The complete reference for the filtrat API is at api.filtrat.io/v1/docs. It lists every public endpoint with its parameters, request and response fields, examples and what it costs. You can also open it from the API docs button at the top of the API page in the app.
Try calls from the reference
The reference has a built-in console, so you can send real requests without writing code:
- Open an endpoint, for example Verify an email.
- Enter your API key in the authentication field (the key alone, starting with
ak_). - Fill in the body and send the request.
When you create a key in the app, the Copy your key window has a Try it in the API docs link. It opens the reference with that key already filled in.
Calls from the console are real. They run on your account and spend credits the same way as any other request.
What's in it
Endpoints are grouped the way the app is:
| Group | What you can do |
|---|---|
| Verification, Bulk Verification | Verify one address or a whole list, resolve catch-alls, re-verify old lists |
| Email Finder, Bulk Finder | Find emails from a name and domain, or from a LinkedIn profile; one or many |
| Lead Lists, Company Lists | Create lists, add and remove rows, find emails, find decision-makers, export |
| Search people, companies, posts, events, jobs and groups; read profiles | |
| Lead Capture | Save people from a Sales Navigator search, a post or an event into a list |
| Monitors & Watchers | Watch profiles, company pages, keywords, posts, events, groups and activity |
| AI Enrichment, ICP Scoring | AI columns and scoring against your ICPs |
| Exclusion Lists | Upload and check do-not-contact lists |
| Domain Intelligence | Inspect a domain's mail setup and look up its email pattern |
| AI Settings | Use your own AI key |
| Account, API Keys | Balance, usage, plan, and managing keys |
The reference also covers the n8n templates and MCP connection settings.
Common workflows
| Goal | Steps |
|---|---|
| Clean a list | POST /v1/bulk/jobs/from-list → poll GET /v1/bulk/jobs/{job_id} → GET /v1/bulk/jobs/{job_id}/rows |
| Find emails for many people | POST /v1/bulk-finder/jobs/from-list → poll GET /v1/bulk-finder/jobs/{job_id} → GET /v1/bulk-finder/jobs/{job_id}/rows |
| Leads from a search, post or event | POST /v1/capture-jobs/ → poll GET /v1/capture-jobs/{job_id} → GET /v1/leads/lists/{list_id}/leads |
| Leads at target companies | POST /v1/company-lists → POST /v1/company-lists/{list_id}/companies → POST /v1/company-lists/{list_id}/find-decision-makers |
| Score a list | GET /v1/icp → GET .../score/estimate → POST .../score → poll GET .../score-jobs |
Machine-readable spec
The reference is generated from an OpenAPI specification, available at https://api.filtrat.io/openapi.json. You can import it into an API client such as Postman or Insomnia, or generate a client library from it.
Where to start
New to the API? Read the API quick start first, then Authentication, Long-running jobs and Errors.