Arbitrum RPC Endpoint

Fast, flat-rate Arbitrum RPC node provider — free tier, no KYC, HTTP & WebSocket.

Arbitrum One is the largest Ethereum optimistic rollup by TVL and transaction count. It runs the Arbitrum Nitro stack, achieves near-instant transaction throughput, and remains highly compatible with EVM contract semantics.

About Arbitrum

Arbitrum was developed by Offchain Labs and launched its mainnet in August 2021. The current Nitro architecture (deployed in 2022) uses WebAssembly to run Geth in fault-proof verification, making Arbitrum the most EVM-equivalent of the major L2s. Block times are ~250ms, with fees typically 10-50x cheaper than Ethereum mainnet.

Arbitrum has a token (ARB) used for governance via the Arbitrum DAO, one of the largest on-chain treasuries in crypto. The chain is the most battle-tested optimistic rollup with billions in TVL across mature DeFi protocols.

Common Use Cases on Arbitrum

• DeFi (GMX, Camelot, Uniswap V3, Aave)
• Perpetual futures and derivatives
• High-frequency trading and MEV
• Onchain games (Treasure DAO ecosystem)
• Layer-3 chains built with Arbitrum Orbit

Arbitrum Ecosystem

GMX (perpetuals), Camelot (DEX), Uniswap V3, Aave V3, Pendle, Radiant, and the Treasure DAO gaming ecosystem. Arbitrum is also the foundation for many L3 chains via Arbitrum Orbit — chains like Xai (gaming) and ApeChain (NFTs).

HTTP Endpoint

WebSocket Endpoint

Quick Start: Connect to Arbitrum

cURL

curl -X POST https://rpc.swiftnodes.io/rpc/arbitrum?key=YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

ethers.js

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider(
  "https://rpc.swiftnodes.io/rpc/arbitrum?key=YOUR_API_KEY"
);

const blockNumber = await provider.getBlockNumber();
console.log("Arbitrum block:", blockNumber);

viem

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/arbitrum?key=YOUR_API_KEY"),
});

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://rpc.swiftnodes.io/rpc/arbitrum?key=YOUR_API_KEY"))
print("Arbitrum block:", w3.eth.block_number)

Add Arbitrum to MetaMask

Bridging to Arbitrum

Official Arbitrum bridge at https://bridge.arbitrum.io for canonical deposits (~10 min) and withdrawals (7 days). Across, Stargate, Hop, and Squid offer fast bridge alternatives.

Features of SwiftNodes for Arbitrum

• Multiple load-balanced upstream nodes for high availability
• Health-checked every 60 seconds with automatic failover
• Free tier available — no credit card or KYC required
• Flat-rate monthly pricing with no per-request fees
• HTTP and WebSocket support
• One API key works across all 75+ supported chains, including Arbitrum

Rate Limits

Frequently Asked Questions: Arbitrum