Arc RPC Endpoint

Arc mainnet RPC — Chain ID 5042, USDC-native gas, 500 ms blocks. Public endpoint with no API key, or a keyed endpoint on any plan.

Arc is Circle's USDC-native L1. Gas is paid in USDC, blocks arrive every 500 ms, and consensus is Malachite BFT, so a block is final when it is decided. NodeFlare serves Arc from its own node in Frankfurt.

Endpoints

Public — no API key:

https://rpc.nodeflare.app/arc/public

Keyed — higher limits and heavy methods:

https://rpc.nodeflare.app/arc/v1/{YOUR_KEY}

Quick start

Terminal
curl https://rpc.nodeflare.app/arc/public \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}'

Expected: {"jsonrpc":"2.0","id":1,"result":"0x13b2"} — that is 5042, Arc mainnet.

JavaScript
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider(
  'https://rpc.nodeflare.app/arc/public'
);
console.log('Arc block:', await provider.getBlockNumber());

Network details

Chain ID5042 (0x13b2)
Gas tokenUSDC, 18 decimals on the EVM layer
Block time500 ms
Finalitydeterministic, under 1 second
ConsensusMalachite BFT
Explorerexplorer.arc.io

What is different about Arc

Gas is denominated in dollars. A transaction that costs 0.002 USDC costs 0.002 USDC tomorrow as well, which removes the usual step of holding a volatile asset purely to pay for execution.

Finality is deterministic. There is no probabilistic confirmation window and no reorg to design around, so a receipt you have read is a receipt that stands.

The validator set is permissioned. Circle selects who produces blocks. Running a read node, which is what serves this endpoint, requires no permission at all.

Methods

The full eth_, net_ and web3_ surface is available, plus debug_ and trace_ on our node. Compute-unit costs are the same as on every other chain — see rate limits.

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ethers.js