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API · /zksync-api

zkSync Era On-Chain API

healthy 3,350 Subscribers

Live zkSync Era on-chain data as an API, built on the open Blockscout explorer. zkSync Era (chain id 324) is a leading Ethereum zk-rollup Layer-2 by Matter Labs; its native currency is ETH and fees are a fraction of mainnet. Pull network stats (total blocks and transactions, ETH price, live gas), a gas oracle with slow, average and fast prices in gwei, the most recent blocks and full block detail by height or hash. Look up any address for its balance and contract status, any transaction by hash for its value, fee, status, sender and receiver, and any ERC-20 token by contract for its name, symbol, decimals, holders and USD rate. A universal search resolves addresses, tokens, blocks and transactions in one call. Real on-chain data, no key needed upstream. Ideal for zkSync wallets, block explorers, gas trackers, DeFi dashboards and on-chain analytics.

#zksync #layer-2 #zk-rollup #ethereum #erc20 #crypto #on-chain
api.oanor.com/zksync-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/zksync-api/openapi.json
/api/zksync-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
391 ms
Server probes · 24h
Subscribers
3,350
active
Total calls
9
last 7 days
status Full status page → · 18 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 8,200 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 8,200 calls/month
  • 2 req/sec
  • Stats + gas + blocks
  • No credit card
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Starter

€4.20 /month

  • 112,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 112k calls/month
  • 8 req/sec
  • Address + tx + token lookup
  • Email support
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Pro

€19.00 /month

  • 615,000 calls / month
  • 25 requests / second
  • Hard cap (429 above quota, no overage)
  • 615k calls/month
  • 25 req/sec
  • zkSync wallets / dashboards
  • Priority support
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Mega

€71.00 /month

  • 2,950,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 2.95M calls/month
  • 50 req/sec
  • DeFi / analytics platform
  • Dedicated SLA
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Built by

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PremiumApi

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Live Arbitrum One on-chain data as an API, built on the open Blockscout explorer. Arbitrum is the largest Ethereum Layer-2 by total value locked (chain id 42161); gas and balances are denominated in ETH and fees are a fraction of mainnet. Pull network stats (total blocks and transactions, ETH price, live gas), a gas oracle with slow, average and fast prices in gwei, the most recent blocks and full block detail by height or hash. Look up any address for its ETH balance and contract status, any transaction by hash for its value, fee, status, sender and receiver, and any ERC-20 token by contract for its name, symbol, decimals, holders and USD rate. A universal search resolves addresses, tokens, blocks and transactions in one call. Real on-chain data, no key needed upstream. Ideal for Arbitrum wallets, block explorers, gas trackers, DeFi dashboards and on-chain analytics.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for zkSync Era On-Chain API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call zkSync Era On-Chain API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for zkSync Era On-Chain API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does zkSync Era On-Chain API cost?
zkSync Era On-Chain API has a free tier with 100 calls / month. Paid plans start at €4.20 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is zkSync Era On-Chain API GDPR-compliant?
All requests to zkSync Era On-Chain API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/zksync-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/zksync-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/zksync-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/zksync-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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