Sendly Python SDK

Official Python SDK for Sendly - SMS for developers.

Installation

pip install sendly

Quick Start

from sendly import Sendly

# Initialize the client
client = Sendly(api_key='sl_test_your_api_key_here')

# Send an SMS
response = client.sms.send(
    to='+14155552671',
    text='Hello from Sendly!'
)

print(f"Message sent! ID: {response.id}")

Features

• Instant setup - From pip install to first SMS in under 2 minutes
• Smart routing - Automatic number selection for optimal delivery
• Type hints - Full typing support throughout
• Auto-retry - Exponential backoff for failed requests
• Context managers - Pythonic resource management
• Error handling - Comprehensive exception types

Authentication

Get your API key from the Sendly Dashboard.

Environment Variable (Recommended)

export SENDLY_API_KEY="sl_test_your_api_key_here"

from sendly import Sendly

# API key automatically loaded from environment
client = Sendly()

Direct Initialization

client = Sendly(api_key='sl_test_your_api_key_here')

Custom Configuration

client = Sendly(
    api_key='sl_test_your_api_key_here',
    base_url='https://api.sendly.live',
    timeout=30.0,
    max_retries=3
)

Basic Usage

Send SMS

response = client.sms.send(
    to='+14155552671',
    text='Hello from Sendly!'
)

print(f"Message ID: {response.id}")
print(f"Status: {response.status}")
print(f"From: {response.from_}")
print(f"Cost: ${response.cost.amount}")

Message Types

# Transactional messages
client.sms.send(
    to='+14155552671',
    text='Your order #12345 has shipped!',
    message_type='transactional'
)

# OTP/Verification messages
client.sms.send(
    to='+14155552671',
    text='Your verification code: 123456',
    message_type='otp'
)

# Marketing messages
client.sms.send(
    to='+14155552671',
    text='50% off sale this weekend!',
    message_type='marketing'
)

Context Manager (Recommended)

with Sendly(api_key='sl_test_your_api_key_here') as client:
    response = client.sms.send(
        to='+14155552671',
        text='Hello from Sendly!'
    )

Advanced Features

Webhooks

response = client.sms.send(
    to='+14155552671',
    text='Your verification code: 789012',
    webhook_url='https://myapp.com/webhook/sms',
    webhook_failover_url='https://myapp.com/webhook/backup'
)

Tags

response = client.sms.send(
    to='+14155552671',
    text='Welcome to our platform!',
    tags=['onboarding', 'welcome', 'user-123']
)

Batch Processing

import time

recipients = [
    {'phone': '+14155552671', 'name': 'Alice'},
    {'phone': '+14155552672', 'name': 'Bob'},
    {'phone': '+14155552673', 'name': 'Charlie'}
]

for recipient in recipients:
    try:
        response = client.sms.send(
            to=recipient['phone'],
            text=f"Hello {recipient['name']}!",
            tags=['batch', f"user-{recipient['name'].lower()}"]
        )
        print(f"Sent to {recipient['name']}: {response.id}")
    except Exception as e:
        print(f"Failed to send to {recipient['name']}: {e}")
    
    time.sleep(0.1)

Error Handling

from sendly.errors import (
    ValidationError,
    AuthenticationError,
    RateLimitError,
    APIError
)

try:
    response = client.sms.send(
        to='+14155552671',
        text='Hello Sendly!'
    )
except ValidationError as e:
    print(f"Validation error: {e.message}")
except AuthenticationError as e:
    print(f"Authentication error: {e.message}")
except RateLimitError as e:
    print(f"Rate limit error: {e.message}")
    if e.retry_after:
        print(f"Retry after: {e.retry_after} seconds")
except APIError as e:
    print(f"API error: {e.message}")
    print(f"Status code: {e.status_code}")

Sandbox Testing

Use test API keys for development. The sandbox provides magic numbers for testing different scenarios:

Success Scenarios

Phone Number	Behavior
+15550001234	Instant delivery
+15550001010	10 second delay
+15550001030	30 second delay

Error Scenarios

Phone Number	Error Type	HTTP Status
+15550009999	Invalid number	400
+15550009998	Carrier rejection	400
+15550009997	Rate limit exceeded	429
+15550009996	Timeout error	500

Example:

from sendly import Sendly
from sendly.errors import RateLimitError

# Initialize with test API key
client = Sendly(api_key='sl_test_YOUR_TEST_KEY')

# Test instant success
response = client.sms.send(
    to='+15550001234',
    text='Testing instant delivery'
)
print(f"Success: {response.status}")

# Test rate limit error
try:
    response = client.sms.send(
        to='+15550009997',
        text='Testing rate limit'
    )
except RateLimitError as e:
    print(f"Rate limit error: {e.message}")
    print(f"Retry after: {e.retry_after} seconds")

API Reference

Client Initialization

Sendly(
    api_key: str = None,
    base_url: str = "https://api.sendly.live",
    timeout: float = 30.0,
    max_retries: int = 3
)

SMS Methods

client.sms.send()

client.sms.send(
    to: str,
    text: str,
    from_: str = None,
    message_type: str = None,
    webhook_url: str = None,
    webhook_failover_url: str = None,
    tags: List[str] = None
) -> SMSResponse

Parameters:

• to - Destination phone number (E.164 format)
• text - Message text (required)
• from_ - Sender number (auto-selected if not provided)
• message_type - Message type: transactional, otp, marketing, alert
• webhook_url - HTTPS webhook URL for delivery notifications
• webhook_failover_url - HTTPS backup webhook URL
• tags - Message tags for analytics (max 20, 50 chars each)

Response Objects

SMSResponse

class SMSResponse:
    id: str
    status: str
    from_: str
    to: str
    text: str
    created_at: str
    segments: int
    cost: CostInfo
    routing: RoutingInfo

Testing

# Install development dependencies
pip install -e ".[dev]"

# Run unit tests
pytest tests/unit/

# Run integration tests
pytest tests/integration/

# Run all tests with coverage
pytest --cov=sendly --cov-report=html

Development

# Clone the repository
git clone https://github.com/sendly-live/sendly-python.git
cd sendly-python

# Install in development mode
pip install -e ".[dev]"

# Run tests
pytest

# Run linting
flake8 sendly/
black sendly/
isort sendly/

License

MIT

Support

• Email: support@sendly.live
• Documentation: https://docs.sendly.live
• Issues: GitHub Issues