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/send21-io:send21-io-suggestions-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: Send21 Io Suggestions API
  version: v1
  contact:
    name: send21 integration support
    email: integration@send21.io
  description: 'Operations tagged Suggestions across 2 of this provider''s published API definitions: send21-io-openapi.json, swagger.json. Each path carries the servers of the definition it was published in.'
servers:
- url: https://send21.io
security:
- ApiKey: []
tags:
- name: Suggestions
paths:
  /api/v1/suggestions:
    post:
      tags:
      - Suggestions
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SuggestionRequest'
          text/json:
            schema:
              $ref: '#/components/schemas/SuggestionRequest'
          application/*+json:
            schema:
              $ref: '#/components/schemas/SuggestionRequest'
      responses:
        '200':
          description: OK
          content:
            text/plain:
              schema:
                $ref: '#/components/schemas/SentResponse'
            application/json:
              schema:
                $ref: '#/components/schemas/SentResponse'
            text/json:
              schema:
                $ref: '#/components/schemas/SentResponse'
      summary: Create api suggestions
      x-summary-source: derived
      operationId: postApiV1Suggestions
      x-operation-id-source: derived
    servers:
    - url: https://send21.io
components:
  schemas:
    SentResponse:
      type: object
      properties:
        sent:
          type: boolean
      additionalProperties: false
    SuggestionRequest:
      type: object
      properties:
        title:
          type:
          - string
          - 'null'
        description:
          type:
          - string
          - 'null'
      additionalProperties: false
  securitySchemes:
    ApiKey:
      type: http
      description: 'AI-agent API key (Authorization: Bearer s21_...). Humans use passkey session cookies instead.'
      scheme: bearer
      bearerFormat: s21_...
x-refined-from:
- send21-io-openapi.json
- swagger.json