# Stax API

**Canonical:** https://apis.io/apis/stax/stax-api/  
**Provider:** Stax — https://apis.io/providers/stax/  
**Base URL:** https://apiprod.fattlabs.com  
**Documentation:** https://docs.staxpayments.com/reference/overview

Stax API is published by [Stax](https://apis.io/providers/stax/) on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Payments, Invoicing, Merchant Onboarding, Webhook, and Terminals. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

The Stax REST API (published as "stax-api") exposes 133 operations across 101 paths at https://apiprod.fattlabs.com — the Merchant API for payments, payment methods, customers, invoices, payment links, catalog, terminals, transactions and webhooks, and the Partner API for merchant creation, enrollment, registration data, API-key issuance, disputes and partner-brand webhooks. Authentication is a bearer API key; sandbox and live keys use the same base URL.

## Machine-readable artifacts (10)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/openapi/stax-api-openapi.json
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/overlays/stax-api-overlay.yaml
- **Documentation** — https://docs.staxpayments.com/
- **APIReference** — https://docs.staxpayments.com/reference/overview
- **Examples** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/examples/stax-api-examples.yml
- **DataModel** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/data-model/stax-data-model.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/errors/stax-problem-types.yml
- **Webhooks** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/asyncapi/stax-webhooks.yml
- **AgenticAccess** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/agentic-access/stax-agentic-access.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/stax/refs/heads/main/apis.yml

## Tags

Payments, Invoicing, Merchant Onboarding, Webhook, Terminals

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/stax/stax-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/stax/.