Stable RPC — Free Endpoint & Developer Guide

Stable is a stablecoin-focused chain. This guide shows how to connect to a free Stable RPC endpoint on MoltNode — no API key and no signup required.

What is Stable

Stable is a stablecoin-focused, EVM-compatible chain. Because it follows the EVM standard, it works with the same Solidity contracts, Ethereum-style addresses, and developer tooling used across the broader ecosystem, so building on it feels familiar from day one.

For developers, the interface is the standard one: Stable exposes the eth_* JSON-RPC method set and accepts ordinary Ethereum-style accounts and signatures. Its native unit uses the symbol USD, reflecting the chain's stablecoin orientation. Rather than rely on second-hand details, the most reliable way to learn about Stable is to connect a JSON-RPC client to a live endpoint and read directly from the chain — checking the chain ID, block height, and balances yourself.

Stable RPC endpoint on MoltNode

MoltNode gives Stable one clean URL that is also a working RPC endpoint:

https://moltnode.ag/stable

No API key is required and there is no signup. The endpoint speaks JSON-RPC 2.0 over HTTP POST, and CORS is open so browser apps can call it directly without a proxy. The URL behaves two ways: a GET opened in a browser shows a human-readable page about the chain, while a POST with a JSON-RPC body returns a machine response. One address serves both people and programs.

To use the free Stable RPC in a wallet, add a custom network with the RPC URL https://moltnode.ag/stable. You can read the chain ID directly from the endpoint with an eth_chainId call before configuring the rest of the network details.

Probe it with curl

To verify the Stable JSON-RPC endpoint is live, ask for the latest block number:

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

The response is a JSON object with the current block height, hex-encoded, in result. Replace the method with any standard eth_* call — eth_chainId, eth_getBalance, eth_getTransactionReceipt — to read whatever your application needs from the Stable node.

Use it from your app

Any JSON-RPC client connects to the Stable RPC endpoint. Here is a minimal viem example pointed at the URL:

import { createPublicClient, http } from "viem";

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

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

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

Reliability & failover

Behind the single moltnode.ag/stable URL is MoltNode's upstream routing layer, built for automatic failover. If an upstream provider is unavailable or returns an error, requests are routed to the next available source so your application keeps running. The upstream API keys stay server-side and are never exposed to your client, so you get reliable Stable node access without managing any credentials.

There is no hard rate limit, but this is a shared, free resource. Please use it responsibly: cache results where practical, avoid tight polling loops, and for heavy production traffic, treat MoltNode as a fast default and a failover layer rather than your only dependency.

For humans and agents

The dual GET/POST behavior makes the endpoint useful to developers and automated tools alike. You can open https://moltnode.ag/stable in a browser to read about the chain, while a script or wallet POSTs JSON-RPC to the same URL.

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 Stable entry and its endpoint, and begin making eth_* calls without any human in the loop.

Closing

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