README.md
Provision dedicated real-SIM US phone numbers and receive SMS/OTP codes
@joltsms/mcp-server
MCP server for JoltSMS — provision dedicated real-SIM US phone numbers and receive SMS/OTP codes through AI agents.
Built on the Model Context Protocol, this server gives AI agents (Claude Code, Claude Desktop, Cursor, etc.) the ability to rent phone numbers, wait for incoming SMS, extract OTP codes, and manage billing — all through standardized tool calls.
Quick Start
1. Get an API Key
Create a JoltSMS account and generate an API key at Dashboard → Settings → API Keys.
2. Configure Your MCP Client
Add to your .mcp.json (Claude Code) or MCP settings (Claude Desktop, Cursor):
{
"mcpServers": {
"joltsms": {
"command": "npx",
"args": ["-y", "@joltsms/mcp-server"],
"env": {
"JOLTSMS_API_KEY": "jolt_sk_your_key_here"
}
}
}
}
3. Use It
Your AI agent now has access to all JoltSMS tools. Try:
"Provision a new phone number with area code 650 and wait for an OTP"
Tools
| Tool | Description |
|---|---|
joltsms_list_numbers |
List active numbers with service labels, tags, and unread counts |
joltsms_get_number |
Full details for a single number |
joltsms_update_number |
Set service label, tags, or notes on a number |
joltsms_provision_number |
Rent a new dedicated real-SIM US number ($50/mo) |
joltsms_release_number |
Cancel/release a number at end of billing period |
joltsms_list_messages |
List recent SMS with parsed OTP codes |
joltsms_mark_read |
Mark single or bulk messages as read |
joltsms_wait_for_sms |
Poll until an SMS arrives (key tool for OTP flows) |
joltsms_get_latest_otp |
Get the most recent parsed verification code |
joltsms_billing_status |
Check all subscriptions with billing health |
OTP Verification Workflow
The most common use case — automated phone verification:
1. joltsms_provision_number({ area_code: "650" })
→ Number provisioning started! Phone: +16505551234
2. joltsms_update_number({ number_id: "+16505551234", service_name: "PayPal" })
→ Tagged for easy lookup later
3. [Agent enters phone number on PayPal and requests OTP]
4. joltsms_wait_for_sms({ number_id: "+16505551234", timeout_seconds: 120 })
→ SMS received after 8.2s: "Your PayPal code is 847291"
→ OTP Code: 847291
5. joltsms_mark_read({ number_id: "+16505551234" })
→ Inbox clean
6. [Agent enters 847291 on PayPal — verification complete]
Environment Variables
| Variable | Required | Description |
|---|---|---|
JOLTSMS_API_KEY |
Yes | Your API key (jolt_sk_*) |
JOLTSMS_API_URL |
No | API base URL (defaults to https://api.joltsms.com) |
Requirements
- Node.js 18+
- A JoltSMS account with a payment method on file
- Your first number must be ordered through the Dashboard to complete initial 3D Secure verification
Documentation
License
MIT
Tools (10)
joltsms_list_numbersList active numbers with service labels, tags, and unread countsjoltsms_get_numberFull details for a single numberjoltsms_update_numberSet service label, tags, or notes on a numberjoltsms_provision_numberRent a new dedicated real-SIM US numberjoltsms_release_numberCancel/release a number at end of billing periodjoltsms_list_messagesList recent SMS with parsed OTP codesjoltsms_mark_readMark single or bulk messages as readjoltsms_wait_for_smsPoll until an SMS arrivesjoltsms_get_latest_otpGet the most recent parsed verification codejoltsms_billing_statusCheck all subscriptions with billing healthEnvironment Variables
JOLTSMS_API_KEYrequiredYour API key (jolt_sk_*)JOLTSMS_API_URLAPI base URL (defaults to https://api.joltsms.com)Configuration
claude_desktop_config.json
{"mcpServers": {"joltsms": {"command": "npx", "args": ["-y", "@joltsms/mcp-server"], "env": {"JOLTSMS_API_KEY": "jolt_sk_your_key_here"}}}}Try it
→Provision a new phone number with area code 650 and wait for an OTP.
→List all my active phone numbers and check if there are any unread messages for my PayPal account.
→Get the latest OTP code for the phone number ending in 1234.
→Update the service label for my phone number +16505551234 to 'GitHub' and mark all messages as read.