net_listening

net_listening returns a boolean telling you whether the Arbitrum One node behind https://arbitrum.therpc.io/YOUR_API_KEY (chain ID 42161) is actively listening for incoming peer-to-peer connections. Arbitrum One is the Optimistic Rollup that settles to Ethereum and pays gas in ETH; its Nitro nodes gossip the sequencer's transaction feed and L2 blocks over a P2P network, and this method confirms the networking layer is up. It is the lightest possible liveness probe — true means the node's P2P stack is open for connections, false means it is not — and it takes no parameters.

Use cases

• Run a basic node-health check in monitoring scripts — a fast, zero-parameter probe to confirm an Arbitrum One endpoint is responsive.
• Verify connectivity before kicking off automated operations such as batch reads or contract deployments against Arbitrum One, so a dead endpoint fails fast instead of mid-run.

Parameters

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Response

Example request

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "net_listening",
7    "params": [],
8    "id": 1
9  }'

Try it live in the Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• true means the node is listening for connections, not that it currently has any peers or is in sync — pair it with net_peerCount and eth_syncing to confirm the Arbitrum One node is genuinely healthy and caught up.
• Managed RPC providers front your requests with a load-balanced pool, so this often returns true unconditionally regardless of any single backend node's state. Treat it as a coarse signal, not proof that the specific node serving your call is fully operational.

Supported networks

• Mainnet — Chain ID: 42161
• Sepolia — Chain ID: 421614

See also

• net_peerCount
• net_version

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"net_listening","params":[]}'