Uniswap V2 - Flash Swap | DeFi

This is a guide to how to do a simple flash loan on Uniswap V2. The code is written in Solidity.

  • Code 0:15
  • Test 7:13
  • Demo on Ganache 7:53



What is GEEK

Buddha Community

Uniswap V2 - Flash Swap | DeFi
Mikel  Okuneva

Mikel Okuneva


Oracles in DeFi Systems: Off-Chain Aggregation vs Centralized Solutions

DeFi projects are changing the way we’re interacting with digital funds. We’re taking real money and transforming them into digital assets that can be used in blockchain-powered applications. Anyway, as much as we want to think that the cryptocurrency world is one that is separated from the actual real-world, it is not. Otherwise, why are you checking the USD price of your tokens?

We are changing the way we are interacting with each other financially, but we are not changing the way we are interacting with the world. Real-world events are influencing our lives and our digital funds. However, blockchain seems to have its own peace. Yes, the price of a token is going up or down. But one ETH will always be one ETH on its blockchain. A block on the blockchain doesn’t know the time. It’s just a block with a number. But blockchain blocks are generated faster or slower based on the external world miners activity.

#defi #cryptocurrency #crypto #oracles-in-defi #off-chain-aggregating-defi #community-curated-oracle-defi #blockchain-oracles #bridge-defi-provable-defi

Best of Crypto

Best of Crypto


Uniswap Swap Router | Smart Contracts for Swapping on Uniswap V2 & V3

Uniswap Swap Router

This repository contains smart contracts for swapping on the Uniswap V2 and V3 protocols.

Bug bounty

This repository is subject to the Uniswap V3 bug bounty program, per the terms defined here.

Local deployment

In order to deploy this code to a local testnet, you should install the npm package @uniswap/swap-router-contracts and import bytecode imported from artifacts located at @uniswap/swap-router-contracts/artifacts/contracts/*/*.json. For example:

import {
} from '@uniswap/swap-router-contracts/artifacts/contracts/SwapRouter02.sol/SwapRouter02.json'

// deploy the bytecode

This will ensure that you are testing against the same bytecode that is deployed to mainnet and public testnets, and all Uniswap code will correctly interoperate with your local deployment.

Using solidity interfaces

The swap router contract interfaces are available for import into solidity smart contracts via the npm artifact @uniswap/swap-router-contracts, e.g.:

import '@uniswap/swap-router-contracts/contracts/interfaces/ISwapRouter02.sol';

contract MyContract {
  ISwapRouter02 router;

  function doSomethingWithSwapRouter() {
    // router.exactInput(...);


Some tests use Hardhat mainnet forking and therefore require an archive node. Either create a .env file in the workspace root containing:


Or set the variable when running tests:

export ARCHIVE_RPC_URL='...' && npm run test

Download Details:
Author: Uniswap
Source Code: https://github.com/Uniswap/swap-router-contracts
License: GPL-2.0 license

#uniswap #blockchain #ethereum #defi #typescript #solidity

Amara Sophi

Amara Sophi


How to create own defi based protocol like uniswap?

Uniswap Clone Script is ready made script embedded with functions to support margin trading and spot trading for 100+ cryptocurrencies including the widely deployed ERC 20 tokens and ETH. Uniswap exchange clone enables users to seamlessly swap their tokens by connecting the web 3 wallets such as Coinbase wallet, WalletConnect, Formatic, MetaMask, etc.

Ultimate Features of UniSwap Clone Script

Flash Swapping
Token Swapping/Exchange
Price Oracles
Path to Sustainability
Anonymous Trading
Own Custody of Tokens
Flexibility Token Exchanges
Highly Secure
Highly Confidential

Benefits of Uniswap Clone Script

Uniswap exchange clone script promotes your decentralized ethereum based protocol like uniswap. Check the benefits of our uniswap clone below

100% Decentralized Absence of Third Parties
Possible to create exchange for any ERC20 token
Anyone can connect wallet easily to make exchange
Enable your New tokens that can directly access liquidity
Gain more profit by putting funds into the liquidity pool.
Builds affordable liquidity based exchange than other exchanges
Can be expanded/built upon it means custom pools have also be created.
Doesn’t charge any listing fee due to decentralized

Where to create own DeFi Protocol like Uniswap?

Coinjoker is a top leading defi development company experts in creating a decentralized ethereum protocol like uniswap. We create your uniswap clone protocol which is more secure and reliable. It displays your defi based exchange platform with dead-simple UX, earning from trading fees, price determination, historical liquidity, volume and price across across a number of timeframes.

We build you uniswap clone software with the above mentioned functionalities as well as customized option in your exchange platform. We assist you to build your defi protocol like uniswap from the scratch with the bug free solutions and constantly helps you to support and maintenance.

Get A Free Live Demo of >> Uniswap clone script

#uniswap clone #uniswap clone script #uniswap dex clone #create defi protocol like uniswap

Avail Defi wallet development services to ensure efficient fund management

DeFi wallet development services are used for storing the crypto coins and tokens of the users safely. There is no third party involved in the platform. The users need not disclose their personal identity or submit any personal information to register themselves on the wallet. It is non-custodial, easily compatible, utilizes fully encrypted private keys, easy to access, and is completely decentralized. Top-notch security measures are taken to safeguard the users’ funds and data. The different types of DeFi wallets are single-currency, multi-currency, business wallets, web, mobile, hardware, and desktop wallets.

**The typical features of a DeFi wallet are **

Safety measures such as two-factor authentication, biometric authentication, DDoS mitigation, anti-phishing software, SSL implementation, HSM implementation, browser detection security, and multi-signature wallets.
An inbuilt QR code scanner for quick execution of payments.
Whitelisting and blacklisting of wallet addresses.
Merchant integration services.
Seamless integration with numerous payment gateways.
Can be used for the transfer of funds, peer-to-peer payments, preparing invoices, and bill payments.
Is compatible across web, mobile, and desktop.
Protection from inflation, economic downturn, and a market crash,
Auto-denial of duplicate payments helps to prevent chargeback fraud.

Make full use of professional DeFi wallet development services and improve your financial position in no time.

#defi wallet development services, #defi wallet development company, #defi wallet developers, #defi wallet development, #defi wallet development solution, #build your defi wallet,

Best DeFi Projects 2021 | Top DeFi DEX Projects

DeFi DEX Clone Script

BlockchainAppsDeveloper is the leading DeFi DEX Clone Script Development Company, which provides DeFi based Decentralized Exchange Development Services that include exchange, Staking, Yield Farming, Lending & Borrowing development, and more.

FREE DeFi DEX Clone Script Demo

Top 7 DeFi Decentralized Exchanges 2021

In a rapidly developing DeFi market, it’s important to ensure crypto users are trading on a Decentralized based trusted cryptocurrency exchange. Below you can get Top 7 DEX Exchange details.

Pancakeswap Exchange

PancakeSwap Exchange is operated by a single entity. The single entity is corporate and uses decentralized exchanges for cryptocurrency trading. The DEX platform has highly competition with Ethereum decentralized exchanges and works on Binance smart chain blockchain network. Pancakeswap Exchange uses a CAKE token. Ethereum Blockchain may have kickstarted the DeFi trend, but initiatives like PancakeSwap Exchange like platform suggest that the wave of innovation is destined to spread to other blockchain networks.

Thinking to start your own DeFi based DEX exchange on Binance Smart Chain? Read our highly secured and customized Pancakeswap Clone Script features and functionalities.

Get FREE Pancakeswap Clone Script Demo!

Uniswap DEX

Uniswap provides a simple single-click interface to swap any 2 Ethereum assets against an underlying crypto liquidity pool.

Get FREE Uniswap Clone Script Demo!

SushiSwap Exchange

Sushiswap is a decentralized exchange (DEX) where you can swap various tokens/?cryptocurrencies. This is an AMM decentralized exchange running on the Ethereum Blockchain Network. On the main design of the Uniswap Exchange, makers of Sushiswap added community-based trading features to offer further benefits to the crypto traders and investors.

Here you can get a FREE SushiSwap Exchange Clone Script Demo!

KyberSwap Exchange

Kyber Network is a topmost leading liquidity protocol that incentivizes Reserve Managers to significantly contribute to an aggregated pool of liquidity for a pro-rata share of 0.3% crypto trading fees.

Here you can get a FREE KyberSwap Exchange Clone Script Demo!

1inch Exchange

As a Decentralized Exchange (DEX) aggregator, 1inch exchange pulls liquidity from a number of various DEXs to provide limited slippage on large orders. 1inch Exchange permits capital to be pulled in a benefits fashion for the cryptocurrency trader, ultimately providing them the best price for their order.

Here you can get a FREE 1inch Exchange Clone Script Demo!

BakerySwap Exchange

BakerySwap is the 1st-ever made cryptocurrency trading platform on Binance smart chain (BSC). It is also a decentralized protocol and unique token to do the DEXs, which are highly termed as Bake. This was built after the uniswap exchange, which aimed to develop the cryptocurrency trade faster & cheaper.
Here you can get a FREE BakerySwap Exchange Clone Script Demo!

Yearn.Finance Exchange

Yearn Finance is a suite of items in Decentralized Finance that highly offers yield generation, lending aggregation, and insurance on the Ethereum network. The DeFi protocol is maintained by different kind of independent developers and is governed by YFI containers.

Here you can get a FREE Yearn.Finance Exchange Clone Script Demo!

DeFi DEX Development Company - BlockchainAppsDeveloper

BlockchainAppsDeveloper is the leading DeFi Development Company that provides DeFi based Decentralized Exchange (DEX) Development Services that include Exchange, Staking, Yield Farming, Lending & Borrowing development, and more.

Get Instant Quote For DeFi Services

#best defi projects 2021 #top defi dex projects #defi projects 2021 #defi dex development #defi dex