Arc RPC Endpoint

Flat-rate Arc RPC provider and Arc RPC node access: free tier, no KYC, HTTP & WebSocket. Arc mainnet chain ID 5042.

Arc is an EVM-compatible Layer 1 built by Circle and purpose-designed for stablecoin settlement: transaction fees are paid in USDC rather than a volatile native token, and finality is sub-second.

About Arc

Arc went live on public mainnet in September 2026 after roughly a year of testnet operation with institutional participants. Circle pairs a Reth-based EVM execution layer with Malachite BFT consensus to get deterministic, sub-second finality — the property payment systems actually need, as opposed to probabilistic confirmation.

The practical difference for developers is the fee model: you pay gas in USDC, so transaction cost is denominated in dollars instead of fluctuating with a token price. Balances and receipts still behave like any other EVM chain, so existing tooling ports across unchanged.

Common Use Cases on Arc

• Stablecoin payments
• Treasury and FX movement
• Tokenised assets
• Agent-driven payments

Arc Mainnet RPC URL (HTTP)

Arc WebSocket RPC URL

Arc Testnet RPC URL

Same API key, same plan: testnet requests count like any other request.

Quick Start: Connect to Arc

cURL

curl -X POST https://rpc.swiftnodes.io/rpc/arc?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/arc?key=YOUR_API_KEY"
);

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

viem

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

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

Add Arc to MetaMask

Features of SwiftNodes for Arc

• Load-balanced across multiple upstream nodes wherever a chain has more than one, with automatic failover
• Health-checked every 2 minutes 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 131 supported chains and their testnets, including Arc

Rate Limits

Arc guides from the blog

• Arc RPC: A Developer's Guide (Chain ID 5042, USDC Gas)Arc RPC (chain ID 5042) measured: 0.505 s blocks, instant finality, a 20 gwei base fee, 18-decimal native USDC, and two Transfer logs for one ERC-20 transfer.

Related EVM chains

Explore RPC endpoints for other EVM networks on SwiftNodes: