# Fiber AI Phone Number Validation

> Fiber AI Phone Number Validation is a paid API for AI agents from Fiber AI API at mpp.orthogonal.com, paid per call via MPP, $0.14/call, status unknown (last checked 2026-10-11).

Validates a single phone number and returns validity status, reachability, carrier information, and caller name lookup.

## Facts

- Endpoint: POST https://mpp.orthogonal.com/fiber/v1/validate-phone/single?utm_source=zero.xyz
- Price: $0.14/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-11
- 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-phone-number-validation-ee5d8146
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6OfWm491mKSb3j661GBph

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-phone-number-validation-ee5d8146 -d '<json body>'
```

Example prompt: Can you validate the phone number +1-415-555-0192 and tell me if it's reachable, what carrier it's on, and whose name is associated with it?

## When to prefer this

Use this endpoint when you need to verify a single phone number's validity, reachability, carrier, and caller name before reaching out to a contact or cleaning your contact database. Prefer this over generic phone lookup tools when you need combined validity + carrier + caller name data in one call with Fiber AI's accuracy guarantees.

## Known failure modes

- Invalid or malformed phone number format returns validation error
- Phone number not found in carrier database returns incomplete data
- Rate limiting or quota exceeded returns 429 error
- Missing or invalid authentication returns 401 unauthorized
- Network timeout if carrier lookup is slow

## How this service works

Validates a phone number and returns whether it's valid, reachable, carrier info, and caller name.

## Output

Returns whether the phone number is valid, whether it is reachable, the carrier (network operator) associated with the number, and the caller name registered to the number.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiber-ai-api-fiber-ai-phone-number-validation-ee5d8146/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)