@Filter Signal Engine API
Programmatic access to real-time content filtering intelligence from the @Filter community. All data reflects anonymous, aggregated user behavior with differential privacy protections.
Observer
Fixed endpoints for dashboards and integrations
- 6 fixed GET endpoints
- 30 requests/minute
- Top keywords, trending, geo heat map
- Keyword & domain timeseries
- Keyword activity tracking
- Webhook alerts for spikes
Analyst
Flexible queries for researchers and data teams
- Everything in Observer, plus:
- 120 requests/minute
- Flexible POST /signals/query
- Filter + group by 9 dimensions
- Up to 5 dimensions, 1,000 results
- CSV export
Professional
AI-powered queries via MCP for Claude, Cursor, VS Code
- Everything in Analyst, plus:
- 300 requests/minute
- MCP server (7 AI tools)
- Natural language queries via Claude
- Works with Cursor and VS Code
- Priority support
7 API Endpoints
RESTful JSON API with OpenAPI 3.1 specification available at /api/v1/openapi
| Endpoint | Method | Min. Tier |
|---|---|---|
Top Keywords /api/v1/signals/top-keywords | GET | Observer+ |
Keyword Timeseries /api/v1/signals/keyword-timeseries | GET | Observer+ |
Domain Timeseries /api/v1/signals/domain-timeseries | GET | Observer+ |
Geo Heat Map /api/v1/signals/geo-heat | GET | Observer+ |
Trending Detection /api/v1/signals/trending | GET | Observer+ |
Keyword Activity /api/v1/signals/keyword-activity | GET | Observer+ |
Flexible Query /api/v1/signals/query | POST | Analyst+ |
Built for
Security Analysts
Monitor trending topics and sentiment shifts in real-time. Set webhook alerts for spikes in specific keywords or domains.
Researchers
Query filtering behavior across 9 dimensions with flexible grouping. Export to CSV for analysis in R, Python, or Excel.
AI Developers
Use the MCP server to give Claude, Cursor, or VS Code direct access to filtering intelligence via natural language.
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