ISBNdb Key API

API key management

Operations 1

GET /key #

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/isbndb-key-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.

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

OpenAPI Specification

isbndb-key-api-openapi.yml Raw ↑
openapi: 3.2.0
info:
  title: ISBNdb API v2 Key API
  description: "Definition of ISBNdb.com API v2.\n\n***Note: A 404 Not Found response for an ISBN lookup typically\nindicates that the book information is not yet available in our database.\nHowever, due to frequent updates, there is a high probability that the data will be \nadded shortly, often within a minute or up to 24 hours. We recommend trying your request \nagain after a while, as the information may soon become accessible***\n"
  version: 2.7.0
servers:
- url: https://api2.isbndb.com
  description: API Endpoint
tags:
- name: Key
paths:
  /key:
    get:
      operationId: get_app_api_key__invoke
      responses:
        '200':
          description: Returns key details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/KeyResponse'
      security:
      - ApiKeyAuth: []
      tags:
      - Key
components:
  schemas:
    PlanLimit:
      required:
      - total
      - spent
      - left
      properties:
        total:
          type: integer
        spent:
          type: integer
        left:
          type: integer
      type: object
    KeyResponse:
      required:
      - api_host
      - plan_limit
      - plan_name
      properties:
        api_host:
          type: string
        plan_limit:
          $ref: '#/components/schemas/PlanLimit'
        plan_name:
          type: string
      type: object
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      name: Authorization
      in: header