What mx51 does

mx51 is a Sydney-based payment infrastructure company founded in 2020 that provides a cloud-native, bank-grade, multi-tenant payment platform designed to be white-labelled by banks, acquirers, and payment service providers. The platform powers in-store payments, merchant dashboards, support dashboards, customer insights, disputes management, and reports/eStatements for payment providers who rebrand the technology and offer it to their merchant customers. Underlying technical components include the Simple Cloud Integration (SCI) cloud APIs, SPI client libraries in JavaScript, .NET, Java, and iOS, the Spice Windows middleware, and the Gecko Bank Android virtual terminal for testing. mx51 holds AICPA SOC certification and is architected for security, scalability, and PCI-grade compliance.

The company serves three primary segments in a B2B2C model: payment providers (its core enterprise clients, including Commonwealth Bank and Westpac), POS integration partners (150+ certified integrations including Vend, Lightspeed Kounta, Oracle Micros, and Tower Systems), and merchants (reached indirectly through payment provider branding). Revenue is generated through managed services contracts with payment providers, transaction fees on the $1B+ annualised volume processed through the platform, and API/SDK licensing to POS partners. Distribution is multi-channel: enterprise field sales for tier-1 bank relationships, a channel partner model through the POS integration network, an API-first developer-relations motion via developer.mx51.io, and an OEM/embedded white-label model for payment providers globally.

Operationally, mx51 is privately held (mx51 Pty Ltd, NSW), has 51-100 employees, and has raised a disclosed $57.5 million across 2021 ($25M) and 2022 ($32.5M) funding rounds with investors including Acorn Capital, Artesian VC, Commencer Capital, Hedosophia, Mastercard, and Rampersand. Leadership comprises co-founders Victor Zheng (CEO), Magnus Hsu (COO), and Steven Hadley (CPO), with Varghese Mathew as Chief Customer Officer and Catherine Ward as Head of Delivery & Implementations. The company's processing footprint of 100M+ annualised transactions and $1B+ processed volume indicates meaningful scale in the white-label payment infrastructure segment, with growth signals including expanding POS partner coverage, new product capabilities (Spice middleware enhancements), and channel partnerships such as the January 2026 POSApt alliance targeting Australian hospitality.

Name

mx51

Legal name

mx51 Pty Ltd

Website

https://mx51.io

Company type

Private

Founded year

2020

Operating status

Operating

Headcount range

51–100 employees

Short description

mx51 is a Sydney-based payment infrastructure provider that builds a white-label, cloud-native, multi-tenant platform enabling banks, acquirers, and POS partners to offer integrated payment experiences to merchants globally.

Ownership category

akta.pro rank

Product category

Payment Infrastructure / White-Label Payment Platform

akta.pro primary industry

Merchant-of-Record (MoR) & Payment Facilitation (PayFac) Infrastructure (FSAGABAE)

Keywords

• White-label payments platform
• Payment integration middleware
• EFTPOS terminal software
• POS payment integration
• Merchant payment infrastructure

Headquarters

HQ city

Sydney

HQ country

Australia

HQ region

Oceania

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Personnel, Infrastructure, Operations, Marketing or Sales

Revenue model

1. Platform Licensing and Managed Services: B2B2C revenue model providing white-label payment platform and managed services to payment providers (banks, acquirers). Payment providers white-label mx51's technology to offer payment solutions to merchants under their own brand.
2. Transaction Processing: Revenue derived from transaction volume processed through the platform. As a white-label platform processing payments for payment providers' merchant customers, mx51 benefits from total transaction volume growth.
3. API/SDK Licensing: Providing SDKs and API access to POS integration partners. Developer-facing offerings including certification testing and technical support for partners integrating with the platform.

Go-to-market motion4 records

Distribution channels3 records

Marketing channels6 records

Core offering

mx51 provides a cloud-native, bank-grade, multi-tenant white-label payment platform that enables banks, acquirers, and payment service providers to offer integrated in-store and multi-channel payment experiences to merchants under their own brand. The platform includes SCI/SPI APIs and SDKs for POS-to-EFTPOS integration, the Spice middleware, the Gecko Bank testing terminal, plus merchant and support dashboards, disputes management, customer insights, and reports & eStatements. It is sold via enterprise licensing and managed services to payment providers who then serve their merchant customers.

Differentiator

Problem solved

Functional benefit

Brands

• Spice: Assembly Payments Adaptor software renamed to Spice. A Windows application that acts as middleware between POS systems and EFTPOS terminals, supporting integrated and Pay at Table transactions.
• Gecko Bank
• Simple Cloud Integration (SCI)
• SPI Client Library

Products and services

• In Store Payments Device-agnostic in-store payment terminal software offered as part of mx51's multi-channel white-label platform, enabling payment providers to deliver integrated payment experiences from SMEs to large enterprises via EFTPOS terminals paired through SCI/SPI.
• Merchant Dashboard Smart dashboard that gives merchants a single portal for detailed near real-time reporting and analytics on transactions, white-labelled for payment providers.
• Support Dashboard Smart dashboard for payment providers delivering fleet-wide insights to quickly identify and resolve issues across their merchant base in near real-time.
• Customer Insights Business solutions and analytics product that surfaces actionable customer and merchant insights to help payment providers support merchant growth and engagement.
• Disputes Business solutions product for managing payment disputes end-to-end, helping payment providers streamline administrative activities for merchants.
• Reports & eStatements Business solutions product delivering reports and electronic statements that give merchants detailed transaction records and convenience for reconciliation and administration.
• mx51 Multi-Tenant Payment Platform Bank-grade, multi-tenant data and merchant services platform with segregated software instances and databases per client, sold to payment providers as a white-label OEM/embedded solution.
• Spice Windows middleware application that connects POS systems with EFTPOS terminals, supporting integrated payments, Pay at Table, and features such as multi-terminal support, dark mode, AWS S3 log upload, and H&L Pay at Table integration.
• Simple Cloud Integration (SCI) API Cloud-based payment integration API that enables POS systems to make in-store payments and other transactions via an EFTPOS terminal, with no local installation required. Supports purchases, refunds, MOTO, cashout, tipping, surcharges, pre-authorisation, pay-at-table, and settlement.
• SPI Client Libraries SDKs in JavaScript, .NET, Java, and iOS that enable POS systems to connect with EFTPOS terminals and execute a full range of integrated payment transactions.
• Gecko Bank Virtual Terminal Android virtual terminal application that emulates EFTPOS functionality, enabling POS developers to test integrations and pair terminals without physical hardware.
• L1-L2 Merchant Support Services Managed L1-L2 merchant support services that payment providers can leverage to reduce their own support burden and deliver responsive merchant assistance.

Quantifiable outcome

• 100M+ annualised transactions processed (2025)
• +3 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration70 records

Feature7 records

Partnerships

Eight partnerships are on record, tiered core and flagship.

• POSAptcoreChannel Partner/ Reseller/ Distributor · 8 January 2026POSApt provides free POS system solutions for Australian hospitality businesses through partnerships with payment providers Windcave and mx51. The partnership allows venues to access POS software without monthly fees by establishing merchant facilities directly with payment providers. mx51 manages payment terminals and merchant services while POSApt provides software integration and support.
• Commonwealth BankflagshipTechnology or Integrationmx51 partnered with Commonwealth Bank to develop CommBank Smart Sync and Smart Dash Portal, bringing best-in-class payment technology to merchant customers. This partnership enabled Commonwealth Bank to reimagine the payments experience for their business customers.
• WestpacflagshipTechnology or IntegrationWestpac partnered with mx51 to bring one of the most technologically advanced payment solutions to market. The collaboration delivered fast and seamless payment integration for Westpac merchants through the Westpac Presto platform.
• VendcoreTechnology or IntegrationPOS integration partner enabling Vend POS systems to connect with mx51-powered payment terminals. Part of 150+ partner integrations network.
• Lightspeed KountacoreTechnology or IntegrationPOS integration partner enabling Lightspeed Kounta POS systems to connect with mx51-powered payment terminals.
• Oracle MicroscoreTechnology or IntegrationEnterprise POS integration partner enabling Oracle Micros POS systems to connect with mx51-powered payment terminals. Part of extensive partner network.
• Tower SystemscoreTechnology or IntegrationPOS integration partner enabling Tower Systems POS to connect with mx51-powered payment terminals.
• H&LcoreTechnology or IntegrationIntegration partner for Pay at Table functionality. H&L Pay at Table feature is supported by Spice integration, enabling table-based payment workflows for hospitality venues.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Worldline: European-headquartered global payment services provider with terminal, acquiring, and merchant services. Comparable as a broad incumbent competing for bank and acquirer relationships that mx51 serves through its white-label platform.
• Stripe: Global payment infrastructure platform offering APIs, processing, and increasingly integrated POS (Stripe Terminal) and embedded finance. Competes with mx51 for the integrated payments use case, particularly as Stripe expands bank and PSP partnerships globally.
• Checkout.com: Global payment processing platform serving large enterprises and PSP partners. Competes with mx51 in the high-volume processing and bank/PSP partnership segments, though primarily online rather than integrated EFTPOS.
• Block (Square): Integrated payments and POS provider with both seller-facing (Square) and platform (Cash App, Afterpay) offerings. Competes in integrated POS-to-terminal flows and embedded financial services relevant to mx51's merchant and developer segments.
• Adyen: Global unified commerce platform offering in-store, online, and platform-based payment processing for large enterprises. Targets the same bank/acquirer and large-merchant customers as mx51 with a broader geographic and channel footprint.

Regional players

• Airwallex: APAC-headquartered cross-border payments and banking platform targeting SMEs and platforms. Comparable as a regional fintech infrastructure player expanding globally, though focused on cross-border rather than in-store integrated payments.
• Pin Payments: Australian online payment gateway serving SMBs and platforms. Regional peer sharing the Australian market with mx51 but focused on online payments rather than integrated EFTPOS-to-POS infrastructure.

Direct peers

• Tyro Payments: Australian integrated EFTPOS and payments provider serving SMEs with terminals and integrated POS solutions. Competes head-to-head in the AU in-store integrated payments market that mx51 powers through bank partners.
• Windcave: New Zealand-headquartered payment gateway and EFTPOS terminal provider operating across ANZ. Most direct peer to mx51 — provides payment terminals, merchant services, and integrates with POS systems, and is explicitly partnered with mx51 through POSApt.

Emerging players

• Assembly Payments: Australian payment platform (formerly Assembly Payments, now operating as Zepto) historically related to mx51 through the Assembly Payments Adaptor that became Spice. Adjacent in offering payment infrastructure to platforms and merchants in APAC.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/mx51

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds3 records

Investors9 records

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about mx51