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MCP for AI agents

Use asms with Codex

Add asms to Codex with one command. Codex can then get verification codes, rent numbers and read their SMS from your terminal, IDE or the Codex app.

Set it up Get an API key
Sign in or API key Codes from $0.50, refunded if none arrives Asks before it spends
Codex

> Get me a US number for Telegram and give me the code when it arrives.

● asms.get_pricing({ "country": "us", "service": "telegram" }) → in stock

US Telegram numbers are in stock at the listed price, and you're only charged if a code arrives. Order one?

> Yes, go ahead.

● asms.create_otp_order({ "country": "us", "service": "telegram" }) → +1 347 •••-••18

● asms.poll_sms({ "orderId": "…" }) → code received

Your number is +1 347 •••-••18 and the Telegram code is 504913.

What you can ask Codex

Once asms is connected, Codex can order numbers, read the SMS they receive and check your account, all paid from your asms wallet.

Get a verification code

“Order a UK number for WhatsApp and wait for the code.”

Rent a number you keep

“Rent a US number for a month for our app's SMS login tests, and show me any texts it gets.”

Check the account

“What's my asms balance, and which orders are still waiting for a code?”

Setup

Sign in with your asms account, or use an API key from your dashboard. Either way Codex uses your asms wallet.

The quick way: paste a prompt

Paste this into Codex. It reads this page and follows the steps for agents below.

prompt
Connect the asms MCP server to Codex by following the steps for AI agents at https://asms.ai/agents/codex. My asms API key is in the ASMS_API_KEY environment variable; don't print it.

Or step by step

  1. 1

    Add the server with your API key

    Keep your key in ASMS_API_KEY; Codex reads it from the environment and never stores it.

    API key
    codex mcp add asms --url https://asms.ai/mcp --bearer-token-env-var ASMS_API_KEY
  2. 2

    Or sign in with asms

    sign in
    codex mcp add asms --url https://asms.ai/mcp
codex mcp login asms
  3. 3

    Check it

    Or type /mcp in Codex. The CLI, the IDE extension and the Codex app share this setup (~/.codex/config.toml).

    should list asms
    codex mcp list

For AI agents reading this page

If a user asked you to connect asms to Codex, follow these steps in order.

  1. Check whether the ASMS_API_KEY environment variable is set, without printing its value. If it is not set, the user can either sign in with asms when Codex prompts for it, or create a key at https://asms.ai/dashboard#api-keys and set ASMS_API_KEY.
  2. Register the server: run `codex mcp add asms --url https://asms.ai/mcp --bearer-token-env-var ASMS_API_KEY` (or without the flag, then `codex mcp login asms` for the user to sign in).
  3. Check it worked: run `codex mcp list` and confirm asms is listed and enabled.
  4. Ask the user to start a new Codex session (`codex resume --last` keeps the conversation) so the tools load.
  5. Start read-only: call get_balance, then get_pricing or get_rental_offers, and report what you found.
  6. Before any tool that spends from the wallet (create_otp_order, rent_number), tell the user the price and wait for their OK.
  7. Never create an asms account or API key, top up the wallet, or approve a sign-in on the user's behalf, and never print the key.

Reference

MCP endpointhttps://asms.ai/mcp
TransportStreamable HTTP (stateless)
AuthOAuth sign-in with asms, or the header Authorization: Bearer <ASMS_API_KEY>
REST APIhttps://asms.ai/api-docs
For LLMshttps://asms.ai/llms.txt

Tools

ToolWhat it doesNeeds your OK?
get_balanceWallet balanceNo
get_pricingVerification code pricesNo
get_inventoryVerification number stockNo
create_otp_orderOrder a verification numberYes
poll_smsCheck for the verification codeNo
list_active_ordersList verification ordersNo
cancel_orderCancel a verification orderYes
get_rental_offersNumber rental pricesNo
rent_numberRent a phone numberYes
list_rentalsList rented numbersNo
read_rental_smsRead a rented number's SMSNo
cancel_rentalCancel a rental for a refundYes

Other agents and tools

Claude Code Claude ChatGPT Cursor VS Code Windsurf Gemini CLI opencode Grok OpenAI API any MCP client

Questions

What does the config look like?+

codex mcp add writes this to ~/.codex/config.toml: [mcp_servers.asms] url = "https://asms.ai/mcp" and bearer_token_env_var = "ASMS_API_KEY". You can also add it there by hand.

What does it cost?+

Connecting is free. You pay from your asms wallet: verification codes from $0.50, charged only when a code arrives and refunded automatically when none does, and rented numbers priced by country and period. Top up by card, PayPal or crypto.

Will Codex spend money without asking?+

Ordering a code and renting a number are marked as spending tools, so clients that support it ask for your approval first, and asms tells the agent to confirm the price with you before buying. Reading prices, balances and messages never spends anything.

What's the difference between a code and a rented number?+

A verification code order gives you a number for one code, for one service, and refunds itself if nothing arrives. A rented number is yours for a set period, from a day to a year, and receives every SMS sent to it: useful for testing your own app's SMS login or for an account you'll need to verify again later.

How do I disconnect it?+

Delete the API key in your asms dashboard, or remove asms under Connected apps if you signed in. Either one cuts off access straight away.

Give Codex a phone number

Create an account, top up from a few dollars, and connect. Codes from $0.50, refunded automatically when none arrives.

Create your account All agents