Question 1

Sepolia Ethereum RPC: Endpoint Settings, Faucets, and Debugging

Accepted Answer

Sepolia is Ethereum's primary application-development testnet, and connecting to it requires a JSON-RPC endpoint that matches its chain ID (11155111) and supports the methods your tooling calls. This reference covers the exact network settings, how to obtain test ETH, and how to debug the most common Sepolia connection and transaction failures.

It also explains when a public Sepolia endpoint is enough and when a managed or dedicated endpoint makes sense for CI pipelines, indexers, and teams that need predictable throughput.

Question 2

Base Sepolia public RPC endpoint: chain settings, faucet, and debugging

Accepted Answer

Base Sepolia is the testnet for Base, an OP Stack L2 that settles to Ethereum Sepolia. To connect, point your wallet or app at a Base Sepolia RPC endpoint and set chain ID 84532, currency ETH, and explorer https://sepolia.basescan.org. OnFinality provides a public Base Sepolia endpoint at https://base-sepolia.api.onfinality.io/public for development and testing.

Public endpoints are convenient for quick tests, but they are shared and can be rate limited or congested during spikes. For CI pipelines, staging environments, or anything that needs stable throughput, archive data, or WebSocket subscriptions, use a managed RPC API or a dedicated node so your testnet workflow does not depend on a best-effort shared endpoint.

Question 3

Amoy Polygon: What Is It and When Should You Use It?

Accepted Answer

Amoy Polygon is the current Polygon proof-of-stake testnet, replacing the deprecated Mumbai network. It runs the same client stack as Polygon mainnet (Bor and Heimdall) with chain ID 80002 and POL as its native gas token, so contracts and tooling behave almost identically to production. Developers use it to deploy and test smart contracts, indexers, and dApp frontends before shipping to Polygon mainnet.

This page explains what Amoy is, how to connect to it through an RPC endpoint, and how to decide between a public endpoint and managed or dedicated infrastructure. It also covers faucet access, MetaMask network settings, and the failure modes you are most likely to hit when moving from Mumbai to Amoy.

Question 4

Sepolia RPC Endpoint: Public URLs, Chain Settings, and When to Move Off Them

Accepted Answer

A public Sepolia RPC endpoint is a shared, no-signup HTTPS URL that lets you read state and broadcast transactions on the Ethereum Sepolia testnet. It is the fastest way to point a wallet, script, or CI job at Sepolia, but shared capacity and shared rate limits make it a poor fit for anything that needs predictable throughput. This article gives you the chain settings, a working OnFinality public endpoint, and a clear picture of when to switch to a managed or dedicated endpoint.

Question 5

What Is a Solana Devnet Address and How Do You Use One?

Accepted Answer

A Solana devnet address is a public key on the Solana devnet cluster, a test network that mirrors mainnet behavior without using real SOL. You use it to airdrop test SOL, deploy programs, and run transactions before shipping to mainnet. The address format is identical to mainnet, so the only thing that changes is the RPC endpoint your tooling points at.

This article explains how devnet addresses differ from mainnet, how to generate and fund one, how to configure wallets and RPC clients, and how to debug the errors that show up when a devnet address is unfunded or pointed at the wrong cluster.

Question 6

Solana Devnet RPC: Endpoint Settings, Airdrops, and Debugging

Accepted Answer

Solana devnet is the testing cluster where you validate programs, transactions, and client code before touching mainnet. This page explains how to connect a Solana devnet RPC endpoint, how to get test SOL, and how to debug the failures that show up most often during development.

It also covers when a public devnet endpoint is enough and when a managed or dedicated RPC service such as OnFinality is the better fit for CI pipelines, integration tests, and pre-release staging.

Question 7

What is Base Sepolia and when should you use it?

Accepted Answer

Base Sepolia is the testnet for Base, an Ethereum Layer 2 built on the OP Stack. It mirrors Base mainnet's EVM behaviour with chain ID 84532 and test ETH, so you can deploy contracts, test transactions, and rehearse upgrades without touching real funds. It is the standard staging environment for teams building on Base.

For development you can connect to a public endpoint or a managed RPC service. OnFinality provides a Base Sepolia RPC endpoint and dedicated node options, so you can move from a shared public endpoint to isolated infrastructure as your test workload grows.

Question 8

Sepolia Public RPC Endpoint: Chain Settings, Faucet, and Debugging

Accepted Answer

A Sepolia public RPC endpoint is a shared, no-signup HTTP URL that lets you read chain state and broadcast test transactions on the Ethereum Sepolia testnet. It is the fastest way to point a wallet, Hardhat, Foundry, or ethers/viem script at Sepolia before you commit to a paid plan.

This page gives you the exact chain settings, a working OnFinality public endpoint, faucet and debugging notes, and a short guide to when a shared endpoint is enough versus when you should move to a dedicated node.

Question 9

BNB Smart Chain Testnet RPC: Chain Settings, Faucet, and Debugging

Accepted Answer

BNB Smart Chain Testnet (chain ID 97) is where you validate contracts, wallets, and indexers before touching mainnet. This page gives you the exact network settings, a working public endpoint, faucet guidance, and the failure modes that waste the most developer time. You will also find a short checklist for deciding when a shared public endpoint is enough and when a dedicated node is the better fit.

Question 10

Arbitrum One Testnet RPC: Which Endpoint Should You Actually Use?

Accepted Answer

Arbitrum One is the mainnet chain (chain ID 42161). The testnet that developers usually mean when they say "Arbitrum One testnet" is Arbitrum Sepolia (chain ID 421614), which uses Sepolia ETH for gas. This page explains the chain settings, how to add the network to a wallet, how to request testnet ETH, and how to debug the errors that show up when a testnet endpoint is misconfigured. It also covers when a shared public endpoint is enough and when a dedicated node or managed RPC API is the better fit for CI pipelines, indexers, and staging environments.

Question 11

How do I connect to the Solana devnet API for testing?

Accepted Answer

The Solana devnet is a public test cluster where developers can deploy and test programs, run transactions, and validate client logic without risking real funds. Connecting to a reliable devnet RPC API is the first step for building and debugging Solana applications.

This guide explains how to configure your Solana tooling for devnet, get test SOL from the faucet, and choose an RPC endpoint that matches your development workflow. Whether you are using the Solana CLI, web3.js, or a custom backend, you will find practical setup steps and troubleshooting tips here.

Question 12

BNB Chain Testnet RPC Endpoint: Chain Settings, Faucet, and Debugging

Accepted Answer

This page explains how to connect to the BNB Chain Testnet (BSC Testnet) using an RPC endpoint. You'll find the official OnFinality public endpoint, chain settings, faucet instructions, and common debugging tips for building and testing dApps on testnet.

API Service

Dedicated Nodes

Enterprise Nodes

Indexer Services

Network Prototyping Tools

Staking & Validators

AI Agent

RPC documentation entries

Sepolia Ethereum RPC: Endpoint Settings, Faucets, and Debugging

Base Sepolia public RPC endpoint: chain settings, faucet, and debugging

Amoy Polygon: What Is It and When Should You Use It?

Sepolia RPC Endpoint: Public URLs, Chain Settings, and When to Move Off Them

What Is a Solana Devnet Address and How Do You Use One?

Solana Devnet RPC: Endpoint Settings, Airdrops, and Debugging

What is Base Sepolia and when should you use it?

Sepolia Public RPC Endpoint: Chain Settings, Faucet, and Debugging

BNB Smart Chain Testnet RPC: Chain Settings, Faucet, and Debugging

Arbitrum One Testnet RPC: Which Endpoint Should You Actually Use?

How do I connect to the Solana devnet API for testing?

BNB Chain Testnet RPC Endpoint: Chain Settings, Faucet, and Debugging

Never Worry about Infrastructure Again

Supported Networks

Product

Company

Resources

Testnet RPC RPC Assistant

RPC documentation entries

Sepolia Ethereum RPC: Endpoint Settings, Faucets, and Debugging

Base Sepolia public RPC endpoint: chain settings, faucet, and debugging

Amoy Polygon: What Is It and When Should You Use It?

Sepolia RPC Endpoint: Public URLs, Chain Settings, and When to Move Off Them

What Is a Solana Devnet Address and How Do You Use One?

Solana Devnet RPC: Endpoint Settings, Airdrops, and Debugging

What is Base Sepolia and when should you use it?

Sepolia Public RPC Endpoint: Chain Settings, Faucet, and Debugging

BNB Smart Chain Testnet RPC: Chain Settings, Faucet, and Debugging

Arbitrum One Testnet RPC: Which Endpoint Should You Actually Use?

How do I connect to the Solana devnet API for testing?

BNB Chain Testnet RPC Endpoint: Chain Settings, Faucet, and Debugging

Never Worry about Infrastructure Again

Supported Networks

Product

Company

Resources