Use asms with opencode

Add asms to opencode. Your agent can then get verification codes, rent numbers and read their SMS from the terminal.

Set it up Get an API key

opencode

> 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 opencode

Once asms is connected, opencode 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

The quick way: paste a prompt

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

prompt

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

Or step by step

Add asms to opencode.json

With this entry opencode reads your key from the environment.

opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "asms": {
      "type": "remote",
      "url": "https://asms.ai/mcp",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer {env:ASMS_API_KEY}"
      }
    }
  }
}

2
Or sign in with asms
Leave out headers and run the login command.
sign in
```
opencode mcp auth asms
```
3
Check it
should list asms
```
opencode mcp list
```

For AI agents reading this page

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

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 opencode prompts for it, or create a key at https://asms.ai/dashboard#api-keys and set ASMS_API_KEY.
Register the server: add an "asms" entry under "mcp" in opencode.json: type "remote", url https://asms.ai/mcp, enabled true, headers { "Authorization": "Bearer {env:ASMS_API_KEY}" }.
Check it worked: run `opencode mcp list` (or `opencode mcp debug asms`) and confirm it connects.
Start read-only: call get_balance, then get_pricing or get_rental_offers, and report what you found.
Before any tool that spends from the wallet (create_otp_order, rent_number), tell the user the price and wait for their OK.
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 endpoint	https://asms.ai/mcp
Transport	Streamable HTTP (stateless)
Auth	OAuth sign-in with asms, or the header Authorization: Bearer <ASMS_API_KEY>
REST API	https://asms.ai/api-docs
For LLMs	https://asms.ai/llms.txt

Tools

Tool	What it does	Needs your OK?
`get_balance`	Wallet balance	No
`get_pricing`	Verification code prices	No
`get_inventory`	Verification number stock	No
`create_otp_order`	Order a verification number	Yes
`poll_sms`	Check for the verification code	No
`list_active_orders`	List verification orders	No
`cancel_order`	Cancel a verification order	Yes
`get_rental_offers`	Number rental prices	No
`rent_number`	Rent a phone number	Yes
`list_rentals`	List rented numbers	No
`read_rental_sms`	Read a rented number's SMS	No
`cancel_rental`	Cancel a rental for a refund	Yes

Other agents and tools

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

Questions

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 opencode 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 opencode 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