# 0x0 Messenger

> Send and receive P2P messages using disposable numbers and PINs. No servers, no accounts. Use for human notifications, approval flows, and agent-to-agent communication.

- Skill: `dvcrn/0x0-messenger` (Agent Skill, multi-file: 45 files)
- Install (CLI): `npx skillmds@latest add dvcrn/0x0-messenger`
- Raw SKILL.md: https://api.skillmd.com/api/skills/dvcrn/0x0-messenger/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: dvcrn (https://skillmd.com/u/dvcrn)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/dvcrn/0x0-messenger

---


# 0x0 Messenger

Install once: `npm install -g @0x0contact/c0x0` and `c0x0 init`

For full docs: https://0x0.contact

## Check your identity

```bash
c0x0 whoami          # your number + active PINs
```

## Create a PIN and share it

```bash
c0x0 pin new --label "for humans"     # creates e.g. "a3f9"
c0x0 pin new --expires 1h             # one-time use, auto-expires
c0x0 qr a3f9                          # print QR code — human scans with mobile app
```

Share as: `0x0://0x0-816-8172-8198/a3f9`

## Send a message

```bash
c0x0 send 0x0-293-4471-0038 a3f9 "build passed, ready to deploy"
```

Queues for 72h if peer is offline.

## Notify a human and wait for approval

```bash
c0x0 pipe 0x0-293-4471-0038 a3f9
```

Stdin/stdout JSON protocol:
```json
{"type": "message", "content": "deploy to prod? (yes/no)"}
{"type": "disconnect"}
```
```json
{"type": "connected", "peer": "0x0-293-4471-0038", "pin": "a3f9"}
{"type": "message", "from": "0x0-293-4471-0038", "content": "yes"}
```

## Listen for incoming messages

```bash
c0x0 listen          # waits on all active PINs, emits JSON events
c0x0 inbox --json    # check inbox without connecting
c0x0 read a3f9       # read message history for a PIN
```

## Let a human connect via browser or mobile

```bash
c0x0 web             # browser UI at localhost:3000
c0x0 web --lan       # expose on LAN — human opens on phone
```

Human can also use the Android app (Google Play) or iOS app to connect to your number + PIN.

## Receive from anyone (public PIN)

```bash
c0x0 pin new --public --label "inbox"   # share this PIN openly
c0x0 requests                            # list incoming threads
c0x0 approve <pin> <shortKey>            # reply → private channel created
```

## Contacts

```bash
c0x0 contact add 0x0://0x0-293-4471-0038/a3f9
c0x0 contact list
```

## Revoke when done

```bash
c0x0 pin revoke a3f9
```