The gateway that routes every transaction to its optimal path.
Kweller connects your business to 15+ acquirers and 20+ payment methods through a single API — with intelligent routing, multi-currency processing, and a white-label option for platforms.
Everything you need in one integration.
Kweller's infrastructure is built for payment service providers, platforms, and merchants who need control, uptime, and flexibility without building everything themselves.
One API to reach every acquirer in our network. Normalises communication, handles 3DS2, tokenisation, and reconciliation — so you don't have to.
- Unified REST API across all acquirers
- PCI DSS Level 1 certified
- Native 3DS2 authentication
- Card & token vault
- Real-time webhooks
- Sub-100ms processing
Our Routing Experts pick the best acquirer on pre-defined levels — maximising approval rates and minimising processing costs simultaneously.
- Cost-based & approval-rate routing
- BIN-level routing rules
- A/B split testing
- Merchant-defined overrides
We share connections with a global banking network, so that you could open B2B accounts, make transfers and foreign exchange seamlessly.
- Tailormade Banking Solutions for growth driven companies. Flexible and Reliable.
Every millisecond, the smartest acquirer.
Our routing engine analyses live cost, real-time approval rates, and acquirer health for every single transaction — no static rule tables, no manual updates.
20+ methods. One connection.
Cards, digital wallets, bank transfers, and local methods — all through a single Kweller integration.
Sell globally. Settle locally.
Accept payments in 150+ currencies and settle in the currency that works for your business — with live FX rates, transparent fees, and automatic reconciliation.
Your brand. Our infrastructure.
Launch a fully branded payment experience for your platform, marketplace, or enterprise customers — powered by Kweller, invisible to your users.
Built by people who know payments from the inside.
Kweller was founded by payment engineers who spent years building acquirer integrations, routing systems, and fraud tools at some of Europe's largest PSPs — and kept hitting the same walls. So we built the infrastructure we always wished existed.
We're headquartered in Vienna, with engineering teams in Amsterdam and Warsaw. Our stack is cloud-native, our API-first philosophy means every feature we build is available to every integration — no special tiers, no feature gates.
Today Kweller processes over two billion euros annually for PSPs, platforms, and enterprise merchants across 28 countries. We're growing — but deliberately. We only onboard partners we can genuinely support at scale.
Ready to upgrade your payment stack?
Talk to a Kweller solutions engineer. We'll map your acquirer setup, identify routing opportunities, and get you live quickly.