Network & Protocol Guides
Ethereum eth_getLogs: Filtering Event Logs by Address and Topics
Learn how eth_getLogs topic filters work, how to query ERC-20 Transfer events efficiently, and how to avoid common pitfalls.
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Network & Protocol Guides
Reading the Ethereum Mempool: The txpool Namespace and Pending Transactions
Learn how the Ethereum mempool works, how to inspect it with txpool_* RPC methods, and why hosted providers rarely expose it.
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Solana Blockhash Expiry and Durable Nonces: Safe Offline Signing
Why Solana transactions expire via lastValidBlockHeight, and how durable nonces enable safe offline signing.
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Substrate state_getMetadata and Runtime Versions: Querying Chain Metadata at Any Block
Learn how to query Substrate runtime metadata at any block, understand metadata versions, and avoid decoding failures across runtime upgrades.
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Checking Base OP-Stack Node Sync Status via op-node and op-reth Engine/Admin RPC
Learn how to verify Base node sync status using op-node and op-reth Engine/Admin RPC, detect stuck sync, and keep your node at the tip.
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Detecting RPC Node Head Lag and Stale Responses
Learn how to detect if your RPC node is behind the chain tip, measure head lag, and avoid stale responses.
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Ethereum Transaction Tracing: trace_transaction vs debug_traceTransaction and trace_call
Understand Ethereum's trace and debug RPC families, when to use trace_transaction vs debug_traceTransaction, and how to run them.
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Monad Transaction Lifecycle: Asynchronous Execution, Receipt Status, and Ordering
Understand Monad's async execution: how transaction receipts, status, and ordering differ from classic EVM chains, with a polling script.
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Polkadot Finality: GRANDPA Justifications, Finalized Head, and waitForFinalized over JSON-RPC
Learn how Polkadot's GRANDPA finality works and how to query, subscribe, and wait for the finalized head over JSON-RPC to avoid treating un-finalized blocks as permanent.
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Base OP-Stack Finality: Safe, Finalized, and Latest Block Tags over RPC
Understand Base OP-Stack finality stages and how to use safe, finalized, and latest block tags in JSON-RPC calls.
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