Avalanche C-Chain RPC — Free Endpoint & Developer Guide

Avalanche C-Chain is the EVM-compatible chain of the Avalanche network of subnets. This guide shows how to connect to it through MoltNode's free Avalanche RPC endpoint — no API key, no signup, just one clean URL.

What is Avalanche C-Chain

Avalanche is a network of interoperable chains, and the C-Chain (Contract Chain) is its EVM-compatible execution layer where smart contracts live. Because the C-Chain runs the EVM, the Solidity contracts, developer tooling, and eth_* JSON-RPC methods you know from Ethereum work here without changes — you deploy the same code and call the same RPC methods against a different network.

The native gas token on the Avalanche C-Chain is AVAX, and its EVM chainId is 43114. The C-Chain hosts a broad ecosystem of DeFi, NFT, and consumer applications, and it sits alongside Avalanche's other chains and subnets in a wider network — but for everyday EVM development, the C-Chain is the chain you target.

Avalanche RPC endpoint on MoltNode

MoltNode gives the Avalanche C-Chain a single, memorable URL:

https://moltnode.ag/avalanche

That URL is a live Avalanche RPC endpoint. There is no API key to manage, no signup, and CORS is open so browser dApps can call it directly. Send standard JSON-RPC 2.0 requests as an HTTP POST with a JSON body and you get JSON-RPC responses back.

The URL is dual-purpose. A GET to https://moltnode.ag/avalanche in a browser returns a human-readable page describing the chain; a POST to the same URL returns machine-readable Avalanche JSON-RPC. One link serves both people and programs.

Quick test with curl

To confirm the free Avalanche RPC is live, request the latest block number with eth_blockNumber:

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

The response is a JSON-RPC object with the current block height as a hex string, like {"jsonrpc":"2.0","id":1,"result":"0x..."}.

Use it from your code

Any Ethereum client works because the endpoint speaks plain JSON-RPC. Point it at the Avalanche node URL and start making calls. Here is a viem example:

import { createPublicClient, http } from "viem";
import { avalanche } from "viem/chains";

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

const block = await client.getBlockNumber();
console.log("Latest Avalanche C-Chain block:", block);

The same URL works with ethers, web3.py, wagmi, or any wallet that supports custom networks — add it with chainId 43114 and symbol AVAX and you are connected.

Reliability & failover

Behind moltnode.ag/avalanche sits a pool of upstream providers tried in order. Requests go first to Alchemy, and if that upstream is unreachable or returns an error, MoltNode automatically fails over to Infura. You never see the switch — you just get an answer. The upstream provider keys live server-side and are never exposed to clients, so you get production-grade infrastructure without ever holding a credential.

There is no hard rate limit, but the endpoint is a shared resource. Please use it responsibly: cache where you can, avoid tight polling loops, and move to a dedicated provider for heavy production workloads. Treating the Avalanche JSON-RPC fairly keeps it fast and free for everyone who relies on it.

For humans and agents

MoltNode is built to be discoverable by both developers and autonomous software. A browser GET on https://moltnode.ag/avalanche renders a readable page; a POST returns Avalanche JSON-RPC. For programmatic discovery, agents and scripts can read the machine-readable catalog at https://moltnode.ag/api/chains to look up Avalanche's slug, chainId, and endpoint, and a plain-text overview lives at https://moltnode.ag/llms.txt. An AI agent can discover the chain, confirm chainId 43114, and start issuing eth_* calls with no human in the loop.

Closing

For a free Avalanche RPC that just works, point your client at https://moltnode.ag/avalanche. No key, no signup, open CORS, and automatic failover across upstreams — whether you are building a dApp with viem, scripting in web3.py, adding a custom network to your wallet, or running an AI agent against the Avalanche C-Chain node.