Free Arc RPC Endpoint
Chain ID 5042 · USDC · multi-region with automatic failover
Arc (Chain ID 5042) is Circle's USDC-native L1, with 500 ms blocks and deterministic finality. Gas is paid in USDC, so fees are denominated in dollars. NodeFlare serves it from its own node.
Public endpoint — no API key
HTTPS
https://rpc.nodeflare.app/arc/publicNeed higher limits? Use a keyed endpoint https://rpc.nodeflare.app/arc/v1/{YOUR_KEY} — get a free key →
Connect to Arc
curl -s -X POST https://rpc.nodeflare.app/arc/public \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'import { ethers } from "ethers";
const provider = new ethers.JsonRpcProvider(
"https://rpc.nodeflare.app/arc/public"
);
const block = await provider.getBlockNumber();import { createPublicClient, http } from "viem";
const client = createPublicClient({
transport: http("https://rpc.nodeflare.app/arc/public"),
});
const block = await client.getBlockNumber();from web3 import Web3
w3 = Web3(Web3.HTTPProvider(
"https://rpc.nodeflare.app/arc/public"
))
print(w3.eth.block_number)Add Arc to your wallet
Network details for MetaMask, Rabby, or any EVM wallet — Arc chain ID 5042 (0x13b2).
| Network name | Arc |
| RPC URL | https://rpc.nodeflare.app/arc/public |
| Chain ID | 5042 |
| Currency symbol | USDC |
| Block explorer | https://explorer.arc.io |
Built for Arc
Stablecoin payments, tokenized-asset settlement, and agents that need dollar-denominated gas. Every request routes to the nearest healthy node, with automatic failover and no per-request throttling — the gaps public endpoints leave.
Dedicated Arc RPC node — your own path, not a shared pool
NodeFlare runs its own dedicated Arc node on bare-metal — not a reseller of Alchemy or Infura, and not a shared free-for-all pool. A free or paid key gives you a dedicated endpoint path with your own rate limits, no per-request throttling, and full access to heavy methods (eth_getLogs, trace_*, debug_*) — your own Arc RPC without running the node yourself.
Arc RPC — FAQ
What is Arc's chain ID?
Arc's chain ID is 5042 (hex 0x13b2). Its native currency is USDC and its block explorer is explorer.arc.io. You can connect with NodeFlare's free public RPC at https://rpc.nodeflare.app/arc/public — no API key required.
How do I add Arc to MetaMask?
In MetaMask, open the network menu → "Add a network" → "Add a network manually", then enter — Network name: Arc; New RPC URL: https://rpc.nodeflare.app/arc/public; Chain ID: 5042; Currency symbol: USDC; Block explorer URL: https://explorer.arc.io. Save, then switch to Arc. The endpoint is free and needs no account.
What is the Arc RPC URL?
NodeFlare's public Arc RPC URL is https://rpc.nodeflare.app/arc/public over HTTPS. No API key is required for the public endpoint.
Is the Arc RPC free?
Yes. The public Arc endpoint is free with no sign-up. A free API key unlocks higher rate limits, heavy methods, and a dedicated path — 2,000,000 compute units per month, no credit card.
What are the Arc RPC rate limits?
The public endpoint is limited to 2 requests/second per IP. A free key gives 10 requests/second; paid plans scale to 500 req/s. Every plan includes all 18 supported chains.
Is NodeFlare a good Arc RPC provider?
NodeFlare is an independent Arc RPC provider that runs its own nodes — not a reseller or aggregator of third-party backends. The public endpoint is free with no sign-up; a free API key adds higher rate limits, and heavy methods (eth_getLogs, trace_*, debug_*) — 2,000,000 compute units per month, no credit card.
Is there a dedicated Arc RPC node?
Yes. NodeFlare runs its own dedicated Arc node(s), and every request is routed to the nearest healthy node with automatic failover. A free or paid key gives you a dedicated endpoint path with your own rate limits and full access to archive methods like eth_getLogs and debug_traceTransaction.
Go deeper
- Full Arc API reference → — supported methods, WebSocket, regions
- Rate limits & compute-unit costs → — what each method costs against your quota
- Pay per request with x402 → — Arc calls in USDC from $0.001, no account:
POST /arc/x402 - RPC for trading bots → and indexers → — low-latency, eth_getLogs-heavy workloads
- Screen a Arc token for scams → — ownership, honeypot check, holder concentration → one risk score
- Onchain tools for AI agents → — token-safety, wallet intelligence and RPC over MCP / x402
Build on Arc with a free key
Higher limits, a dedicated path, and automatic failover — every chain included. No credit card.
Get your free API key →Arc RPC methods
Per-method docs for Arc — parameters, compute-unit cost, and copy-paste examples.