# Zeller

**Canonical:** https://apis.io/providers/zeller/  
**Website:** https://www.myzeller.com/au  
**APIs profiled:** 3

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.

## Kin Score — 32.2 / 100 (thin)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 32.2).

| Facet | Score |
|---|---|
| Discoverability | 83.3 |
| Contract Quality | 0.0 |
| Governance | 18.2 |
| Contract Governance | 18.2 |
| Operational Transparency | 2.6 |
| Developer Ergonomics | 40.5 |
| Commercial Clarity | 46.1 |
| Access Clarity | 46.1 |

Regulatory layer — **Payments**: 59.4 (matched via tags).

## Agent readiness — 8.5 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## APIs (3)

- **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)

- **Zeller Developer MCP server**

## Security (2)

- **Zeller Authentication** — oauth2/openIdConnect · 1 scheme
- **Zeller Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Payments, Australia, Payment Gateway, Payment Processing, Acquiring, Merchant Services, Point-of-Sale, In-Person Payments, Tap to Pay, SME

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/zeller/). Scores are computed from the provider's own public artifacts under a published rubric.