permit2

Various DeFi scripts and examples

The demonstration of a fake EIP2612 signature for stealing ERC20 tokens with Permit2

Find out exactly why an EIP-712 signature fails.

example usage of uniswap's universal router using smart-order-router sdk and permit2 sdk

A smart contract utilizing the permit2 feature allows users to define and authorize a set of executionss they wish to perform. They can also specify the amount of ERC20 tokens they are willing to pay to relayers for executing these operations.

A public good pre-authorized debit program on Solana. Enables single and recurring scheduled debits from a token account.

A basic integration of Permit2 using Hardhat

The Core Protocol

Community-maintained reference for the Turbine Alpha HTTP API by PropellerHeads

A browser-only ERC20 multisend template powered by Uniswap Permit2.

Efficiently verify ERC20 token 'permit' functions with this TypeScript-based Node.js utility. Supports EIP-1967, OpenZeppelin proxies, and parallel processing.

Signature creation helper for Uniswap Permit2

Seller test server for the x402 protocol — Express middleware demo for testing x402 USDC micropayments. XPay seller endpoint.

EIP-2612 and Permit2 signature utilities for Foundry tests

Buyer SDK for HTTP 402 USDC micropayments — one-line pay() to access any x402-enabled API. XPay protocol client for EVM.

Open-source crypto payments. Gasless one-time + recurring billing on 7 EVM chains (USDC/USDT/WETH/WBTC/DAI/PYUSD via EIP-2612, Permit2, DAI-permit) plus scaffolded Solana/Bitcoin/Litecoin. Non-custodial, self-hostable.

Open-source CLI that inspects EVM transactions for security risks before signing. Flags unlimited approvals, Permit2 grants, NFT operator approvals, proxy upgrades, and more, with text, JSON, and SARIF output.

Pay in USDT without signal. Buyer signs offline; the shop settles later. Self-custody PWA for LATAM.

x402 payment facilitator for Flow EVM (eip155:747)

Serverless backend for Vaultin — SIWE auth, payment requests, and a Uniswap V4 Universal Router calldata engine with atomic Permit2. Python on AWS Lambda.