# Atomic Authentication API

**Canonical:** https://apis.io/apis/atomic-financial/atomic-authentication-api/  
**Provider:** Atomic — https://apis.io/providers/atomic-financial/  
**Base URL:** https://api.atomicfi.com  
**Documentation:** https://docs.atomicfi.com/reference/api

Atomic Authentication API is one of 7 APIs that [Atomic](https://apis.io/providers/atomic-financial/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Authentication, StandardAuth, TrueAuth, and CoAuth. The published artifact set on APIs.io includes an API reference and API documentation.

Atomic's authentication layer powers user-permissioned access to third-party payroll, employer, and merchant systems. Three flavors are supported - StandardAuth (credential / 2FA proxy), TrueAuth (deviceless, fully automated), and CoAuth (assisted authentication for hard-to-reach systems).

## Machine-readable artifacts (2)

- **APIReference** — https://docs.atomicfi.com/reference/api
- **Documentation** — https://docs.atomicfi.com/reference/transact-sdk

## Other Atomic APIs (6)

- [Atomic Deposit API](https://apis.io/apis/atomic-financial/atomic-deposit-api/)
- [Atomic Verify API](https://apis.io/apis/atomic-financial/atomic-verify-api/)
- [Atomic PayLink API](https://apis.io/apis/atomic-financial/atomic-paylink-api/)
- [Atomic Tax API](https://apis.io/apis/atomic-financial/atomic-tax-api/)
- [Atomic Webhooks API](https://apis.io/apis/atomic-financial/atomic-webhooks-api/)
- [Atomic Transact SDK](https://apis.io/apis/atomic-financial/atomic-transact-sdk/)

## Tags

Authentication, StandardAuth, TrueAuth, CoAuth

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