Summary
Connects Claude to JoltSMS for provisioning real SIM US phone numbers and handling SMS verification flows. Exposes tools to rent numbers by area code ($50/month), poll for incoming messages, extract OTP codes, and manage billing subscriptions. The core workflow is automated verification: provision a number, tag it with a service name like "PayPal", wait for SMS using `joltsms_wait_for_sms` with configurable timeout, grab the parsed OTP code, then mark messages read. Useful when you need agents to complete phone verification steps autonomously without manual SMS forwarding. First number must be ordered through the dashboard for payment verification, then the MCP handles everything programmatically.
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one prompt install →@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
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Plug Mailtrap into your AI workflow and let it handle the email.
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Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Configuration
JOLTSMS_API_KEY*secretYour JoltSMS API key (jolt_sk_*). Create one at https://app.joltsms.com/settings
Registryactive
Package@joltsms/mcp-server
TransportSTDIO
AuthRequired
UpdatedFeb 25, 2026
