Swellchain RPC — Free Endpoint & Developer Guide

Swellchain is a restaking-focused Ethereum layer-2. This guide shows how to connect to a free Swellchain RPC endpoint on MoltNode — no API key and no signup required.

What is Swellchain

Swellchain is a layer-2 network that settles to Ethereum with a focus on restaking and the liquid-staking ecosystem around it. Like other rollups, it batches transactions off-chain and posts data back to Ethereum, inheriting Ethereum's security while keeping per-transaction costs low. Its restaking orientation makes it a natural home for protocols and applications that build on staked-ETH and restaked assets.

Because Swellchain is EVM-compatible, it speaks the standard eth_* JSON-RPC method set, uses ordinary Ethereum-style addresses, and is identified by an EVM chain ID. The native gas token is ETH, and the chain ID is 1923. If you have built on Ethereum or any other layer-2, your tooling carries over: the same Solidity compilers, the same wallets, and the same RPC calls all apply. Day-to-day reads, balance checks, and standard transactions use the familiar methods you already know.

Swellchain RPC endpoint on MoltNode

MoltNode gives Swellchain one clean URL that is also a live RPC endpoint:

https://moltnode.ag/swell

There is no API key to provision and no account to create. The endpoint speaks JSON-RPC 2.0 over HTTP POST, and CORS is open so browser apps can call it directly. The URL is deliberately dual-purpose: open it with a GET request in a browser and you get a human-readable page describing the chain; send a POST with a JSON-RPC body and you get a machine response. One address serves both audiences.

To add it as a custom network in a wallet, point the network's RPC URL at https://moltnode.ag/swell, set the chain ID to 1923, and use ETH as the currency symbol.

Probe it with curl

The fastest way to confirm the Swellchain JSON-RPC endpoint is live is to ask for the latest block number:

curl -s https://moltnode.ag/swell \
  -X POST \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'

You will get back a JSON object with a hex-encoded block height in the result field. Swap in any other eth_* method — eth_chainId, eth_getBalance, eth_call — to read whatever your app needs from the Swellchain node.

Use it from your app

Any JSON-RPC client works. Here is a minimal example with viem, pointing a custom transport at the free Swellchain RPC:

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://moltnode.ag/swell"),
});

const blockNumber = await client.getBlockNumber();
console.log("Swellchain block:", blockNumber);

The same URL drops into ethers, web3.py, wagmi, or any other library that accepts an HTTP RPC URL — no extra configuration beyond the endpoint itself.

Reliability & failover

Behind the single moltnode.ag/swell URL sits managed upstream infrastructure. Requests are routed to healthy providers, and if an upstream is unreachable or returns an error, MoltNode automatically fails over so your client keeps getting answers. The provider API keys live server-side and are never exposed to your client, so you get the benefit of premium upstreams without managing any credentials yourself.

There is no hard rate limit, but the endpoint is a shared, free resource. Please use it responsibly: cache results where you can, avoid tight polling loops, and if you are running heavy production workloads, treat the Swellchain RPC endpoint as a fast default and a failover rather than a single point of dependence.

For humans and agents

The dual GET/POST behavior makes the endpoint friendly to both people and software. A developer can paste https://moltnode.ag/swell into a browser to read about the chain; a script or wallet POSTs JSON-RPC to the same place.

For automated discovery, MoltNode publishes a machine-readable catalog of every supported chain at https://moltnode.ag/api/chains and an agent-oriented summary at https://moltnode.ag/llms.txt. An AI agent can fetch the catalog, find the Swellchain entry and its endpoint, and start issuing eth_* calls without any human setup.

Closing

The free Swellchain RPC endpoint at https://moltnode.ag/swell gives you a no-key, JSON-RPC Swellchain node that works with viem, ethers, wallets, and AI agents alike — with automatic failover handled for you. Point your client at the URL and start building.