Acuant

Acuant Liveness API

Passive liveness detection operations

Documentation GitHub OpenAPI

Operations 1

POST /api/v1/liveness Evaluate image for liveness #

Specifications

⚙

OpenAPI

https://raw.githubusercontent.com/api-evangelist/acuant/refs/heads/main/openapi/acuant-liveness-api-openapi.yml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/acuant-liveness-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Acuant Passive Liveness API
  description: Liveness detection API that evaluates a selfie image for presentation attacks including printed photos, masks, deepfakes, and face-swap attacks. Returns a LivenessAssessment (Live, NotLive, PoorQuality, Error) and a confidence score. ISO/IEC 30107-3 compliant with iBeta PAD Level 1 and Level 2 certification. No active liveness challenges required — a single selfie image is sufficient.
  version: '1.0'
  contact:
    name: Acuant Support
    url: https://support.acuant.com
  x-api-id: acuant:passive-liveness
servers:
- url: https://us.passlive.acuant.net
  description: USA Production
- url: https://eu.passlive.acuant.net
  description: EU Production
- url: https://aus.passlive.acuant.net
  description: AUS Production
- url: https://preview.passlive.acuant.net
  description: Preview / Sandbox
security:
- BearerAuth: []
- BasicAuth: []
tags:
- name: Liveness
  description: Passive liveness detection operations
paths:
  /api/v1/liveness:
    post:
      operationId: checkLiveness
      summary: Evaluate image for liveness
      description: Submits a selfie image for passive liveness detection. The API analyzes the image for presentation attack indicators and returns an assessment of whether a live person is depicted. Detects printed photos, masks, screen replays, deepfakes, and face-swap attacks.
      tags:
      - Liveness
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/LivenessRequest'
            example:
              SubscriptionId: a1b2c3d4-e5f6-7890-abcd-ef1234567890
              Image: <base64-encoded-selfie-image>
      responses:
        '200':
          description: Liveness detection result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LivenessResult'
              example:
                LivenessAssessment: Live
                Score: 92.3
                TransactionId: txn-b2c3d4e5
        '400':
          description: Invalid request or poor image quality
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Authentication failure
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: Inactive subscription
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    LivenessRequest:
      type: object
      required:
      - SubscriptionId
      - Image
      properties:
        SubscriptionId:
          type: string
          format: uuid
          description: Acuant subscription identifier
        Image:
          type: string
          format: byte
          description: Base64-encoded selfie image. Recommended minimum resolution for reliable liveness detection.
    Error:
      type: object
      properties:
        Code:
          type: integer
          description: Error code
        Message:
          type: string
          description: Error description
    LivenessResult:
      type: object
      properties:
        LivenessAssessment:
          type: string
          enum:
          - Live
          - NotLive
          - PoorQuality
          - Error
          description: 'Assessment outcome. - Live: The image depicts a live person. - NotLive: A presentation attack was detected. - PoorQuality: Image quality is insufficient for assessment. - Error: Processing error occurred.'
        Score:
          type: number
          format: float
          minimum: 0
          maximum: 100
          description: Confidence score (0-100) for the liveness assessment. Higher values indicate greater confidence in the Live assessment.
        TransactionId:
          type: string
          description: Unique identifier for this liveness check transaction
        Error:
          type:
          - string
          - 'null'
          description: Error description if LivenessAssessment is Error
        ErrorCode:
          type:
          - integer
          - 'null'
          description: Numeric error code if processing failed
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: Bearer token obtained from the ACAS (Cloud Authentication Service).
    BasicAuth:
      type: http
      scheme: basic
      description: HTTP Basic authentication with Acuant credentials.