Building Stablecoin Infrastructure In-House vs Using RebelFi: The Honest Comparison
We get this question from every CTO we talk to. Some version of: "Why wouldn't we just build this ourselves?"
It's a fair question. If you're running engineering at a fintech, your instinct is to own your stack. You've been burned by vendors before — the ones who promise flexibility and deliver lock-in. The ones whose "enterprise" support means a shared Slack channel and a 72-hour SLA. We get it.
So here's the honest answer. We're going to lay out exactly what it takes to build stablecoin infrastructure in-house — the team, the timeline, the costs, the ongoing maintenance. Then we'll tell you what we handle and what it costs. And we'll tell you when building in-house is the right call, even though that's not in our commercial interest to say.
No vendor does this. We think that's a mistake. The CTOs we want to work with are smart enough to figure it out on their own anyway. Might as well be the ones who save them the research time.
What "Stablecoin Infrastructure" Actually Means
Before comparing build vs. buy, let's define what we're talking about. "Stablecoin infrastructure" is frustratingly vague. Here's the specific stack:
1. On-Ramp/Off-Ramp Integration Converting fiat (EUR, USD, GBP) to stablecoins and back. This involves banking relationships, API integrations with on-ramp providers (Bridge, MoonPay, Ramp, Zero Hash, etc.), and FX handling.
2. Wallet and Key Management Generating, securing, and managing blockchain wallets. This includes private key storage, access control policies, backup and recovery, and multi-signature schemes for high-value operations.
3. Settlement Engine The logic that moves stablecoins between wallets — from your treasury to client vaults, from client vaults to yield strategies, from yield strategies back to client vaults for withdrawal. Transaction construction, signing, broadcasting, and confirmation monitoring.
4. Yield Engine Deploying stablecoins into yield-generating strategies (institutional lending markets, structured products, etc.), monitoring positions, rebalancing, and unwinding when liquidity is needed. Risk management for each yield source.
5. Ring-Fencing and Compliance Per-client asset segregation, KYT (Know Your Transaction) monitoring, Travel Rule compliance, sanctions screening, and regulatory reporting.
6. Monitoring and Ops Blockchain health monitoring, transaction status tracking, alerting for anomalies, dashboards for treasury and compliance teams, audit trails.
That's the stack. Now let's price it out both ways.
The In-House Build: What It Actually Takes
We've watched three companies attempt this in the past 18 months. Two succeeded (sort of — they're operational but spending significantly more on maintenance than they expected). One abandoned the project after 8 months and $600K in sunk costs. Here's what the realistic build looks like.
Team
You need specialists. This isn't work you can hand to your existing backend team and expect production-quality results in a reasonable timeframe.
Role | Count | Annual Cost (USD) | Why You Need Them
Blockchain/Solana engineer | 2 | $180K-220K each | Smart contract development, on-chain integration, transaction engine
Security engineer | 1 | $180K-250K | Key management, wallet security, penetration testing
DevOps/infrastructure | 1 | $150K-200K | Node operation, monitoring, high-availability deployment
Compliance/crypto-regulatory | 1 | $160K-220K | MiCA/GENIUS Act compliance, TFR implementation, regulatory reporting
Product manager | 0.5 | $80K-100K (half allocation) | Roadmap, requirements, coordination
QA engineer | 1 | $120K-160K | Testing for financial-grade software is not optional
**Total team cost** | **6.5 FTEs** | **$1.05M-$1.37M/year** |
These are US/Western European salary ranges. You can reduce costs with remote talent in Eastern Europe, Latin America, or Southeast Asia — realistically 30-50% savings. But the specialized blockchain engineer market is globally competitive, so the discount is smaller than you'd expect for the most critical roles.
Timeline
Here's the development timeline we've observed across the companies that built in-house. These are not our estimates — they're actuals.
Phase | Duration | What Gets Built
Research and architecture | 6-8 weeks | Blockchain selection, protocol evaluation, architecture design, vendor selection for on-ramp
Core wallet infrastructure | 8-12 weeks | Key management, wallet generation, transaction signing, basic monitoring
On-ramp/off-ramp integration | 6-8 weeks | API integration with banking partners, fiat conversion flows, KYC/AML integration
Settlement engine | 8-10 weeks | Transaction construction, broadcasting, confirmation, retry logic, error handling
Yield integration | 10-14 weeks | Protocol integration, position management, risk monitoring, rebalancing logic
Ring-fencing and compliance | 6-8 weeks | Per-client vaults, KYT integration, Travel Rule, regulatory reporting
Security audit | 8-12 weeks | External smart contract audit (you cannot skip this), penetration testing, remediation
Testing and hardening | 6-8 weeks | Load testing, failure scenario testing, chaos engineering, UAT
**Total** | **58-80 weeks** | **~14-18 months to production**
Fourteen to eighteen months. That's with a dedicated team, clear requirements, and no major architectural pivots. The companies we watched all had at least one pivot — usually when they discovered that their initial yield strategy integration was more complex than expected, or when a security audit uncovered issues that required architectural changes.
One-Time Costs Beyond Salary
Cost | Range | Notes
Smart contract audit | $100K-300K | You need at least one from a reputable firm (Trail of Bits, OpenZeppelin, Halborn, etc.). Two audits is better.
Legal opinions | $50K-100K | MiCA compliance opinion, Article 50 yield legality opinion, TFR analysis
On-ramp integration fees | $20K-50K | Setup fees, testing environments, compliance onboarding
Infrastructure (first year) | $30K-60K | RPC nodes, monitoring tools, backup systems, HSMs for key management
Insurance | $50K-150K | Cyber insurance, errors and omissions, crime coverage
**Total one-time** | **$250K-$660K** |
Ongoing Maintenance
This is the cost that catches people off guard. Building the infrastructure is a project. Maintaining it is a permanent operating expense.
Ongoing Cost | Annual Range | Notes
Team retention | $1.05M-1.37M | Your blockchain engineers will get recruited. Budget for retention.
Infrastructure | $36K-72K | Nodes, monitoring, security tools
Audit refreshes | $50K-150K | Annual re-audit of smart contracts after any changes
Compliance updates | $30K-80K | Regulatory changes (MiCA technical standards, new ESMA guidance) require implementation
Protocol monitoring | $20K-40K | Yield protocols change, get exploited, or sunset. You need to monitor and adapt.
Incident response | $0-$200K+ | Hopefully zero. But budget for at least one significant incident per year.
**Total ongoing** | **$1.19M-$1.91M/year** |
Total Cost of Ownership: In-House (3 Years)
Category | Year 1 | Year 2 | Year 3 | 3-Year Total
Team | $1.2M | $1.2M | $1.2M | $3.6M
One-time costs | $450K | — | — | $450K
Ongoing non-salary | $136K | $186K | $186K | $508K
**Annual total** | **$1.79M** | **$1.39M** | **$1.39M** | **$4.56M**
That's $4.56M over three years at the midpoint. Your actual number could be $3M if you hire efficiently and nothing goes wrong, or $6M+ if you hit a security incident that requires emergency remediation.
The RebelFi Approach: What It Costs
Full transparency. Here's our pricing model and what you get.
What We Handle
Yield engine. We deploy your stablecoin float into institutional-grade yield strategies on Solana. We manage the protocol integrations, risk monitoring, rebalancing, and unwinding. You don't need to understand the DeFi stack.
Ring-fenced vaults. Per-client isolated vaults with on-chain auditability. Your compliance team can verify segregation at any time.
Settlement infrastructure. USDC transfer logic, confirmation monitoring, retry handling. You interact via API.
Compliance infrastructure. KYT monitoring, Transaction screening, audit trail generation. We don't replace your compliance team — we give them the tools and data they need.
Monitoring and reporting. Real-time dashboards, yield reporting per client, transaction history, anomaly alerts.
What You Still Handle
We're not a turnkey solution for everything. You still own:
On-ramp/off-ramp. You choose your banking partner and on-ramp provider. We integrate with them, but the relationship is yours.
Client-facing product. Your UX, your brand, your client communication.
Regulatory authorization. Your CASP license, your compliance team, your regulatory reporting. We provide the data; you file the reports.
Business logic. When to deploy funds into yield, how much to keep liquid, what risk tolerance to set — these are your decisions. We execute the strategy you define.
Pricing
We operate on a revenue-share model tied to yield generated. You don't pay us a platform fee. You don't pay setup costs. We earn a percentage of the yield we generate for your clients' float.
The economics work out to roughly:
You keep 70-80% of the yield generated
We keep 20-30% (this covers our infrastructure, engineering, risk management, and compliance tooling)
No minimum commitment. Start with one corridor, scale when you're ready.
No setup fee. Integration is API-based. Most teams integrate in 2-4 weeks.
Total Cost of Using RebelFi (3 Years)
This depends entirely on your volume. Let's model three scenarios.
Monthly Float | Annual Yield (at 4.5% APY) | RebelFi's Share (25%) | Your Net Yield | Your "Cost"
$1M | $45K | $11.25K | $33.75K | $11.25K
$10M | $450K | $112.5K | $337.5K | $112.5K
$50M | $2.25M | $562.5K | $1.69M | $562.5K
At $1M monthly float, you're "paying" us $11.25K per year from yield that you wouldn't have earned at all without the infrastructure. Your net position: +$33.75K per year versus the zero you'd earn without stablecoin yield.
At $10M monthly float, you're "paying" us $112.5K per year. Compare that to the $1.79M first-year cost of building in-house. You'd need to run RebelFi for 16 years before the total cost exceeds the in-house build.
At $50M monthly float, the math shifts. You're paying us $562.5K per year. The in-house build costs $1.79M in year one and $1.39M in subsequent years. By year 3, you've paid us $1.69M versus $4.56M in-house. We're still cheaper. But at this scale, the gap narrows enough that building in-house starts to make strategic sense — not for cost reasons, but for control reasons.
When Building In-House Makes Sense
Here's the part where we tell you not to use us.
You should build in-house if:
You're processing $100M+ in monthly stablecoin volume. At this scale, the yield is large enough that our revenue share exceeds what you'd pay a full-time team. The unit economics flip. You should own the stack.
Stablecoin infrastructure is your core product. If you're a stablecoin issuer, a crypto-native neobank, or a company whose primary value proposition is blockchain financial infrastructure — you need to own it. Using a third party for your core product is a strategic vulnerability.
You have specific yield strategy requirements we don't support. Our yield engine targets institutional-grade, low-risk strategies. If you want to deploy into higher-risk DeFi protocols, structured products with custom terms, or strategies that require bespoke smart contract development — you'll need your own team.
Regulatory sovereignty is non-negotiable. Some companies — particularly those operating under central bank supervision or managing government-adjacent funds — need to own every piece of their infrastructure stack for regulatory reasons. If your regulator requires that all transaction processing happens on infrastructure you control, a third-party yield provider doesn't work.
You have the team already. If you've already hired blockchain engineers and security specialists for other reasons, the marginal cost of adding stablecoin infrastructure is lower than our model above suggests. You're already paying the salaries.
You should use RebelFi if:
You want yield-on-float without building a blockchain engineering team. Most fintechs don't need blockchain engineers for their core business. They need payment infrastructure that happens to use blockchain under the hood. That's what we provide.
You want to go live in weeks, not months. Our API integration takes 2-4 weeks. An in-house build takes 14-18 months. If the market opportunity is now, the speed matters more than the architecture purity.
Your volume is under $50M monthly. Below this threshold, the cost of an in-house team exceeds our revenue share by a wide margin. The math is unambiguous.
You want to validate the business case before committing to infrastructure. Start with RebelFi to prove the economics work. If yield-on-float becomes a material revenue line, then evaluate building in-house with real data instead of projections.
You'd rather your engineers build product features than maintain yield infrastructure. Every engineer maintaining smart contracts and blockchain nodes is an engineer not building features your customers see. Opportunity cost is real.
The Hybrid Approach
Some of our best partnerships are hybrids. The fintech owns the pieces they have opinions about and outsources the pieces they don't.
Common splits:
They own: on-ramp, client UX, compliance reporting. We own: yield engine, ring-fencing, settlement.
They own: wallet infrastructure, key management. We own: yield strategy execution, protocol monitoring, risk management.
They own: everything above the blockchain layer. We own: everything on-chain.
This is actually how we think it should work long-term. We don't want to be a black box between you and your clients' money. We want to be the infrastructure layer that handles the parts you don't want to specialize in — the same way you use Stripe instead of building your own card processing, or AWS instead of running your own data centers.
Want to see the numbers for your specific volume? We'll model the build-vs-buy comparison using your actual float data. No NDA required for the initial conversation. Book 30 minutes and bring your treasury numbers.
Risk Comparison
Cost isn't the only factor. Risk profiles differ significantly between the two approaches.
Risk Category | In-House | RebelFi
**Smart contract exploit** | You bear 100% of loss. Your audit quality determines your exposure. | We bear the infrastructure risk. Our contracts are audited by [firm name] and we carry coverage.
**Key management failure** | Private key compromise = total loss of funds in affected wallets. Your security team's competence is the only protection. | We use institutional-grade HSMs and multi-sig. Key management is our core competency.
**Yield protocol failure** | If a protocol you've integrated gets exploited, you lose the deployed funds and need to explain it to clients. | We monitor and manage protocol risk continuously. We diversify across strategies and can unwind positions within hours.
**Regulatory change** | You need to interpret and implement every regulatory update yourself. MiCA technical standards are still being published. | We track regulatory changes and update our infrastructure. You still own your own compliance, but the infrastructure adapts.
**Team departure** | If your two blockchain engineers leave, you're stuck. Replacements take 3-6 months to hire and ramp. | Our team is our problem. Your operations continue uninterrupted.
**Vendor risk** | None — you own everything. | If we go down, your yield operations stop. Ring-fenced client funds remain accessible on-chain (they're not in our custody), but yield generation halts until you find an alternative or we recover.
That last row is the one our prospects worry about most, and they should. Vendor dependency is real. Here's how we mitigate it:
On-chain transparency. Your client vaults are on Solana. You can see every balance, every transaction, every yield position directly on the blockchain. There's no information asymmetry.
No custody lock-in. We don't hold your funds. We manage yield strategy execution through smart contracts that you can audit. If we disappeared tomorrow, your funds are in vaults you can access with your own keys.
Exportable positions. We provide tools to unwind all yield positions and return funds to base vaults. This process is documented and tested. We run it quarterly as part of our own disaster recovery testing.
Contractual SLAs. Uptime commitments, incident response timelines, and termination terms are in the contract. Our agreements comply with DORA Article 30 requirements for ICT third-party providers.
Is this as secure as owning everything yourself? No. But it's a known, bounded, and contractually defined risk. Compare that to the unbounded risk of maintaining smart contracts with a team of two engineers and hoping your annual audit catches everything.
What the CTOs We Work With Actually Say
We asked three CTOs who evaluated build-vs-buy and chose to work with us why they made that decision. Their answers were remarkably consistent.
The first — a payments company in the Netherlands — said: "We spent two months scoping the in-house build and realized we'd need to hire five people we didn't have budget for, for a feature that might generate $200K in its first year. The math didn't work."
The second — a neobank in Lithuania — said: "I've built blockchain infrastructure before, at a previous company. I know exactly how hard it is. I didn't want to do it again for something that isn't our core product."
The third — a UK-based treasury management platform — said: "We actually started building in-house. After four months, we'd spent $180K and were maybe 30% done. We switched to RebelFi and were live in three weeks." (We wrote a detailed version of a similar story in our European payment company case study.)
We won't pretend everyone chooses us. Some companies do build in-house, and some of them build excellent infrastructure. The ones who succeed typically have $50M+ in monthly volume, an existing blockchain engineering team, and a multi-year commitment from their board.
FAQ
What happens if RebelFi goes out of business? Your stablecoin funds are in ring-fenced on-chain vaults, not in our bank account. If we ceased operations, you would retain access to your vault keys and could withdraw funds directly from the blockchain. Active yield positions would need to be unwound — we provide documentation and tooling for this as part of our disaster recovery package. It's not zero-friction, but your funds are not at risk of disappearing with us.
Can I switch from RebelFi to in-house later? Yes, and we've designed for this. Our contracts have no long-term lock-in. If you outgrow our model (typically at $50M+ monthly volume) and want to bring infrastructure in-house, we'll help with the transition. We'd rather have a successful alumni than a resentful captive client.
How does RebelFi make money if there's no setup fee? We take a revenue share of the yield generated. If we don't generate yield, we don't get paid. This aligns our incentives perfectly — we're motivated to maximize your yield, manage risk well, and keep the infrastructure running. We think fee-based pricing for yield infrastructure creates the wrong incentives.
What if yield rates drop to near zero? If risk-free rates collapse and stablecoin yield drops below 1-2%, the economics of the entire model — in-house or with us — become marginal. In that scenario, you're not losing money by using us (no fixed fees), but the revenue line shrinks for everyone. We hedge this risk by diversifying across yield sources, but we can't manufacture yield in a zero-rate environment.
Do you support stablecoins other than USDC? We currently support USDC and EURC on Solana. USDT support is on our roadmap but deprioritized due to regulatory uncertainty in the EU under MiCA. If your primary use case requires USDT, let us know — we'll give you an honest assessment of whether we're the right fit or whether you need to look elsewhere.
What's your uptime track record? We've maintained 99.95% uptime on our yield infrastructure since launch. The 0.05% downtime was a planned migration, not an outage. Our settlement infrastructure has had zero unplanned downtime. We publish a status page and provide real-time monitoring access to all clients.
The Decision Framework
Strip away all the details, and the build-vs-buy decision for stablecoin infrastructure comes down to three questions:
Is stablecoin infrastructure your core product? If yes, build it. If no, buy it (or at least start with buying it).
Do you have $50M+ in monthly float? If yes, the economics of building start to work. If no, they don't.
Do you have 14-18 months to wait? If yes, building is an option. If the market window is smaller than that, it's not.
For 90% of the fintechs we talk to, the answer is: no, no, and no. They're not stablecoin companies. They're payment companies, neobanks, and treasury platforms that want to add yield-on-float as a feature. They don't have $50M in monthly float yet (though some are growing toward it). And they want to be live this quarter, not next year.
If that's you, we should talk. And if that's not you — if you're the 10% that should build — we'll tell you that too. We'd rather be honest and earn trust than close a deal that doesn't make sense.
Check out our Stablecoin Payments 101 guide for the full technical primer, or our float yield calculator to model the revenue opportunity before deciding how to capture it.
