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permit2

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w3py

0xMaka / w3py

Various DeFi scripts and examples

python ethereum blockchain web3 evm dex eip712 defi uniswap sushiswap flashbots permit2 universalrouter

Updated Aug 11, 2025
Python

romanrakhlin / Permit-Phishing

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

hacking uniswap permit2

Updated Nov 22, 2022
JavaScript

ngduythao / permit2-payment

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.

payment gateway permit2

Updated May 11, 2023
Solidity

saad-s / uniswap-uni-router-permit2

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

uniswap smart-order-router permit2 permit2-sdk

Updated Dec 5, 2023
JavaScript

seabed-labs / pre-authorized-debit

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

token delegate approve solana solana-token solana-program spl-token permit2 solana-subscriptions solana-debits spl-token2022 spl-token-2022 solana-delegate token-approval solana-permit2 multi-delegate

Updated Oct 18, 2023
TypeScript

KennieHarold / permit2-integration

A basic integration of Permit2 using Hardhat

smart-contracts solidity foundry uniswap permit2 harhdat

Updated Jan 31, 2024
TypeScript

CosineLabsHQ / core

The Core Protocol

contracts gasless permit2 eip-2612

Updated Dec 7, 2025
TypeScript

KumaCrypto / permit2-helper

Signature creation helper for Uniswap Permit2

smart-contracts uniswap-v3 permit2 uniswap-library

Updated Apr 8, 2023
TypeScript

felinaprotocol / permit-checker

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

permit permit2 permit-checker erc20-checker-permit erc20-checker permit2-checker

Updated Feb 17, 2024
TypeScript

JanoTheDev / paylix

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.

subscription crypto nextjs ethereum avalanche payments self-hosted polygon agpl anchor billing web3 base foundry optimism solana usdc arbitrum bnb-chain permit2

Updated Jun 2, 2026
Solidity

yan253319066 / XPayLabs-x402-seller

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

middleware express typescript micropayments evm test-server xpay usdc crypto-payments eip-3009 permit2 x402 xpaylabs http-x402

Updated Jun 6, 2026
TypeScript

yan253319066 / XPayLabs-x402

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

typescript sdk coinbase ethereum micropayments web3 evm pay-per-use xpay usdc crypto-payments eip-3009 permit2 http-402 x402 api-payments erc-3009 xpaylabs

Updated Jun 6, 2026
TypeScript

cp0x-org / turbine-api-docs

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

ethereum reverse-engineering api-documentation dex turbine market-making propellerheads defi mev siwe permit2 intent-based-dex

Updated Jun 1, 2026

fomoweth / permit-utils

EIP-2612 and Permit2 signature utilities for Foundry tests

ethereum solidity evm foundry permit permit2 eip-2612

Updated Oct 1, 2025
Solidity

go165 / gpt55-x402-gateway

GPT-5.5 x402 gateway with wallet signing safety, MCP examples, Base USDC payments, merchant readiness and buyer-ready API audit assets

mcp ai-agents eip712 permit2 wallet-security modelcontextprotocol openai-compatible x402 agentic-commerce agentcore base-usdc x402-payments gpt-5-5 cdp-bazaar merchant-readiness signing-safety buyer-ready-api-audit

Updated Jun 18, 2026
JavaScript

onflow / x402-flow-facilitator

x402 payment facilitator for Flow EVM (eip155:747)

flow express typescript blockchain payments micropayments web3 evm stargate stablecoin usdc eip-712 facilitator eip-3009 permit2 eip-1271 viem x402 flow-evm http-payments

Updated Apr 22, 2026
TypeScript

cqlyj / simple-permit2-demo

simple Permit2-based bank contract that demonstrate how Permit2 works

smart-contracts solidity permit2

Updated Feb 24, 2025
Solidity

EricxStone / permit2-sdk

A permit2 SDK fork from Uniswap and get it on Ethers v6

crypto ethereum ethers ethersjs permit2

Updated Sep 5, 2025
TypeScript

fabt31 / base-permit2-helper

Permit2 integration helper for Base L2 — gasless token approvals, signature-based transfers, and batch permit utilities

typescript ethereum base l2 defi uniswap permit2 token-approval

Updated May 11, 2026
TypeScript

ubq-testing / ubq-airdrop-cli

⌨️ CLI tool for parsing all Permit2 payments from all UBQ issues for an upcoming airdrop

portfolio airdrop-automation permit2 ubiquibot

Updated Apr 24, 2024
TypeScript

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