Fetchgate Download API

openapi: 3.2.0
info:
  title: Fetchgate Download API
  version: 0.1.0
  summary: Web-content API and x402 digital-goods storefront for AI agents.
  description: 'Fetch clean Markdown or structured metadata from any URL, server-side, with scripts/nav/ad boilerplate stripped out. Also a machine-payable storefront: GET /v1/products for the catalog, GET /v1/buy/:id to pay per product via x402 (USDC on Base) and receive a signed download URL.'
  x-guidance: 'Two independent surfaces. (1) Web reader: GET /v1/read?url=... for Markdown, GET /v1/meta?url=... for structured metadata — free up to 30 calls/day/IP, then $0.002 (/v1/read) or $0.001 (/v1/meta) per call via x402 v2 (send a PAYMENT-SIGNATURE header after receiving a 402; legacy X-PAYMENT is also accepted). (2) Digital-goods store: GET /v1/products lists the catalog (no payment); GET /v1/buy/:id with a real id from that catalog always requires payment — send PAYMENT-SIGNATURE to get a 402 challenge, pay it, and the 200 response carries a time-limited signed downloadUrl to fetch the file from. Everything is also reachable as MCP tools at POST /mcp (read_url, get_metadata, scan_for_prompt_injection, search_x402_services, check_x402_endpoint, check_base_token, list_products, get_purchase_info, get_agent_census, scan_mcp_server).'
  contact:
    email: support@fetchgate.dev
servers:
- url: https://fetchgate.dev
  description: Current host
tags:
- name: Download
paths:
  /v1/download/{id}:
    get:
      operationId: downloadProduct
      summary: Download a purchased product via a signed, time-limited URL from /v1/buy/:id
      security: []
      parameters:
      - name: id
        in: path
        required: true
        description: Product id.
        schema:
          type: string
      - name: exp
        in: query
        required: true
        description: Unix-seconds expiry embedded in the signed URL.
        schema:
          type: integer
      - name: sig
        in: query
        required: true
        description: HMAC-SHA256 signature over `${id}.${exp}`.
        schema:
          type: string
      responses:
        '200':
          description: The product file.
        '403':
          description: Missing, invalid, or expired signature — call /v1/buy/:id again.
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  detail:
                    type: string
                required:
                - error
        '404':
          description: Unknown product id.
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  detail:
                    type: string
                required:
                - error
        '500':
          description: Server misconfiguration or the file is missing in storage.
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                  detail:
                    type: string
                required:
                - error
      tags:
      - Download
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Optional API key for authenticated/paid access. TODO: pay-per-request via x402 is planned as an alternative to a pre-provisioned key.'