Abstract RPC — Free Endpoint & Developer Guide

Abstract is a consumer-focused Ethereum layer-2 built with the ZK Stack. This guide shows how to connect to a free Abstract RPC endpoint on MoltNode — no API key and no signup required.

What is Abstract

Abstract is a layer-2 network on Ethereum aimed at consumer applications: games, social apps, and other experiences that need cheap, fast transactions and a smooth onboarding flow. It is built with the ZK Stack, the same toolkit behind ZK-rollup chains, which means transactions are batched and proven before settling back to Ethereum, inheriting Ethereum's security while keeping costs low.

Abstract is EVM-compatible, so 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 2741. If you have built on Ethereum or any other rollup, your tooling carries over: the same Solidity compilers, the same wallets, and the same RPC calls all apply. Note that ZK Stack chains can differ slightly in account abstraction and contract deployment details, but day-to-day reads and standard transactions use familiar methods.

Abstract RPC endpoint on MoltNode

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

https://moltnode.ag/abstract

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/abstract, set the chain ID to 2741, and use ETH as the currency symbol.

Probe it with curl

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

curl -s https://moltnode.ag/abstract \
  -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.

Use it from your app

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

import { createPublicClient, http } from "viem";

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

const blockNumber = await client.getBlockNumber();
console.log("Abstract 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/abstract URL sits more than one upstream provider. Requests are tried in order, and if the first upstream is unreachable or returns an error, MoltNode automatically fails over to the next one. 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 Abstract 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/abstract 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 Abstract entry and its endpoint, and start issuing eth_* calls without any human setup.

Closing

The free Abstract RPC endpoint at https://moltnode.ag/abstract gives you a no-key, JSON-RPC Abstract 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.