Now onboarding founding merchants

Watch your money move.

Flat-fee card processing with no hidden charges. Every payment moves through explicit states you can see, track, and audit. Customers pay normally. You know exactly where every penny is.

Visa + Mastercard
Apple Pay + Google Pay
UK-registered
Full audit trail
Payment #pay_9f3a21
LIVE
A
Acme Ltd
test@acme.co.uk · Visa ยทยทยทยท4242
FUNDS_CONTROLLED
£149.00
Fee £2.68 (1.8%)  →  You receive £146.32
10:14CHECKOUT_CREATED Payment link sent to customer
10:15PAYMENT_RECEIVED Customer paid £149.00 with Visa
10:17FUNDS_CONTROLLED Operator confirmed funds held
Waiting for your approval to settle
Next: Approve settlement
Live
1.8%
Founding merchant rate
1,325
Automated tests passing
7
Explicit money states
0
Hidden charges
PRICING

One fee. No surprises.

A flat percentage. Nothing else. No per-transaction fixed fee, no cross-border uplift, no monthly minimum, no surprise add-ons. The number on the tin is the number you pay.

2%
flat per transaction

Standard rate after founding period. Same terms, same transparency.

  • No fixed per-transaction fee
  • No monthly minimum
  • No cross-border or FX uplift
  • No refund fee
  • No chargeback markup
Get started

Do you know your effective Stripe rate?

Stripe UK charges 1.5% + 20p per transaction. But the actual cost after surcharges, international card fees, and add-ons typically lands between 2.3% and 2.8% for UK SaaS businesses. That gap is real money. Send us a screenshot of your Stripe fees page for any month and we will calculate your effective rate.

Send us your Stripe fees screenshot
CHECKOUT

This is what your customers see.

Fast, clean, familiar. Card details, Apple Pay, Google Pay. No account creation, no redirects, no friction. Your brand colours. Conversion-optimised by default.

Hosted on pay.fluxapay.co.uk

Customer never leaves a secure Fluxa page

Works on every device, every browser

Fluxa hosted checkout
HOW IT WORKS

One glance. Complete clarity.

Fluxa sits between payment collection and business payout. Every stage of money movement is explicit, logged, and visible to operators in real time.

1
card · Apple Pay · Google Pay

Customer pays

Familiar checkout. No account creation. Visa and Mastercard accepted. Apple Pay and Google Pay supported.

2
explicit states

Fluxa ledger

Money moves through states you cannot skip. Every step is logged to a timeline with operator identity attached.

3
operator confirmed

Business payout

Approve settlement, queue payout, mark sent. Deliberate actions, clear trail, concurrent safety built in.

Why it matters: it prevents silent financial mistakes. Every penny accounted for at every stage.
Result: reconciliation in minutes, not days. Disputes resolved from a single timeline.
FEATURES

Simple by design.

Infrastructure that helps businesses control money movement properly. Built for SaaS, digital products, and any company where payment reliability is non-negotiable.

Hosted checkout

Fast, clean, conversion-optimised. Visa, Mastercard, Apple Pay, Google Pay. No Fluxa account needed for customers.

Explicit state machine

Seven money states, each enforced and logged. Received, controlled, approved, queued, completed, refunded, failed.

Operator controls

Token-based auth, session management, role-based access. Every action tied to an operator identity in the audit trail.

Refund lifecycle

Full refund flow with reason tracking and double-refund protection. Cannot refund after payout. Every refund logged.

Anomaly detection

Intelligent monitoring watches for unusual patterns, failed settlements, stuck payouts. Surfaces issues before operators notice.

Full audit trail

Every action logged with operator IDs, timestamps, and a complete timeline. Reconciliation trivial. Disputes easy to resolve.

Concurrent safety

Bank-grade idempotency. Multiple operators can approve simultaneously, only one payout executes. Proven under race conditions.

Dry-run preview

Preview any dangerous action before committing. See exactly what will change without touching the database.

Request tracing

Every API call tracked with a unique request ID. Full correlation from checkout creation to payout completion.

DASHBOARD

This is what you see.

Revenue, payouts, trust score, AI insights, and every transaction. All in one place. Answer any question within 10 seconds of opening the dashboard.

Fluxa merchant dashboard
MONEY STATES

Every penny. Accounted for.

One valid action at a time. Fluxa does not let you skip steps. Seven explicit states, each transition enforced, logged, and permanent.

PAYMENT_RECEIVED
FUNDS_CONTROLLED
SETTLEMENT_APPROVED
PAYOUT_QUEUED
COMPLETED
REFUNDED
FAILED

Why explicit states?

Most payment systems treat money as "in" or "out." That is where mistakes hide. Fluxa forces every stage to be acknowledged, making reconciliation trivial and disputes easy to resolve.

1,325 automated tests across 16 test suites verify every state transition, every guard, every edge case, and concurrent race conditions. The state machine is proven in code, not promised in a pitch deck.

SECURITY

Built to be trusted.

Every layer of Fluxa is hardened. Automation surfaces issues. Humans approve money movement. No mystery decisions.

Auth and session control

Token-based authentication. Session invalidation on logout. Operator identity tied to every action in the audit trail.

Rate limiting

Per-operator and per-endpoint rate limits. Prevents abuse, brute force, and runaway automation. Returns clear error codes.

Circuit breaker

If an external service fails, Fluxa stops retrying and fails safely. No silent errors. No cascading failures.

Human approval requiredEvery transfer reviewed and approved by an operator before money moves.
Complete audit trailsEvery action logged with operator IDs, timestamps, and full state history.
No black boxesWe expose exactly what our monitoring flags and why.
Double-action protectionBank-grade concurrency. Multiple operators can act, only one payout executes.
Dry-run previewPreview any dangerous action before committing. See what changes first.
Request tracingEvery API call tracked with a unique ID. Full correlation from checkout to payout.
FAQ

Straight answers.

Do customers need a Fluxa account?+
No. Customers pay normally with their card, Apple Pay, or Google Pay. No account creation, no extra steps. Fluxa is invisible to the end customer.
What payment methods do you support?+
Visa and Mastercard, which covers roughly 98% of UK card transactions, plus Apple Pay and Google Pay which tokenise existing Visa and Mastercard cards.
What is the fee structure?+
A flat percentage per transaction. 1.8% for founding merchants (locked for 12 months), 2% standard after that. No hidden charges, no monthly minimums, no per-transaction fixed fee. One number, nothing else.
How is this different from Stripe?+
Stripe UK charges 1.5% + 20p, but effective rates for UK SaaS typically land between 2.3% and 2.8% once surcharges and international card fees are included. Fluxa charges a flat percentage with no add-ons. You also get explicit money states, a full operator audit trail, and human-approved money movement by default.
How do refunds work?+
Refunds are a first-class state. Every refund requires a reason, is logged to the timeline, and has double-refund protection built in. You cannot refund a payment after payout has been sent.
What happens if two operators approve at the same time?+
Only one payout executes. Fluxa has bank-grade concurrent safety built into the database layer. Multiple operators can click approve simultaneously and the system guarantees exactly one transfer.
Who is Fluxa built for?+
UK-based SaaS companies, digital product businesses, and any company processing card payments where transparency, reliability, and a clear audit trail matter more than having 200 payment methods you will never use.
How fast do payouts arrive?+
Payouts are initiated daily after operator approval. Funds typically arrive in your bank account within 1-2 working days via Faster Payments. You can see the exact status and ETA in the dashboard at all times.
How hard is it to integrate?+
One API call to create a checkout session. You get back a hosted payment URL. No frontend SDK, no PCI scope, no webhook maze. Integration is straightforward and we will walk you through it.
Can I test before going live?+
Yes. Every merchant gets full sandbox access before going live. Test the entire payment flow end-to-end with real API calls and simulated card processing.
GET STARTED

Ready to see it work?

We are onboarding founding merchants now. Drop your email and we will reply personally. No pitch deck, no demo booking form. Just a conversation about your payments.

Got it. We will be in touch shortly.
Or email us directly: support@fluxapay.co.uk Follow: @fluxapay LinkedIn