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Sinch Messages API

Send and retrieve messages across all supported channels using a normalized message format.

Sinch Messages API is one of 35 APIs that Sinch publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

Tagged areas include Message. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an AsyncAPI specification.

This API exposes 4 operations across 3 paths, and defines 7 schemas. It is described by OpenAPI 3.2.0, at version 1.0.

Requests are made against 3 base URLs: https://us.conversation.api.sinch.com, https://eu.conversation.api.sinch.com, https://br.conversation.api.sinch.com.

4 operations 3 paths 7 schemas 1 DELETE2 GET1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0
Base URL
https://us.sms.api.sinch.com
Authentication
OAuth 2.0, HTTP Basic
Terms of Service
Resource Areas
1

Authentication & Security 2

Sinch Messages API declares 2 security schemes for authenticating requests. It supports OAuth 2.0 (oAuth2) using the clientCredentials flow. It accepts HTTP basic authentication (basicAuth). By default, every request must be authenticated.

  • oAuth2 — OAuth 2.0 client credentials flow using project key ID and secret.
  • basicAuth — Key ID as username and key secret as password.

Paths & Operations 4

Across 3 paths, the API surfaces 4 operations — 1 DELETE, 2 GET, 1 POST. Each is listed below with its method, path, parameters, and response codes.

Messages 4

Send and retrieve messages across all supported channels using a normalized message format.

POST
/v1/projects/{project_id}/messages:send
Send a Message
sendMessage 1 param body → 200400401
GET
/v1/projects/{project_id}/messages
List Messages
listMessages 7 params → 200401
GET
/v1/projects/{project_id}/messages/{message_id}
Get a Message
getMessage 2 params → 200401404
DELETE
/v1/projects/{project_id}/messages/{message_id}
Delete a Message
deleteMessage 2 params → 200401404

Schemas 7

The contract defines 7 schemas that model the data the API accepts and returns. The most detailed are ConversationMessage (9 properties), SendMessageRequest (8 properties), AppMessage (5 properties), ChannelIdentity (3 properties). Each schema is shown below with its type and property counts.

ChannelIdentity
object
3 properties
MessageList
object
2 properties
ConversationMessage
object
9 properties
AppMessage
object
5 properties
Choice
object
2 properties
SendMessageResponse
object
2 properties
SendMessageRequest
object
8 properties 3 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

sinch-messages-api-openapi.yml Raw ↑

Other APIs Sinch publishes across the network.

Sinch Access Control Lists API
Sinch Active Numbers API
Sinch Applications API
Sinch Apps API
Sinch Available Numbers API
Sinch Available Regions API
Sinch Batches API
Sinch Brand Metadata API
Sinch Brands API
Sinch Callouts API
Sinch Calls API
Sinch Capability API
Where this information came from

This is an independent, third-party profile of Sinch Messages API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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