ClickSend is a cloud communications company providing a single REST API for business messaging across SMS, MMS, voice / text-to-speech, transactional email, and physical post - letters and postcards printed and mailed globally. The v3 API (rest.clicksend.com/v3) uses HTTP Basic authentication with a username and API key and covers sending, delivery receipts, inbound handling, contacts and lists, and account balance.
APIs.json: https://raw.githubusercontent.com/api-evangelist/clicksend/refs/heads/main/apis.yml
- Communications
- SMS
- MMS
- Voice
- Post
- Messaging
- CPaaS
- Created: 2026-07-01
- Modified: 2026-07-01
Send single or bulk SMS worldwide, price a message before sending, view outbound history, cancel queued messages, and manage reusable SMS templates via POST /sms/send, /sms/price, /sms/history, /sms/{message_id}/cancel and /sms/templates.
- Human URL: https://developers.clicksend.com/docs/messaging/sms
- Base URL:
https://rest.clicksend.com/v3
- SMS
- Messaging
- Text
- Documentation
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Send multimedia messages with an image or media file and subject line, price MMS, and pull MMS history via POST /mms/send, /mms/price and GET /mms/history. Media is referenced from an uploaded file URL.
- Human URL: https://developers.clicksend.com/docs/messaging/mms
- Base URL:
https://rest.clicksend.com/v3
- MMS
- Multimedia
- Messaging
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Place automated voice calls that read text aloud via text-to-speech in a chosen language and voice, price the call, list supported languages, and cancel calls via POST /voice/send, /voice/price, GET /voice/lang and /voice/{message_id}/cancel.
- Human URL: https://developers.clicksend.com/docs/messaging/voice-messaging
- Base URL:
https://rest.clicksend.com/v3
- Voice
- Text to Speech
- TTS
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Send transactional email from verified sender addresses, price and view email history, and manage verified from-addresses via POST /email/send, /email/price, GET /email/history and /email/addresses.
- Human URL: https://developers.clicksend.com/docs/messaging/email
- Base URL:
https://rest.clicksend.com/v3
- Transactional
- Messaging
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Print and physically mail letters worldwide from an uploaded PDF, price a letter, validate a delivery address, and view history via POST /post/letters/send, /post/letters/price, /post/letters/detect-address and GET /post/letters/history.
- Human URL: https://developers.clicksend.com/docs/post/letters
- Base URL:
https://rest.clicksend.com/v3
- Post
- Letters
- Direct Mail
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Print and mail postcards worldwide from an uploaded PDF design, price a postcard, and view postcard history via POST /post/postcards/send, /post/postcards/price and GET /post/postcards/history.
- Human URL: https://developers.clicksend.com/docs/post/postcards
- Base URL:
https://rest.clicksend.com/v3
- Post
- Postcards
- Direct Mail
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Create and manage contact lists and the contacts within them, import contacts, remove duplicates, transfer and copy contacts between lists, and search across lists via /lists, /lists/{list_id}/contacts, /lists/{list_id}/import and /search/contacts-lists.
- Human URL: https://developers.clicksend.com/docs/contacts
- Base URL:
https://rest.clicksend.com/v3
- Contacts
- Lists
- Address Book
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Retrieve delivery receipts and inbound messages for SMS, MMS, voice and email, mark receipts and inbound messages as read, and configure automation rules that forward receipts and inbound messages to your webhook URLs via /sms/receipts, /sms/inbound, /voice/receipts, /mms/receipts and /automations/*.
- Human URL: https://developers.clicksend.com/docs/messaging/sms/receive-sms
- Base URL:
https://rest.clicksend.com/v3
- Delivery Receipts
- Webhooks
- Inbound
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
Retrieve account details including the current credit balance, view usage by month, manage subaccounts, and recharge account credit via GET /account, /account/usage/{year}/{month}/subaccount, /subaccounts and /recharge/*.
- Human URL: https://developers.clicksend.com/docs/account
- Base URL:
https://rest.clicksend.com/v3
- Account
- Balance
- Billing
- Documentation
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
FN: Kin Lane Email: kin@apievangelist.com