ethereum-rpclisted

**ultrathink** - Blockchain interactions require precision. One wrong hex, one missing zero, and the call fails silently. ## The Vision Make RPC calls foolproof. Validate formats, build correct payloads, and handle responses properly. ## Quick Reference ### Invoke this skill when: - Building `eth_getLogs`, `eth_call`, `eth_getBalance` or any JSON-RPC call - Converting between decimal and hexadecimal for blocks/values - Padding addresses for topics arrays - Debugging RPC errors (code -32000, -32020, etc.) - Working with Hedera, Ethereum, Polygon, or any EVM chain --- ## Core Concepts ### Hexadecimal Encoding Rules | Type | Format | Example | |------|--------|---------| | Block number | `0x` + hex (no leading zeros) | `0x560B8CF` (90,177,743) | | Address | `0x` + 40 hex chars | `0xdAC17F958D2ee523a2206206994597C13D831ec7` | | Address (in topics) | `0x` + 24 zeros + 40 hex | `0x000000000000000000000000dAC17F958D2ee523a2206206994597C13D831ec7` | | Hash (32 bytes) | `0x` + 64 hex chars | `0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef` | | Value (wei) | `0x` + hex | `0xde0b6b3a7640000` (1 ETH) | ### Block Tags | Tag | Description | |-----|-------------| | `latest` | Most recent mined block | | `pending` | Pending state/transactions | | `earliest` | Genesis block | | `safe` | Latest safe head block | | `finalized` | Latest finalized block | --- ## Common RPC Methods ### 1. eth_blockNumber ```json { "jsonrpc": "2.0", "method": "eth_blockNumber",