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SmallStep Authentication API

Create API tokens

SmallStep Authentication API is one of 6 APIs that SmallStep publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Authentication. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 1 operation across 1 path, and defines 1 schema. It is described by OpenAPI 3.2.0, at version 2025-01-01.

Requests are made against a single base URL, https://gateway.smallstep.com/api.

1 operations 1 paths 1 schemas 1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
2025-01-01
Base URL
https://gateway.smallstep.com/api
Authentication
HTTP Bearer, Mutual TLS
License
Resource Areas
1

Authentication & Security 2

SmallStep Authentication API declares 2 security schemes for authenticating requests. It accepts HTTP bearer tokens (JWT). It requires mutual TLS (mtls). By default, every request must be authenticated.

  • mtls — Use a client certificate issued by a trusted root to get short-lived bearer tokens with the step CLI.

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.

Authentication 1

Create API tokens

POST
/auth
Authenticate
PostAuth body → 201400401403500

Schemas 1

The contract defines 1 schema that model the data the API accepts and returns. The most detailed is error (1 property). Each schema is shown below with its type and property counts.

error
object
1 property 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

smallstep-authentication-api-openapi.yml Raw ↑

Other APIs SmallStep publishes across the network.

SmallStep Certificates API
SmallStep Credentials API
SmallStep Device Inventory API
SmallStep PKI Architecture API
SmallStep Protect API
Where this information came from

This is an independent, third-party profile of SmallStep Authentication API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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