Free Zircuit RPC Endpoint

Zircuit is a zk-rollup built on OP-Stack-derived infrastructure with one distinctive feature: the sequencer screens every transaction before inclusion. Flagged transactions are quarantined rather than executed — a protocol-level security layer that most rollups don't have. Few independent RPC providers serve Zircuit. NodeFlare runs a dedicated node, so you can start building in under a minute.

Zircuit RPC URLs#

Public endpoint — no API key:

https://rpc.nodeflare.app/zircuit/public

Keyed endpoint (free account — higher limits, heavy methods):

https://rpc.nodeflare.app/zircuit/v1/{YOUR_KEY}

Get your free key → — no credit card.

Quick start#

curl https://rpc.nodeflare.app/zircuit/public \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider(
  'https://rpc.nodeflare.app/zircuit/public'
);
console.log('Zircuit block:', await provider.getBlockNumber());

Zircuit at a glance#

On sequencer quarantine: Zircuit's sequencer validates transactions against known attack patterns before inclusion. If a transaction gets stuck with no obvious gas or nonce reason, it may have been quarantined — a security hold at the protocol level, not a standard revert. This is intentional behavior, not a bug.

Zircuit launched in 2024 and its DeFi ecosystem is still in early growth. That's actually an advantage for indexers and developers: full-history eth_getLogs scans across the entire chain are feasible today in a way they'll never be once the chain matures.

Free tier#

• 2,000,000 compute units/month — no credit card
• eth_getLogs (75 CU), trace_*/debug_* (100 CU) included on free
• Every supported chain under one key — Zircuit, Ethereum, Base, Arbitrum, and more
• Multi-region routing with automatic failover

Add Zircuit to MetaMask#

FAQ#

What is the Zircuit RPC URL? https://rpc.nodeflare.app/zircuit/public — no API key required, rate-limited per IP. A free key unlocks higher limits and heavy methods (eth_getLogs, trace_*, debug_*).

Is the Zircuit RPC free? Yes. The public endpoint is free without sign-up; a free account adds 2M CU/month and a dedicated keyed path.

Does eth_getLogs work on Zircuit? Yes — with a free API key. Zircuit's DeFi ecosystem is still early, so full-history scans are practical; each call costs 75 CU against your monthly quota.

What is Zircuit's sequencer security screening? Zircuit's sequencer checks incoming transactions against known exploit patterns before including them in a block. Transactions that match are quarantined rather than executed — they're held, not reverted. Regular dApp transactions are unaffected; the feature primarily targets MEV attacks and known exploit signatures.

Does Zircuit support WebSocket? Zircuit WebSocket support is on the roadmap. For now, use the HTTPS endpoint above; poll with eth_blockNumber for lightweight head-tracking.

Building on Zircuit? Get your free NodeFlare key → — covers Zircuit plus every supported chain.