Alchemy API

Alchemy is a Web3 dev platform — Ethereum/Polygon/Arbitrum/Optimism/Solana node access + enhanced APIs (NFT, Token, Transfer, etc.).

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Use it when

Enhanced APIs (NFT, Token API) more powerful than standard JSON-RPC

Watch for

Enterprise tier requires payment (Growth from $49/month, Scale thousands)

First check

Sign up at alchemy.com to create an app and get RPC URL. const provider = new ethers.JsonRpcProvider("https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY")

Auth

api_key

CORS

HTTPS

Yes

Signup

Latency

209 ms

Protocol

REST, WebSocket, JSON-RPC

Pricing

freemium

Uptime · 30-day window

Probes: 1Uptime: 100%Avg latency: 209ms

About this API

Alchemy is a Web3 infrastructure company founded 2017. Together with Infura, the two giants of Ethereum node services (others include QuickNode, Ankr). Core function: hosted Ethereum and other EVM chain archive nodes, so dApps don't need to run geth/erigon themselves (self-running requires TBs of disk + ongoing maintenance). Beyond standard JSON-RPC, Alchemy provides "Enhanced APIs" — NFT API (fetch all NFTs in a wallet, search by collection), Token API (ERC-20 balances, prices), Webhooks (contract event push triggers), Transfer API (all past transactions for a wallet). Faster and easier than going through native methods like eth_getLogs. Used heavily by NFT marketplaces, wallet apps, DeFi frontends. Free tier 300M compute units/month works for small projects; commercial $49+/month.

What you can build

1DApp backend RPC node
2NFT marketplace backend
3Wallet cross-chain data queries
4Smart contract event monitoring
5Web3 data indexing

Strengths & limitations

Strengths

Enhanced APIs (NFT, Token API) more powerful than standard JSON-RPC
Stable SLA (institutional 99.99%)
Multi-chain (10+ EVM chains + Solana)

Limitations

Enterprise tier requires payment (Growth from $49/month, Scale thousands)
Some archive data requires Pro/Enterprise

Example request

Generic template — replace <endpoint> with the real path from the docs.

curl https://www.alchemy.com/<endpoint> \
  -H "Authorization: Bearer $API_KEY"
# Some providers use X-Api-Key instead — verify in the docs.

Getting started

Sign up at alchemy.com to create an app and get RPC URL. const provider = new ethers.JsonRpcProvider("https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY")

FAQ

Alchemy vs. Infura?+

Similar positioning; Alchemy's Enhanced APIs are richer (NFT, etc.); Infura is older, simpler pure-node.

What is a compute unit?+

Alchemy's billing unit; each endpoint consumes different CUs. eth_call generally 26 CU. 300M/month ≈ 11M eth_call.

Technical details

CORS: ?HTTPS: YesSignup: ?Open source: No

Auth type: api_key
Pricing: freemium
Rate limit: 免费 300M compute units/月（大概每月 100k 次 eth_call）
Protocols: REST, WebSocket, JSON-RPC
SDKs: javascript, typescript, python
Response time: 209 ms
Last health check: 5/12/2026, 7:36:32 AM