# Fiber AI Email-to-Person Reverse Lookup

> Fiber AI Email-to-Person Reverse Lookup is a paid API for AI agents from Fiber AI API at mpp.orthogonal.com, paid per call via MPP, $0.04/call, status unknown (last checked 2026-10-09).

Given an email address, performs a reverse lookup to find the associated LinkedIn profile and personal contact details.

## Facts

- Endpoint: POST https://mpp.orthogonal.com/fiber/v1/email-to-person/single?utm_source=zero.xyz
- Price: $0.04/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-09
- Success rate: 0% of calls made through Zero
- Activations on Zero: 1
- 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-email-to-person-reverse-lookup-ee1bf980
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wp-NtqyP0z2J8YPNNoP0k

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-email-to-person-reverse-lookup-ee1bf980 -d '<json body>'
```

Example prompt: Can you find the LinkedIn profile and personal details for whoever owns the email address john.smith@acmecorp.com?

## When to prefer this

Use this endpoint when you have an email address and need to identify the person behind it, particularly to find their LinkedIn profile or enrich a contact record. Prefer this over LinkedIn search endpoints when the email is your only identifying signal.

## Known failure modes

- Email address not found in Fiber AI database — returns empty or null result
- Invalid or malformed email address — returns validation error
- Email belongs to a generic/role-based address with no person match
- Rate limiting or quota exceeded — returns 429 error
- Insufficient funds or payment failure — returns payment error

## How this service works

Do a reverse lookup: given an email address, find someone's LinkedIn profile and personal details. Note: if you also have the person's name, company, etc., you'll get better results with the Kitchen Sink endpoint, where you can pass all the information you have.

## Output

Returns an enriched person record including LinkedIn profile URL, LinkedIn slug, full name, and personal details associated with the given email address.

## Example request

```json
{
 "email": "test.user@example.com"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiber-ai-api-fiber-ai-email-to-person-reverse-lookup-ee1bf980/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)