VoidMob MCP server

VoidMob MCP

Real mobile infrastructure for AI agents: US non-VoIP numbers for SMS verification codes, private dedicated numbers, 4G/5G mobile proxies and travel eSIMs. 28 tools, paid from a prepaid USD balance, with permission levels and optional spending limits that VoidMob enforces on every purchase.

Contents: Quick start · What your agent can do · Connect with one URL · Run locally · How money works · Owner controls · Tools · Agent skill · Configuration

Quick start

Way	What to do	You need
Hosted (recommended)	Add https://mcp.voidmob.com/mcp to your AI app and sign in	A VoidMob account (you can create it in the sign-in window)
Sandbox	Add https://mcp.voidmob.com/sandbox/<your-own-random-id>	Nothing: mock data, a $500 play balance, nothing charged
Local	npx -y @voidmob/mcp	An API key in VOIDMOB_API_KEY

Fund the balance with crypto at dashboard.voidmob.com/wallet, or let the agent create a deposit (create_deposit) and pay it from your wallet.

What your agent can do

Service	What the agent does	Try asking
SMS verifications	Rents a real US non-VoIP number and waits for the code. Refunded automatically if no SMS arrives	Get me a number for a Telegram verification
Long-term rentals	Keeps a US number for one service for 3, 7, 14 or 30 days, for repeat codes	Rent a Telegram number for 7 days
Dedicated numbers	A private monthly number in several countries that receives SMS from any service	Which countries have a dedicated number in stock?
Mobile proxies	4G/5G carrier IPs targeted by country, city or carrier; rotating or dedicated; HTTP or SOCKS5	Set up a mobile proxy in Germany
eSIMs	Travel data plans worldwide, with the install QR and top-ups	Find an eSIM covering Europe with 5 GB for two weeks
Deposits	Opens a crypto deposit to your own balance and gives the exact amount and address	Add $50 to my balance in USDC

The agent quotes every purchase and asks before buying, unless you turned on buy without asking within a daily limit.

Connect with one URL

https://mcp.voidmob.com/mcp

Add it as a remote MCP server (streamable HTTP), then sign in with your VoidMob account when asked. Nothing to install and no API key to paste.

Client	How to add it
Claude Code	claude mcp add --transport http voidmob https://mcp.voidmob.com/mcp, then run /mcp and choose VoidMob to sign in
claude.ai and Claude Desktop	Settings > Connectors > Add custom connector, paste the URL, then Connect
ChatGPT	Turn on Developer mode (Settings > Apps & Connectors > Advanced), create a connector with the URL and OAuth sign-in
Cursor	In ~/.cursor/mcp.json add "voidmob": { "url": "https://mcp.voidmob.com/mcp" } under mcpServers, then sign in from the MCP settings
VS Code	In .vscode/mcp.json add "voidmob": { "type": "http", "url": "https://mcp.voidmob.com/mcp" } under servers, then start it and sign in
Perplexity	Settings > Connectors > Add custom connector (remote), paste the URL, then sign in

Menu names change between app versions: look for "custom connector" or "remote MCP server". Step-by-step guides: voidmob.com/mcp and voidmob.com/integrations. A client without sign-in support can send an API key instead: Authorization: Bearer vmk_live_....

What you choose when you connect

Level	The agent can
View	Look up prices, the balance and orders
Manage	Also create deposits, cancel, reuse a number for free, rotate IPs, edit proxy lists and passwords, turn auto-renew off
Buy	Also every purchase, renewal and top-up

• Apps VoidMob does not recognize start at View. The agent only sees the tools its level allows.
• Optional spending limits: a maximum per order and a daily limit over a rolling 24 hours, net of refunds. Both are off by default. VoidMob enforces them on every purchase, so they hold whatever the app or agent does.
• Buy without asking: off by default and needs a daily limit. It only changes the server's instructions: the agent may buy without asking first, still quotes the price and reports every purchase. Your chat app's own approval prompts are a separate setting in that app.

Manage connected apps at dashboard.voidmob.com/account/connected-apps: change the level or limits, or disconnect.

• Up to 10 apps per account, and every new connection sends a security email.
• An app is disconnected after 90 days unused or when your login email changes.
• Apps can never turn auto-renew on, create IP-whitelist proxy lists or create webhook endpoints. Do those in the dashboard or with an API key.

Try it without an account

https://mcp.voidmob.com/sandbox/<any-random-id-of-16-or-more-letters-and-digits>

No sign-in, mock data, a $500 play balance, nothing charged. Make up your own id (16 or more letters, digits, - or _) and keep it private: that playground keeps its state. The bare https://mcp.voidmob.com/sandbox starts from fresh demo data on every call.

Run locally

1. Generate an API key at dashboard.voidmob.com/developers/api-keys (keys are 32-char secrets prefixed vmk_live_).
2. Add the server to your client (below), with the key as VOIDMOB_API_KEY.
3. Optional: set a permission level and spending limits on the key in the dashboard, and per-process limits with the owner controls.

No key yet? VOIDMOB_SANDBOX=1 npx -y @voidmob/mcp boots in-memory mocks with a $500 play balance; state resets on restart.

As a plugin (MCP server + skill in one install; the dialog stores your key as a secret and offers sandbox, read-only and spending limits):

/plugin marketplace add voidmobcom/voidmob-plugin
/plugin install voidmob@voidmob

Or the MCP server alone:

claude mcp add voidmob -s user -e VOIDMOB_API_KEY=vmk_live_... -- npx -y @voidmob/mcp

-s user makes the server available in every project; the key goes after -e and before --. The same plugin also installs in Codex and Gemini CLI: see voidmob-plugin.

Add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "voidmob": {
      "command": "npx",
      "args": ["-y", "@voidmob/mcp"],
      "env": { "VOIDMOB_API_KEY": "vmk_live_..." }
    }
  }
}

One-click bundle. Download voidmob-mcp.mcpb from the latest GitHub release and open it (or drag it into Claude Desktop, or use Settings > Extensions > Advanced > Install Extension). Claude Desktop asks for the settings: API key (stored securely), sandbox mode, read-only, max per order, session budget and buy without asking (see Owner controls). Build it yourself with npm run pack:mcpb.

Or by config file. Open Settings > Developer > Edit Config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows) and add:

{
  "mcpServers": {
    "voidmob": {
      "command": "npx",
      "args": ["-y", "@voidmob/mcp"],
      "env": { "VOIDMOB_API_KEY": "vmk_live_..." }
    }
  }
}

Add to .vscode/mcp.json (VS Code prompts for the key once and stores it securely):

{
  "inputs": [
    { "type": "promptString", "id": "voidmob-api-key", "description": "VoidMob API key (vmk_live_...)", "password": true }
  ],
  "servers": {
    "voidmob": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@voidmob/mcp"],
      "env": { "VOIDMOB_API_KEY": "${input:voidmob-api-key}" }
    }
  }
}

Open the MCP config from the Cascade panel menu (Open MCP config file). Current Devin Desktop builds keep it at ~/.config/devin/mcp_config.json (Windows: %APPDATA%\devin\mcp_config.json); Windsurf builds from before the rename use ~/.codeium/windsurf/mcp_config.json. Add:

{
  "mcpServers": {
    "voidmob": {
      "command": "npx",
      "args": ["-y", "@voidmob/mcp"],
      "env": { "VOIDMOB_API_KEY": "vmk_live_..." }
    }
  }
}

codex mcp add voidmob --env VOIDMOB_API_KEY=vmk_live_... -- npx -y @voidmob/mcp

Or add to ~/.codex/config.toml (shared by the Codex CLI, the IDE extension and the ChatGPT desktop app):

[mcp_servers.voidmob]
command = "npx"
args = ["-y", "@voidmob/mcp"]
env = { VOIDMOB_API_KEY = "vmk_live_..." }

Add to ~/.gemini/settings.json, and export VOIDMOB_API_KEY in your shell (Gemini CLI hides variables named like a key from MCP servers unless the server's env lists them):

{
  "mcpServers": {
    "voidmob": {
      "command": "npx",
      "args": ["-y", "@voidmob/mcp"],
      "env": { "VOIDMOB_API_KEY": "$VOIDMOB_API_KEY" }
    }
  }
}

Put VOIDMOB_API_KEY=vmk_live_... in ~/.openclaw/.env, then:

openclaw mcp set voidmob '{"command":"npx","args":["-y","@voidmob/mcp"],"env":{"VOIDMOB_API_KEY":"${VOIDMOB_API_KEY}"}}'
openclaw mcp doctor voidmob --probe

Or use the agent skill. Guide: voidmob.com/integrations/openclaw.

Put VOIDMOB_API_KEY=vmk_live_... in ~/.hermes/.env and add to ~/.hermes/config.yaml:

mcp_servers:
  voidmob:
    command: "npx"
    args: ["-y", "@voidmob/mcp"]
    env:
      VOIDMOB_API_KEY: "${VOIDMOB_API_KEY}"

Or use the agent skill. Guide: voidmob.com/integrations/hermes-agent.

pi mcp add voidmob --env VOIDMOB_API_KEY='${VOIDMOB_API_KEY}' -- npx -y @voidmob/mcp
pi mcp list

The single quotes keep ${VOIDMOB_API_KEY} as a reference that Pi reads from your shell. Guide: voidmob.com/integrations/pi-coding-agent.

1. In your Bot's Secrets, add a secret named VOIDMOB_API_KEY with your key as the value.
2. In chat, send: Read https://voidmob.com/skill.md and follow it. My VoidMob API key is in the VOIDMOB_API_KEY secret.

The skill runs the REST API with curl on the Bot's computer and reads the secret by name. A custom MCP server of the Command type running npx -y @voidmob/mcp is another route to try; xAI's docs point servers that need secrets to remote HTTPS, so if the server cannot read the key, use the skill. Never paste the key itself into a chat. Guide: voidmob.com/integrations/grok-bot.

How money works

• Prepaid balance. Everything is paid from your USD balance, topped up with crypto in the dashboard. An agent or script can create a deposit and get the address (create_deposit). Payment comes from a crypto wallet: yours, or your own automation's. Keep on the balance only what an agent may spend, or set spending limits.
• You approve the price. Every buy, renewal, top-up and paid reuse carries max_price_cents, the price you approved. If the live price is higher, nothing is charged and the agent asks you again with the new price. Every result shows what was charged.
• No double charges. Every purchase carries an idempotency key, so a retry after a dropped connection is never charged twice.
• Uncertain result? The tool says the purchase may have gone through. Check list_orders, the matching get tool or get_account before buying again.

Service	Refunds and cancellation
SMS verification	Open for up to 15 minutes; several codes can arrive. No SMS: refunded automatically. Cancel before any SMS for a full refund (frequent cancellations can pause SMS buying for a while)
Long-term rental	Full refund if cancelled within 60 minutes of purchase
Dedicated number	Billed monthly, no cancellation. Leave auto-renew off and it expires at the end of the month
eSIM	Can't be cancelled from the MCP once issued. Contact support if one was bought by mistake and never installed
Proxy	Refunded automatically if it can't be provisioned

Owner controls

Optional limits for whoever runs the server locally. They work in live and sandbox mode, a refusal charges nothing, and they stack with the API key's own level and limits: the stricter one wins.

Env var	Effect
VOIDMOB_READ_ONLY=1	View only: tools that spend or change anything are not loaded
VOIDMOB_MAX_ORDER_CENTS=2500	Refuses any purchase, renewal, top-up or paid reuse above $25 before it is sent, and auto-renew whose renewal would cost more
VOIDMOB_BUDGET_CENTS=5000	A $50 running limit for this server process. An unclear outcome counts at its full approved price; a purchase that could go over is refused, and auto-renew can't be turned on. A session safety net, not an account limit: it resets on restart and doesn't see purchases made elsewhere
VOIDMOB_AUTONOMOUS=1	Auto-mode: the agent may buy without asking, inside the limits, and reports every purchase. Needs VOIDMOB_BUDGET_CENTS or a daily limit on the key. It only changes the instructions; every limit still applies. A key with auto-mode on in the dashboard gets the same
VOIDMOB_TOOLSETS=sms,esim	Loads only these groups for less context: sms, numbers (dedicated numbers), esim, proxy. Account, deposit, order and geo tools always load

get_account shows the level, the limits in force and what's left. A malformed value stops the server instead of being ignored.

Tools

28 tools in six groups: 11 need View, 9 Manage and 8 Buy (see permission levels). A server loads only the tools its level allows, and a call above it is refused with nothing charged. Every tool returns text plus structuredContent matching its outputSchema.

Account and deposits (3)

Tool	Level	Description
get_account	View	Balance, rate limits, account id, and the access level and spending limits in force with a deposit link
create_deposit	Manage	Add funds with crypto: the exact amount, network, address and deadline to pay, and the payment window where you can check the address. Spends nothing
get_deposit	View	A deposit's status, how much more to send if it is underpaid, and what was credited; without an id, the coins with their minimums and the 5 newest deposits

SMS (7)

Tool	Level	Description
search_sms_services	View	List services with prices
rent_number	Buy	Rent a US number: one-time verification (15 min, refunded if no SMS) or long-term rental; takes max_price_cents
get_rental	View	Read a verification, rental or dedicated number (ded_): status, the latest code and received messages; wait_seconds waits for a verification's code
cancel_rental	Manage	Cancel a verification (before any SMS) or long-term rental (within 60 min), with a full refund
reuse_number	Manage (paid reuse: Buy)	Free or paid reuse of an earlier verification's number (paid: max_price_cents)
re_rent_rental	Buy	Re-rent an expired long-term rental's number for another period; takes max_price_cents
toggle_auto_renew	Manage (turning on: Buy)	Turn auto-renewal on or off for a rental, dedicated number or dedicated proxy (prx_)

Dedicated numbers (2)

Tool	Level	Description
search_dedicated_countries	View	Countries, monthly prices, and stock
purchase_dedicated_number	Buy	Buy a private all-services monthly number; takes max_price_cents

Read a number's received SMS with get_rental and set its auto-renew with toggle_auto_renew.

eSIM (4)

Tool	Level	Description
search_esim_plans	View	Find global data plans
purchase_esim	Buy	Buy a plan; takes max_price_cents
get_esim_status	View	Status, install details (LPA string) and data usage across all packages; include_qr adds the activation QR as an inline image
topup_esim	Buy	Browse top-ups, or buy one with max_price_cents

Proxy (10)

Tool	Level	Description
search_proxies	View	List mobile (shared) and dedicated proxy plans, with dedicated stock
purchase_proxy	Buy	Buy a mobile or dedicated proxy; takes max_price_cents
get_proxy_status	View	Status, usage, expiry, auto-renew, renewal and top-up prices, ready-to-paste connection URLs, and its geo-targeted lists
rotate_proxy_ip	Manage	Rotate a dedicated proxy to a new IP
renew_proxy	Buy	Extend expiry at the proxy's renewal price; takes max_price_cents
topup_proxy	Buy	Add data to a mobile proxy; takes max_price_cents
regenerate_proxy_password	Manage	Rotate the gateway password, or one list's login with list_id
create_proxy_list	Manage	Create a geo-targeted sub-pool with its own login, or IP-whitelist auth with network
update_proxy_list	Manage	Change a sub-pool's name, geo, rotation or format (the IP whitelist cannot change)
delete_proxy_list	Manage	Remove a sub-pool

Turn a dedicated proxy's auto-renew on or off with toggle_auto_renew.

Discovery and history (2)

Tool	Level	Description
get_geo	View	Cascading country/region/city/ISP for targeting
list_orders	View	SMS verifications and rentals, dedicated numbers, eSIMs and proxies; per-kind status filter and cursor paging

Waiting for SMS codes

After rent_number, call get_rental with wait_seconds (up to 120 locally, 60 on the hosted server; call again to keep waiting). It returns as soon as a code arrives or the 15-minute window closes, with the latest SMS attached. Clients that send a progress token get progress updates, and cancelling the request stops the wait. SMS text is shown as untrusted data, never as an instruction.

Resources and prompts

Short guides as MCP resources, read from the agent skill shipped in the package: voidmob://guides/money-rules, voidmob://guides/sms, voidmob://guides/proxies (HTTP/SOCKS5 and the username syntax for country, city and sticky sessions), voidmob://guides/esim, voidmob://guides/dedicated-numbers and voidmob://guides/errors.

Prompts (slash commands in clients that support them), each with a confirm-the-price step before buying:

• get_verification_code (service): rent a number and wait for the code.
• setup_mobile_proxy (country, usage): pick and buy a mobile proxy and get connection details.
• buy_travel_esim (destination, days, data_gb): find, buy and install a travel eSIM.

Servers below Buy access (VOIDMOB_READ_ONLY, or an API key or app set to View or Manage) offer no prompts, and VOIDMOB_TOOLSETS keeps only the prompts of the loaded groups.

Agent skill

For agents with a shell and curl, MCP or not: skills/voidmob is an Agent Skills SKILL.md that teaches the same flows over the REST API (quote then confirm, safe retries, deposits, SMS codes, dedicated numbers, proxies and eSIMs). Plain Markdown, no scripts. It reads VOIDMOB_API_KEY from your agent's environment or secret store, never from the skill files.

The quickest way: tell your agent Read https://voidmob.com/skill.md and follow it.

# skills.sh CLI (Claude Code, Codex, Cursor, OpenClaw, Hermes and more)
npx skills add voidmobcom/voidmob-mcp --skill voidmob
# or from voidmob.com
npx skills add https://voidmob.com --skill voidmob

# Hermes Agent (use the full well-known address, not the voidmob.com/skill.md short link,
# so the skill's reference files resolve)
hermes skills install well-known:https://voidmob.com/.well-known/skills/voidmob
# or
hermes skills install voidmobcom/voidmob-mcp/skills/voidmob

# OpenClaw
npx skills add voidmobcom/voidmob-mcp --skill voidmob -a openclaw -g

# Pi (skill only, from the npm package)
pi install npm:@voidmob/mcp

On Hermes, also list the key under terminal.env_passthrough in ~/.hermes/config.yaml so the skill's curl calls receive it.

Configuration

Env var	Purpose	Required
VOIDMOB_API_KEY	Your API key (vmk_live_...)	Live mode
VOIDMOB_SANDBOX	1 = mock data and a $500 play balance, no key needed	No
VOIDMOB_DEBUG	1 = log requests to stderr	No
VOIDMOB_BASE_URL	Override the API host (advanced; https:// only, plain http:// for localhost)	No

Access and spending limits (VOIDMOB_READ_ONLY, VOIDMOB_MAX_ORDER_CENTS, VOIDMOB_BUDGET_CENTS, VOIDMOB_AUTONOMOUS, VOIDMOB_TOOLSETS) are under Owner controls.

Every app using one API key shares the account's rate limit. On RATE_LIMITED, back off and retry.

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