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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
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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
848 ms
Server probes · 24h
Subscribers
3,350
active
Total calls
81
last 7 days
status Full status page → · 27 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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Related APIs

Other APIs with overlapping tags.

Arbitrum On-Chain API

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.

api.oanor.com/arbitrum-api

Base L2 On-Chain API

Live Base mainnet on-chain data as an API, built on the open Blockscout explorer. Base is Coinbase's Ethereum Layer-2 (chain id 8453), where 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. Real on-chain data, no key needed upstream. Ideal for Base wallets, block explorers, gas trackers, DeFi and on-chain analytics.

api.oanor.com/base-api

Starknet API

Live on-chain data from Starknet, the Ethereum Layer 2 zk-rollup built on the Cairo VM and STARK proofs, via a public Starknet JSON-RPC node. Starknet has no externally-owned accounts: every account is a smart contract with native account abstraction, and fees are paid in STRK or ETH. Resolve an address's transaction nonce, the account contract class it runs and its STRK and ETH balances, read straight from the fee-token contracts. Get a block's number, hash, status, timestamp, sequencer and transaction count. Look up any transaction with its type, finality and execution status, the address that sent it and the actual fee paid. Read the live chain state — the chain id, the JSON-RPC spec version, the latest block and whether the node is syncing. Live, no key, nothing stored. Distinct from the XRP Ledger, Stellar, TRON, Aptos, Algorand, Tezos, Cardano, Hedera, Kaspa, Cosmos, Sui, NEAR, MultiversX, Solana and EVM on-chain APIs and from price feeds — this is Starknet's Cairo-account state, balances, blocks and transactions. Perfect for wallets, explorers and analytics apps.

api.oanor.com/starknet-api

Crypto Treasury API

Live data on the public companies that hold Bitcoin and Ethereum on their balance sheets, from the public CoinGecko feed. Rank every public company by how much of the coin it holds, with current and entry value, average entry price, country and share of total supply; get the aggregate corporate holdings, USD value and market-cap dominance; find a specific holder by name, ticker or country; and compare Bitcoin and Ethereum corporate treasuries side by side. The corporate crypto-treasury layer — distinct from price and exchange feeds: it answers who holds how much, and what they paid. Live, with a short 60-second upstream cache.

api.oanor.com/cryptotreasury-api

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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