6 posts.
Connecting to Arbitrum over WebSocket the same way you connect to Ethereum mainnet will bite you. The sequencer has no public mempool, newHeads is a firehose, and reconnecting isn't enough. Here's what actually breaks and how to handle it.
Read →Every blockchain tutorial says 'connect to an RPC endpoint' and then moves on. Here's what one actually is, what the URL means, how a request works, and when you need a provider — in five minutes.
Read →Multicall3 lives at the same address on every EVM chain and turns 100 contract reads into one RPC call. Here's how it actually works, when to use which variant, and the gotchas that bite people in production.
Read →Your indexer works fine until it hits a single dense block range, then everything stops. Here's the cap mechanics across providers, the adaptive chunking pattern that actually works, and the code to do it right.
Read →Most Solana bots burn 80% of their RPC budget polling for state that WebSocket subscriptions would push to them for free. Here's when to use which, with the commitment-level gotchas that bite people in production.
Read →Most dApps make 50 RPC calls when they could make one. Here's how JSON-RPC batching works, why ethers.js and viem already do most of it for you, and where you still have to think about it.
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