Listnr

Listnr Agent API

Discovery and authentication hints

GitHub OpenAPI

Operations 4

1 of 4 operations are conformant: apis.io called them with no credentials and the responses matched this contract. Checked 2026-11-12. how this works · status file

GET / API service descriptor conformant #
GET /videos List user videos (protected) #
POST /oauth/token Exchange an authorization code #
POST /handoffs Create a Studio create-handoff URL #

Documentation

📖
Documentation
https://listnr.ai/text-to-speech-api
📖
APIReference
https://github.com/team-listnr/text-to-speech-api

Specifications

⚙
OpenAPI
https://artifacts.apis.io/listnr/openapi/listnr-agent-api-openapi.yml

Other Resources

🔗
PostmanCollection
https://artifacts.apis.io/listnr/collections/listnr.postman_collection.json
🔗
OpenCollection
https://artifacts.apis.io/listnr/collections/listnr.opencollection.json
🔗
APIsJSON
https://artifacts.apis.io/listnr/apis.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/listnr:listnr-agent-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

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

listnr-agent-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Listnr Studio Agent API
  version: 1.0.0
  description: Public read API for Listnr Studio. Catalog, pricing, and docs are anonymous. Video generation is not performed on this host; send people to /create?tool=. Anonymous reads are capped at 60 requests per IP per minute on /api/v1, /mcp, and /ask (20 writes). Exceeding the cap returns 429 with RateLimit and Retry-After.
  contact:
    name: Listnr Studio
    email: support@listnr.ai
    url: https://studio.listnr.ai/contact
servers:
- url: https://studio.listnr.ai/api/v1
  description: Public sandbox (read-only)
security: []
tags:
- name: Agent
  description: Discovery and authentication hints
paths:
  /:
    get:
      operationId: getApiRoot
      tags:
      - Agent
      summary: API service descriptor
      description: Returns collections, docs, and authentication pointers.
      responses:
        '200':
          description: Service descriptor
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ServiceDescriptor'
        '429':
          description: Too many requests from this IP. Honor RateLimit and Retry-After.
          headers:
            RateLimit:
              schema:
                type: string
              description: IETF RateLimit header, e.g. limit=60, remaining=0, reset=12
            RateLimit-Policy:
              schema:
                type: string
            Retry-After:
              schema:
                type: integer
              description: Seconds to wait before retrying
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /videos:
    get:
      operationId: listStudioVideos
      tags:
      - Agent
      summary: List user videos (protected)
      description: Protected collection. Anonymous calls receive 401 with WWW-Authenticate pointing at resource metadata. Generation is not available here.
      security:
      - bearerAuth:
        - videos:write
      responses:
        '401':
          description: Bearer auth required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Too many requests from this IP. Honor RateLimit and Retry-After.
          headers:
            RateLimit:
              schema:
                type: string
              description: IETF RateLimit header, e.g. limit=60, remaining=0, reset=12
            RateLimit-Policy:
              schema:
                type: string
            Retry-After:
              schema:
                type: integer
              description: Seconds to wait before retrying
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /oauth/token:
    post:
      operationId: exchangeStudioToken
      tags:
      - Agent
      summary: Exchange an authorization code
      description: Token endpoint declared for agents. The public host does not mint generation credentials. Retry with the same Idempotency-Key to avoid duplicate exchanges.
      parameters:
      - $ref: '#/components/parameters/IdempotencyKey'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                grant_type:
                  type: string
                code:
                  type: string
      responses:
        '400':
          description: Token is not issued on the public host
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Too many requests from this IP. Honor RateLimit and Retry-After.
          headers:
            RateLimit:
              schema:
                type: string
              description: IETF RateLimit header, e.g. limit=60, remaining=0, reset=12
            RateLimit-Policy:
              schema:
                type: string
            Retry-After:
              schema:
                type: integer
              description: Seconds to wait before retrying
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
  /handoffs:
    post:
      operationId: createStudioHandoff
      tags:
      - Agent
      summary: Create a Studio create-handoff URL
      description: Idempotent write that returns a /create?tool= URL. It does not generate video or charge credits. Retry with the same Idempotency-Key to receive the original handoff.
      parameters:
      - $ref: '#/components/parameters/IdempotencyKey'
      - name: toolId
        in: query
        required: false
        schema:
          type: string
        description: Catalog tool id. Defaults to prompt-to-video.
      responses:
        '201':
          description: Handoff created or replayed
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Handoff'
        '429':
          description: Too many requests from this IP. Honor RateLimit and Retry-After.
          headers:
            RateLimit:
              schema:
                type: string
              description: IETF RateLimit header, e.g. limit=60, remaining=0, reset=12
            RateLimit-Policy:
              schema:
                type: string
            Retry-After:
              schema:
                type: integer
              description: Seconds to wait before retrying
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    ServiceDescriptor:
      type: object
      properties:
        name:
          type: string
        docs:
          type: string
          format: uri
        openapi:
          type: string
          format: uri
    Error:
      type: object
      required:
      - error
      properties:
        error:
          type: object
          required:
          - code
          - message
          properties:
            code:
              type: string
            message:
              type: string
            hint:
              type: string
            docs:
              type: string
              format: uri
            auth:
              type: string
              format: uri
    Handoff:
      type: object
      required:
      - toolId
      - createHref
      - url
      properties:
        toolId:
          type: string
        createHref:
          type: string
        url:
          type: string
          format: uri
        billed:
          type: boolean
  parameters:
    IdempotencyKey:
      name: Idempotency-Key
      in: header
      required: false
      schema:
        type: string
      description: Client-supplied key for write retries. Repeating a POST with the same key returns the original result instead of creating a duplicate.
  securitySchemes:
    bearerAuth:
      type: oauth2
      description: Session or agent token. Catalog GET routes do not require it.
      flows:
        authorizationCode:
          authorizationUrl: https://studio.listnr.ai/login
          tokenUrl: https://studio.listnr.ai/api/v1/oauth/token
          scopes:
            tools:read: Read tools
            catalog:read: Read catalog
            docs:read: Read docs
            videos:write: Reserved for authenticated Studio projects; not granted on the public host
x-provenance:
  method: harvested
  publisher: Listnr
  source: https://studio.listnr.ai/openapi.json
  note: split by refine-openapis from the provider's own published document, verified by fetch (openapi/_original/*.fetch.json);
    stamped by stamp-openapi-provenance.py (roadmap#793)