# Showcase **URL:** https://forum.openzeppelin.com/c/smart-contracts/showcase/32.md [Latest](https://forum.openzeppelin.com/latest.md) · [Categories](https://forum.openzeppelin.com/categories.md) · [Tags](https://forum.openzeppelin.com/tags.md) --- ## [About the Showcase category](https://forum.openzeppelin.com/t/about-the-showcase-category/1605)
**Author:** [@abcoathup](https://forum.openzeppelin.com/u/abcoathup)\ **Replies:** 0
Showcase your projects to the community. This includes day jobs, side hustles, pet projects and hackathon projects. Great opportunity to share with the community what you are building. Also what use is made of OpenZep… --- ## [Willing to test out new features for our business asset marketplace (LayerMarket)?](https://forum.openzeppelin.com/t/willing-to-test-out-new-features-for-our-business-asset-marketplace-layermarket/41313)
**Author:** [@anotherbuilder](https://forum.openzeppelin.com/u/anotherbuilder)\ **Replies:** 1\ **Last updated:** [August 26, 2025, 10:23am UTC](https://forum.openzeppelin.com/t/willing-to-test-out-new-features-for-our-business-asset-marketplace-layermarket/41313 "2025-08-26T10:23:40Z")
Simply put, we’re building LayerMarket, an online marketplace to buy and sell business assets, such as Datasets and IP, on top of Ethereum and Layer 2 networks (Arbitrum, Base, and Optimism). We’ve made some exciting up… --- ## [Patron Token and cross-collectional NFT](https://forum.openzeppelin.com/t/patron-token-and-cross-collectional-nft/44494)
**Author:** [@Sebasky](https://forum.openzeppelin.com/u/Sebasky)\ **Replies:** 0\ **Last updated:** [July 7, 2025, 3:38pm UTC](https://forum.openzeppelin.com/t/patron-token-and-cross-collectional-nft/44494 "2025-07-07T15:38:05Z")
I am working on content-finance and content tokenization. Using NFT for monetization of existing culture. I started with music, but I will go into multimedia. I am focusing on modernization of patronage for now. Current… --- ## [AMM for launching new tokens](https://forum.openzeppelin.com/t/amm-for-launching-new-tokens/42346)
**Author:** [@Basedsaylor](https://forum.openzeppelin.com/u/Basedsaylor)\ **Replies:** 3\ **Last updated:** [December 2, 2024, 12:12am UTC](https://forum.openzeppelin.com/t/amm-for-launching-new-tokens/42346 "2024-12-02T00:12:49Z")
Hello, I have created a smart contract suitable for launching new tokens. Its pricing is similar to uniswapv2, but all pairs are in a single smart contract. The main difference is that when a new token is launched, ther… --- ## [Automated Market Maker for NFTs](https://forum.openzeppelin.com/t/automated-market-maker-for-nfts/42345)
**Author:** [@Basedsaylor](https://forum.openzeppelin.com/u/Basedsaylor)\ **Replies:** 0\ **Last updated:** [November 28, 2024, 3:41pm UTC](https://forum.openzeppelin.com/t/automated-market-maker-for-nfts/42345 "2024-11-28T15:41:22Z")
Hello, I have created an automated marked maker contract for NFTs. It is best suitable for launching new NFT collections. Here is the contract source code: https://github.com/simplepools/simplepools/blob/main/simplepool… --- ## [A decentralized investment scheme](https://forum.openzeppelin.com/t/a-decentralized-investment-scheme/17112)
**Author:** [@Mona\_Paul](https://forum.openzeppelin.com/u/Mona_Paul)\ **Replies:** 4\ **Last updated:** [October 29, 2024, 11:17am UTC](https://forum.openzeppelin.com/t/a-decentralized-investment-scheme/17112 "2024-10-29T11:17:27Z")
Hi guys, for game developers, and project owners.. i made a decentralized investment system smart contract where anyone and everyone can invest in your game platform or project and can get their returns based on the prof… --- ## [Multisend ERC20 tokens and Ether airdrop smart contract](https://forum.openzeppelin.com/t/multisend-erc20-tokens-and-ether-airdrop-smart-contract/6610)
**Author:** [@olegabr](https://forum.openzeppelin.com/u/olegabr)\ **Replies:** 16\ **Last updated:** [August 23, 2024, 4:18pm UTC](https://forum.openzeppelin.com/t/multisend-erc20-tokens-and-ether-airdrop-smart-contract/6610 "2024-08-23T16:18:39Z")
I want to share the MultiSend contract I’ve developed: https://etherscan.io/address/0xcd5485b34c9902527bbee21f69312fe2a73bc802#code This contract has methods to efficiently send ERC20 or Ether to many recipients at once… --- ## [Taxable Contract - Add an Optional Tx Tax to Your Token](https://forum.openzeppelin.com/t/taxable-contract-add-an-optional-tx-tax-to-your-token/30440)
**Author:** [@CrocArms](https://forum.openzeppelin.com/u/CrocArms)\ **Replies:** 5\ **Last updated:** [July 29, 2024, 12:53am UTC](https://forum.openzeppelin.com/t/taxable-contract-add-an-optional-tx-tax-to-your-token/30440 "2024-07-29T00:53:50Z")
Created a contract that can be imported into your ERC20 token contract that handles a tax. The tax amount can be updated within a hardcoded range of 0.25% to 15%, the tax destination address can be updated to any one add… --- ## [My Coding Journey: Beginner to Pro](https://forum.openzeppelin.com/t/my-coding-journey-beginner-to-pro/2390)
**Author:** [@Jshanks21](https://forum.openzeppelin.com/u/Jshanks21)\ **Replies:** 114\ **Last updated:** [December 18, 2023, 1:09pm UTC](https://forum.openzeppelin.com/t/my-coding-journey-beginner-to-pro/2390 "2023-12-18T13:09:59Z")
A friend in my Slack group inspired me to start recording my coding journey. I’ve already been learning to code on the blockchain for a few months though. So while this is Day 1, it’s technically Day1 += 4mos; Day 1: B… --- ## [TransactionRevertedWithoutReasonError: Transaction has been reverted by the EVM:](https://forum.openzeppelin.com/t/transactionrevertedwithoutreasonerror-transaction-has-been-reverted-by-the-evm/38243)
**Author:** [@omarjabaly](https://forum.openzeppelin.com/u/omarjabaly)\ **Replies:** 11\ **Last updated:** [October 28, 2023, 4:31pm UTC](https://forum.openzeppelin.com/t/transactionrevertedwithoutreasonerror-transaction-has-been-reverted-by-the-evm/38243 "2023-10-28T16:31:16Z")
Hello! When I execute the Approve function on an ERC20 contract from Remix on mumbai polygon using my metamask, everything works fine. However, when I execute it using my front end, it fails giving the error: Transactio… --- ## [Using keyless deployment and CREATE3 to deploy contracts to same address on multiple blockchains](https://forum.openzeppelin.com/t/using-keyless-deployment-and-create3-to-deploy-contracts-to-same-address-on-multiple-blockchains/38041)
**Author:** [@SKYBITDev3](https://forum.openzeppelin.com/u/SKYBITDev3)\ **Replies:** 0\ **Last updated:** [October 8, 2023, 8:27pm UTC](https://forum.openzeppelin.com/t/using-keyless-deployment-and-create3-to-deploy-contracts-to-same-address-on-multiple-blockchains/38041 "2023-10-08T20:27:30Z")
I've created a GitHub repository that explores the pros and cons of various ways to achieve the goal of getting the same address on different blockchains for a contract. My conclusion is that the best way to do it is to … --- ## [What happens in the Shadows](https://forum.openzeppelin.com/t/what-happens-in-the-shadows/37426)
**Author:** [@Lodro](https://forum.openzeppelin.com/u/Lodro)\ **Replies:** 2\ **Last updated:** [August 10, 2023, 9:11pm UTC](https://forum.openzeppelin.com/t/what-happens-in-the-shadows/37426 "2023-08-10T21:11:35Z")
Through a lot of tests on my own and developing contracts for others, usually for IDO's (do with them what you will, I develop contracts, not dictate how or for what purpose you use them), I have been toying with new way… --- ## [I develped a perspective 3D graphic rendering algorithm fully in solidity, Maybe the first](https://forum.openzeppelin.com/t/i-develped-a-perspective-3d-graphic-rendering-algorithm-fully-in-solidity-maybe-the-first/36061)
**Author:** [@scinftist.eth](https://forum.openzeppelin.com/u/scinftist.eth)\ **Replies:** 12\ **Last updated:** [May 15, 2023, 11:41am UTC](https://forum.openzeppelin.com/t/i-develped-a-perspective-3d-graphic-rendering-algorithm-fully-in-solidity-maybe-the-first/36061 "2023-05-15T11:41:41Z")
Perspective 3D graphic rendering algorithm in solidity lack of floating point support by EVM The first challenge was that Ethereum does not have support for floating-point arithmetic that is necessary for 3D rendering co… --- ## [Web3modal - easily connect any wallet with your dApp](https://forum.openzeppelin.com/t/web3modal-easily-connect-any-wallet-with-your-dapp/2702)
**Author:** [@miohtama](https://forum.openzeppelin.com/u/miohtama)\ **Replies:** 12\ **Last updated:** [April 5, 2023, 6:09am UTC](https://forum.openzeppelin.com/t/web3modal-easily-connect-any-wallet-with-your-dapp/2702 "2023-04-05T06:09:24Z")
Hi, I am one of the maintainers of Web3modal. It is a project that allows you easily to connect any wallet with your web3.js project. There are five categories of Ethereum wallets that can interact with dApps Brows… --- ## [Requesting feedback on Biblioteca, Filosofía Código's web3 integrations library: Connecting people and protocols through simplified access to information](https://forum.openzeppelin.com/t/requesting-feedback-on-biblioteca-filosofia-codigos-web3-integrations-library-connecting-people-and-protocols-through-simplified-access-to-information/34141)
**Author:** [@turupawn](https://forum.openzeppelin.com/u/turupawn)\ **Replies:** 0\ **Last updated:** [January 8, 2023, 11:52pm UTC](https://forum.openzeppelin.com/t/requesting-feedback-on-biblioteca-filosofia-codigos-web3-integrations-library-connecting-people-and-protocols-through-simplified-access-to-information/34141 "2023-01-08T23:52:25Z")
Hi everyone, I'm turupawn from Filosofía Código (check us out on YouTube: FilosofiaCodigo). At Filosofía Código, we create technical content for developers in Spanish, English, and French on topics such as DeFi, NFTs, L… --- ## [No-Code Smart Contracts Generator](https://forum.openzeppelin.com/t/no-code-smart-contracts-generator/33865)
**Author:** [@cues](https://forum.openzeppelin.com/u/cues)\ **Replies:** 1\ **Last updated:** [December 21, 2022, 2:09am UTC](https://forum.openzeppelin.com/t/no-code-smart-contracts-generator/33865 "2022-12-21T02:09:26Z")
Hi! We have created a no-code smart contracts generator and dApp builder where you can build contracts just by filling up the form fields. We would compile and deploy it for you or you could download the code provided a… --- ## [Customized NFT collection](https://forum.openzeppelin.com/t/customized-nft-collection/33190)
**Author:** [@Jan\_Miksik](https://forum.openzeppelin.com/u/Jan_Miksik)\ **Replies:** 0\ **Last updated:** [November 17, 2022, 2:23pm UTC](https://forum.openzeppelin.com/t/customized-nft-collection/33190 "2022-11-17T14:23:59Z")
Hello I try to create a slightly customized NFT collection. About this collection 1) only non-fungible NFT tokens 2) Royalties with support for major marketplaces. 3) Be secure and tested 4) Limits for max supply an… --- ## [Mobile SDKs for NFTs on iOS](https://forum.openzeppelin.com/t/mobile-sdks-for-nfts-on-ios/33077)
**Author:** [@Linh\_Tran](https://forum.openzeppelin.com/u/Linh_Tran)\ **Replies:** 0\ **Last updated:** [November 11, 2022, 4:38pm UTC](https://forum.openzeppelin.com/t/mobile-sdks-for-nfts-on-ios/33077 "2022-11-11T16:38:53Z")
We are building mobile SDKs to help developers integrate NFTs into iOS apps with just a few lines of code. We are a company funded by Y Combinator (S21). Our website: https://www.dreamerly.com/ Our beta will launch with… --- ## [Solidity Big Number](https://forum.openzeppelin.com/t/solidity-big-number/31724)
**Author:** [@barakman](https://forum.openzeppelin.com/u/barakman)\ **Replies:** 0\ **Last updated:** [September 7, 2022, 2:43pm UTC](https://forum.openzeppelin.com/t/solidity-big-number/31724 "2022-09-07T14:43:21Z")
A while back, I have implemented a package supporting unlimited-size computations in Solidity. This package consists of the following libraries: NaturalNum - a set of functions over natural numbers RationalNum - a s… --- ## [Create your own NFT store on your website with WordPress plugins](https://forum.openzeppelin.com/t/create-your-own-nft-store-on-your-website-with-wordpress-plugins/4348)
**Author:** [@ninoarteiro](https://forum.openzeppelin.com/u/ninoarteiro)\ **Replies:** 26\ **Last updated:** [August 15, 2022, 5:40am UTC](https://forum.openzeppelin.com/t/create-your-own-nft-store-on-your-website-with-wordpress-plugins/4348 "2022-08-15T05:40:14Z")
A new paradigm is emerging in the cryptoart. Now the cryptoartists have the option to be fully decentralized. The cryptoartists can have their own NFT contract and their own store on your website. This is a total autono… --- ## [Releasable Contract - Withdraw Stuck or Incompatible Tokens From Your Contract](https://forum.openzeppelin.com/t/releasable-contract-withdraw-stuck-or-incompatible-tokens-from-your-contract/30666)
**Author:** [@CrocArms](https://forum.openzeppelin.com/u/CrocArms)\ **Replies:** 1\ **Last updated:** [July 29, 2022, 9:30am UTC](https://forum.openzeppelin.com/t/releasable-contract-withdraw-stuck-or-incompatible-tokens-from-your-contract/30666 "2022-07-29T09:30:26Z")
One of the major problems with ERC20 and ERC721 tokens is that they can get stuck or lost, sent to incompatible contracts instead of a wallet. I imagine this is mostly from inexperienced users pasting the wrong address i… --- ## [Smart Contract Developer/Marketing Tax Not Being Deposited in Wallet](https://forum.openzeppelin.com/t/smart-contract-developer-marketing-tax-not-being-deposited-in-wallet/23053)
**Author:** [@shrvne](https://forum.openzeppelin.com/u/shrvne)\ **Replies:** 1\ **Last updated:** [July 25, 2022, 12:55am UTC](https://forum.openzeppelin.com/t/smart-contract-developer-marketing-tax-not-being-deposited-in-wallet/23053 "2022-07-25T00:55:50Z")
As a new Solidity programmer I've set my first milestone to clone the Mononoke inu contract and make it work as expected, so I copied their contract as "AnakInu2" and only changed the wallet address where the Dev/marketi… --- ## [Smart Contract Builder](https://forum.openzeppelin.com/t/smart-contract-builder/29888)
**Author:** [@BlockchainDev](https://forum.openzeppelin.com/u/BlockchainDev)\ **Replies:** 21\ **Last updated:** [July 12, 2022, 7:28pm UTC](https://forum.openzeppelin.com/t/smart-contract-builder/29888 "2022-07-12T19:28:35Z")
Hello everyone, I have created an all in one solution that will build a contract on the parameters you provide. It will compile, deploy and verify it all done through the browser. Currently, it is running on rinkeby as… --- ## [Human-first NFT mints](https://forum.openzeppelin.com/t/human-first-nft-mints/21921)
**Author:** [@tinchoabbate](https://forum.openzeppelin.com/u/tinchoabbate)\ **Replies:** 8\ **Last updated:** [April 21, 2022, 1:12am UTC](https://forum.openzeppelin.com/t/human-first-nft-mints/21921 "2022-04-21T01:12:40Z")
Can you build an NFT distribution app that it is end-to-end protected from bots ? :robot: Hey folks! Wanted to share a little experiment I coded during this last week. Hoping that it can spark some cool ideas for 2022. … --- ## [Unicode Ethereum Project](https://forum.openzeppelin.com/t/unicode-ethereum-project/23338)
**Author:** [@devstein](https://forum.openzeppelin.com/u/devstein)\ **Replies:** 0\ **Last updated:** [January 25, 2022, 2:47am UTC](https://forum.openzeppelin.com/t/unicode-ethereum-project/23338 "2022-01-25T02:47:01Z")
The Unicode Ethereum Project is an initiative to provide libraries and contracts for Unicode data, algorithms, and utilities for Ethereum developers. I was working on a Dapp, where I wanted to validate user-inputted… --- ## [Additional function](https://forum.openzeppelin.com/t/additional-function/22498)
**Author:** [@Simono](https://forum.openzeppelin.com/u/Simono)\ **Replies:** 0\ **Last updated:** [January 10, 2022, 9:00pm UTC](https://forum.openzeppelin.com/t/additional-function/22498 "2022-01-10T21:00:38Z")
Hello Guys ! I want to launch a collection! and I have NFTs which give birth to other generations! how to do this feature and put it on the blockhain? is it in the same smart contract of the launch of the collection? or… --- ## [NetStorm - React NFT Marketplace Template](https://forum.openzeppelin.com/t/netstorm-react-nft-marketplace-template/22080)
**Author:** [@djrthree](https://forum.openzeppelin.com/u/djrthree)\ **Replies:** 0\ **Last updated:** [January 3, 2022, 3:25am UTC](https://forum.openzeppelin.com/t/netstorm-react-nft-marketplace-template/22080 "2022-01-03T03:25:10Z")
Interest-earning limit orders. We Buy The Dip is an SVG-based, on-chain NFT that that gets loaded with ETH, converts to USDC, lent out to a vault to earn interest, and eventually repurchases ETH at some preset strike p… --- ## [MultiSignature Contract - Access Control Extension](https://forum.openzeppelin.com/t/multisignature-contract-access-control-extension/21789)
**Author:** [@lhemerly](https://forum.openzeppelin.com/u/lhemerly)\ **Replies:** 0\ **Last updated:** [December 28, 2021, 1:41pm UTC](https://forum.openzeppelin.com/t/multisignature-contract-access-control-extension/21789 "2021-12-28T13:41:30Z")
After a client lost funds due to a single owner wallet got hacked I decided to make a simple multi-signature implementation extending access control. I think it is a cheap and effective way to protect key contracts funct… --- ## [My coding Journey: From 0 to mainNet](https://forum.openzeppelin.com/t/my-coding-journey-from-0-to-mainnet/15851)
**Author:** [@JulianPerassi](https://forum.openzeppelin.com/u/JulianPerassi)\ **Replies:** 26\ **Last updated:** [December 14, 2021, 1:43pm UTC](https://forum.openzeppelin.com/t/my-coding-journey-from-0-to-mainnet/15851 "2021-12-14T13:43:19Z")
After seeing Jshanks21's post and reading some articles recommending to keep a journal I'm here. The main idea is to use this post as a diary of progress, doubts and ideas. Any suggestion or collaboration will be more th… --- ## [How to create a token with airdrop and lock airdrop 3 months?](https://forum.openzeppelin.com/t/how-to-create-a-token-with-airdrop-and-lock-airdrop-3-months/20127)
**Author:** [@SiwelNivek](https://forum.openzeppelin.com/u/SiwelNivek)\ **Replies:** 2\ **Last updated:** [December 5, 2021, 7:29am UTC](https://forum.openzeppelin.com/t/how-to-create-a-token-with-airdrop-and-lock-airdrop-3-months/20127 "2021-12-05T07:29:47Z")
Dear Support, I want to build a new contract with Airdrop feature, all tokens of airdrop will be locked transfer in 3 months. Which functional should be included? After airdropping certain amounts of token to their wa… [Next page](https://forum.openzeppelin.com/c/smart-contracts/showcase/32.md?page=1)