Arbitrum One RPC URL & Chain ID
33 public endpoints · 19 online at the last check
Arbitrum One is an Ethereum L2 optimistic rollup run on Arbitrum Nitro. Gas is paid in ETH.
Last checked 2 min ago
No project pays to be listed. How we test
On this page
Below are the public Arbitrum One RPC endpoints listed on chainlist.org, re-checked every 5 minutes from our probe server and sorted by current latency. Failed endpoints are collapsed at the bottom.
Public RPCs are free and shared: expect rate limits, no SLA and weaker privacy. For production apps use a dedicated endpoint.
Arbitrum One network details
- Network name
- Chain ID
- Currency symbol
- Fastest RPC now
- Block explorer
- Latest block
- 522,965,774
- Type
- Arbitrum Nitro L2
Public Arbitrum One RPC endpoints
| Endpoint | Latency | Block | Uptime 24h | Privacy |
|---|---|---|---|---|
| 39 ms | 522,965,773 | 100% | No tracking | |
| 40 ms | 522,965,773 | 100% | No tracking | |
| 44 ms | 522,965,773 | 87.2% | Not stated | |
| 71 ms | 522,965,773 | 100% | Tracks | |
| 86 ms | 522,965,773 | 100% | No tracking | |
| 87 ms | 522,965,773 | 89.2% | Tracks | |
| 93 ms | 522,965,773 | 100% | No tracking | |
| 97 ms | 522,965,772 | 100% | No tracking | |
| 110 ms | 522,965,773 | 100% | No tracking | |
| 113 ms | 522,965,772 | 88.5% | Limited | |
| 130 ms | 522,965,772 | 100% | Limited | |
| 139 ms | 522,965,773 | 99.7% | Tracks | |
| 140 ms | 522,965,773 | 100% | No tracking | |
| 173 ms | 522,965,772 | 100% | Not stated | |
| 183 ms | 522,965,773 | 100% | Limited | |
| 185 ms | 522,965,771 | 100% | Limited | |
| 186 ms | 522,965,771 | 100% | Not stated | |
| 241 ms | 522,965,773 | 100% | No tracking | |
| 407 ms | 522,965,774 | 100% | Limited |
Failed at the last check (14)
| Endpoint | Latency | Block | Uptime 24h | Privacy |
|---|---|---|---|---|
| Offline · HTTP 503 | — | 42.7% | No tracking | |
| Offline · HTTP 403 | — | 0% | Limited | |
| Offline · HTTP 429 | — | 37.5% | Limited | |
| Offline · HTTP 429 | — | 0% | No tracking | |
| Offline · You've reached the usage limit for your current plan. To continue with higher li | — | 5.2% | No tracking | |
| Offline · HTTP 429 | — | 0.3% | Tracks | |
| Offline · fetch failed | — | 0% | No tracking | |
| Offline · HTTP 401 | — | 0% | Limited | |
| Failed · HTTP 429 | — | 26% | Limited | |
| Offline · HTTP 429 | — | 19.1% | Limited | |
| Offline · Unexpected token '<', "<!doctype "... is not valid JSON | — | 0% | Limited | |
| Offline · HTTP 502 | — | 0% | No tracking | |
| Offline · HTTP 402 | — | 0% | Not stated | |
| Offline · HTTP 429 | — | 9.7% | Tracks |
Latency: one eth_blockNumber request from our server every 5 minutes. Block: height reported by the endpoint; a minus shows how many blocks it lags behind the fastest one. Privacy: what the operator declares, from chainlist.org.
Connect to Arbitrum One RPC: code examples
curl -X POST https://api.blockvectra.com/v1/arb_mainnet/public \
-H 'Content-Type: application/json' \
-d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'Arbitrum One RPC FAQ
What is the chain ID of Arbitrum One?
Arbitrum One's chain ID is 42161 (hex 0xa4b1). Wallets use it to tell Arbitrum One apart from other networks and to prevent replaying transactions across chains.
Is there a free Arbitrum One RPC?
Yes. We list 33 public Arbitrum One endpoints; 19 answered at the last check. They are free but shared and rate-limited, with no uptime guarantee.
What currency does Arbitrum One use for gas?
Ether (ETH).
How do I add Arbitrum One to MetaMask?
Use “Add to wallet” at the top of this page, or add the network manually with the values in the table under “How to add Arbitrum One to MetaMask”.
HTTPS or WSS — which should I use?
HTTPS for regular requests such as reading balances or sending transactions; WSS keeps a connection open for subscriptions such as new blocks or logs.
Are public RPC endpoints safe?
A public endpoint cannot move your funds, but it can see your IP address and the requests you send. Check the Privacy column: it shows what each operator says it logs, from chainlist.org.
How often are endpoints checked?
Every 5 minutes. We send one eth_blockNumber request to each HTTPS endpoint and record the response time and block height. An endpoint is marked offline after 3 failed checks in a row.
Does any provider pay to be listed?
No. No provider pays to be listed or to change its place in the table; the order is by measured latency.
How to add Arbitrum One to MetaMask
- Open MetaMask, open the network menu and choose “Add a custom network”.
- Copy each value from the table into the form.
- Save, then switch to the new network.
- If balances do not load, try another RPC URL from the list above.
- Network name
- RPC URL
- Chain ID
- Currency symbol
- Block explorer URL
Related networks
Network data: ethereum-lists/chains via chainlist.org (synced Nov 7, 2026). Privacy labels: chainlist.org. Latency and uptime: our own checks every 5 minutes. No provider pays to be listed.
How this page works
Sources: chainlist.org, ethereum-lists/chains. Data as of Nov 7, 2026.
Not affiliated with any project listed. Educational content, not financial advice.