# Alchemy Core Workflow A

> Build a complete wallet portfolio tracker using Alchemy Enhanced APIs. Use when implementing token balance dashboards, NFT galleries, transaction history views, or wallet analytics applications. Trigger: "alchemy wallet tracker", "alchemy portfolio", "alchemy token dashboard", "alchemy transaction history", "build dApp with alchemy".

- Skill: `gabrielmoreira/alchemy-core-workflow-a` (Agent Skill)
- Install (CLI): `npx skillmds@latest add gabrielmoreira/alchemy-core-workflow-a`
- Raw SKILL.md: https://api.skillmd.com/api/skills/gabrielmoreira/alchemy-core-workflow-a/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Data & Analytics
- License: MIT
- Author: gabrielmoreira (https://skillmd.com/u/gabrielmoreira)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/gabrielmoreira/alchemy-core-workflow-a

---

# Alchemy Core Workflow A — Wallet Portfolio Tracker

## Overview

Primary workflow: build a wallet portfolio tracker using Alchemy's Enhanced APIs. Combines `getTokenBalances`, `getNftsForOwner`, `getAssetTransfers`, and token metadata to create a complete wallet view across ERC-20, ERC-721, and ERC-1155 assets.

## Prerequisites

- Completed `alchemy-install-auth` setup
- `alchemy-sdk` installed
- Understanding of Ethereum address format and token standards

## Instructions

### Step 1: Portfolio Data Fetcher

```typescript
// src/portfolio/fetcher.ts
import { Alchemy, Network, AssetTransfersCategory } from 'alchemy-sdk';

const alchemy = new Alchemy({
  apiKey: process.env.ALCHEMY_API_KEY,
  network: Network.ETH_MAINNET,
});

interface TokenHolding {
  contractAddress: string;
  symbol: string;
  name: string;
  balance: number;
  decimals: number;
}

interface NftHolding {
  contractAddress: string;
  collectionName: string;
  tokenId: string;
  name: string;
  imageUrl: string | null;
}

interface WalletPortfolio {
  address: string;
  ethBalance: string;
  tokens: TokenHolding[];
  nfts: NftHolding[];
  recentTransactions: any[];
  fetchedAt: string;
}

async function fetchPortfolio(address: string): Promise<WalletPortfolio> {
  // Parallel fetch all portfolio data
  const [ethBalance, tokenBalances, nftResponse, transfers] = await Promise.all([
    alchemy.core.getBalance(address),
    alchemy.core.getTokenBalances(address),
    alchemy.nft.getNftsForOwner(address, { pageSize: 100 }),
    alchemy.core.getAssetTransfers({
      fromAddress: address,
      category: [
        AssetTransfersCategory.EXTERNAL,
        AssetTransfersCategory.ERC20,
        AssetTransfersCategory.ERC721,
      ],
      maxCount: 25,
      order: 'desc',
    }),
  ]);

  // Resolve token metadata
  const tokens: TokenHolding[] = [];
  for (const tb of tokenBalances.tokenBalances) {
    if (tb.tokenBalance && tb.tokenBalance !== '0x0') {
      const metadata = await alchemy.core.getTokenMetadata(tb.contractAddress);
      const balance = parseInt(tb.tokenBalance, 16) / Math.pow(10, metadata.decimals || 18);
      if (balance > 0.001) {  // Filter dust
        tokens.push({
          contractAddress: tb.contractAddress,
          symbol: metadata.symbol || 'UNKNOWN',
          name: metadata.name || 'Unknown Token',
          balance,
          decimals: metadata.decimals || 18,
        });
      }
    }
  }

  // Map NFTs
  const nfts: NftHolding[] = nftResponse.ownedNfts.map(nft => ({
    contractAddress: nft.contract.address,
    collectionName: nft.contract.name || 'Unknown Collection',
    tokenId: nft.tokenId,
    name: nft.name || `#${nft.tokenId}`,
    imageUrl: nft.image?.cachedUrl || null,
  }));

  return {
    address,
    ethBalance: (parseInt(ethBalance.toString()) / 1e18).toFixed(6),
    tokens: tokens.sort((a, b) => b.balance - a.balance),
    nfts,
    recentTransactions: transfers.transfers,
    fetchedAt: new Date().toISOString(),
  };
}

export { fetchPortfolio, WalletPortfolio };
```

### Step 2: Transaction History Analyzer

```typescript
// src/portfolio/transactions.ts
import { Alchemy, Network, AssetTransfersCategory, SortingOrder } from 'alchemy-sdk';

const alchemy = new Alchemy({
  apiKey: process.env.ALCHEMY_API_KEY,
  network: Network.ETH_MAINNET,
});

async function getTransactionHistory(address: string, maxCount: number = 50) {
  // Get both sent and received transactions
  const [sent, received] = await Promise.all([
    alchemy.core.getAssetTransfers({
      fromAddress: address,
      category: [AssetTransfersCategory.EXTERNAL, AssetTransfersCategory.ERC20],
      maxCount,
      order: 'desc',
    }),
    alchemy.core.getAssetTransfers({
      toAddress: address,
      category: [AssetTransfersCategory.EXTERNAL, AssetTransfersCategory.ERC20],
      maxCount,
      order: 'desc',
    }),
  ]);

  // Merge and sort by block number
  const allTransfers = [
    ...sent.transfers.map(t => ({ ...t, direction: 'sent' as const })),
    ...received.transfers.map(t => ({ ...t, direction: 'received' as const })),
  ].sort((a, b) => parseInt(b.blockNum) - parseInt(a.blockNum));

  return allTransfers;
}

export { getTransactionHistory };
```

### Step 3: Multi-Chain Portfolio Aggregator

```typescript
// src/portfolio/multi-chain.ts
import { Alchemy, Network } from 'alchemy-sdk';

const CHAINS = [
  { name: 'Ethereum', network: Network.ETH_MAINNET },
  { name: 'Polygon', network: Network.MATIC_MAINNET },
  { name: 'Arbitrum', network: Network.ARB_MAINNET },
  { name: 'Optimism', network: Network.OPT_MAINNET },
  { name: 'Base', network: Network.BASE_MAINNET },
];

async function getMultiChainBalances(address: string) {
  const results = await Promise.allSettled(
    CHAINS.map(async (chain) => {
      const client = new Alchemy({
        apiKey: process.env.ALCHEMY_API_KEY,
        network: chain.network,
      });
      const balance = await client.core.getBalance(address);
      const tokens = await client.core.getTokenBalances(address);
      const nonZeroTokens = tokens.tokenBalances.filter(
        t => t.tokenBalance && t.tokenBalance !== '0x0'
      );
      return {
        chain: chain.name,
        nativeBalance: (parseInt(balance.toString()) / 1e18).toFixed(6),
        tokenCount: nonZeroTokens.length,
      };
    })
  );

  return results
    .filter((r): r is PromiseFulfilledResult<any> => r.status === 'fulfilled')
    .map(r => r.value);
}

export { getMultiChainBalances };
```

## Output

- Complete wallet portfolio: ETH + ERC-20 tokens + NFTs
- Transaction history with sent/received classification
- Multi-chain balance aggregation across 5 networks
- Sorted holdings with dust filtering

## Examples

For a development demonstration, call `fetchPortfolio` with a publicly known
test address or an address you control; never request a customer address until
the product’s privacy notice and consent flow are in place. Render the returned
network, timestamp, balances, and token counts, and cache metadata so repeated
page loads do not exhaust the request budget. Verify that a zero-balance
address produces an empty but valid portfolio and that a simulated `429` uses
bounded backoff. If a chain query fails, show that chain as unavailable while
retaining successful chains instead of inventing a consolidated balance.

## Error Handling

| Error | Cause | Solution |
|-------|-------|----------|
| `429 Rate Limit` | Too many metadata calls | Batch with delays or cache metadata |
| Empty token list | Address has no tokens | Verify address is correct |
| Missing NFT images | IPFS gateway timeout | Use Alchemy's cached URL fallback |
| `getAssetTransfers` empty | Wrong category filter | Include all relevant categories |

## Resources

- [Alchemy Enhanced APIs](https://www.alchemy.com/docs)
- [Alchemy NFT API](https://www.alchemy.com/docs/reference/nft-api-quickstart)
- [Alchemy Asset Transfers](https://www.alchemy.com/docs/reference/sdk-getassettransfers)

## Next Steps

For NFT minting and smart contract interaction, see `alchemy-core-workflow-b`.