# Fiber AI - Count Stealth/Ex-Stealth Startup Founders

> Fiber AI - Count Stealth/Ex-Stealth Startup Founders is a paid API for AI agents from Fiber AI API at mpp.orthogonal.com, paid per call via MPP, $0.02/call, status unknown (last checked 2026-10-10).

Returns the count of stealth or ex-stealth startup founders matching specified search criteria.

## Facts

- Endpoint: POST https://mpp.orthogonal.com/fiber/v1/stealth-founders/count?utm_source=zero.xyz
- Price: $0.02/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Provider: Fiber AI API
- Docs: https://api.fiber.ai
- Website: https://api.fiber.ai
- Tags: contacts, email, phone, enrichment, data
- Canonical page: https://www.zero.xyz/c/fiber-ai-api-fiber-ai-count-stealth-ex-stealth-startup-founders-0519e955
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RJYRkAIJonjtFhAWyuHGg

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fiber-ai-api-fiber-ai-count-stealth-ex-stealth-startup-founders-0519e955 -d '<json body>'
```

Example prompt: How many stealth and ex-stealth startup founders does Fiber AI have on record who are based in the US and working in the AI or fintech space?

## When to prefer this

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.

## Known failure modes

- 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

## How this service works

Count stealth or ex-stealth startup founders matching search criteria.

## Output

A numeric count representing the total number of stealth or ex-stealth startup founders that match the provided search criteria, useful for estimating audience size before fetching full records.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiber-ai-api-fiber-ai-count-stealth-ex-stealth-startup-founders-0519e955/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mpp.orthogonal.com](https://www.zero.xyz/host/mpp.orthogonal.com/llms.txt)