What is Surge

Surge is an SMS and voice API that handles carrier registration for you. If you've used Twilio, Sinch, or Vonage, you know the pain: weeks of waiting for carrier approval, XML-based voice configuration, and support tickets that go nowhere. Surge gives you a demo number to test with immediately, and production registration takes hours instead of weeks.

Why Surge?

• 24-to-48-hour carrier registration with a guaranteed 72-hour response. Twilio and Sinch typically take two to four weeks.
• JSON everywhere. REST API, voice call configuration, webhooks. No XML, no TwiML, no legacy protocols.
• One-click voice agent integrations with ElevenLabs, Retell, and Vapi.
• Embeddable UI components you drop into your app: inbox, conversation, dialpad, unread count.
• SDKs for Python, TypeScript, Ruby, and Elixir with full API parity.
• Responsive support when registrations get flagged or carriers block messages.

Who Surge is for

Developers adding messaging to a product. Appointment reminders, order notifications, 2FA, conversational SMS agents. Surge handles TCR paperwork and carrier registration so you don't build compliance infrastructure.

Vertical SaaS platforms. Create one Account per customer, register each brand separately, and keep compliance, billing, and message history isolated. See One Account per Customer for the full pattern.

What you can build

Try it now

Send a test message with a single API call. No registration or phone number purchase required:

from surge import Surge

surge = Surge()  # reads SURGE_API_KEY from environment

message = surge.messages.create(
    account_id="{account_id}",
    to="+18015551234",
    body="Hello from Surge!",
)

print(message.id)

import Surge from "@surgeapi/node";

const surge = new Surge(); // reads SURGE_API_KEY from environment

const message = await surge.messages.create("{account_id}", {
  to: "+18015551234",
  body: "Hello from Surge!",
});

console.log(message.id);

require "surge_api"

surge = SurgeAPI::Client.new # reads SURGE_API_KEY from environment

message = surge.messages.create(
  "{account_id}",
  to: "+18015551234",
  body: "Hello from Surge!"
)

puts message.id

client = Surge.Client.new(System.get_env("SURGE_API_KEY"))

{:ok, message} =
  Surge.Messages.create(
    client,
    "{account_id}",
    %{to: "+18015551234", body: "Hello from Surge!"}
  )

IO.puts(message.id)

curl -X POST https://api.surge.app/accounts/{account_id}/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to": "+18015551234", "body": "Hello from Surge!"}'

from surge import Surge

surge = Surge()  # reads SURGE_API_KEY from environment

message = surge.messages.create(
    account_id="{account_id}",
    to="+18015551234",
    body="Hello from Surge!",
)

print(message.id)

import Surge from "@surgeapi/node";

const surge = new Surge(); // reads SURGE_API_KEY from environment

const message = await surge.messages.create("{account_id}", {
  to: "+18015551234",
  body: "Hello from Surge!",
});

console.log(message.id);

require "surge_api"

surge = SurgeAPI::Client.new # reads SURGE_API_KEY from environment

message = surge.messages.create(
  "{account_id}",
  to: "+18015551234",
  body: "Hello from Surge!"
)

puts message.id

client = Surge.Client.new(System.get_env("SURGE_API_KEY"))

{:ok, message} =
  Surge.Messages.create(
    client,
    "{account_id}",
    %{to: "+18015551234", body: "Hello from Surge!"}
  )

IO.puts(message.id)

curl -X POST https://api.surge.app/accounts/{account_id}/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to": "+18015551234", "body": "Hello from Surge!"}'

The quickstart walks through this step by step, including how to get your API key and account ID.

Next steps