MathWallet Newsletter 2020.11.27

Dear MathWallet user,

MathWallet has been going well for the past two weeks, here we wish to give you the full update guide for past two weeks.

MathWallet extension wallet already supports Ethereum 2.0 beacon chain KeyPair, which allows users to quickly create KeyPair and browse MATH DApp store to use Eth 2.0 DApps.

MathWallet supports Serum Swap, it is the first mobile wallet to support Serum Swap, users could complete transactions, provide/remove liquidity in Serum Swap.

MathWallet supports dYdX now, users can now immediately trade products such as $BTC $ETH and $LINK with up to 10x leverage.

MathWallet App

MathWallet App supports more than 50 different public chains, including BTC, ETH, Polkadot, Cosmos, Filecoin, Solana etc., is an excellent decentralized wallet, and also supports Cloud Wallet mode.

link:
https://mathwallet.org

1. Optimized Solana Wallet importation
2. Optimized Filecoin transfer fee
3. Solved TRON Wallet problem
4. Supported Korean version news channel
5. Solana is supported by MATH identity

The new guide :

MathWallet Open Source the Substrate web wallet

MathWallet Open Source the Substrate web wallet

Solana Wallet Import Path Support

Solana Wallet Import Path Support

AMA with dYdX: Layer 2 solutions and the future of DeFi

AMA with dYdX: Layer 2 solutions and the future of DeFi

MathWallet extension wallet already supports Ethereum 2.0 beacon chain KeyPair

MathWallet extension wallet already supports Ethereum 2.0 beacon chain KeyPair

Proposal about how to connect DApp with Injected Wallet in Solana

Proposal about how to connect DApp with Injected Wallet in Solana

MathWallet extension wallet supports Ethereum Layer2: Optimistic Ethereum

MathWallet extension wallet supports Ethereum Layer2: Optimistic Ethereum

Math Web Wallet

Math Web Wallet is web version of MathWallet, together with Math extension wallet, you can make a fast and secure transfer and asset query operation.

link:
https://mathwallet.org

1. Supported NEAR Wallet
2. Supported HBTC testnet wallet

Math Extension Wallet

Math Extension Wallet is currently the only multi-chain extension wallet, which has supported more than 50 mainstream public chains, which is especially suitable for professional users and developers.

link:
https://mathwallet.org

1. Supported ETH 2.0 Account System
2. Supported ChainX 2.0 Public chain
3. Supported Helium Account System
4. Supported Optimistic Ethereum Public chain (ETH Layer2)
5. Supported Equilibrium Public chain (Pokaldot)

Math Cloud Wallet

Math Cloud Wallet is the web version of the Cloud Wallet, which ensures assets security, is easy to register and suitable for novices.

Link :
https://cloud.mathwallet.org

1. Launched FIL relevant trading pairs

Math Staking

Participating in the node ecosystem of multiple PoS public chains, MathWallet developed a set of staking tools.

Link :
http://mathwallet.org/staking

Vapor node
– Upgraded to V1.1.7;
FileCoin node
– Upgraded to V1.2.1;

Math VPoS Pool

Virtual Proof of Stake (VPoS) is a new kind of mining pool with multi-crypto supports and rewards.

Link :
https://mathwallet.org/vpos

Math DApp Store

Math DApp Store is a platform for gathering decentralized applications and the entrance for all Dapp users.

Link :
https://mathdapp.store/

From 14th November to 27th November, 40 DApps were added in Math DApp Store.

Solana

SerumSwap Math
The first AMM DEX On Serum

BSC

Unifi Protocol
Decentralized Automated Market Maker (AMM) and token exchange platform

NFT Supermarket
A market made for NFT, where everything is special

Unrekt
Smart Contract Token Allowance Checker for Ethereum and Binance Smart Chain

BSC News
Dynamic news about BSC

Venus
A Decentralized Marketplace for lenders and borrowers

ETH

Scout
Eth2 Deposit Contract data monitor system

Unrekt
Smart Contract Token Allowance Checker for Ethereum and Binance Smart Chain

Snapshot
Off-chain gasless multi-governance client

Alpha Homora
leverages your position in yield farming pools

TrueFi
Uncollateralized lending protocol launched by TrustToken

Math Cloud SWAP

Math Cloud SWAP supports the fast trading of BTC, ETH, EOS, USDT, USDC, TRX, ATOM, MATH, PCX, KSM, DOT, FIL through the aggregation of the depth of exchanges such as Binance, Huobi, and OKEx.

Click Cloud Wallet – Trade

Link :
https://cloud.mathwallet.org/#/

Math Cross-chain SWAP

The cross-chain SWAP in MathWallet is a cross-chain fast exchange service jointly launched by MathWallet and SWFT Blockchain, which supports cross-chain exchange between the following currencies:

BTC、ETH、EOS、ONT、TRX、VET、USDT-ERC20、USDT-TRON、DAI、USDC、PAX、GUSD、TUSD、HUSD、BUSD、MDS、ONG、BTT、HT、BNB、OKB、MATH

Click HD Wallet – Trade

Math News

Math News provides the latest news and price information for all public chains supported by MathWallet.

Link :
http://news.mathwallet.xyz/

MathLabs

MathLabs is an incubator and research center of MathWallet that incubates and produces a variety of projects, tools, and articles.

Link :
http://mathwallet.org/labs/

MathWallet API Documentation

http://doc.mathwallet.org/

MathChain

MathChain is the Polkadot Smart Wallet Parachain based on Substrate.

link:
https://mathchain.org
https://github.com/mathwallet/MathChain

Math Community Activities

Math Show #016 opened at 2020.11.26 at 18:00.The guests are Damien, Dego’s core team, Ryan Fang, Burger’s Founder and COO, Lei Yu, QIAN’s architect, guest host Zhang Shuhao, the executive editor BlockBeats, with the theme of “BSC and its Friends”.

MathWallet has updated the Polkadot Staking tool and the Polkadot Governance tool, the latest version of the tool has supported the re-bond during the DOT unbonding process, as well as the cancellation of governance vote and DOT withdrawl from the vote.

MATH has released the BSC DApp Guide, which is updated about once a week to keep up with the latest developments in BSC DApp. For more information, see :

BSC DApp Guide Series

How to import ChainX 1.0 Wallet into ChainX 2.0 Wallet?

Note: ChainX 2.0 and ChainX 1.0 are two different blockchains. You need to export the private key (which must be a private key) of the 1.0 wallet and then import it into the 2.0 wallet as following steps:

Install the Mathwallet extension wallet

ChainX 2.0 Browser extension User Guide

Import the wallet

Click “+” , select import wallet

Select the private key to import

Enter/paste the private key, select the Edwards(ED25519) encrypted version, and click Next to complete the import.

Note: The mnemonics in ChainX 1.0 wallet will not display the 1.0 address after importing. You can export the private key after importing mnemonics in mobile wallet/web wallet.

 

 

MathWallet extension wallet supports Ethereum Layer2: Optimistic Ethereum

About Optimism Ethereum

Optimism Ethereum would likely be one of the earliest options available in mainnet , and has already attracted support from the two leading project such as Synthetix and Uniswap and wallet service provider such as Coinbase Wallet.

Optimistim launched Optimistic Virtual Machine(OVM), a fully functional execution environment that is fully compatible with the Ethereum Virtual Machine (EVM). OVM is a copy embedded in EVM that allows developers to use the same developer tools and smart contract language such as EVM when using Optimistic Rollup.

Operation guide:

  1. Install MathWallet extension wallet:
    https://mathwallet.org
  2. Switch Network:Optimism Ethereum

3. Click the + sign to create or import a new Key

Click the DAppStore below to find more DApps.

Proposal about how to connect DApp with Injected Wallet in Solana

There are several requirements:

  1. sol-wallet-adapter can be used for both web wallet (ex: sollet.io) and injected wallet (chrome extension & App) so that DApp do not need to change any code for web wallet or injected wallet.

  2. Injected wallet should not block the web wallet, so that user can select the wallet preferred. If only match the injected object window.solana exist, the injected wallet will take control even if the user's selection is a web wallet, and will block the web wallet.

Code PR

https://github.com/project-serum/sol-wallet-adapter/pull/8/files

The mainly change for this PR is to compare:
window.solana.providerUrl.origin === this._providerUrl.origin

window.solana.providerUrl is from the injected wallet.
this._providerUrl is from the DApp fronend.

Only if they are the same, the injected wallet will take control.

Injected Wallet Needs To

Injected wallet does not need to update any code in sol-wallet-adapter.
Injected wallet needs to add below object in their own injected solana object.

For example:
solana.providerUrl = new URL("https://www.mathwallet.org");

DApp Needs To

  1. Install latest version of sol-wallet-adapter
    https://github.com/project-serum/sol-wallet-adapter

  2. Add supported wallet to the wallet list and the url value for injected wallet should match the url provided by injected wallet. (Normally the wallets will submit PR to the DApp repo, and DApp just need to approve the PR)

For example:
https://github.com/mathwallet/oyster-swap/blob/master/src/utils/wallet.tsx

export const WALLET_PROVIDERS = [
{ name: "sollet.io", url: "https://www.sollet.io" },
{ name: "solongwallet.com", url: "http://solongwallet.com" },
{ name: "solflare.com", url: "https://solflare.com/access-wallet" },
{ name: "mathwallet.org", url: "https://www.mathwallet.org" },
];

MathWallet extension wallet already supports Ethereum 2.0 beacon chain KeyPair

Ethereum 2.0 beacon chain phase0 stage is open, you need a beacon chain KeyPair while staking, you can use the Launchpad provide a command-line tool to generate (https://launchpad.ethereum.org/generate-keys), the operation is quite difficult, which is not suitable for entry-level users.

Now you can use MathWallet extension wallet to generate KeyPair for the Ethereum 2.0 beacon chain:

  1. Install MathWallet extension wallet: https://mathwallet.org
  2. Switch Network: ‘Ethereum 2.0’

3. Click the + sign to create or import a new Key

Click the DAppStore below to find more Eth2 apps.

When Ethereum 2.0 opens the money transfer, MaWallet will support it as well.

 

AMA with dYdX: Layer 2 solutions and the future of DeFi

MathWallet hosted AMA in the official Telegram group, and introduced dYdX Exchange which is a decentralized cryptocurrency exchange, built on the Ethereum network.

CEO&Founder of dYdX Antonio Juliano shared his insights about the evolution of DEX and why dYdX could be the go-to DEX for the market.

Host: Yaxin, global marketing director of MathWallet

Guest: Antonio Juliano, Founder and CEO of dYdX

Y: Could you make introduction about yourself and how did you enter into blockchain space and found dYdX?

A: I got into crypto back in 2015 when I was an engineer early on at Coinbase, and then went on to found dYdX in early 2017. At Coinbase I got to work with some of the best people in crypto at the time, and had a great front row seat to seeing all the exciting developments in crypto — especially the launch of Ethereum. Ethereum to me is an entirely new computing paradigm where for the first time you can write programs which execute totally autonomously. I was convinced there would be exciting thing to build on Ethereum and that led me to starting dYdX dYdX is now being built by a team of engineers and operators from top silicon valley tech firms including Coinbase, Google, Uber, Bloomberg, Ripple and more.

Y: How many people in your team? And where is dYdX’s main focus market?

A:Currently there are 12 people on the dYdX team with 7 engineers (including myself ). dYdX has products available in most markets around the world, but we’re especially starting to focus on the Asia, and more specifically China market as obviously crypto trading (especially in derivatives) is very big there and we think DEXs like dYdX can help improve on existing exchanges there

Y: Can you explain briefly what is perpetual trading and how does it generate 50M USD trading volume for dYdX within just few month this year?

A: Perpetuals are synthetic contracts that use a mechanism called a funding rate (basically a dynamic interest rate) paid between longs and shorts to create a product that tracks the price of another asset (eg BTC or ETH). Perpetuals are the largest synthetic product traded on cryptocurrencies. Trading volume for perpetuals is more than the entire rest of the crypto market combined.

There’s a few reasons perpetuals are so popular, and are a great fit for more advanced crypto traders:

— Perpetuals can be traded with leverage — multiplying gains and losses by traders, and dramatically improving capital efficiency

— Perpetuals let users go long or short

— Perpetuals are synthetic, meaning they don’t require the asset being traded to be held by the exchange. This makes it easy for exchanges to support many assets through perpetuals. This is especially true for DEXs: no cross-chain technology is required since the assets being traded are synthetic

Y: As Layer 2 solution aims to solve many scaling and security issue in blockchain space. Could you briefly explain about layer 2 solutions and how did dYdX build on it?

A: Layer 2 solutions allow DeFi apps to scale much more efficiently and reduce transaction fees paid by users (in addition to providing other benefits). There are many new Layer 2 solutions which are being launched soon. dYdX has partnered with Starkware — the leader in a scalability technology called zero knowledge rollups — to scale our product.

This will lead to a massive improvements in our product for users:

— 100x+ cheaper transaction fees: dYdX fees will now be in line with centralized exchange fees — New markets: we’re targeting launching 25–50 new markets in 2021

— UI improvements: dYdX will feel as good as using a centralized exchange: instant UI, no waiting for transactions to mine. And even better since there’s no sign up required and you can custody your own funds!

— Cross margining: meaning one collateral account can be used to collateralize all products a user wants to trade, vastly improving collateral efficiency especially for market makers Higher leverage: by putting price oracles on layer 2, we will have much more performant index prices allowing us to offer higher leverage

Y: Which project/company do you work closely now? How did dYdX build partnership in the Defi ecosystem so far?

A: Besides Starkware, we work with a couple different wallets directly to ensure a great product experience when using dYdX, and surface dYdX to their users. Like I said dYdX is very excited to be partnering with MathWallet on this.

Additionally, dYdX partners with both MakerDAO and Chainlink as price oracle providers — which are the two highest quality price oracle systems available on Ethereum.

Y: We see lot of solid partnership you built up here, it will definitely help dYdX grow stronger, and meanwhile how do you assure the security of trading on dYdX?

A: dYdX is non-custodial, meaning users are in control of their funds while trading — a much more secure way to trade, especially when paired with a hardware wallet. We place huge importance on the security of our smart contracts. Firstly, dYdX is built by world class silicon valley engineers, and has stringent development and testing standards. Our smart contracts have been audited by Open Zeppelin, the world’s leading smart contract security auditors. Most importantly, dYdX has a 3 year history of never losing user funds, and securing billions of dollars that have flowed through our contracts.

Y: As a decentralized trading service provider, could you illustrate what are the benefits of trading on a DEX for your users?

A: 1). Self custody: users always have irrevocable access to their funds. It’s not possible for dYdX to disable withdrawals or freeze/steal user funds. As mentioned, trading on a DEX is a much more secure way to trade!

2). Transparency: all aspects of dYdX are open source and auditable (everything from trade execution to liquidations). Users can just trust our code, not us

3). Access: By operating through Ethereum smart contracts, we can make dYdX available to more people in more places in the world

Y: What is the geographic user distribution of dYdX? Can everyone participate in trading on dYdX?

A: The usage of dYdX is pretty globally distributed right now. Roughly: 35% US, 30% Asia, 25% Europe, 10% Other dYdX is available to most people in most parts of the world, though we do have some products which are unavailable in certain markets (eg perpetuals are not available to us customers)

Y: As part of the Decentralized pionner, how do you predict the future of DEX and DeFi?

A: Eventually I see DEXs and more broadly DeFi becoming the main way people trade and use crypto. There are still some important product and technology challenges that need to be solved to get us there, but I think dYdX and others are pretty close to solving these. After this, I see the huge improvements DEXs offer in security, transparency, and global access driving a continued shift towards DEXs — it’ll be exciting to watch and be a part of over the next few years!

Community questions:

  1. Why do you choose the collaboration with MathWallet and how does the partnership bring into decentralized wallet?

A: MathWallet is obviously one of the leading crypto wallets, and has a great product, which led us to start a partnership with them. We think the partnership will give MathWallet users access to one of the leading DEXs — especially for more advanced products — and will help to distribute dYdX to even more users! We’re also excited to offer MathWallet users a discount on trading fees on dYdX when they use dYdX through MathWallet

2. How did you see the market growth of DEX in China?

A: It’s been great to see the early growth of DEXs in China especially this year, and especially with Uniswap leading the way. I think the evolution of DEXs will mirror the evolution we saw in centralized exchanges: first spot (eg uniswap), then margin and perpetuals (dYdX) Like I said before, perpetuals are really big in China and we think it makes a lot of sense to trade them on a DEX

3. How does dYdX compete with other DEX?

A: The main way dYdX is different than other DEXs is that we offer more advanced products: specifically perpetuals & margin. We also offer a better product experience than other DEXs, and this will be even further improved after our layer 2 launch soon

4. Will you plan to have additional audits at any big next step?

A: We’ll definitely have the new smart contracts for our layer 2 audited before launch!

Follow MathWallet for more future AMA:

Twitter: https://twitter.com/Mathwallet

Telegram: /t.me/mathwallet

Medium: https://mathwallet.medium.com/

Blog: http://blog.mathwallet.org

To experience the dYdX trading and enjoy 10% less fee, enter: https://trade.dydx.exchange/r/mathwallet

MathWallet Open Source the Substrate web wallet

The wallet support all Substrate 2.0 based blockchain, can connect to both PolkadotJS extension and MathWallet extension. It is a simple web wallet focus on assets management.

View balance and transfer.

Screen Shot 2020-11-17 at 15.50.07

Show transaction recrods.

Screen Shot 2020-11-17 at 15.50.17

Switch between different chains including localhost.

Screen Shot 2020-11-17 at 15.50.35

Support multi-languages and multi-currencies.

The open source code can be found at:
https://github.com/mathwallet/math-substrate-web-wallet

If you'd like to add a new chain, please add your chain information to files below and submit a new PR.

/src/router/index.js
/src/store/index.js
/static/js/types.js
/static/js/user.js
/static/js/websockets.js

MathWallet Newsletter 2020.11.13

Dear MathWallet user,

MathWallet has been going well for the past two weeks, here we wish to give you the full update guide for past two weeks.

MathWallet official hope to remind you about MathWallet’s official website: https://www.mathwallet.org. Please do not download “MathWallet” APP in any platform which direct you to third party web page. Recently we have been noticing many cases of scam, please be aware of it.

MathWallet launched FIL Lending tool, user can deposit USDT to borrow 50% equivalent of FIL, current daily interest rate is 0.3%, the loan term is up to 30 days, if user makes the early prepayment, the interest of the remaining loan will be automatically exempted.

Users can participate in Math VPoS mining with MATH HD or Cloud Wallet at an annual rate of up to 30% to 100%.

MathWallet listed Serum Math in DApp store, which is the first mobile wallet to support Serum. Users can receive, trade, and withdraw on Serum DEX in MathWallet App or browser extension wallet.

MathWallet App

MathWallet App supports more than 50 different public chains, including BTC, ETH, Polkadot, Cosmos, Filecoin, Solana etc., is an excellent decentralized wallet, and also supports Cloud Wallet mode.

link:
https://mathwallet.org

1. HD wallet enabled password-free payment for on-chain transfers
2. Optimized Cloud Wallet
3. Adapted to IPhone12

The new guide:

Scam Alert: how to protect your assets from scam?

Scam Alert: how to protect your assets from scam?

BSC DApp Guide Series

BSC DApp Guide Series

Serum DEX user guide

Serum DEX user guide

Serum Dex Video Guide

Serum Dex Video Guide

Solana extension wallet user guide

Solana extension wallet user guide

Video Guide: How to Enable Password Free Payment?

Video Guide: How to Enable Password Free Payment?

Math Web Wallet

Math Web Wallet is web version of MathWallet, together with Math extension wallet, you can make a fast and secure transfer and asset query operation.

link:
https://mathwallet.org

1. Supported NEAR Wallet
2. Supported HBTC test-net Wallet

Math Extension Wallet

Math Extension Wallet is currently the only multi-chain extension wallet, which has supported more than 50 mainstream public chains, which is especially suitable for professional users and developers.

link:
https://mathwallet.org

1. Supported ETH 2.0 account system
2. Supported ChainX 2.0 Public chain
3.Supported Helium Account System

Math Cloud Wallet

Math Cloud Wallet is the web version of the Cloud Wallet, which ensures assets security, is easy to register and suitable for novices.

Link :
https://cloud.mathwallet.org

1. Launched FIL VPoS pool
2. Launched FIL lending tool

Math Staking

Participating in the node ecosystem of multiple PoS public chains, MathWallet developed a set of staking tools.

Link :
http://mathwallet.org/staking

TRON mainnet node
– Upgraded to v4.1.1;
Polkadot node
– Polkadot node upgraded to v0.8.26-1;
Kusama node
– Kusama node upgraded to v0.8.26-1;
FileCoin node
– FileCoin node upgraded to v1.1.2;

Math VPoS Pool

Virtual Proof of Stake (VPoS) is a new kind of mining pool with multi-crypto supports and rewards.

Link :
https://mathwallet.org/vpos/

Math DApp Store

Math DApp Store is a platform for gathering decentralized applications and the entrance for all Dapp users.

Link :
https://mathdapp.store/

From 1st November to 13th November, 40 DApps were added in Math DApp Store.

ETH

Block Create Art
China’s first science-art brand dedicated to blockchain art field

Token BulkSender
Token in-bulk distribution tool

keep3r
On-Chain service outsourcing network

Alpaca City
A miracle city where DeFi meets Alpaca NFTs

BSC

Block Create Art
China’s first science art brand dedicated to blockchain art field

Token BulkSender
Token in-bulk distribution tool

Yield Farming Ranking
Provide real-time Yield Farming information

PARSIQ
Blockchain monitor and intelligence platform

JustLiquity
Liquidity Farming Protocol

Defistation
DeFi related data and charts board

Remix
Solidity IDE

MyBscWallet
Quick check to the address of token position and the liquidity in each swap DApp

bStable
The automatic market maker serves as a swap platform for stablecoins on BSC

SOL

SerumDEX Math
High performance decentralized exchange

SerumSwap Math
AMM Serum Swap On Solana blockchain

FIL

FIL Lending
Stake USDT/BTC to make a FIL loan

ETH2

Scout
Eth2 Deposit Contract data monitor system

Near

Berry Club
The Pixel game that can earn Berry on Near

Math Cloud SWAP

Math Cloud SWAP supports the fast trading of BTC, ETH, EOS, USDT, USDC, TRX, ATOM, MATH, PCX, KSM, DOT, FIL through the aggregation of the depth of exchanges such as Binance, Huobi, and OKEx.

Click Cloud Wallet – Trade

Link :
https://cloud.mathwallet.org/#/

Math Cross-chain SWAP

The cross-chain SWAP in MathWallet is a cross-chain fast exchange service jointly launched by MathWallet and SWFT Blockchain, which supports cross-chain exchange between the following currencies:

BTC、ETH、EOS、ONT、TRX、VET、USDT-ERC20、USDT-TRON、DAI、USDC、PAX、GUSD、TUSD、HUSD、BUSD、MDS、ONG、BTT、HT、BNB、OKB、MATH

Click HD Wallet – Trade

Math News

Math News provides the latest news and price information for all public chains supported by MathWallet.

Link :
http://news.mathwallet.xyz/

MathLabs

MathLabs is an incubator and research center of MathWallet that incubates and produces a variety of projects, tools, and articles.

Link :
http://mathwallet.org/labs/

MathWallet API Documentation

http://doc.mathwallet.org/

MathChain

MathChain is the Polkadot Smart Wallet Parachain based on Substrate.

link:
https://mathchain.org
https://github.com/mathwallet/MathChain

Math Community Activities

Math Show #015 opened at 2020.11.11 at 18:00.The guest is Tim Ogilvie, CEO of Staked, the subject is “The Common sense and Opportunities that you want to know about ETH 2.0”.

ETH 2.0 will launch at 1st December, new version of MathWallet browser extension supports the creation and import of ETH 2.0 address. On the same time MATH DApp Store listed Eth2 DApp: https://mathdapp.store/?blockchain=eth2 ETH 2.0 deposit contract has also passed security audit and been deployed. Up to now, 15000 ETH has been deposited. Get your MathWallet ready for the mass development of ETH ecosystem!

MATH wrote a series of BSC DAPP Dev Tutorial to talk about how to setup BSC development environment with MathWallet / how to create a BEP20 Token / how to create a BSC NFT Token etc. If you are interested in build sth on #BSC, they are good materials to start with. Link: http://blog.mathwallet.org/?tag=BSCdapp

For celebrating Serum’s launch in MathWallet, users can trade Serum DEX in MathWallet, the airdrop event is held by both parties in MathWallet Twitter, with 150 SRM + 300 MATH free-giveaway, check out @MathWallet on Twitter for more information.

How to cancel account allowance approval in Binance Smart Chain?

Download MathWallet first:https://www.mathwallet.org

Note:iOS user please download TestFlight version (How to install MathWallet iOS TestFlight version?)

What is allowance approval?

To simplify the smart contract, most DeFi dapp will initial BEP20 token allowance approval so that the smart contract can transfer the BEP20 token without approval every time.

What is the risk of allowance approval?

Because most of the allowance amount is set to unlimited, if the contract has security risk or it is a scam project, all allowance approved token can be transfered any time without your approval.

How to cancel account allowance approval?

Open Approve.sh in DApp store.

Once open, all DApps authorized by current address will be displayed., click Edit to modify.

You can choose to set the token upper limit that allows DApp to use or directly click Decline to cancel the authorization

Enter 0 and click Done, or directly click Decline. After confirmation, the authorization will be cancelled.