This listing is posted by the APIs.io catalog. APIs.io does not own or sell this API; we get access from the provider, Stax.
The Stax Admin API is the admin slice of Stax's public REST API: one documented operation tagged Admin, served from apiprod.fattlabs.com. Stax (formerly Fattmerchant) is an Orlando, Florida payments company. Its wider API covers charges, refunds, stored payment methods and tokenization, customers, invoices, payment links, terminals, merchant onboarding, disputes, deposit reporting, teams, users and API keys, and webhooks. It suits developers at SaaS platforms, ISVs and merchants who need to build payment administration into their own tools.
Published for this API: OpenAPI, Documentation, API Reference, Examples, Data Model, Error Catalog, Webhooks, Agentic Access and APIs.json.
Provider ratings in the catalog: Kin Score 75.7 (exemplar band) and Agent Readiness 53.4 (agent-native band, scored 2026-11-02).
Pricing: set by the provider. The catalog lists access as paid.
Condition: a live hosted API listed in the APIs.io catalog.
Catalog listing: https://apis.io/apis/stax/stax-admin-api/ Provider: https://staxpayments.com/