How to Read a Block Explorer Like a Pro
Block explorers reveal everything happening on a blockchain — if you know what you're looking at. Here's how to actually read transaction details, decode contract calls, and spot the things that matter.
Developer resources
Free RPC guides for Web3 builders
Practical JSON-RPC tutorials, infrastructure deep dives, and shipping notes — built on the same free endpoints you use in production across Ethereum, Base, Polygon, and Arbitrum.
- Free public RPC
- No API key
- Archive included
- 4 EVM chains
Latest guides
Gas Fees Explained: Why a Simple Transfer Sometimes Costs More Than the Crypto You Send
Gas fees are the most confusing part of using crypto. Here's what they are, why they spike, why an L2 transfer is cheap but mainnet sometimes costs $40, and how to time transactions for the lowest cost.
Hard Forks Explained: What Happens to Your Wallet When a Blockchain Upgrades
Every few months, a blockchain you use will go through a hard fork. Here's what that actually means, what happens to your wallet and your assets, and why you almost never need to do anything.
How to Add a Custom RPC to MetaMask (And Why You Should)
MetaMask comes with default RPC endpoints that often slow down, fail, or rate-limit you. Here's how to add a custom RPC in 60 seconds and why it makes your wallet faster and more reliable.
How JSON-RPC Powers Every Web3 App You Use
Every Web3 wallet, dApp, and tool talks to blockchains through JSON-RPC. Here's what that means, how it works, and why understanding it makes you a better Web3 developer.
Why We Launched a Free Public RPC (And How It Stays Free)
rpcfree.com handles 333,000 calls a day across four blockchains, with no API key and no signup. Here's the philosophy, the math, and the infrastructure behind it.