Ethereum Payment Gateway with Fraud Detection -- 2

@AwaisChaudhry

Hi there, I’ve read your Ethereum payment gateway idea and I’m confident I can deliver a production-ready solution: audited Solidity contracts, a lightweight off-chain service in Node.js or Python, and a simple front-end demo to prove end-to-end flow. I will implement a secure consumer-to-business payment pattern using a per-payment one-time contract address that settles instantly to the merchant, with fraud checks running off-chain (velocity limits, address reputation, AML heuristics) before any funds are forwarded. The off-chain service will expose a REST or GraphQL API and emit webhook/callback events for success, failure, or flagged payments. Merchants will get real-time updates and a straightforward setup guide for testnet first, then a clear path to mainnet deployment. I’ll include tests, docs, and a compact migration plan so you can ship quickly. 1) What testnet and mainnet deployment plan do you want, and which networks should we support first? 2) Should we start with ETH and a specific ERC-20 tokens or plan broader token support? 3) How would you want fraud checks weighted (velocity, address reputation, AML heuristics) and what data sources are allowed? 4) What callback method do you want (webhook, GraphQL subscription) and how should we secure it? 5) Do you need a one-time smart contract address per payment, and how should refunds or disputes be handled? 6) What is the target latency for "instant" confirmations and webhook delivery? 7) What security or compli

@OutsourceMan

⭐⭐⭐⭐⭐ CnELIndia, together with Raman Ladhani, can successfully deliver your Ethereum-based consumer-to-business payment gateway end-to-end. We will design and audit production-ready Solidity smart contracts for one-time payment addresses, ensuring secure ETH/ERC-20 transfers. Our team will build a lightweight Node.js service integrated with real-time fraud-detection logic, including velocity limits, address reputation checks, and AML heuristics. We will expose a REST/GraphQL API with webhook callbacks for seamless merchant integration and develop a minimal front-end demo to showcase the flow from payment initiation to settlement. CnELIndia’s blockchain expertise and Raman Ladhani’s hands-on Ethereum/Web3 engineering experience will ensure testnet validation, smooth mainnet deployment, and comprehensive setup documentation, delivering a robust, secure, and merchant-ready gateway.

@a4logic

Hello, With over a decade of experience in the web development industry, we've embarked on various projects involving the Ethereum network, including gateways and DeFi tools. Our proficiency in JavaScript and PHP implants us with the capacity to develop production-ready code that will seamlessly run your Ethereum Payment Gateway. We understand your need for a fraud-detection system that works well in real-time, and this is one of our strengths. Our team have successfully implemented similar modules by designing logical fraud-detection systems, incorporating velocity limits, address reputation, and basic AML heuristics. We consider customer satisfaction as our priority which aligns perfectly with your requirement for built-in security safeguards. Therefore, we propose to establish a REST or GraphQL API integrated seamlessly with webhook callbacks for real-time payment status updates - allowing you to take prompt actions when necessary. To further guarantee the successful implementation of your gateway, not only will we supply audited Solidity smart contracts but also provide a lightweight Node.js or Python service capable of communicating with the blockchain effectively. To top it all off, our services do not end at code delivery; we will accompany you through testnet first deployment (for utmost security) to mainnet deployment, providing you with meticulous set-up documents. We would be honored to transform your vision into reality Thanks!

@softsolution2000

I have extensive experience in PHP, JavaScript, Python, Node.js, and Blockchain, making me a perfect fit for the "Ethereum Payment Gateway with Fraud Detection -- 2" project. The budget can be adjusted after discussing the full scope, and I am committed to completing the project within your budget. I am confident in my ability to deliver audited Solidity smart contracts, fraud detection modules, APIs, and a front-end demo efficiently. Let's discuss the details and get started right away. Please review my 15-year-old profile to see my work history. Looking forward to hearing from you.

@nikhilgarg96

As an experienced full-stack developer with a strong command of Node.js, Python, and Solidity, I am confident in my ability to deliver on all the key components of your Ethereum payment gateway project. Having worked extensively on backend technologies including PHP (Laravel, CI, CakePHP, Yii) and Node.js, I have built robust and scalable systems that handle complex transactional processes. My proficiency with Python/Django will ensure that your fraud-detection module is not only integrated seamlessly but also made efficient by leveraging libraries like pandas and NumPy. Moreover, my knowledge in JavaScript will enable me to create a lightweight yet powerful frontend demo that showcases the entire end-to-end workflow of the gateway. Familiarity with e-commerce platforms like WordPress and Shopify will aid in optimizing the merchant’s experience and ensuring smooth settlement of successful transactions. With 5+ years experience building gateways, fintech applications, DeFi tools on the Ethereum network and more; I can guarantee not just code but solutions that align closely with your vision. Above all, I'm committed to providing a reliable service through creative problem-solving -- traits essential in navigating a space as dynamic as blockchain technology. Let's team up! With Regards!

@SBITServices

Hi Muhammad, I will develop a secure Ethereum payment gateway with fraud detection for seamless online transactions. The gateway will utilize Solidity smart contracts for on-chain payments, integrate fraud detection logic, and provide a user-friendly API for merchants. I have experience in building DeFi tools on Ethereum and can deliver the required components efficiently. Please start the chat to discuss this project further. Regards, Sai Bhaskar

@hireageek

Hi there, I am excited about your project for creating a consumer-to-business payment gateway on the Ethereum blockchain. With extensive experience in developing on-chain solutions and handling security checks in smart contracts, I am confident that I can help bring your vision to life swiftly and effectively. My background includes building payment gateways and fraud detection modules, ensuring seamless transactions while safeguarding against potential threats. I will deliver audited Solidity smart contracts tailored for consumer-to-business interactions, alongside a robust off-chain service that includes integrated fraud detection logic. Additionally, I will provide a lightweight Node.js service and a minimal front-end demo to showcase the product's capabilities. Let's aim for a timeline of around three weeks for delivery, allowing ample time for thorough testing on the testnet. I would love to discuss this further—What specific fraud detection metrics or thresholds are you considering for this payment gateway? Thanks,

@efanntyo

Hi there Employer, Thanks for posting this exciting project on this platform. I am really thrilled to place my proposal to your project because I am too much familar with all skiles necessary to do your project - PHP, JavaScript, Python, Node.js, Blockchain, Ethereum, Fraud Detection, Solidity, API Development I am looking forward to starting your project right away. Thanks and regards

@marjanahmed13

Hi! My name is Marjan and I'm here to offer you my services as a skilled applicant with over a decade of experience working on Freelancer.com. l believe I am the best fit candidate for this project due to my extensive experience; I would like to have a discussion to get to know that we both are on the same page. Once the scope will be locked, I will start working on it right away.

@ayesha0124

Hi, I'm excited about your project to create a consumer-to-business payment gateway using Ethereum. With extensive experience in blockchain development, particularly in creating smart contracts and payment gateways, I’m confident in delivering a robust solution tailored to your needs. My background includes building audited Solidity smart contracts and fully functional fraud-detection modules. I can develop a lightweight Node.js or Python service that efficiently interacts with the Ethereum blockchain, ensuring instant payment confirmations and secure transactions. Additionally, I will create a minimal front-end demo to showcase the process end-to-end, complete with comprehensive setup documentation. I can start immediately and aim to deliver a prototype first on the testnet, followed by mainnet deployment within 10 days. Let’s collaborate to make your gateway a success!

@enervell

Hello, I am a senior software engineer for 10+ years, and have built already crypto payment gateway for merchants. It's developed in Golang(for backend) and Angular(for frontend), and it supports ETH, BSC and Polygon at the moment. The thing need to discuss is that how to check reputation or fraud detection. If you can provide the development server and domain, I can set it up for testnet so you can see how it works. Thanks.

@abhisaini0188

With a decade of expertise, I am well-versed in the key areas crucial to your project's success. As a seasoned developer, I have extensive experience building scalable web applications using Node.js which will be integral for integrating your Ethereum payment gateway with comprehensive fraud detection measures. My proficiency in Python is an added advantage as it aligns perfectly with your needs for creating a lightweight service that communicates with the chain. Over the years, I have consistently delivered top-quality projects tailored to specific client requirements. My versatility has allowed me to champion various technologies including AI and ML, a skillset that can be applied to ensure efficient and effective fraud detection on your Ethereum payment gateway. With my in-depth knowledge of both frontend and backend development, along with experience in building RESTful and GraphQL APIs for seamless communication between different components, I can proficiently provide you with production-ready Solidity smart contract(s), REST or GraphQL API with webhook callbacks, as well as a front-end demo that showcases the entire flow of your payment gateway. I eagerly await the opportunity to utilise my skills to safely integrate Ethereum transactions into ecommerce platforms efficiently combating fraudulent activities. With Regards! Abhi

@Feriver

Hi, I will deliver a production-ready Ethereum payment gateway designed for real merchant use, not a demo-only prototype. The solution will combine audited Solidity smart contracts with a resilient off-chain service that monitors deposits, enforces fraud controls, and notifies merchant systems in real time. Smart contracts will generate single-use payment addresses, validate deposits in ETH or ERC-20 tokens, and ensure funds settle directly to merchant wallets without custody risk. The off-chain Node.js or Python layer will handle transaction indexing, velocity limits, address reputation scoring, and rule-based AML heuristics before triggering REST or GraphQL callbacks. Merchants will receive deterministic status updates for success, failure, or flagged events via webhooks or subscriptions. A minimal front-end demo will illustrate the full consumer flow from “Pay with Crypto” through confirmation. The delivery will include testnet deployment, mainnet readiness, and clear documentation so teams can integrate the gateway quickly and operate it safely at scale. Regards, Soas

@johnallenvillan1

Hey there, I'm John Allen, an experienced Solidity/Web3 engineer ready to take on your Ethereum Payment Gateway project. I've successfully developed gateways and DeFi tools on the Ethereum network, making me well-equipped to deliver audited Solidity smart contracts, a fraud-detection module, and a seamless API with webhook callbacks. I will ensure a secure and efficient payment flow, enabling merchants to accept on-chain payments with ease. Let's discuss how I can bring your vision to life. What's the next step?

@BSDesigners

Hello Muhammad, I will develop a secure Ethereum payment gateway with fraud detection for online shops and SaaS platforms. The gateway will allow on-chain payments in ETH or ERC-20 tokens, with instant confirmation, fraud checks, and settlement directly to the merchant's wallet. Let's discuss further. Thanks

@WishingBell

Hi, I’ve read your gateway brief and I’m confident I can deliver a production-ready Ethereum payment gateway with built-in fraud checks. I’ve shipped on-chain payment flows and DeFi integrations: audited Solidity contracts that create one-time payment addresses and enforce secure settlement, Node.js/Python services for real-time chain watching, and merchant-facing APIs with webhook/GraphQL callbacks. I’ll implement the off-chain fraud module (velocity limits, address reputation, AML heuristics), ensure successful transactions settle directly to merchant wallets, and emit clear callbacks for flagged payments. I’ll deliver audited contracts, an integrated fraud service, a REST/GraphQL API, a minimal front-end demo and concise testnet→mainnet docs. Next step: a short scoping call to confirm supported tokens, settlement preferences and webhook format so I can produce a testnet MVP plan. Which ERC-20 tokens should we support first, and do you prefer direct settlement to merchant wallets or a custodial routing layer for reconciliation? Best regards, Andrew

@maximg10

⭐Hello [ClientFirstName], I’m ready to assist you right away!⭐ I believe I’d be a great fit for your project since I have extensive experience in developing Ethereum-based payment solutions and fraud detection systems. My technical expertise includes Solidity smart contract development, Web3 integration, and API development for blockchain applications. With a keen focus on security and efficiency, I can ensure the seamless implementation of the consumer-to-business payment gateway with built-in fraud checks as per your requirements. My experience in DeFi tools and Ethereum development equips me to deliver audited Solidity smart contracts, integrate fraud-detection modules, and create REST or GraphQL APIs with webhook callbacks. This project aims to revolutionize online payments through a secure, efficient, and transparent gateway, addressing the pressing need for on-chain payments with fraud prevention mechanisms. If you have any questions, would like to discuss the project in more detail, or would like to know how I can help, we can schedule a meeting. Thank you, Maxim

@NadiaCrea8weB

Hi there, I’ve shipped production Ethereum payment gateways with on-chain settlement and fraud checks, and I’ll deliver audited Solidity contracts, a Node.js service, and a minimal front-end to prove end-to-end flow. I’ll architect one-time contract rails, off-chain fraud-detection, REST/GraphQL API with webhooks, and meticulous docs for testnet then mainnet deployment, ready to start now with clear milestones. Best regards,

@juanestebana17

Hi there, I’ve built production-ready Ethereum payment gateways with on-chain settlement and robust off-chain fraud checks. I will deliver audited Solidity contracts that enable consumer-to-business payments in ETH or ERC-20, a lightweight Node.js or Python service to monitor the chain, and a simple REST or GraphQL API with webhook callbacks for real-time status updates. Each payment will mint a one-time smart-contract address to ensure instant confirmation, while on-flow fraud-detection — velocity limits, address reputation, and AML heuristics — runs off-chain and notifies the merchant of outcomes. I’ll also deliver a minimal front-end demo and clear setup docs, starting on a testnet and moving to mainnet. Deliverables: audited Solidity contracts, integrated fraud-detection module, API with webhooks, a minimal front-end, and comprehensive docs. Would you like me to start with a testnet MVP (Goerli) and a staged mainnet rollout, and what initial fraud thresholds should we use (velocity limits and address reputation)? Best regards,