Send SMS through direct carrier connections. Delivery confirms in seconds. Inbound replies webhook to your endpoint.
SMS delivery
Send transactional SMS messages to phone numbers worldwide through a single API. Pass a list of recipients across multiple countries, and Conjoin automatically selects the appropriate sender ID for each destination while routing through optimal carrier paths.
Capabilities
Send SMS worldwide through direct carrier connections. Automatic routing selects the optimal path based on destination, deliverability, and cost.
Receive inbound SMS replies on dedicated numbers. Replies trigger webhooks to your endpoint with sender information and message content.
Track message state from queued to delivered with webhook notifications. Know within seconds whether your SMS reached the recipient's device, and track delivery status in real time.
Send thousands of messages per second. Conjoin handles carrier routing, queue management, and deliverability while you send messages.
Messages exceeding 160 characters split into segments automatically. Recipients see one unified message while you pay per segment used.
Messages route through optimal carrier paths selected automatically based on destination, network conditions, and deliverability metrics. Failed routes trigger instant failover to alternate carriers.
Pass a list of recipients spanning multiple countries in a single API call. Conjoin splits the message by country and selects the appropriate sender ID for each destination automatically.
Each country has different sender ID requirements and regulations. Conjoin automatically assigns compliant sender IDs per destination, whether alphanumeric, shortcode, or local number.
Messages route through optimal carrier paths selected automatically based on destination, network conditions, and deliverability metrics. Failed routes trigger instant failover to alternate carriers.
Pass a list of recipients spanning multiple countries in a single API call. Conjoin splits the message by country and selects the appropriate sender ID for each destination automatically.
Each country has different sender ID requirements and regulations. Conjoin automatically assigns compliant sender IDs per destination, whether alphanumeric, shortcode, or local number.
Reach recipients worldwide
Time to recipient device
Messages reaching valid numbers
Why it matters
Send your first SMS in minutes after API key creation. Call the send endpoint with a phone number and message. The message routes through optimized carrier paths without carrier negotiations.
A message to a US mobile number fails on the primary carrier. The system automatically retries through a secondary route within seconds. Your application receives a single delivery confirmation without handling retry logic.
Send a single message to recipients in the US, Ghana, UK, Japan, and Brazil. Each recipient sees a sender ID that complies with their country's regulations: a toll-free number in the US, alphanumeric in Ghana, a local number in Japan, and a shortcode in Brazil.
A customer replies to your appointment reminder. The webhook hits your endpoint with the sender number, message content, and timestamp. Your application processes the reply without managing SMS infrastructure.
Built for Your Workflow
Send delivery status updates at each milestone with tracking links. Messages reach recipients within seconds through direct carrier connections, and delivery confirmation returns in the API response.
Reduce support tickets by keeping customers informed proactively at every delivery stage.
Pass recipients from different countries in a single API call. Conjoin selects compliant sender IDs for each destination automatically: toll-free in the US, alphanumeric in Ghana, local numbers in Japan, shortcodes in Brazil.
Send globally without managing country-specific sender configurations or carrier regulations.
Provision phone numbers through the API and configure webhook URLs for inbound messages. Replies route to your endpoint with sender number, message content, and timestamp.
Build two-way SMS conversations without provisioning numbers or managing inbound routing.
Query per-message pricing before sending to see segment counts and destination costs. Estimate total campaign costs before committing to sends.
Predict SMS costs accurately and optimize message length to stay within budget.
Start building with Conjoin today. Free tier includes everything you need to prototype and launch. Scale when you're ready.