Zeller
Zeller is a Melbourne-founded Australian payments and business banking company (founded 2020 by former Square Australia executives Ben Pfisterer and Dominic Yap) that gives SMEs an integrated stack of card payment acceptance, a transaction account, a Mastercard debit card, and financial management tools in one place. As a merchant acquirer it processes in-person and online card payments (Visa, Mastercard, eftpos, American Express, JCB, Apple Pay, Google Wallet) across its Zeller Terminal hardware, Tap to Pay on mobile, and online checkout, positioning itself against Square and fellow ASX-adjacent acquirer Tyro. Zeller reached unicorn status on a 2022 Series B. Its API posture is developer-account-gated: the Zeller Developer Suite ships Payments SDKs (React, React Native, Windows .NET, Android, iOS) plus Terminal, Online, and Tap to Pay integration APIs, with reference documentation unlocked only after creating a free developer account. The developer portal authenticates through an Auth0 (OAuth2 / OpenID Connect) tenant; no OpenAPI specification is published for anonymous download.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Zeller the way a machine reads it — 6 machine-readable artifacts across 3 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Zeller scores 35.2/100 (thin), with a separate agent-readiness read of 25/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Zeller
Each block below is one kind of artifact we hold for Zeller. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 3
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Zeller Terminal API
Connect point-of-sale software directly to Zeller Terminal hardware to initiate and manage in-person card payments. Delivered through the Zeller Payments SDK (React, React Nativ...
Zeller Online Payments API
Accept payments inside web and mobile apps via Zeller's Online integration. Part of the Zeller Developer Suite; access to full API documentation is by request behind a free deve...
Zeller Tap to Pay API
Accept contactless card and mobile-wallet payments on a phone with no separate terminal, integrated through the Zeller Payments SDK. Documentation is gated behind a free Zeller ...
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
zeller-mcp.yml
MCP SERVERSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Zeller — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/zeller · machine-readable index on apis.io