d-xo/weird-erc20 resource

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1707 stars · 219 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A collection of minimal Solidity implementations of ERC20 tokens with unusual or non-standard behavior, based on real tokens that have been exploited in the wild. It serves as a reference for smart contract developers and auditors to understand and test against edge cases in ERC20 token implementations.

Use cases

• test my smart contract against weird ERC20 token behaviors
• learn about ERC20 edge cases and non-standard token implementations
• audit a DeFi protocol for token integration vulnerabilities
• find examples of reentrant ERC20 tokens
• understand why USDT doesn't return a bool on transfer
• build defensive token integration code
• create mock tokens for fuzzing and testing

When to choose

• you are developing or auditing smart contracts that interact with arbitrary ERC20 tokens
• you need realistic mock tokens for testing contract robustness
• you want to learn about historical ERC20 exploits and pitfalls

When to avoid

• you need a production-ready ERC20 token to deploy
• you are looking for a token integration checklist rather than example implementations
• you need a fully-featured testing framework rather than reference examples

Facets

learning-resource · maturity active

security testing developer-tools security blockchain developer-tools tutorials erc20 smart-contracts solidity token-security audit blockchain edge-cases ethereum

Member repositories

For agents

markdown · JSON · MCP: product_card(name="d-xo/weird-erc20")