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Developers

SDKs and libraries

Every feature is a plain HTTPS request, so the HTTP client you already use is all you need.

API referenceQuickstart

Send a text from your language

The same request in each tab. The API key pair goes in the x-key and x-secret headers.

curl
curl -X POST https://api-v2.dropcowboy.com/sms \
  -H "x-key: $DC_KEY" -H "x-secret: $DC_SECRET" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+13125550142",
    "phone_line_id": "e2b6f9a3-5c1d-4e8b-a4f7-9c3e1b5d7a28",
    "body": "Your order is ready for pickup. Reply STOP to opt out."
  }'
JavaScript (Node 18+)
const res = await fetch('https://api-v2.dropcowboy.com/sms', {
  method: 'POST',
  headers: {
    'x-key': process.env.DC_KEY,
    'x-secret': process.env.DC_SECRET,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    to: '+13125550142',
    phone_line_id: 'e2b6f9a3-5c1d-4e8b-a4f7-9c3e1b5d7a28',
    body: 'Your order is ready for pickup. Reply STOP to opt out.'
  })
});

// 202 means accepted. The result arrives on the contact.sms.status webhook.
console.log(res.status, await res.json());
Python (requests)
import os
import requests

res = requests.post(
    "https://api-v2.dropcowboy.com/sms",
    headers={"x-key": os.environ["DC_KEY"], "x-secret": os.environ["DC_SECRET"]},
    json={
        "to": "+13125550142",
        "phone_line_id": "e2b6f9a3-5c1d-4e8b-a4f7-9c3e1b5d7a28",
        "body": "Your order is ready for pickup. Reply STOP to opt out.",
    },
    timeout=30,
)

# 202 means accepted. The result arrives on the contact.sms.status webhook.
print(res.status_code, res.json())

Ways to integrate

REST API

Messaging, email, campaigns, contacts, voice and AI agents over HTTPS on https://api-v2.dropcowboy.com.

API reference

Building Blocks

Ready-made dialer, inbox, contacts and texting registration UI you load with one script tag.

Building Blocks

MCP for AI tools

Let Cursor, VS Code, Claude and other MCP clients work with your account.

Connect AI tools

Webhooks

Signed events for every send result, reply and agent call.

Webhooks

Authentication

API key pairs for most integrations, OAuth client credentials for server-to-server apps.

Authentication

Quickstart

Copy-paste flows for the common jobs, from your first send to a working AI receptionist.

Quickstart

Questions

Do I need to install a package?
No. Call the REST API directly with fetch, axios, requests or any other HTTP client. The docs show curl, JavaScript and Python for each flow.
Which base URL do I use?
Every v2 route is under https://api-v2.dropcowboy.com. Authenticate with the x-key and x-secret headers, or with an OAuth bearer token from https://login.dropcowboy.com/oauth/token.
Can I embed Drop Cowboy® UI instead of building it?
Yes. Building Blocks load a ready-made dialer, inbox, contacts and texting-registration UI into your app with one script and a short-lived token minted by your server.

Start building

Get an API keyAPI reference