shadow-number
Get a disposable temp phone number and receive OTP codes to sign up on websites without using your real number. Handles x402 crypto payment automatically.
About this skill
The `shadow-number` skill empowers AI agents to acquire temporary, disposable phone numbers for online verification purposes. It automates the entire process of obtaining a number, receiving an SMS/OTP code, and using it to complete sign-ups on various websites like Telegram, Google, WhatsApp, and Twitter. This skill integrates with the Shadow API, automatically managing the necessary x402 crypto payments (approximately $0.10 USDC on Base) without requiring manual intervention from the user. Users would leverage this skill primarily for enhanced privacy and security, avoiding the need to disclose their personal phone number when signing up for new online services or creating secondary accounts. It's particularly useful for situations requiring a one-time verification or when a user wishes to protect their primary communication lines from potential spam or data breaches. The skill streamlines the often cumbersome process of acquiring temporary numbers, making it a frictionless experience for agents. By handling the crypto payment and API interactions, `shadow-number` significantly reduces the complexity for an AI agent to perform phone-verified sign-ups. This makes it an invaluable tool for tasks requiring numerous sign-ups, privacy-conscious operations, or for developers and testers needing temporary numbers for automated testing environments.
Best use case
The primary use case for `shadow-number` is to enable AI agents to sign up for online services and platforms that require phone number verification, all while protecting the user's real phone number. Individuals seeking to maintain their privacy, avoid spam, or create secondary accounts without disclosing personal information will benefit most. It's also highly useful for developers needing to test sign-up flows or for agents managing multiple social media or service accounts.
Get a disposable temp phone number and receive OTP codes to sign up on websites without using your real number. Handles x402 crypto payment automatically.
The user should expect a successful completion of an online service sign-up or phone verification process using a temporary, disposable phone number.
Practical example
Example input
Sign me up for Google using a temporary US phone number. Make sure to input the OTP automatically.
Example output
Successfully created an account on Google using temporary number +1 (XXX) XXX-XXXX. Verification complete.
When to use this skill
- When signing up for a new online service anonymously.
- When a website requires SMS/OTP verification and you don't want to use your personal number.
- For testing sign-up flows that include phone verification.
- To manage multiple accounts that require unique phone numbers.
When not to use this skill
- For services requiring a long-term, persistent phone number.
- When you need to make calls or send SMS messages from the number.
- For critical services where account recovery relies on this specific number.
- For any illicit or unethical activities.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/shadow-phone/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How shadow-number Compares
| Feature / Agent | shadow-number | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | easy | N/A |
Frequently Asked Questions
What does this skill do?
Get a disposable temp phone number and receive OTP codes to sign up on websites without using your real number. Handles x402 crypto payment automatically.
How difficult is it to install?
The installation complexity is rated as easy. You can find the installation instructions above.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
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SKILL.md Source
SHADOW_API_URL=https://extraordinary-charisma-production.up.railway.app
# Shadow Number Skill
Use this skill when you need to sign up on a website that requires phone verification, or any time you need a disposable phone number to receive an OTP/SMS verification code.
## What This Skill Does
1. Calls the Shadow API (x402-gated — payment ~$0.10 USDC on Base is handled automatically)
2. Returns a real temporary phone number for the chosen service and country
3. Navigates to the target website and enters the number into the signup form
4. Polls the Shadow OTP endpoint every 15 seconds until the SMS code arrives
5. Enters the OTP to complete verification
---
## Step 1: Choose Service Code
Pick the service code for the website you are signing up on:
| Website | Code |
|---|---|
| Telegram | opt1 |
| Facebook | opt2 |
| Google / Gmail | opt7 |
| WhatsApp | opt29 |
| Instagram | opt36 |
| Twitter / X | opt48 |
| Microsoft | opt33 |
| Apple | opt42 |
| PayPal | opt15 |
| Amazon | opt22 |
| Tinder | opt38 |
| Shopee | opt49 |
If the exact service is not listed above, use the service name to search — the API accepts any valid SMSPVA service code.
---
## Step 2: Buy a Temp Number (x402 payment)
Make a POST request to the Shadow buy endpoint. This endpoint requires x402 payment — your agent wallet will automatically pay ~$0.10 USDC on Base when the server returns HTTP 402, then retry.
```
POST https://extraordinary-charisma-production.up.railway.app/api/smspva/buy
Content-Type: application/json
{
"country": "US",
"service": "opt7"
}
```
Supported country codes: US, GB, FR, DE, IN, BR, PH, ID, NG, RU, UA, PL, CA, AU, MX, and 60+ more.
**Success response (200):**
```json
{
"statusCode": 200,
"data": {
"phoneNumber": "14155552671",
"orderId": "abc123",
"orderExpireIn": 600
}
}
```
The full number to enter on the website is: `+{countryCode}{phoneNumber}` (e.g. `+14155552671` for US numbers).
If you get a non-200 response, try a different country or service code and call buy again.
---
## Step 3: Use the Number on the Website
Use your browser to:
1. Navigate to the website's signup or phone verification page
2. Enter the phone number in international format (e.g. `+14155552671`)
3. Click the "Send code" / "Verify" / "Get OTP" button
4. Wait for the page to confirm the SMS was sent
---
## Step 4: Poll for OTP
After triggering the SMS, poll every 15 seconds:
```
GET https://extraordinary-charisma-production.up.railway.app/api/smspva/otp/{orderId}
```
**OTP received (200):**
```json
{
"statusCode": 200,
"data": {
"sms": { "code": "123456" },
"orderId": "abc123",
"orderExpireIn": 540
}
}
```
Extract `data.sms.code` — that is your OTP.
**Not yet received (202):** wait 15 seconds and retry.
Stop polling if:
- You receive status 200 (success)
- `orderExpireIn` drops to 0 (order expired — start over)
- You receive status 410 (order closed)
---
## Step 5: Enter the OTP
Go back to the browser tab and enter the OTP code from `data.sms.code` into the verification field. Submit the form to complete signup.
---
## Error Recovery
**Number doesn't work / site rejects it:**
```
PUT https://extraordinary-charisma-production.up.railway.app/api/smspva/refuse/{orderId}
```
Then go back to Step 2 and buy a new number.
**Number is banned by the service:**
```
PUT https://extraordinary-charisma-production.up.railway.app/api/smspva/ban/{orderId}
```
Then buy a new number with a different country.
---
## Full Example Flow
> User: "Sign me up on Telegram with a US number"
1. Call `POST /api/smspva/buy` with `{ country: "US", service: "opt1" }`
2. Get back `phoneNumber: "14155552671"`, `orderId: "x9k2m"`
3. Open browser → navigate to `https://web.telegram.org` → start signup
4. Enter `+14155552671` as the phone number → click Send Code
5. Poll `GET /api/smspva/otp/x9k2m` every 15s
6. Receive `{ sms: { code: "84712" } }`
7. Enter `84712` in the Telegram verification box → account created ✅
---
## Notes
- Numbers are single-use and expire after `orderExpireIn` seconds (typically 5–10 minutes)
- Always use international format with `+` prefix when entering the number on websites
- Some services block certain countries — if one country fails, retry with a different one
- The x402 payment (~$0.10 USDC) is charged per number purchase, not per OTP pollRelated Skills
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