAddress,
      },
    }),
  });
  
  const data = await response.json();
  return data;
};

// Example usage
getNFT("F9Lw3ki3hJ7PF9HQXsBzoY8GyE6sPoEZZdXJBsTTD2rk");

getAsset

Detailed data for a single asset

getAssetsByOwner

All assets owned by an address

searchAssets

Filter assets by multiple criteria

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Advanced NFT Query Methods

const getAssetsByCreator = async (creatorAddress) => {
  const response = await fetch("https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY", {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      jsonrpc: "2.0",
      id: "1",
      method: "getAssetsByCreator",
      params: {
        creatorAddress: creatorAddress,
        page: 1,
        limit: 100,
      },
    }),
  });
  
  const data = await response.json();
  return data;
};

// Example usage
getAssetsByCreator("9uBX3ASjxWvNBAD1xjbVaKA74mWGZys3RGSF7DdeDD3F");

By Creator

API Reference

By Collection

API Reference

Transaction History

API Reference

On-Chain Proof

API Reference

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Working with SPL Tokens

SPL tokens can be queried through multiple methods in the Helius API. These methods let you check balances, find token accounts, and get token metadata.

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Common SPL Token Operations

const getTokenBalance = async (tokenAccountAddress) => {
  const response = await fetch("https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY", {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      jsonrpc: '2.0',
      id: '1',
      method: 'getTokenAccountBalance',
      params: [tokenAccountAddress]
    })
  });
  
  const data = await response.json();
  return data;
};

// Example usage
getTokenBalance("3emsAVdmGKERbHjmGfQ6oZ1e35dkf5iYcS6U4CPKFVaa");

API Reference

View getTokenAccountBalance documentation

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Advanced SPL Token Queries

You can also find all accounts holding a specific token mint: 
const getTokenAccountsByMint = async (mintAddress) => {
  const response = await fetch("https://mainnet.helius-rpc.com/?api-key=YOUR_API_KEY", {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      jsonrpc: '2.0',
      id: '1',
      method: 'getTokenAccountsByOwner',
      params: [
        'CEXq1uy9y15PL2Wb4vDQwQfcJakBGjaAjeuR2nKLj8dk', // Owner address
        {
          mint: mintAddress
        },
        {
          encoding: 'jsonParsed'
        }
      ]
    })
  });
  
  const data = await response.json();
  return data;
};

// Example usage
getTokenAccountsByMint("8wXtPeU6557ETkp9WHFY1n1EcU6NxDvbAggHGsMYiHsB");

​
Best Practices

When working with the DAS API, keep these best practices in mind:
  1. Use pagination for methods that return large data sets
  2. Handle errors gracefully by implementing try/catch blocks
  3. Cache responses when appropriate to reduce API calls
  4. Respect rate limits to avoid disruptions in your application
  5. Verify Jupiter price data is available before calculating market cap

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Questions?

For frequently asked questions about the DAS API including asset data, price information, and API usage, visit our comprehensive DAS API FAQ.