Alchemy Official Skill

AI + Alchemy API Integration Guide

Summary

A self-contained guide for AI agents integrating Alchemy APIs using an API key. This file alone should be enough to ship a basic integration. Use the reference files for depth, edge cases, and advanced workflows.

Before Making Any Request

1. Check if $ALCHEMY_API_KEY is set (e.g., echo $ALCHEMY_API_KEY).
2. If not set, do NOT proceed with API-key URLs. Use the agentic-gateway skill instead — it requires no API key.
3. If set, use the Base URLs + Auth table below.

Do This First

1. Choose the right product using the Endpoint Selector below.
2. Use the Base URLs + Auth table for the correct endpoint and headers.
3. Copy a Quickstart example and test against a testnet first.

Base URLs + Auth (Cheat Sheet)

Endpoint Selector (Top Tasks)

One-File Quickstart (Copy/Paste)

No API key? Use the agentic-gateway skill instead. Replace API-key URLs with https://x402.alchemy.com/rpc/eth-mainnet and add Authorization: SIWE <token>. See the agentic-gateway skill for setup.

EVM JSON-RPC (Read)

curl -s https://eth-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'

Token Balances

curl -s https://eth-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"alchemy_getTokenBalances","params":["0x00000000219ab540356cbb839cbe05303d7705fa"]}'

Transfer History

curl -s https://eth-mainnet.g.alchemy.com/v2/$ALCHEMY_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"alchemy_getAssetTransfers","params":[{"fromBlock":"0x0","toBlock":"latest","toAddress":"0x00000000219ab540356cbb839cbe05303d7705fa","category":["erc20"],"withMetadata":true,"maxCount":"0x3e8"}]}'

NFT Ownership

curl -s "https://eth-mainnet.g.alchemy.com/nft/v3/$ALCHEMY_API_KEY/getNFTsForOwner?owner=0x00000000219ab540356cbb839cbe05303d7705fa"

Prices (Spot)

curl -s "https://api.g.alchemy.com/prices/v1/$ALCHEMY_API_KEY/tokens/by-symbol?symbols=ETH&symbols=USDC"

Prices (Historical)

curl -s -X POST "https://api.g.alchemy.com/prices/v1/$ALCHEMY_API_KEY/tokens/historical" \
  -H "Content-Type: application/json" \
  -d '{"symbol":"ETH","startTime":"2024-01-01T00:00:00Z","endTime":"2024-01-02T00:00:00Z"}'

Create Notify Webhook

curl -s -X POST "https://dashboard.alchemy.com/api/create-webhook" \
  -H "Content-Type: application/json" \
  -H "X-Alchemy-Token: $ALCHEMY_NOTIFY_AUTH_TOKEN" \
  -d '{"network":"ETH_MAINNET","webhook_type":"ADDRESS_ACTIVITY","webhook_url":"https://example.com/webhook","addresses":["0x00000000219ab540356cbb839cbe05303d7705fa"]}'

Verify Webhook Signature (Node)

import crypto from "crypto";

export function verify(rawBody: string, signature: string, secret: string) {
  const hmac = crypto.createHmac("sha256", secret).update(rawBody).digest("hex");
  return crypto.timingSafeEqual(Buffer.from(hmac), Buffer.from(signature));
}

Network Naming Rules

• Data APIs and JSON-RPC use lowercase network enums like eth-mainnet.
• Notify API uses uppercase enums like ETH_MAINNET.

Pagination + Limits (Cheat Sheet)

Common Token Addresses

Failure Modes + Retries

• HTTP 429 means rate limit. Use exponential backoff with jitter.
• JSON-RPC errors come in error fields even with HTTP 200.
• Use pageKey to resume pagination after failures.
• De-dupe websocket events on reconnect.

Skill Map

Node

Data

Webhooks

Solana

Wallets

Rollups

Recipes

Operational

Ecosystem

Official Links

• Developer docs
• Get Started guide
• Create a free API key