Fiber AI - Count Stealth/Ex-Stealth Startup Founders

Use this endpoint when you want to estimate the size of a stealth or ex-stealth founder audience before committing to a full search or purchase of contact records. It is the right choice when planning outreach campaigns, validating filter combinations, or checking data availability for stealth-stage founders specifically — distinct from general founder or people search endpoints.

• Invalid or malformed search filter parameters returns a 400 error
• Authentication failure returns 401 unauthorized
• Search criteria too broad may return unexpectedly large counts
• Unsupported filter fields return validation errors
• Network timeout on complex queries