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Step-by-step recipes for reading onchain data: fixing a specific error you hit, or pulling a specific value out of a protocol like Aave, Uniswap, or Chainlink. Copy the snippet, adapt the address, move on.
Aave V3 Health Factor Explained: getUserAccountData, Decimals, and the Infinite Health Case
Decode Aave V3's getUserAccountData correctly: six struct fields, three decimal scales, and why a zero-debt wallet returns a healthFactor near 1.16e59.
Using Chainlink Price Feeds Correctly: Staleness, Sequencer Uptime, and Decimals
The three checks a Chainlink price feed integration needs to be correct: staleness against the heartbeat, Base sequencer uptime, and decimals normalization without hardcoding 8.
Fixing "could not decode result data (value="0x")" in Ethers and Viem
Ethers and viem throw could not decode result data (value=0x) for four real reasons, from unresolved proxies to wrong chains. Diagnose each one and fix it fast.
ERC-8004 Explained: Query Onchain AI Agent Identity and Reputation with a REST Call
ERC-8004 gives AI agents a portable onchain identity and reputation record. Query the live Identity and Reputation registries with evmquery — no ABI, no SDK.
Why Your eth_call Loop Hits 429s (and How Multicall3 Fixes It)
A loop of eth_call calls works fine in dev, then throws 429 in production. Here's the real free-tier RPC limit behind it, and how Multicall3 fixes it.
Uniswap V3 Pool Data Without the SDK: Price, Liquidity, and Fees in One REST Call
Read sqrtPriceX96, tick, liquidity, and fee tier from any Uniswap V3 pool with a single POST request. No SDK, no ABI files, no RPC provider required.
Multi-Wallet ERC-20 Balance Scanning from TypeScript: No ABIs, No RPC, No Viem
Scan ERC-20 token balances for many wallets, across Ethereum, Base, BNB Chain, and Polygon, using TypeScript fetch. No Viem, no ABI files, no RPC provider needed.
Blockchain Monitoring in Python: Poll EVM Contract State Without the Boilerplate
How to write a Python script that polls EVM contract state (Aave health factors, ERC-20 balances, multi-wallet checks) using evmquery's REST API. No ABIs, no ABI decoders, no Multicall3 setup.
Blockchain Indexers in 2026: The Graph, Goldsky, and When to Skip the Index Entirely
When The Graph wins and when a direct contract query is faster. A practical guide to blockchain indexers with TypeScript examples for ERC-20, Uniswap v3, and DeFi.