How do I install the Alchemy Install Auth skill?

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jeremylongshore (@jeremylongshore) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Alchemy Install Auth by jeremylongshore

Name: Alchemy Install Auth
Rating: 4.2 (5 reviews)
Author: jeremylongshore

Alchemy Install Auth

Install the Alchemy SDK and configure API key authentication for Web3 development. Use when setting up blockchain API access, creating an Alchemy app, or configuring multi-chain RPC endpoints. Trigger: "install alchemy", "setup alchemy", "alchemy auth", "alchemy API key".

File contents

Alchemy Install & Auth

Overview

Install the alchemy-sdk npm package and configure API authentication. Alchemy provides blockchain infrastructure (RPC nodes, Enhanced APIs, NFT APIs, webhooks) across Ethereum, Polygon, Arbitrum, Optimism, Base, and Solana.

Prerequisites

Node.js 18+ (or Python 3.10+ for alchemy-sdk Python)
Free Alchemy account at alchemy.com
API key from Alchemy Dashboard

Instructions

Step 1: Install the Alchemy SDK

# JavaScript/TypeScript (official SDK)
npm install alchemy-sdk

# Python (community SDK)
pip install alchemy-sdk

Step 2: Create an Alchemy App

Go to dashboard.alchemy.com
Click "Create new app"
Select chain: Ethereum, Polygon, Arbitrum, Optimism, Base, or Solana
Select network: Mainnet, Sepolia (testnet), or Mumbai
Copy the API key

Step 3: Configure Environment

# Set environment variable
export ALCHEMY_API_KEY="your-api-key-here"

# Or create .env file
cat > .env << 'EOF'
ALCHEMY_API_KEY=your-api-key-here
ALCHEMY_NETWORK=ETH_MAINNET
EOF

echo ".env" >> .gitignore

Step 4: Initialize and Verify

// src/alchemy-client.ts
import { Alchemy, Network } from 'alchemy-sdk';

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

// Verify connection
async function verifyConnection() {
  const blockNumber = await alchemy.core.getBlockNumber();
  console.log(`Connected! Latest block: ${blockNumber}`);
  return blockNumber;
}

verifyConnection().catch(console.error);

Step 5: Multi-Chain Configuration

// src/config/chains.ts
import { Alchemy, Network } from 'alchemy-sdk';

// Create clients for multiple chains
const chains = {
  ethereum: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.ETH_MAINNET }),
  polygon: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.MATIC_MAINNET }),
  arbitrum: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.ARB_MAINNET }),
  optimism: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.OPT_MAINNET }),
  base: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.BASE_MAINNET }),
};

export default chains;

Supported Networks

Chain	Network Enum	Mainnet	Testnet
Ethereum	`ETH_MAINNET`	Yes	Sepolia
Polygon	`MATIC_MAINNET`	Yes	Amoy
Arbitrum	`ARB_MAINNET`	Yes	Sepolia
Optimism	`OPT_MAINNET`	Yes	Sepolia
Base	`BASE_MAINNET`	Yes	Sepolia
Solana	`SOL_MAINNET`	Yes	Devnet

Output

alchemy-sdk installed in node_modules
API key configured in environment
Verified connection with latest block number
Multi-chain client configuration ready

Error Handling

Error	Cause	Solution
`Must provide apiKey`	Missing env var	Set `ALCHEMY_API_KEY` in environment
`401 Unauthorized`	Invalid API key	Verify key in Alchemy Dashboard
`429 Rate Limit`	Free tier exceeded	Upgrade plan or reduce request rate
`ECONNREFUSED`	Network blocked	Ensure HTTPS to *.g.alchemy.com allowed

Resources

Next Steps

Proceed to alchemy-hello-world for your first blockchain query.

---name: alchemy-install-authdescription: | Install the Alchemy SDK and configure API key authentication for Web3 development. Use when setting up blockchain API access, creating an Alchemy app, or configuring multi-chain RPC endpoints. Trigger: "install alchemy", "setup alchemy", "alchemy auth", "alchemy API key".allowed-tools: Read, Write, Edit, Bash(npm:*), Bash(pip:*), Grepversion: 1.0.0license: MITauthor: Jeremy Longshore <jeremy@intentsolutions.io>tags: [saas, blockchain, web3, alchemy]compatible-with: claude-code---# Alchemy Install & Auth## OverviewInstall the `alchemy-sdk` npm package and configure API authentication. Alchemy provides blockchain infrastructure (RPC nodes, Enhanced APIs, NFT APIs, webhooks) across Ethereum, Polygon, Arbitrum, Optimism, Base, and Solana.## Prerequisites- Node.js 18+ (or Python 3.10+ for alchemy-sdk Python)- Free Alchemy account at [alchemy.com](https://www.alchemy.com)- API key from Alchemy Dashboard## Instructions### Step 1: Install the Alchemy SDK```bash# JavaScript/TypeScript (official SDK)npm install alchemy-sdk# Python (community SDK)pip install alchemy-sdk```### Step 2: Create an Alchemy App1. Go to [dashboard.alchemy.com](https://dashboard.alchemy.com)2. Click "Create new app"3. Select chain: Ethereum, Polygon, Arbitrum, Optimism, Base, or Solana4. Select network: Mainnet, Sepolia (testnet), or Mumbai5. Copy the API key### Step 3: Configure Environment```bash# Set environment variableexport ALCHEMY_API_KEY="your-api-key-here"# Or create .env filecat > .env << 'EOF'ALCHEMY_API_KEY=your-api-key-hereALCHEMY_NETWORK=ETH_MAINNETEOFecho ".env" >> .gitignore```### Step 4: Initialize and Verify```typescript// src/alchemy-client.tsimport { Alchemy, Network } from 'alchemy-sdk';const alchemy = new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.ETH_MAINNET,});// Verify connectionasync function verifyConnection() { const blockNumber = await alchemy.core.getBlockNumber(); console.log(`Connected! Latest block: ${blockNumber}`); return blockNumber;}verifyConnection().catch(console.error);```### Step 5: Multi-Chain Configuration```typescript// src/config/chains.tsimport { Alchemy, Network } from 'alchemy-sdk';// Create clients for multiple chainsconst chains = { ethereum: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.ETH_MAINNET }), polygon: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.MATIC_MAINNET }), arbitrum: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.ARB_MAINNET }), optimism: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.OPT_MAINNET }), base: new Alchemy({ apiKey: process.env.ALCHEMY_API_KEY, network: Network.BASE_MAINNET }),};export default chains;```## Supported Networks| Chain | Network Enum | Mainnet | Testnet ||-------|-------------|---------|---------|| Ethereum | `ETH_MAINNET` | Yes | Sepolia || Polygon | `MATIC_MAINNET` | Yes | Amoy || Arbitrum | `ARB_MAINNET` | Yes | Sepolia || Optimism | `OPT_MAINNET` | Yes | Sepolia || Base | `BASE_MAINNET` | Yes | Sepolia || Solana | `SOL_MAINNET` | Yes | Devnet |## Output- `alchemy-sdk` installed in node_modules- API key configured in environment- Verified connection with latest block number- Multi-chain client configuration ready## Error Handling| Error | Cause | Solution ||-------|-------|----------|| `Must provide apiKey` | Missing env var | Set `ALCHEMY_API_KEY` in environment || `401 Unauthorized` | Invalid API key | Verify key in Alchemy Dashboard || `429 Rate Limit` | Free tier exceeded | Upgrade plan or reduce request rate || `ECONNREFUSED` | Network blocked | Ensure HTTPS to *.g.alchemy.com allowed |## Resources- [Alchemy Docs](https://www.alchemy.com/docs)- [Alchemy SDK GitHub](https://github.com/alchemyplatform/alchemy-sdk-js)- [Alchemy Dashboard](https://dashboard.alchemy.com)## Next StepsProceed to `alchemy-hello-world` for your first blockchain query.

Frequently asked questions