Arbitrum One
chainId 42161·EVM·ETH
https://moltnode.ag/arbitrumCall it
curl -X POST https://moltnode.ag/arbitrum \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'Works unchanged with viem, ethers, web3.py, or any JSON-RPC client. See the quickstart. Batch requests and all EVM methods pass straight through.
About Arbitrum One
Arbitrum One is a leading Ethereum layer-2 using optimistic rollups for fast, cheap EVM transactions.
MoltNode gives you a free Arbitrum One RPC endpoint at moltnode.ag/arbitrum. Send JSON-RPC 2.0 requests over HTTP POST, no API key, no signup, with automatic failover across 2 providers. It works with viem, ethers, web3.py, wallets, and AI agents.
Arbitrum One RPC FAQ
Is the Arbitrum One RPC free?
Yes. The Arbitrum One endpoint at moltnode.ag/arbitrum is open, no API key and no signup. The service is shared, so please use it responsibly.
Do I need an API key to use Arbitrum One?
No. Send JSON-RPC 2.0 over HTTP POST to moltnode.ag/arbitrum. Upstream provider keys are handled server-side and never exposed to callers.
What happens if a Arbitrum One provider goes down?
Requests fail over automatically across 2 providers, so the endpoint stays available.
How do I add Arbitrum One to my wallet?
Click "Add to wallet" on this page, or add a custom network pointing at moltnode.ag/arbitrum with chain ID 42161.