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I want a small, production-ready service that can receive USDT (ERC-20) deposits, expose the relevant events through a REST endpoint, and—after JSON Schema validation and API-key authentication—forward cleared funds from my wallet straight into a bank account. The flow should look like this: an external system calls the endpoint with the deposit details; the service verifies the signature, checks the payload against the schema, watches the blockchain until the transaction has the required confirmations, then triggers an automatic transfer to the chosen account. Both domestic (ACH, SEPA, etc.) and international (SWIFT) payouts must be handled seamlessly by the same codebase. Key points to cover • ERC-20 listener that works on the Ethereum mainnet and testnets. • Stateless REST interface with API-key headers; keys must be easily rotated. • Strict JSON Schema enforcement for every request and response. • Wallet-side security anchored in the blockchain plus the API-key layer on the server. • Integration with a reliable ETH payment gateway—or your own smart-contract logic—so money can move from the on-chain wallet to the off-chain bank without manual intervention. Deliverables 1. Source code (prefer Node.js or Python, but open to other well-supported stacks). 2. Postman or Curl examples that cover the full deposit-to-bank cycle. 3. A short deployment guide for Ubuntu-based servers. 4. Unit tests illustrating schema validation, authentication, and transfer triggers. I will consider the job complete once I can spin up the service on a fresh VPS, fund the designated wallet with test USDT, call the endpoint, and watch the funds arrive in a sandbox bank account—domestic and international—without errors.
Project ID: 40419010
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93 freelancers are bidding on average $505 USD for this job

Hi there, I’ve read your USDT wallet-to-bank gateway brief and I’m ready to build a production-ready service that listens for ERC-20 deposits, validates signatures and JSON Schemas, and then moves cleared funds from your on-chain wallet to a bank account, domestic or international, without manual steps. The stack will be Node.js or Python, with a stateless REST API secured by easily rotated API keys, and a robust ERC-20 listener that works on Ethereum mainnet and testnets. I’ll wire in a reliable ETH payment gateway or smart-contract logic to automate on-chain-to-off-chain transfers, ensure strict schema enforcement for all requests and responses, and harden wallet security through blockchain anchors paired with the server key layer. Deliverables will include source code, Postman/Curl examples, a concise Ubuntu deployment guide, and unit tests covering schema validation, authentication, and transfer triggers. I’ll design clean, testable modules so you can spin this up on a fresh VPS, fund test USDT, and verify deposits reach sandbox banks end-to-end. Construct a compelling question about the project to ask the client, tone should be Humorous and Expressively, English Best regards, Muhammad Awais
$750 USD in 12 days
9.4
9.4

⭐️⭐️⭐️ USDT (ERC-20) Deposit Listener & Auto Payout Service ⭐️⭐️⭐️ Hello, How are you? I checked your JD and you want a secure, production-ready service that listens for USDT deposits, validates requests, and automatically triggers bank payouts after confirmations I will build a robust, stateless service with blockchain monitoring, strict schema validation, API-key security, and seamless fiat payout integration Key features: • ERC-20 USDT listener (Ethereum mainnet + testnets) • Confirmation tracking (configurable block confirmations) • REST API with API-key authentication (rotation support) • JSON Schema validation (requests & responses) • Signature verification for incoming payloads • Automated payout trigger (ACH, SEPA, SWIFT via provider) • Webhook/event endpoint for deposit status • Secure wallet handling (hot wallet + provider abstraction) • Logging, retries, and idempotency safeguards Many more as per your need .. Let’s Chat… Thanks
$500 USD in 7 days
9.4
9.4

Hi, This is Elias from Miami. I have gone through your project description and understand you’re looking to create a service that can receive USDT (ERC-20) deposits and provide the relevant functionalities. This sounds like a great opportunity to develop a secure and efficient wallet-to-bank gateway. With over 10 years of experience in backend integration and blockchain development, I have worked on similar projects that require secure transactions and API development. I’m confident in my ability to deliver a production-ready solution that meets your needs. To approach this project, I plan to first outline the architecture, ensuring secure handling of USDT deposits. I’ll integrate the necessary APIs for seamless transactions and build a user-friendly interface to manage these deposits efficiently. I have a few questions to get a better understanding: Q1 – What user roles will be involved in the application? Q2 – Are there any specific payment gateways or banking integrations you have in mind? Q3 – What are your scalability requirements for this service? I’d be happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.
$500 USD in 5 days
8.5
8.5

Hi there, I’ve worked on similar crypto payment flows where blockchain events, secure APIs, and third-party payout systems are combined into a reliable backend service, so handling this end-to-end flow will be smooth and structured. My approach will be to set up a Node.js service that exposes a clean REST API with API-key authentication and strict JSON schema validation. Then I’ll implement an ERC-20 listener to track USDT transactions on mainnet/testnet, verify confirmations, and trigger events once funds are cleared. After that, the service will connect to the payout provider to initiate bank transfers automatically, while keeping everything stateless, secure, and easy to maintain. I’ll also include proper logging, retry handling, and unit tests for validation, authentication, and transfer flow. Once done, you’ll have a production-ready service that you can deploy on a VPS, test with USDT deposits, and see the full deposit-to-bank cycle working in a sandbox environment with clear documentation and API examples. I would request to connect on a quick chat so we can finalize the payout provider and start implementation. Thanks, Rahul A.
$360 USD in 7 days
7.6
7.6

Hi, I will build your USDT deposit listener, REST gateway, and bank payout service — ERC-20 event monitoring, JSON Schema validation, API-key auth with rotation, and automated ACH/SEPA/SWIFT transfers through a single codebase. For the fiat off-ramp, I will integrate a provider like Circle or Bridge rather than rolling custom smart-contract logic for the crypto-to-bank leg. This keeps compliance and settlement handled by a licensed entity while your service stays focused on listening, validating, and triggering — reducing regulatory exposure significantly. Questions: 1) Do you have an existing relationship with a fiat off-ramp provider, or should I evaluate and recommend one? 2) How many block confirmations do you require before triggering the bank transfer? Looking forward to your response. Best regards, Kamran
$280 USD in 10 days
7.4
7.4

Hello, I will build a compact, production-ready service that listens for ERC-20 USDT deposits on Ethereum mainnet and testnets, validates each request with strict JSON Schema, and authenticates via API keys. The flow will trigger automatic on-chain-to-off-chain transfers once the external system posts valid deposit data and the signature checks out, with the wallet's confirmations driving the settlement. The same codebase will handle domestic (ACH/SEPA) and international (SWIFT) payouts, using a secure bridge either through a trusted ETH gateway or a smart-contract that moves funds from the on-chain wallet to the off-chain bank, minimizing manual steps. The stateless REST interface allows easy API-key rotation, and all actions emit clearly defined events for the REST endpoint. Deliverables include clean source code (Node.js or Python preferred), Postman/ cURL examples, a minimal Ubuntu deployment guide, and unit tests covering schema validation, authentication, and transfer triggers. The solution emphasizes on-chain security paired with server-side API-key protection, ensuring robust, auditable deposits and timely payouts. 1) Do you want me to use your own ETH payment gateway or implement an on-chain helper contract to move funds to the bank? 2) What is your preferred approach for API-key rotation (auto-rotation, rotation frequency, and revocation process)? 3) Which banks and payout rails should be supported first (ACH, SEPA, SWIFT) and any jurisdiction limits? 4) What co
$750 USD in 11 days
7.0
7.0

Hi, I can build the USDT ERC20 deposit monitoring service with a secure REST API, schema validation, API key authentication, and testnet support. I will use Node.js or Python with ethers/web3, JSON Schema validation, rotating API keys, confirmation tracking, and clean event endpoints. For bank payouts, I will integrate a compliant provider such as Stripe, Circle, Coinbase Commerce, Ramp, or another supported crypto to fiat payout partner, because direct USDT to ACH SEPA SWIFT requires regulated rails. The service will include transaction verification, webhook or listener logic, transfer trigger handling, sandbox testing, and clear error states. Deliverables will include source code, Postman or Curl examples, Ubuntu deployment guide, and unit tests for auth, schema validation, and payout triggers. I will keep the wallet and server security clean with environment based secrets and no hardcoded keys. Ready to start once you confirm preferred payout provider and testnet requirements.
$500 USD in 7 days
7.1
7.1

With my strong command of Ethereum and experience with ERC-20 tokens, I'm your guy for constructing an efficient and secure end-to-end USDT Wallet-to-Bank Gateway. My work with HTTPS/REST APIs, particularly in implementing stateless interfaces backed by robust authentication measures as you've outlined, will guarantee a seamless integration of your customized gateway. Meanwhile, my Node.js chops and knowledge of JSON Schema—combined with Python proficiency serving the blockchain community—will enable me to ace every aspect of the project. Moreover, our proficiency isn't limited to just building; we also test our solutions meticulously. Just as your project requires, I have deep experience in implementing tests for crucial functionalities like schema validation and transfer triggers. And as someone who has worked extensively on Ubuntu-based servers, my delivery guide will be precise and explicitly tailored for effortless deployment. Lastly, my inclination towards continuous learning keeps me updated on the latest best practices. This proves beneficial for you as we can promptly integrate any reliable ETH payment gateway or even leverage my own smart-contract logic to facilitate smooth on-chain to off-chain transfers, without any manual intervention.
$600 USD in 5 days
6.6
6.6

Hi I'm confident that I can deliver an outstanding solution for your USDT Wallet-to-Bank Gateway project. Over the years, I've built numerous production-ready applications emphasizing efficiency, security, and real-time data processing - precisely what your project requires. Not only do I possess the skills to develop an ERC-20 listener that works on both Ethereum mainnet and its testnets with strict JSON Schema enforcement throughout, but I also have extensive experience designing stateless REST interfaces with easy-to-rotate API-key headers to ensure top-notch security on your wallet side. Rest assured that your project's wallet-side security will be firmly anchored in the blockchain coupled with the added API-key layer on the server to make it as resilient as possible. If you give me project, I will finish perfectly, Kind regards, Jaffer
$250 USD in 7 days
6.3
6.3

Hello There!!! ★★★★ ( USDT ERC-20 to bank gateway with secure API, validation & auto payouts ) ★★★★ I understand you need a production-ready service that listens to USDT deposits, validates requests via JSON schema + API keys, tracks confirmations, and automatically triggers payouts to bank accounts (ACH, SEPA, SWIFT). Fully automated, secure and testable on VPS. ⚜ ERC-20 listener (mainnet + testnets) ⚜ REST API with API-key auth & rotation ⚜ JSON schema validation (req/res) ⚜ Blockchain confirmation tracking ⚜ Wallet-to-bank integration flow ⚜ Unit testing & Postman examples ⚜ Ubuntu deployment setup I’ve worked on blockchain APIs & payment flows, integrating secure transaction tracking with backend systems. I’ll use Node.js or Python with Web3, ensuring clean, reliable flow and strong validation (no manual steps). Let’s discuss gateway options and start quickly. Warm Regards, Farhin B.
$256 USD in 10 days
6.6
6.6

Hi, This looks like two main risks: missing on-chain confirmation handling and brittle off-chain payout integration. You want ERC‑20 listening, strict JSON Schema, API‑key rotation, and automatic ACH/SEPA/SWIFT payouts in one codebase. I’d first check the wallet-to-gateway bridge: verify signature flow and confirmation watcher (confirmations + replay handling), then validate payloads against your schema and gate transfers behind API-key verification with a rotation endpoint. For payouts I’ll integrate a payments provider API adapter layer so domestic and international routes share the same trigger logic. - Node.js or Python service, Postman/curl examples, Ubuntu deploy guide, unit tests - I can start by reviewing required confirmations and the sandbox banking API you’ll use Ready to review access details or sandbox specs and begin. --Smith
$500 USD in 7 days
6.2
6.2

Hello, I can build a compact service that listens for USDT deposits, validates each request with JSON Schema, and securely moves funds from your on-chain wallet to domestic or international bank rails. I’ll keep the flow simple and production-ready so you can deploy on a fresh VPS and run the full cycle without friction. My approach focuses on clean REST endpoints with API-key rotation, efficient blockchain monitoring, and straightforward examples for spinning up the system end‑to‑end. Everything stays plain, reliable, and easy to maintain. Thanks, Teo
$300 USD in 3 days
5.7
5.7

Hello, I’ve reviewed your USDT Wallet-to-Bank Gateway requirements: ERC-20 listener on Ethereum, stateless REST API with API-key auth, strict JSON Schema validation, and automated payout flow (ACH, SEPA, SWIFT) once confirmed deposits are detected on-chain and validated. I will build a production-ready service using Node.js or Python (ethers/web3), implementing an event/indexer layer to track USDT transfers, a confirmation engine, and idempotent REST endpoints. Payloads will be validated via AJV/Pydantic, API keys securely rotated, and a worker queue will trigger payouts through a banking provider integration (e.g., Wise/Stripe Treasury/SWIFT rails). The solution will include Dockerized deployment, Ubuntu setup guide, Postman/Curl examples, and unit tests covering authentication, schema validation, and transfer triggers. I will ensure secure key handling, retry-safe transaction processing, and clear logging/monitoring so you can deploy on a fresh VPS and run full deposit-to-bank execution reliably in both test and production environments. Ready to start immediately and iterate quickly based on your preferred rails and architecture. Which banking payout rail/provider do you want integrated first (Wise, Stripe Treasury, direct SWIFT/SEPA API), and do you already have sandbox credentials? What confirmation threshold should be used for USDT finality, and should the system support only Ethereum mainnet or also testnets like Sepolia? Thanks, Asif
$750 USD in 10 days
5.7
5.7

Hello Dear! Greetings from Toriqul Global Solutions! We are a reliable and experienced web design & development company led by Engineer Toriqul Islam (B.Sc. in CSE, RUET), with over 10 years of proven industry experience delivering quality digital solutions. At Toriqul Global Solutions, we build modern, user-friendly, high-performance websites focused on simplicity, elegance, and functionality to boost engagement and business growth. I have some questions——— 1. Do you already have a USDT wallet private key and bank payout provider? 2. Preferred stack: Node.js or Python? Technologies We Use: Custom Websites Development Using ======>Full Stack Development. 1. HTML5 2. CSS3 3. Bootstrap4 4. jQuery 5. JavaScript 6. AngularJS 7. React JS 8. Node.js 9. WordPress 10. PHP 11. Ruby on Rails 12. MYSQL 13. Laravel 14. .NET 15. CodeIgniter 16. React Native 17. SQL / MySQL 18. Mobile app development 19. Python 20. MongoDB and more skills What will you get? • Responsive design on All Devices •Reusable components •Clean code •Timely delivery tested •Clear communication We would be honored to discuss your project requirements and help bring your ideas to life. Thank you for your time and consideration. Warm Regards, Toriqul Global Solutions
$250 USD in 5 days
5.7
5.7

Hello, I will create a stateless service using node js with express and ethers js to connect to ethereum mainnet and testnets, listen for usdt erc20 transfer events to your wallet and also accept signed requests through a rest endpoint secured by api keys stored as hashed values with easy rotation, validate every request and response using ajv against strict json schema, verify signatures using web3 utilities, and track transactions in a lightweight store such as postgresql or redis only for idempotency and confirmation state, then poll or subscribe until the required confirmations are reached before triggering payout through a provider such as stripe treasury or a crypto off ramp api that supports ach sepa and swift, with clear mapping from wallet funds to bank transfer, add logging and retry logic for failed payouts, write unit tests with jest covering schema auth and transfer flow, Let's have a detailed discussion, as it will help me give you a complete plan, including a timeline and estimated budget. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD in 7 days
5.6
5.6

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I have developed blockchain listening services integrated with REST APIs that reliably track ERC-20 token transactions and automate fund movements seamlessly. The most critical part of successfully completing this project is ensuring robust blockchain event monitoring combined with secure API authentication and precise JSON Schema validation. Approach: ⭕ Implement a stateless REST API with API-key authentication and easy key rotation. ⭕ Develop an ERC-20 event listener running on Ethereum mainnet and testnets. ⭕ Validate all incoming requests and outgoing responses strictly against JSON Schema. ⭕ Integrate with a trusted ETH payment gateway or custom smart contracts to automate transfers to domestic and international bank accounts. ⭕ Provide comprehensive unit tests and clear deployment documentation for Ubuntu servers. ❓ Could you please clarify your preferred ETH payment gateway or if you want custom smart-contract logic? ❓ What bank APIs or services are we integrating for ACH, SEPA, and SWIFT payouts? ❓ Do you have key management preferences for API keys rotation and storage? I am confident in delivering a secure, production-ready USDT-to-bank gateway service that meets your specifications and passes your end-to-end testing. Best regards, Nam
$550 USD in 5 days
5.4
5.4

Hello! I am a US-based senior software engineer with extensive experience in Python, mobile app development, and blockchain technologies. I carefully read your project description regarding the USDT Wallet-to-Bank Gateway and have a solid understanding of your requirements. I am confident that my 15 years of expertise in building production-grade software makes me the right fit for this project. To ensure I deliver exactly what you need, could you please clarify the following questions to help me better understand the project? 1. What specific bank integration or payment gateways do you have in mind for the USDT deposits? 2. Are there any security protocols or compliance measures you want to prioritize in this service? My approach will involve defining clear milestones, developing secure APIs, and ensuring the service is scalable and maintainable. I have successfully worked on similar projects, like a crypto wallet integration for a financial services app and a payment processing system for an e-commerce platform. I understand the importance of delivering a solution that meets your business goals while remaining user-friendly. I am committed to clear communication and quality results. Let’s discuss how we can turn your vision into a reality. Looking forward to the opportunity to collaborate! Best regards, James Zappi
$600 USD in 5 days
5.3
5.3

Hello, I see you want a small service that listens for USDT deposits and pushes confirmed funds straight to bank accounts. The flow is clear and the need for schema checks and key-based auth makes sense. I have built blockchain-to-bank bridges before and can put this together in a clean, minimal setup. I would deliver: • ERC‑20 watcher on mainnet and testnets • Stateless REST API with key rotation • JSON Schema checks for all payloads • Automatic transfer calls for ACH, SEPA, and SWIFT • Tests, examples, and a short Ubuntu guide I can start right away and have a working version in a few days. Do you already have a preferred banking API for ACH, SEPA, and SWIFT, or should I select a unified provider that supports all three? Regards, Slavko
$250 USD in 6 days
4.9
4.9

You want a production-ready bridge that watches ERC-20 USDT deposits, validates them, waits for confirmations, then moves cleared funds to a bank—fully automated and auditable. I can build that. The real risks are timing and trust: missed confirmations or weak key management cause lost or premature payouts. Fixing those is where most projects fail, not the basic plumbing. I recently built a Node.js ERC-20 listener for a crypto payroll startup that validated deposits on mainnet/testnets and triggered bank rails via a custody API—same flow you describe, in production. My plan: a small Node.js service (Express + web3/ethers) that exposes a stateless REST endpoint with API-key lookup + rotation, strict JSON Schema validation with ajv, on-chain confirmation watcher (configurable confirmations via Alchemy/Infura/QuickNode), and a payout adapter for custody providers (Fireblocks/BitGo) or a direct bank API for ACH/SEPA/SWIFT. Deliverables: source, Postman/Curl examples, Ubuntu deployment guide, and unit tests. I’ll scope and implement in ~7 days for $500. Do you have a preferred custody/payment provider (Fireblocks/BitGo/Currencycloud) or should I wire a generic adapter so you can plug one in later?
$500 USD in 7 days
4.8
4.8

Hello there, we are a team of Senior Full Stack Web developers and we can do this project in no time. Thanks Ashish Kumar.
$900 USD in 7 days
5.1
5.1

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