aid: clicksend
url: https://raw.githubusercontent.com/api-evangelist/clicksend/refs/heads/main/apis.yml
name: ClickSend
kind: company
description: 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.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Communications
- SMS
- MMS
- Voice
- Email
- Post
- Messaging
- CPaaS
created: '2026-07-01'
modified: '2026-07-01'
specificationVersion: '0.19'
apis:
- aid: clicksend:clicksend-sms-api
  name: ClickSend SMS API
  tags:
  - SMS
  - Messaging
  - Text
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/messaging/sms
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/messaging/sms
    type: Documentation
  - url: https://developers.clicksend.com/docs/rest/v3/
    type: APIReference
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-mms-api
  name: ClickSend MMS API
  tags:
  - MMS
  - Multimedia
  - Messaging
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/messaging/mms
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/messaging/mms
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-voice-api
  name: ClickSend Voice / Text-to-Speech API
  tags:
  - Voice
  - Text to Speech
  - TTS
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/messaging/voice-messaging
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/messaging/voice-messaging
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-email-api
  name: ClickSend Transactional Email API
  tags:
  - Email
  - Transactional
  - Messaging
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/messaging/email
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/messaging/email
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-post-letters-api
  name: ClickSend Post - Letters API
  tags:
  - Post
  - Letters
  - Direct Mail
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/post/letters
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/post/letters
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-post-postcards-api
  name: ClickSend Post - Postcards API
  tags:
  - Post
  - Postcards
  - Direct Mail
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/post/postcards
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/post/postcards
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-contacts-lists-api
  name: ClickSend Contacts & Lists API
  tags:
  - Contacts
  - Lists
  - Address Book
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/contacts
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/contacts
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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.
- aid: clicksend:clicksend-delivery-receipts-api
  name: ClickSend Delivery Receipts & Inbound API
  tags:
  - Delivery Receipts
  - Webhooks
  - Inbound
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/messaging/sms/receive-sms
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/messaging/sms/receive-sms
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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/*.
- aid: clicksend:clicksend-account-balance-api
  name: ClickSend Account & Balance API
  tags:
  - Account
  - Balance
  - Billing
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.clicksend.com/docs/account
  baseURL: https://rest.clicksend.com/v3
  properties:
  - url: https://developers.clicksend.com/docs/account
    type: Documentation
  - url: openapi/clicksend-openapi.yml
    type: OpenAPI
  - url: collections/clicksend.postman_collection.json
    type: PostmanCollection
  - url: collections/clicksend.opencollection.json
    type: OpenCollection
  description: 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/*.
common:
- type: TrustCenter
  url: security/clicksend-trust-center.yml
- type: DomainSecurity
  url: security/clicksend-domain-security.yml
- type: Authentication
  url: authentication/clicksend-authentication.yml
- type: GitHubOrganization
  url: https://github.com/ClickSend
- type: LinkedIn
  url: https://www.linkedin.com/company/clicksend
- type: Website
  url: https://www.clicksend.com/
- type: Documentation
  url: https://developers.clicksend.com/
- type: Plans
  url: plans/clicksend-plans-pricing.yml
- type: RateLimits
  url: rate-limits/clicksend-rate-limits.yml
- type: FinOps
  url: finops/clicksend-finops.yml
- url: https://blog.clicksend.com/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com