wtf is parascan?

ParaScan is a free online tool, available at parascan.dev, that checks smart contracts written for Monad, a blockchain network, to see how well they take advantage of running many transactions at the same time. Monad is designed so that transactions which do not depend on each other can process in parallel across many computer cores at once, which is a big part of how it achieves high transaction speeds. The catch is that if two transactions both try to write to the same piece of stored data, they cannot run at the same time and must wait their turn, which slows things down. Many contracts are written in ways that accidentally create this kind of bottleneck without the developer realizing it. You paste in either a live contract address on the network or the raw source code, and ParaScan analyzes it in two ways. First, it reads through the contract's code directly to figure out, in theory, which parts of it are structurally likely to cause conflicts. Second, it watches real activity happening on the live network to measure how much contention is actually occurring in practice. Combining these two views lets it point to the specific named variable in your code that is causing a slowdown, rather than just a generic technical address. The tool then produces a score showing roughly how well a contract parallelizes, flags the exact hotspots causing trouble, and suggests a before and after code fix using your own variable names. There is also an option to have an AI automatically rewrite the problematic code, plus a simulator where you can edit the contract and instantly see the score change to confirm the fix worked. Beyond individual contract analysis, the site runs a live monitor tracking contention across the whole network every thirty seconds, along with a leaderboard of the most congested contracts over the past day. Teams can also plug a scoring check into their automated testing pipeline so that a project fails a review if its score drops too low. The service is entirely free and requires no signup. It is aimed at developers building on Monad who want to understand and fix performance bottlenecks in their smart contracts before they cause problems at scale.