sendly

sendly

Official Python SDK for the Sendly SMS API.

Installation

pip install sendly

Requirements

• Python 3.8+
• A Sendly API key (get one here)

Quick Start

from sendly import Sendly

# Initialize with your API key
client = Sendly('sk_live_v1_your_api_key')

# Send an SMS
message = client.messages.send(
    to='[phone]',
    text='Hello from Sendly!'
)

print(f'Message sent: {message.id}')
print(f'Status: {message.status}')

Prerequisites for Live Messaging

Before sending live SMS messages, you need:

• Business Verification - Complete verification in the Sendly dashboard

  • International: Instant approval (just provide Sender ID)
  • US/Canada: Requires carrier approval (3-7 business days)

• Credits - Add credits to your account

  • Test keys (sk_test_*) work without credits (sandbox mode)
  • Live keys (sk_live_*) require credits for each message

• Live API Key - Generate after verification + credits

  • Dashboard → API Keys → Create Live Key

Test vs Live Keys

Key Type	Prefix	Credits Required	Verification Required	Use Case
Test	sk_test_v1_*	No	No	Development, testing
Live	sk_live_v1_*	Yes	Yes	Production messaging

Note: You can start development immediately with a test key. Messages to sandbox test numbers are free and don't require verification.

Features

• ✅ Full type hints (PEP 484)
• ✅ Sync and async clients
• ✅ Automatic retries with exponential backoff
• ✅ Rate limit handling
• ✅ Pydantic models for data validation
• ✅ Python 3.8+ support

Usage

Sending Messages

from sendly import Sendly

client = Sendly('sk_live_v1_xxx')

# Basic usage
message = client.messages.send(
    to='[phone]',
    text='Your verification code is: 123456'
)

# With custom sender ID (international)
message = client.messages.send(
    to='[phone]',
    text='Hello from MyApp!',
    from_='MYAPP'
)

Listing Messages

# Get recent messages (default limit: 50)
result = client.messages.list()
print(f'Found {result.count} messages')

# Get last 10 messages
result = client.messages.list(limit=10)

# Iterate through messages
for msg in result.data:
    print(f'{msg.to}: {msg.status}')

Getting a Message

message = client.messages.get('msg_xxx')

print(f'Status: {message.status}')
print(f'Delivered: {message.delivered_at}')

Rate Limit Information

# After any API call, check rate limit status
client.messages.send(to='+1555...', text='Hello!')

rate_limit = client.get_rate_limit_info()
if rate_limit:
    print(f'{rate_limit.remaining}/{rate_limit.limit} requests remaining')
    print(f'Resets in {rate_limit.reset} seconds')

Async Client

For async/await support, use AsyncSendly:

import asyncio
from sendly import AsyncSendly

async def main():
    async with AsyncSendly('sk_live_v1_xxx') as client:
        # Send a message
        message = await client.messages.send(
            to='[phone]',
            text='Hello from async!'
        )
        print(message.id)

        # List messages
        result = await client.messages.list(limit=10)
        for msg in result.data:
            print(f'{msg.to}: {msg.status}')

asyncio.run(main())

Configuration

from sendly import Sendly, SendlyConfig

# Using keyword arguments
client = Sendly(
    api_key='sk_live_v1_xxx',
    base_url='https://sendly.live/api',  # Optional
    timeout=60.0,  # Optional: seconds (default: 30)
    max_retries=5  # Optional: (default: 3)
)

# Using config object
config = SendlyConfig(
    api_key='sk_live_v1_xxx',
    timeout=60.0,
    max_retries=5
)
client = Sendly(config=config)

Error Handling

The SDK provides typed exception classes:

from sendly import (
    Sendly,
    SendlyError,
    AuthenticationError,
    RateLimitError,
    InsufficientCreditsError,
    ValidationError,
    NotFoundError,
)

client = Sendly('sk_live_v1_xxx')

try:
    message = client.messages.send(
        to='[phone]',
        text='Hello!'
    )
except AuthenticationError as e:
    print(f'Invalid API key: {e.message}')
except RateLimitError as e:
    print(f'Rate limited. Retry after {e.retry_after} seconds')
except InsufficientCreditsError as e:
    print(f'Need {e.credits_needed} credits, have {e.current_balance}')
except ValidationError as e:
    print(f'Invalid request: {e.message}')
except NotFoundError as e:
    print(f'Resource not found: {e.message}')
except SendlyError as e:
    print(f'API error [{e.code}]: {e.message}')

Testing (Sandbox Mode)

Use a test API key (sk_test_v1_xxx) for testing:

from sendly import Sendly, SANDBOX_TEST_NUMBERS

client = Sendly('sk_test_v1_xxx')

# Check if in test mode
print(client.is_test_mode())  # True

# Use sandbox test numbers
message = client.messages.send(
    to=SANDBOX_TEST_NUMBERS.SUCCESS,  # [phone]
    text='Test message'
)

# Test error scenarios
message = client.messages.send(
    to=SANDBOX_TEST_NUMBERS.INVALID,  # [phone]
    text='This will fail'
)

Available Test Numbers

Number	Behavior
[phone]	Instant success
[phone]	Success after 10s delay
[phone]	Fails: invalid_number
[phone]	Fails: carrier_rejected (2s delay)
[phone]	Fails: rate_limit_exceeded

Pricing Tiers

from sendly import CREDITS_PER_SMS, SUPPORTED_COUNTRIES, PricingTier

# Credits per SMS by tier
print(CREDITS_PER_SMS[PricingTier.DOMESTIC])  # 1 (US/Canada)
print(CREDITS_PER_SMS[PricingTier.TIER1])     # 8 (UK, Poland, etc.)
print(CREDITS_PER_SMS[PricingTier.TIER2])     # 12 (France, Japan, etc.)
print(CREDITS_PER_SMS[PricingTier.TIER3])     # 16 (Germany, Italy, etc.)

# Supported countries by tier
print(SUPPORTED_COUNTRIES[PricingTier.DOMESTIC])  # ['US', 'CA']
print(SUPPORTED_COUNTRIES[PricingTier.TIER1])     # ['GB', 'PL', ...]

Utilities

The SDK exports validation utilities:

from sendly import (
    validate_phone_number,
    get_country_from_phone,
    is_country_supported,
    calculate_segments,
)

# Validate phone number format
validate_phone_number('[phone]')  # OK
validate_phone_number('555-1234')  # Raises ValidationError

# Get country from phone number
get_country_from_phone('[phone]')  # 'GB'
get_country_from_phone('[phone]')   # 'US'

# Check if country is supported
is_country_supported('GB')  # True
is_country_supported('XX')  # False

# Calculate SMS segments
calculate_segments('Hello!')  # 1
calculate_segments('A' * 200)  # 2

Type Hints

The SDK is fully typed. Import types for your IDE:

from sendly import (
    SendlyConfig,
    SendMessageRequest,
    Message,
    MessageStatus,
    ListMessagesOptions,
    MessageListResponse,
    RateLimitInfo,
    PricingTier,
)

Context Manager

Both sync and async clients support context managers:

# Sync
with Sendly('sk_live_v1_xxx') as client:
    message = client.messages.send(to='+1555...', text='Hello!')

# Async
async with AsyncSendly('sk_live_v1_xxx') as client:
    message = await client.messages.send(to='+1555...', text='Hello!')

API Reference

Sendly / AsyncSendly

Constructor

Sendly(
    api_key: str,
    base_url: str = 'https://sendly.live/api',
    timeout: float = 30.0,
    max_retries: int = 3,
)

Properties

• messages - Messages resource
• base_url - Configured base URL

Methods

• is_test_mode() - Returns True if using a test API key
• get_rate_limit_info() - Returns current rate limit info
• close() - Close the HTTP client

client.messages

send(to, text, from_=None) -> Message

Send an SMS message.

list(limit=None) -> MessageListResponse

List sent messages.

get(id) -> Message

Get a specific message by ID.

Support

• 📚 Documentation
• 💬 Discord
• 📧 [e-mail]

License

MIT