Crypto Payment Gateway & Stablecoin API Integration
Cross-border settlement through banks is slow and expensive. Hurain Technologies builds multi-chain crypto payment gateways and stablecoin APIs that let businesses accept Bitcoin, Ethereum, USDT, USDC and other digital currencies directly, settling in minutes instead of days with instant conversion and built-in AML screening.
Quick answer
Which cryptocurrencies can the gateway accept?
Bitcoin, Ethereum and major stablecoins by default; additional chains can be added based on your markets. Our crypto payment gateway work is handled by in-house DBA, development and hosting teams with 15+ years of experience, overseen by founder Shahnavaz Syed, who has built software since 2010 and 15+ in-house products. Pricing starts at US$20–40 per hour; final charges and timeline are set after we confirm your requirements, and depend on your budget and the team members assigned to the project.
Reviewed by Shahnavaz Syed, Founder · Last updated
Overview
What crypto payment gateway & stablecoin api integration actually involves
Stablecoins have quietly become one of the most practical payment rails available for cross-border business, precisely because they solve the specific problem correspondent banking is worst at: settling value across jurisdictions in minutes rather than days, without a chain of intermediary banks each taking a cut and adding delay. For businesses operating in markets where card and wire infrastructure is thin, unreliable, or simply doesn't reach — remittance corridors, emerging markets, cross-border marketplaces — a well-built stablecoin gateway can be the difference between serving a market and not.
The engineering challenge isn't accepting a crypto payment, which is straightforward; it's building the surrounding infrastructure that makes crypto acceptance operationally boring — automatic fiat conversion so your treasury team doesn't need to actively manage crypto exposure, AML screening on every transaction so you're not unknowingly processing funds from a sanctioned or high-risk address, and settlement logic reliable enough that finance can close the books at month-end without a reconciliation nightmare.
The Challenge
Problems we see teams struggling with
Cross-border payment friction
Traditional wires are slow, expensive, and limited to banking-friendly markets.
Limited market access
Card and wire infrastructure doesn't reach unbanked regions where crypto provides a clear alternative.
No unified crypto/fiat checkout
Offering crypto alongside traditional payment methods requires disconnected integrations.
Compliance & settlement risk
Customer balances must be screened and settled reliably without custody overhead.
Volatility exposure from holding crypto
Businesses that don't convert incoming crypto to fiat quickly take on price risk they never intended to carry.
Reconciliation complexity across chains
Accepting payments across multiple blockchains without a unified settlement layer turns month-end reconciliation into a multi-system nightmare.
Our Approach
How Hurain Technologies solves it
Multi-chain gateway
Accept Bitcoin, Ethereum, stablecoins across Ethereum, BNB Chain, Tron, Polygon and more from a single integration.
Stablecoin API
Purpose-built endpoints for USDT, USDC, PYUSD and DAI transfers with automatic fiat conversion.
Instant settlement
Real-time to daily batch settlement, configurable based on your treasury and liquidity needs.
AML/fraud screening
Every transaction screened against sanctions lists and on-chain risk signals before funds release.
Hosted checkout
Drop-in widgets, payment links and e-commerce plugins so you don't build UI from scratch.
Automatic volatility hedging
Configurable auto-conversion to fiat or stablecoin on receipt, so your business isn't carrying price risk on volatile assets it never intended to hold.
Technology
Tech stack we work with
Blockchains
Stablecoins
Backend
Security
Chain and node connectivity is the foundation layer: we run and monitor node infrastructure across each supported chain, with fallback providers so a single node outage doesn't take down payment acceptance. On top of that sits a unified settlement layer that normalizes transactions from every chain into a single internal ledger format, which is what actually makes multi-chain reconciliation manageable instead of a per-chain spreadsheet exercise.
AML screening happens before funds are considered settled, not after: incoming addresses are checked against sanctions lists and on-chain risk signals (exposure to mixers, known illicit addresses, high-risk exchanges) using established chain-analytics providers, and a transaction that fails screening is held rather than released, with your compliance team notified to review it.
Use Cases
Where crypto payment gateway & stablecoin api integration gets used
Cross-border remittance rails
Stablecoin settlement corridors that clear in minutes for businesses moving money between countries where correspondent banking is slow or expensive.
E-commerce crypto checkout
A hosted checkout widget that lets online merchants accept crypto and stablecoins alongside cards, with automatic fiat conversion on receipt.
Marketplace and platform payouts
Paying out sellers, freelancers, or partners across multiple countries in stablecoins instead of managing multiple banking relationships.
Subscription billing in stablecoins
Recurring payment collection in USDT/USDC for platforms serving customers in markets with limited card infrastructure.
B2B invoice settlement
Large-value cross-border invoice payments settled via stablecoin rails in minutes instead of the days a wire transfer typically takes.
Unbanked and underbanked market access
Reaching customers in regions where traditional card and wire infrastructure doesn't provide reliable coverage.
Proof
Results we've delivered
Client Result
A remittance platform needed to launch in 5 markets with crypto rails. Hurain Technologies delivered a multi-chain payment gateway in 10 weeks, now handling steady transaction volume across all five markets with 99.98% uptime.
Process
How an engagement runs
- 1
Market & compliance scoping
Map target markets, transaction volume, and regulatory obligations.
- 2
Gateway architecture
Choose custodial, non-custodial, or hybrid fund flow.
- 3
Blockchain integration
Node connectivity, stablecoin integration, settlement logic.
- 4
AML & compliance
Screening, KYC, and suspicious activity workflows.
- 5
Testing & launch
Load testing, monitoring setup, go-live support.
Engagement Models
How we structure the work
Standard gateway integration
A fixed-scope integration accepting Bitcoin, Ethereum, and major stablecoins, typically delivered in 6-10 weeks.
Multi-market remittance build
A dedicated pod engagement for platforms launching crypto rails across several markets simultaneously, each with its own compliance requirements.
Checkout widget customization
A focused engagement to build or customize a hosted checkout experience matching your existing brand and user flow.
Ongoing compliance and monitoring retainer
Continued AML screening rule updates and settlement monitoring once the gateway is live and processing real volume.
Pitfalls
Mistakes we see teams make
Holding crypto revenue without a conversion strategy
Businesses that don't auto-convert incoming crypto payments take on volatility risk they usually didn't intend to accept as part of running a payments business.
Skipping AML screening to move faster at launch
Screening added after launch, once volume has already grown, is a far riskier and more disruptive retrofit than building it in from day one.
Treating each chain as a separate integration
Building bespoke logic per blockchain instead of a unified settlement layer multiplies engineering and reconciliation effort unnecessarily.
Underestimating node infrastructure reliability needs
Relying on a single node provider per chain creates a single point of failure that can pause payment acceptance during an outage.
Glossary
Key terms explained
- Stablecoin
- A cryptocurrency designed to maintain a stable value, typically pegged to a fiat currency like the US dollar (e.g., USDT, USDC).
- On/off-ramp
- Infrastructure that converts fiat currency into crypto (on-ramp) or crypto back into fiat (off-ramp).
- Chain analytics
- Services that analyze blockchain transaction history to assess an address's risk exposure to illicit activity, sanctions, or known bad actors.
- Settlement
- The point at which a payment is considered final and funds are available to the recipient, distinct from the initial transaction broadcast.
- Node
- A computer running blockchain software that validates and relays transactions, used to read and submit transactions to a given chain.
FAQ
Crypto Payment Gateway — frequently asked questions
Which cryptocurrencies can the gateway accept?
How long does integration take?
Can this integrate with our existing checkout?
Is the gateway PCI-DSS aligned?
Do you handle the fiat conversion, or do we need a separate provider?
How do you screen transactions for AML risk?
Can we accept payments across multiple blockchains without managing each separately?
Do you build the complete crypto payment gateway solution, or only integrate with what we already use?
We are not sure about our budget yet. Can you still help?
Markets We Cover
Crypto Payment Gateway by country
Local regulatory context and delivery details for crypto payment gateway in each market we serve.
Live Demos
A selection of platforms we've designed and built
Real, working builds across fintech, compliance, healthcare, and commerce — the same engineering team would build your crypto payment gateway project.
Nexa
SaaS-style product dashboard and workflow UI for a fintech platform.
Open live demoDebt Management
Debt management and collections tracking platform.
Open live demoUMARSOB Data
Android VTU/data-reseller platform with wallet, agent/referral system, and admin panel.
Open live demoAML Compliance Suite
Anti-money-laundering compliance and case-monitoring suite.
Open live demoHospital Management
Hospital/clinic management system covering patient records, appointments, staff, and billing.
Open live demoDMI CHW App
Offline-first Community Health Worker counseling app with a central management platform, built for an NGO client.
Open live demoHomemakers Pro
Enterprise operations system for a domestic staffing agency covering bookings, staff, and client management.
Open live demoE-Commerce (Multi-Locale)
E-commerce storefront demo with multi-language, locale-based support.
Open live demoMars
Legal web application prototype.
Open live demoBusiness value
What Crypto Payment Gateway & Stablecoin API Integration does for your business
Benefits for your company
- Accept crypto and stablecoins. Let your business customers pay in BTC, ETH, USDT or USDC with automatic confirmation and reconciliation.
- Fast cross-border settlement. Stablecoin rails settle in minutes rather than days and avoid several correspondent-bank fees.
- Fewer chargebacks. On-chain payments are final, which removes card-style chargeback exposure for merchants.
How it can earn or save money
- Processing fees. A gateway operator earns a percentage or flat fee on every payment it processes.
- Conversion spreads. Auto-conversion to fiat or stablecoin adds a spread margin on volume.
- New customer segments. Merchants in markets with weak card access can be reached with crypto checkout.
Illustrative revenue and saving lines, not guaranteed results: outcomes depend on your market, licences and execution.
How we work
How we deliver Crypto Payment Gateway
Every crypto payment gateway engagement follows the same staged, quality-gated process — shaped around your requirements. You see progress every day, review it every week, and give written sign-off at every milestone before any payment is due.
- 01
Discover
Scope signed off- Token & protocol workshops
- Chain & custody selection
- Regulatory scoping
- Signed scope
- 02
Design
Threat model OK- Contract architecture
- Tokenomics & access roles
- Key management design
- Threat model
- 03
Build
Testnet accepted- Solidity / Rust sprints
- Testnet deployments
- Gas optimisation
- Demo every sprint
- 04
Secure & Test
Audit cleared- Unit, fuzz & invariant tests
- Independent audit coordination
- Audit fixes verified
- UAT on testnet
- 05
Deploy
Mainnet live- Mainnet deploy via multisig
- Contract verification
- Monitoring & alerts
- Go-live checklist
- 06
Handover
Keys transferred- Role-based sessions
- Recorded walkthroughs
- Admin & ops runbooks
- Documentation handover
- 07
Support
Monitoring live- Dedicated engineer
- SLA helpdesk
- Patches & upgrades
- Quarterly reviews
Client sign-off at every milestone — you approve the working result before you pay.
You always know what was done today — and what happens next
A written daily update, a weekly work overview and a live demo every sprint — so there are no surprises at milestone time.
Every working day
- What was completed today
- What is planned for tomorrow
- Blockers and decisions needed from you
- Links to builds you can try
Every Friday, with a live call in your business hours
- Features completed and demo recordings
- Progress against the current milestone
- Risks, open questions and change requests
- Plan and priorities for next week
End of every sprint and milestone
- Working software demonstrated live
- Your feedback captured in the backlog
- Quality-gate checklist shared
- Written sign-off before any payment
Payment plan
Pay only for work you have accepted
Milestones are customised to your requirements — six or more is typical, and delivery time is agreed around your scope. Every payment after the advance is released only after you have seen the working result and given written sign-off. Here is an example plan:
| Payment | Milestone & acceptance | Share |
|---|---|---|
| Advance | Contract signing Signed contract; protocol workshops and chain selection. | 10% |
| Milestone 1 | Architecture approved Contract architecture, tokenomics and threat model signed off. | 15% |
| Milestone 2 | Testnet v1 First contracts deployed and demonstrated on testnet. | 15% |
| Milestone 3 | Feature-complete testnet All contracts, dApp and admin flows running end to end. | 15% |
| Milestone 4 | Audit passed Independent audit done; every finding fixed and re-verified. | 15% |
| Milestone 5 | Mainnet launch Multisig mainnet deployment and contract verification. | 15% |
| Milestone 6 | Handover Monitoring, runbooks, training and documentation handed over. | 15% |
| Total | 100% | |
- Number of milestones and splits set around your scope
- Every milestone is a working, demonstrated result
- No payment is due until you sign off
Warranty & annual support
Protected after launch — warranty and annual support for your Crypto Payment Gateway project
Go-live is where your crypto payment gateway product starts earning — so we stay accountable for it. Every project includes a free 90-day defect warranty. After that, the same team that built it keeps it secure, updated and running on a fixed annual fee agreed up front — no open-ended hourly billing, no surprise invoices.
Included free
90-day warranty
Any defect found in the first 90 days after go-live is fixed free of charge.
- Every delivered feature covered
- Fixes tested and deployed to production
- Same engineers who built it
Fixed-cost annual package
30% of project cost
per year for Annual Support & Maintenance, with a dedicated developer assigned to your crypto payment gateway platform. A fixed price, known in advance.
| Service | Included in the annual package |
|---|---|
| Dedicated developer | One named developer assigned to your product for fixes, enhancements and optimisation. |
| Bug fixes & security patches | Critical issues resolved within 24 hours; standard issues within 5 business days. |
| Upgrades & new releases | Framework, library and platform updates plus new versions of what we built, at no additional cost. |
| Helpdesk | Email and phone support for your team and administrators; 4-hour response for critical issues. |
| Backup monitoring | Daily backup checks and a quarterly restore test. |
| Security review | Periodic audit-trail review and security configuration check. |
| On-chain monitoring | Contract events, admin actions and unusual transactions watched with alerts. |
| Network & node upgrades | Hard forks, RPC and library changes tracked; contract upgrades run through the multisig. |
| Settlement monitoring | Confirmations, conversions and merchant settlements checked every day. |
Source code & IP ownership
100% of the source code and IP is owned by you
For every custom crypto payment gateway project, upon full and final payment the complete source code and intellectual property are transferred to you — so you can host, maintain and enhance the system with any developer.
- Smart-contract source, tests and deployment scripts
- Contract ownership and multisig admin keys transferred to you
- Audit reports and dApp / admin source code
- Complete Git repository with full commit history
- Database schemas, migrations and seed data
- Configuration, CI/CD and deployment scripts
- API documentation and a deployment guide
No lock-in
No forced upgrades
No subscription trap
Your code lives in your own repository from the first commit.
Continuous enhancement
Launch is just the beginning — keep shipping with your own dedicated team
Your crypto payment gateway platform should get better every month, not stand still after go-live. Start with one dedicated developer working on your priorities across apps, dashboards and backend — and grow to a full team of developers and support members whenever your roadmap demands it.
Dedicated team, your way
From one developer to a full team
Pricing is based on the team members you need — tell us your requirements and we will quote your team.
- Start any time after launch
- Hire developers as you need them
- Scale up, scale down or pause
What your team can take on after launch
- New stablecoins, chains and settlement currencies
- Merchant plugins and checkout improvements
- Automated conversion and treasury reports
- New contracts, tokens or chains
- dApp and admin-panel improvements
- New wallet, bridge and exchange integrations
Need more hands? Add developers and support members as your requirements grow
Start with one person and add only the roles your crypto payment gateway roadmap needs — each is quoted to your requirements.
Development team
Crypto-payments integration engineer
Adds chains, stablecoins and merchant plugins.
Smart-contract developer
Writes, tests and upgrades contracts in Solidity or Rust.
dApp developer
Builds the wallet-connected web interfaces for your contracts.
Backend developer
Adds the APIs, business logic and data models behind new features.
QA engineer
Writes and runs manual and automated tests before every release.
DevOps engineer
Keeps pipelines, environments and deployments fast and reliable.
Support team
L1 helpdesk support executive
First contact for your users and staff — logs, triages and resolves common issues.
L2 technical support engineer
Investigates bugs, data issues and integrations, and escalates to developers with full context.
Merchant support executive
Helps merchants with payments, settlements and refunds.
On-chain operations support
Watches contracts, gas balances and admin transactions.
Wallet & transaction support
Helps users trace stuck, failed or mis-sent transactions.
Our Approach
Our approach to development methodologies
Our approach to custom software engineering draws on a range of methodologies, each selected to match the needs of your crypto payment gateway project.
Agile Scrum
Best for: Evolving products
Two-week sprints with a working demo at the end of each, so crypto payment gateway priorities can change as you learn from users.
Kanban
Best for: Continuous delivery & support
A visual flow of small tasks with work-in-progress limits — ideal for maintenance, integrations and post-launch improvements.
Fixed-scope (Waterfall-style)
Best for: Well-specified builds
Requirements signed off up front with a fixed timeline and price — best when scope is clear and change is unlikely.
Lean MVP
Best for: New ventures
Build the smallest crypto payment gateway release that proves demand, measure it with real users, then invest where the data points.
DevOps & CI/CD
Best for: Every project
Automated tests, infrastructure-as-code and push-button deployments so releases are frequent, reversible and boring.
Security-by-design (DevSecOps)
Best for: Regulated & high-value systems
Threat modelling, dependency scanning and code review built into each sprint rather than a pen test at the end.
Why we're different
What sets Hurain Technologies apart
Plenty of agencies can build crypto payment gateway. Here is what sets us apart for clients worldwide.
Engineering depth, not a reseller
Your crypto payment gateway project is designed and built by our own in-house engineers — no hidden subcontracting chain between you and the people writing code.
Built for your market, not a template
Payments, tax, language and data-protection requirements for your target market are part of the design from day one instead of retrofitted after launch.
Transparent, senior-led delivery
A named project lead, a shared backlog, fortnightly demos and direct Slack access to the engineers — you always know what is being built and why.
Cost advantage without cutting corners
Delivering from India gives clients worldwide senior engineering at a fraction of typical onshore agency rates, with the same code-review, testing and security standards.
You own everything
Source code lives in your repository from the first commit; IP, infrastructure accounts and documentation transfer to you in full.
We stay after launch
Monitoring, updates and a support SLA mean the team that built your product is the team that keeps it running.
Flexible engagement models
How we work with crypto payment gateway clients worldwide
Ways to work together, depending on how your team and roadmap are set up.
Dedicated Development Team
An extended team of crypto payment gateway engineers, QA and architects working exclusively on your product, managed day-to-day by you with our engineering leadership behind them.
Best for: Long-term products and evolving roadmaps
Fixed-Cost Delivery
A clearly scoped crypto payment gateway build with a defined timeline and price — ideal for a well-specified MVP, integration or launch product.
Best for: MVPs and clearly defined projects
Hybrid Engagement
Keep product and regulatory decisions close to your team while our specialists handle deep engineering remotely, with workshops or on-site visits at key milestones.
Best for: Enterprises and regulated businesses
Why businesses choose us
Why businesses choose Hurain Technologies
16+ years of engineering depth
Custom software engineering with in-house teams across web, mobile, cloud, AI, payments and blockchain.
Security-first by default
Encryption, least-privilege access, audit logs — and MPC/HSM custody and audited smart contracts where money is on-chain — designed in, not retrofitted.
Regulatory-aware architecture
Designed with your target market's regulatory direction in mind and built alongside your licensed local legal counsel.
Direct access, no layers
Direct Slack or Teams access to your development team during the build, and the same people for post-launch support.
Business benefits
What you gain
Faster time to market
An experienced crypto payment gateway team with proven components means your first release ships in weeks, not quarters.
Security-first architecture
Secure from day one, rather than patched after an audit or incident.
Aligned compliance groundwork
Controls, logs and data handling built around your target market's requirements so reviews go faster.
Lower total cost of ownership
Clean, documented, tested code that your own team can maintain — plus post-launch monitoring and support.
What happens next
From your crypto payment gateway enquiry to a working demo — in about a day
- 01Within 10 minutes
We respond to your enquiry
Send your crypto payment gateway enquiry by form, email or WhatsApp — a few lines is enough. Our team replies within 10 minutes, any day, any time, to set up a meeting at a time that suits you.
- 02Requirements meeting
We understand your requirements
In a focused meeting we go deep on your users, features, integrations, timeline and budget — so we build exactly what your business needs. NDAs signed on request.
- 03Within 24 hours
You see a demo of your crypto payment gateway
Within 24 hours of our meeting we prepare and share a demo — so you see your crypto payment gateway taking shape before you commit to anything.
- 04As per your budget
We share a tailored proposal
A clear proposal for your crypto payment gateway project with scope, milestones, team and timeline — shaped around your budget, with no hidden costs and no obligation.
Available 24×7 — three 8-hour shifts, every day
Ready to start your crypto payment gateway & stablecoin api integration project?
Get a response within 10 minutes, a demo within 24 hours of our meeting, and a proposal as per your budget.