菜单
Resolve EVM function selectors (4-byte) and event topic hashes to human-readable signatures. Queries openchain.xyz + 4byte.directory with a built-in fallback DB of 50+ common signatures. Batch mode, bytecode scanning, stdin pipe. Zero dependencies.
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
基于 SOC 职业分类
| name | signature-lookup |
| description | Resolve EVM function selectors (4-byte) and event topic hashes to human-readable signatures. Queries openchain.xyz + 4byte.directory with a built-in fallback DB of 50+ common signatures. Batch mode, bytecode scanning, stdin pipe. Zero dependencies. |
Resolve EVM function selectors and event topic hashes to human-readable signatures. Zero deps.
0xa9059cbb and want to know it's transfer(address,uint256).calldata-decoder (decode full calldata) and event-decoder (decode full event logs).Built-in DB covers 50+ of the most common ERC-20, ERC-721, Uniswap, and access-control signatures, so common lookups work even offline.
lookup.mjs# Single function selector
node lookup.mjs 0xa9059cbb
# Event topic hash
node lookup.mjs 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef
# Batch lookup
node lookup.mjs 0xa9059cbb 0x095ea7b3 0x23b872dd
# Extract and resolve selectors from bytecode
node lookup.mjs --scan 0x6080604052...
# Pipe from stdin
echo "0xa9059cbb 0x095ea7b3" | node lookup.mjs
[fn] 0xa9059cbb transfer(address,uint256) [builtin]
[fn] 0x095ea7b3 approve(address,uint256) [builtin]
[event] 0xddf252ad... Transfer(address,address,uint256) [builtin]
3/3 resolved.
Both APIs are queried in parallel; results are deduplicated.
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