ACI Worldwide
ACI Worldwide (NASDAQ: ACIW) is a US-headquartered payment-software company that builds real-time payment, card, merchant/eCommerce, and bill-payment technology for banks, processors, merchants, and billers around the world. Its enterprise portfolio spans BASE24 card and ATM switching, the ACI Enterprise Payments Platform for real-time and ISO 20022 account-to-account rails, and ACI Speedpay bill payment — most of which ship as licensed, on-premise or hosted software rather than public self-serve APIs. ACI's genuinely API-native surface is the ACI Open Payment Platform (the PAY.ON global payment gateway): a unified RESTful API documented at docs.aciworldwide.com that lets merchants and PSPs accept and manage card and alternative-payment transactions through Server-to-Server, COPYandPAY, Mobile SDK, BackOffice, and Pay By Link integrations, authenticated with an Authorization Bearer access token plus a channel entityId and complemented by PAYMENT and REGISTRATION webhook notifications. Its home market is the United States, inside the deep, fragmented, API-native US payments landscape.
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 ACI Worldwide the way a machine reads it — 8 machine-readable artifacts across 5 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 — ACI Worldwide scores 41.7/100 (thin), with a separate agent-readiness read of 23/100 (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 ACI Worldwide
Each block below is one kind of artifact we hold for ACI Worldwide. 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 5
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.
ACI Open Payment Platform — Server-to-Server API
The core RESTful payment API of the ACI Open Payment Platform (PAY.ON gateway). Server-to-Server integration lets merchants and PSPs run end-to-end payment workflows — preauthor...
ACI COPYandPAY
COPYandPAY is ACI's secure, PCI-friendly embedded payments widget for merchants and integrators. It renders a hosted card and alternative-payment form that tokenizes and submits...
ACI BackOffice API
BackOffice operations on the Open Payment Platform let integrators process and manage previously authorized transactions — captures, refunds, reversals, and related post-authori...
ACI Pay By Link API
Pay By Link lets merchants create secure, customizable hosted payment link pages and collect payments without a full checkout integration, built on the Open Payment Platform gat...
ACI Mobile SDK
The ACI Mobile SDK lets developers accept payments inside native mobile apps, wrapping the Open Payment Platform's card and alternative-payment flows with device-side tokenizati...
Event Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Aci Worldwide Webhooks
ASYNCAPISecurity 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 ACI Worldwide — 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 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
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 3
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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