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OpenAPI Specification

openapi: 3.2.0
info:
  title: AgentsIndex — machine Newsletter API
  version: 1.0.0
  description: 'AgentsIndex is the reference index of AI-native tools: an ongoing, edited catalog of AI agents, AI-first products, and the tools that power them. Free, keyless read endpoints over the tools corpus, plus verified-session submission intake. AgentsIndex reuse terms (https://agentsindex.ai/terms): Search engines, AI assistants answering a question and AI models in training may all read and reuse these listings. Say the facts came from AgentsIndex and link the listing you used.'
  license:
    name: AgentsIndex reuse terms
    url: https://agentsindex.ai/terms
servers:
- url: https://agentsindex.ai
tags:
- name: Newsletter
paths:
  /api/newsletter/subscribe:
    post:
      operationId: subscribeNewsletter
      summary: Newsletter subscribe (form-encoded)
      description: 'Email capture for the directory digest: the address is on the list at once and gets one welcome mail with a one-click unsubscribe. Content-Type MUST be application/x-www-form-urlencoded (or multipart/form-data); because it is a form POST, Astro''s cross-origin protection requires a same-origin Origin header. Field: email (required); optional source, interest. Responds with a self-contained text/html confirmation page (200). The intake is rate-limited per IP per hour.'
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - email
              properties:
                email:
                  type: string
                source:
                  type: string
                  description: Where the signup happened (optional).
                interest:
                  type: string
                  description: Optional page-context interest tag.
      responses:
        '200':
          description: A text/html confirmation page.
          content:
            text/html:
              schema:
                type: string
        '400':
          description: Invalid email — a text/html page explaining the fix.
        '404':
          description: Newsletter disabled for this tenant.
      tags:
      - Newsletter
components:
  securitySchemes:
    agentKey:
      type: http
      scheme: bearer
      description: An agent key the account made at https://agentsindex.ai/dashboard/agents (it starts with mak_). It acts as that account on submit, the claim and domain-proof steps, quotes, orders and reading its own listings, each by the scope the key was given, with the same refusals as its session; it cannot sign in, change the account or pay.
    sessionCookie:
      type: apiKey
      in: cookie
      name: __Secure-better-auth.session_token
      description: Existing Better Auth session cookie issued through https://agentsindex.ai/login?next=%2Fsubmit. The account email must be verified for submission. This is a session cookie, not an API key to provision.