FONE / Branded stablecoin payment software
StableIn Payments is a white-label EVM stablecoin payment platform for payment startups and SaaS providers. Launch under your own brand with checkout, merchant operations, payment notifications and refund workflows.
Tech stack
Solidity payment contracts for Ethereum Virtual Machine (EVM) networks connect ERC-20 stablecoin checkout and refunds to a TypeScript/NestJS merchant backend, with Foundry contract tests.
For payment startups, SaaS platforms and software teams serving online merchants.
Your payment network
Checkout · Merchants · Payments
FONE / SIGNATURE ENGINEERING
PAYMENTS
THE DELIVERY BEHIND YOUR NEXT MOVE
Helping 5+ payment startup and SaaS teams launch branded stablecoin checkout.
Teams supported
Stablecoin payment launchesEngineering hours saved per client, on average
Checkout · webhooks · refund reconciliationArchitecture and delivery, directly with the builder
Your direct engineering partnerSource, validation and setup, assembled around your selected modules.
A DELIVERY SCENARIO
Payment platforms & merchant-service teams
A software team wants to launch a branded stablecoin checkout service for its merchant network. Start with the connected payment journey, then tailor onboarding, integrations and fee rules to the business.
More time onboarding merchants. Less time rebuilding checkout.
CLIENT FEEDBACK
“We wanted to build a payment business, not spend the entire launch rebuilding checkout and refund reconciliation. Starting with a complete workflow finally let our team focus on merchant acquisition and brand operations.”
Choose the product modules, branding and integrations around your launch.
Walk through setup, the codebase and release checks directly with Fone.
Add ongoing maintenance and iteration support as your product grows.
THE BUSINESS FLOW
Integrate checkout with an existing website.
Buyers review the quote and pay.
Signed notifications connect payment and fulfillment.
Manage platform fees, payment records and refunds.
FROM FIRST CLICK TO BUSINESS OUTCOME
Explore the real product, one customer moment at a time. Screens show a demo workspace with sample data.
THE BUSINESS IN ACTION / 01
Payment tools become valuable when merchants can run their day from them. Receipts, fees and refunds sit together, so your service remains useful after the first transaction.
THE BUSINESS IN ACTION / 02
The buyer sees what to pay and when it is confirmed. Your merchant gets a branded checkout journey they can put in front of customers.
THE BUSINESS IN ACTION / 03
Connect confirmed payments to merchant systems with signed notifications, retries and deduplication. Build the handoff to subscriptions, downloads or order fulfillment around the merchant’s workflow.
THE BUSINESS IN ACTION / 04
Start the integration conversation with a concrete guide and SDK path. Reuse the payment foundation across the websites and services your customers already run.
THE BUSINESS IN ACTION / 05
A refund is part of merchant service. Linked records make the money trail understandable, so support can move the conversation forward.
BUSINESS MODEL
Build your merchant offering around processing fees, with a clear split between merchant receipts and platform fees.
Offer merchant setup, website integration and tailored order workflows as services alongside your payment platform.
Use payment records, notification recovery and refunds to support merchants beyond the first transaction. Shape ongoing support around their operations.
Start with source delivery and brand customization. Add maintenance when you need it, and shape your own customer pricing and operating model.
BUILT BY FONE / 0xF1
Work directly with Fone, the independent engineer behind this product. Discuss the business, review the code and shape the release with the same person.
Meet the builderTHE ENGINEERING BEHIND IT
The Solidity payment router uses OpenZeppelin’s reentrancy guard. The supplied checks exercise payment confirmation, signed notifications and refund reconciliation.
SEE IT BEFORE YOU BUILD
Use these product screens as the start of a live walkthrough. Review source, business flows and verification records with the person who built them.
Walk through the productWHAT WE CAN ADAPT
Adapt checkout, languages, merchant presentation and the post-payment return experience.
Connect digital delivery, account access, order systems and refund-related entitlement changes.
Scope target chains, assets, wallet compatibility, fees, monitoring and deployment support.
SEE THE PRODUCT IN ACTION
The refreshed walkthrough follows merchant receipts, a completed checkout, order notifications and refunds. Explore the interfaces alongside the SDK and integration records.
Walk through the product with Fone, then map the brand, modules and integrations your business needs.
Screens use a Demo EVM workspace and sample merchants. Target assets, networks and wallet support are selected for your deployment. Refunds are funded by the owner and retain the original platform fee; merchant fulfillment and access changes use your integration.
Screens captured on 30 October 2026. Source snapshots, reproduction steps and product verification records are available for the technical walkthrough.
Explore the decisions behind these workflows before planning your own integration.
WHAT YOU CAN RECEIVE
Checkout, merchant portal and a separate operations console, with the selected source modules.
API and worker services, payment contracts, SDK / React SDK and a sample merchant integration.
Agree the deployment configuration, database setup, integration notes, test evidence and acceptance checklist before work starts.
Choose the modules for your first release. We’ll put source access, licenses, setup, handover and optional support into one clear proposal.
Payment startups and software service providers. Build your own merchant payment service with stablecoin checkout, order notifications and refunds. Adapt the existing software to your brand and merchant integrations.
Merchant payment services and agreed processing fees. See revenue options, costs and current scope.
Yes. The SDK and sample merchant integration provide a starting point. Your backend remains responsible for the order amount, notification verification and fulfillment.
Yes. Build your branded version around the agreed modules: Solidity payment contracts; React checkout / merchant apps + Vue operator source; NestJS API, SDK and merchant integration examples. The proposal specifies repository access, commercial-use licensing, setup documentation, available tests and deployment materials, plus the handover with Fone. Third-party components retain their own licenses; exclusive IP transfer, if needed, is agreed separately.
No. The owner funds the amount returned to the original payer; the current implementation retains the original platform fee. Revoking access is a separate merchant integration.
Start with your website stack, target EVM network and assets, order fulfillment and refund rules. Fone maps the reusable modules and integrations into a first-release plan with milestones, workflow tests and deployment checks. The launch date follows that scope and any separately arranged security review. Budget for hosting, RPC access, transaction fees and any merchant-system services. Maintenance and further development are optional, with their scope and price agreed separately.
StableIn Payments / FONE
Show me your merchant journey. We’ll map the checkout, order integration and branded workspace your first release needs.
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