# AgentPhone Sign Up

> AgentPhone Sign Up is a free API for AI agents from AgentPhone at mpp.orthogonal.com, Free, status unknown (last checked 2026-10-11).

Initiates agent account registration by sending a 6-digit OTP to the provided email address and returning a verification_id for subsequent verification.

## Facts

- Endpoint: POST https://mpp.orthogonal.com/agentphone/v0/agent/sign-up?utm_source=zero.xyz
- Price: Free
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Provider: AgentPhone
- Docs: https://api.agentphone.ai
- Website: https://api.agentphone.ai
- Tags: phone, voice, sms, calls, social
- Canonical page: https://www.zero.xyz/c/agentphone-sign-up-4ce0c5b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tLXLw0lxYhf6M0SZfBSfo

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 agentphone-sign-up-4ce0c5b5 -d '<json body>'
```

Example prompt: I want to sign up for AgentPhone so my agent can make calls and send SMS — send a verification code to myemail@example.com to start the registration process.

## When to prefer this

Use this endpoint when an agent needs to initiate a brand-new AgentPhone account for the first time. This is always the first step before verifying OTP, provisioning a phone number, or creating agents on the platform. No authentication is required, making it safe to call as the entry point of the onboarding flow.

## Known failure modes

- Invalid or malformed email address — returns 400 Bad Request
- Email delivery failure — OTP not received, no verification_id usable
- Rate limiting on repeated signup attempts from same email — returns 429
- Server error during OTP generation — returns 500

## How this service works

Start agent signup. Sends a 6-digit OTP to the human's email. Returns a verification_id. No auth required.

## Output

Returns a verification_id string that must be passed to the Verify endpoint along with the 6-digit OTP the user receives in their email, completing the account creation flow.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentphone-sign-up-4ce0c5b5/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)