// EVM chains (ethers.js)
import { JsonRpcProvider } from 'ethers';
const provider = new JsonRpcProvider(process.env.QUICKNODE_RPC_URL!);

// EVM chains (viem)
import { createPublicClient, http } from 'viem';
import { mainnet } from 'viem/chains';
const client = createPublicClient({
  chain: mainnet,
  transport: http(process.env.QUICKNODE_RPC_URL!),
});

// Solana
import { createSolanaRpc } from '@solana/kit';
const rpc = createSolanaRpc(process.env.QUICKNODE_RPC_URL!);

https://{ENDPOINT_NAME}.{NETWORK}.quiknode.pro/{API_KEY}/

// Get all token balances for an address
const response = await fetch(process.env.QUICKNODE_RPC_URL!, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    method: 'qn_getWalletTokenBalance',
    params: [{ wallet: '0x...', contracts: [] }]
  })
});

// Fetch NFTs owned by address
const response = await fetch(process.env.QUICKNODE_RPC_URL!, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    method: 'qn_fetchNFTs',
    params: [{ wallet: '0x...', page: 1, perPage: 10 }]
  })
});

// Get recommended priority fees
const response = await rpc.request('qn_estimatePriorityFees', {
  last_n_blocks: 100,
  account: 'YOUR_ACCOUNT'
}).send();

// Using Metis - Jupiter Swap API
import { createJupiterApiClient } from '@jup-ag/api';

const jupiterApi = createJupiterApiClient({
  basePath: `${process.env.QUICKNODE_METIS_URL}`
});

const quote = await jupiterApi.quoteGet({
  inputMint: 'So11111111111111111111111111111111111111112',
  outputMint: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',
  amount: 1000000000,
  slippageBps: 50
});

const swapResult = await jupiterApi.swapPost({
  swapRequest: {
    quoteResponse: quote,
    userPublicKey: 'YourPubkey...'
  }
});

// Get all assets owned by a wallet
const response = await fetch(process.env.QUICKNODE_RPC_URL, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    jsonrpc: '2.0',
    id: 1,
    method: 'getAssetsByOwner',
    params: {
      ownerAddress: 'E645TckHQnDcavVv92Etc6xSWQaq8zzPtPRGBheviRAk',
      limit: 10,
      options: { showFungible: true, showCollectionMetadata: true }
    }
  })
});
const { result } = await response.json();
// result.total — total assets
// result.items — array of asset metadata
// result.cursor — for pagination

import Client, { CommitmentLevel } from "@triton-one/yellowstone-grpc";

// Derive from HTTP URL: https://example.solana-mainnet.quiknode.pro/TOKEN/
const client = new Client(
  "https://example.solana-mainnet.quiknode.pro:10000",
  "TOKEN",
  {}
);

const stream = await client.subscribe();
stream.on("data", (data) => {
  if (data.transaction) console.log("Tx:", data.transaction);
});

stream.write({
  transactions: {
    txn_filter: {
      vote: false,
      failed: false,
      accountInclude: ["PROGRAM_PUBKEY"],
      accountExclude: [],
      accountRequired: [],
    },
  },
  accounts: {},
  slots: {},
  blocks: {},
  blocksMeta: {},
  transactionsStatus: {},
  entry: {},
  accountsDataSlice: [],
  commitment: CommitmentLevel.CONFIRMED,
});

npm install @quicknode/sdk

import { Core } from '@quicknode/sdk';

const core = new Core({
  endpointUrl: process.env.QUICKNODE_RPC_URL!,
});

// Token API
const balances = await core.client.qn_getWalletTokenBalance({
  wallet: '0x...',
});

// NFT API
const nfts = await core.client.qn_fetchNFTs({
  wallet: '0x...',
  page: 1,
  perPage: 10,
});

const QN_API_KEY = process.env.QUICKNODE_API_KEY!;

const res = await fetch('https://api.quicknode.com/v0/endpoints', {
  headers: { 'x-api-key': QN_API_KEY },
});
const endpoints = await res.json();

import { wrapFetch } from "@x402/fetch";
import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { base } from "viem/chains";

const account = privateKeyToAccount(process.env.PRIVATE_KEY as `0x${string}`);
const walletClient = createWalletClient({
  account,
  chain: base,
  transport: http(),
});

// Wrap fetch to auto-handle 402 payments
const x402Fetch = wrapFetch(fetch, walletClient);

// Use like normal fetch — payments are handled automatically
const response = await x402Fetch("https://x402.quicknode.com/ethereum-mainnet", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    jsonrpc: "2.0",
    method: "eth_blockNumber",
    params: [],
    id: 1,
  }),
});

import { Core } from '@quicknode/sdk';

const chains = {
  ethereum: new Core({
    endpointUrl: 'https://YOUR_ETH_ENDPOINT.quiknode.pro/KEY/'
  }),
  polygon: new Core({
    endpointUrl: 'https://YOUR_POLYGON_ENDPOINT.quiknode.pro/KEY/'
  }),
  arbitrum: new Core({
    endpointUrl: 'https://YOUR_ARB_ENDPOINT.quiknode.pro/KEY/'
  }),
};

// Use appropriate chain
const ethBalance = await chains.ethereum.client.getBalance({ address: '0x...' });