Etherscan API

Official Ethereum blockchain explorer API for transactions, balances, contract ABI, gas prices, and token transfers.

Status
🟢 Online · 582 ms

30-day uptime
99.71%

Free tier
5 calls/sec, free key, no credit card

Auth
API key

Last 30 days

Free alternatives (live ranking)

Kraken Public API — 🟢 Online · Unlimited public data, no key required
Coinbase Advanced Trade API (Public) — 🟢 Online · 10 calls/sec, no key for public endpoints
Blockchain.com Data API — 🟢 Online · Unlimited, no key, no credit card

Compare Etherscan API with…

Etherscan API vs Kraken Public API — Unlimited public data, no key required
Etherscan API vs Coinbase Advanced Trade API (Public) — 10 calls/sec, no key for public endpoints
Etherscan API vs Blockchain.com Data API — Unlimited, no key, no credit card

Paid alternatives

Etherscan Pro — from $199/mo

Official docs ↗

Frequently Asked Questions

Does Etherscan API require an API key?

Yes, Etherscan API requires a free API key. You can sign up via https://docs.etherscan.io/.

What is Etherscan API's free tier?

5 calls/sec, free key, no credit card

Is Etherscan API currently online?

We check Etherscan API every hour. The current status is shown at the top of this page. You can also see the 30-day uptime history in the chart above.

Implementation notes

When to use Etherscan API

Etherscan is the canonical Ethereum blockchain explorer API for fetching transactions, contract source code, ABI, ENS resolution, and gas oracle data. Use it for any read-only Ethereum analysis where you don't run your own node.

Common pitfalls

Free tier is 5 calls/second and 100,000 calls/day. The per-second limit is strict — a tight loop without delays returns 429 immediately.
Etherscan offers separate APIs per chain (Etherscan for Ethereum, BscScan for BNB Chain, PolygonScan for Polygon, etc.) under the V2 multichain endpoint. Each chain needs its own API key unless you're on a V2 plan.
Contract source code is only available if the contract was verified on Etherscan. Unverified contracts return only bytecode, which is hard to analyze programmatically.

Quick start (bash)

curl "https://api.etherscan.io/api?module=stats&action=ethprice&apikey=YOUR_KEY"

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