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eip-reference

Provides canonical interfaces, encoding rules, and implementation patterns for Ethereum EIP and ERC standards.

6|20|Updated Mar 14, 2026
Search Tags:#smart contracts#erc-20#solidity#ethereum#eip#account abstraction#eip-712
One-click install
npx skills add https://github.com/andresdefi/cryptoskills --skill eip-reference-andresdefi
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: eip-reference
Source: https://github.com/andresdefi/cryptoskills/tree/main/skills/eip-reference
Command: npx skills add https://github.com/andresdefi/cryptoskills --skill eip-reference-andresdefi

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? AI agents and developers frequently produce incorrect Ethereum code due to stale knowledge of EIP/ERC standards — wrong function signatures, missing chainId in EIP-712 domains, ERC-20 approve race conditions, and confused ERC-4337 gas accounting. This Skill supplies verified interface definitions, behavioral rules, and the common misconceptions that cause bugs. ## Core Features & Use Cases - Canonical Interface Reference: Copy-paste Solidity interfaces for ERC-20, ERC-721, ERC-1155, ERC-4626, ERC-2981, ERC-1271, ERC-4337, and more, with function selectors and ERC-165 interface IDs. - On-Demand Spec Lookup: Fetch any EIP or ERC specification directly from the ethereum/EIPs and ethereum/ERCs GitHub repositories when a standard is not covered inline. - Implementation Patterns & Gotchas: Covers EIP-712 domain separator construction, ERC-2612 permit flows, EIP-7702 delegation, ERC-4337 EntryPoint v0.7, proxy storage slots (EIP-1967), and first-depositor vault attack mitigations. - Use Case: When implementing a gasless token approval, use this Skill to get the correct ERC-2612 permit signature structure, nonce handling, and front-running protections instead of relying on potentially outdated training data. ## Quick Start Ask the agent to show the correct ERC-4626 vault interface and explain the rounding rules for deposit and redeem.

Frequently Asked Questions about eip-reference

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I look up any EIP or ERC specification?▼

Fetch the raw markdown from the ethereum/ERCs repo for application standards (erc-{number}.md) or ethereum/EIPs repo for protocol changes (eip-{number}.md). The Skill provides exact URL patterns and parsing guidance for the spec's frontmatter and sections.

What is the difference between an EIP and an ERC?▼

An EIP covers the entire Ethereum proposal process including protocol-level changes, while an ERC is the subset defining application-layer standards like tokens and signatures. ERC-20 started as EIP-20 and became an ERC upon reaching Final status.

How do I fix the ERC-20 approve race condition?▼

Reset the allowance to zero before setting a new nonzero value, use increaseAllowance/decreaseAllowance, or use ERC-2612 permit. USDT specifically reverts on nonzero-to-nonzero approve, so OpenZeppelin SafeERC20 forceApprove handles this pattern.

Why does my EIP-712 signature fail verification on another chain?▼

The domain separator must include chainId and verifyingContract, and must be recomputed if block.chainid changes after a fork. Hardcoded chainId values in frontend code or cached separators cause cross-chain replay or verification failures.

Does ERC-20 support ERC-165 interface detection?▼

No, ERC-20 predates ERC-165, so most ERC-20 tokens do not implement supportsInterface. Detect ERC-20 tokens with a try/catch call to balanceOf or totalSupply instead of relying on interface detection.

What changed between ERC-4337 EntryPoint v0.6 and v0.7?▼

v0.7 packs gas limits and fees into bytes32 fields, uses a 192-bit key plus 64-bit sequence nonce scheme, and deploys at a new EntryPoint address. Accounts, bundlers, and paymasters cannot mix versions across the two EntryPoints.

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