Chapter · Master Base
Why Layer 2s exist
Ethereum can only fit so many transactions into each block. When lots of people want to use it at the same time, they compete for that limited space by bidding higher fees. During busy periods a simple transfer could cost many dollars, and a complex action could cost far more. This is the traffic jam problem. Layer 2 networks like Base were built to fix it. They handle most of the work off to the side, then report back to Ethereum, so users get much lower fees while still relying on Ethereum for safety.
Free to play. No ads, no token, no account needed to start.
What this lesson covers
Not magic, just clever design
Layer 2s are not free money or a trick. They are a design that moves computation off the crowded main chain while still using it as a court of final record. Base is one flavor of this design. Because it settles to Ethereum, you get most of Ethereum's safety with a fraction of the cost. Next we will look at the specific method Base uses to do this, which is called a rollup.
What you get asked
Why can Ethereum fees get high during busy times?
Each block holds a limited amount of activity. When demand is high, people outbid each other for space, which pushes fees up.
A Layer 2 helps by doing most of the work off to the side, then reporting the results back to ___.
Layer 2s process transactions cheaply, then post data back to Ethereum. That way they inherit Ethereum's strong security.
What is the main benefit of using Base instead of Ethereum directly?
Base gives you cheaper, faster transactions and still posts its data to Ethereum, so it does not have to build security from scratch.
Put the Layer 2 flow in order, from busy Ethereum to a working fix.
Layer 2s take the load off the main chain, then anchor their results to Ethereum, which keeps costs low without giving up safety.
The rest of this chapter
Learn how Base works as Coinbase's Ethereum Layer 2, from rollups and the OP Stack to gas in ETH, bridging, the sequencer, and staying safe.