# Virtual Constructs

> Small, precise data tools published on Apify. Pay per event delivered, no
> subscriptions, empty runs free. Stable documented JSON schemas (every field
> always present, null over missing), so the tools work identically for
> humans, schedules, and AI agents calling them over MCP (mcp.apify.com).

## Tools

- [SEC Filing Monitor API](https://www.virtualconstructs.com/tools/sec-filing-monitor):
  New SEC EDGAR filings by ticker, CIK, form type, or full-text phrase, as
  clean JSON with exactly-once delivery. $5 per 1,000 filings. Metadata and
  links, not parsed bodies. Run it: https://apify.com/virtual-constructs/sec-filing-monitor
- [Subprocessor Change Monitor](https://apify.com/virtual-constructs/subprocessor-change-monitor):
  Watches vendor subprocessor pages you supply and reports added/removed/changed
  entries (GDPR Art. 28). $0.05 per check.
- [Telegram Channel Monitor](https://apify.com/virtual-constructs/telegram-channel-monitor):
  Posts from public Telegram channels, no login or API key, incremental cursor.
  $1 per 1,000 posts.
- [Airbnb Search Scraper](https://apify.com/virtual-constructs/airbnb-search-scraper):
  Airbnb search results with prices, ratings, coordinates. $1.50 per 1,000
  listings.

## Guides

- [How to get SEC filing alerts](https://www.virtualconstructs.com/guides/sec-filing-alerts):
  Free options (EDGAR RSS, DIY scripts) and the pay-per-use setup, honestly
  compared, with a 5-minute walkthrough.
- [Pay-per-use alternative to sec-api.io](https://www.virtualconstructs.com/compare/sec-api-io):
  When a subscription EDGAR API is the right buy and when per-filing pricing
  is; the products overlap only at the alerting slice.

## Note for agents

All tools are callable as MCP tools through Apify's MCP server. Billing is
per event with a per-run charge limit the tools respect. Runs that deliver
nothing cost nothing.