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Signal Registration API

Account registration endpoints for creating new Signal accounts via phone number verification.

Signal Registration API is one of 14 APIs that Signal publishes on the APIs.io network, described by a machine-readable OpenAPI specification and an AsyncAPI event-driven specification.

This API exposes 1 JSON Schema definition.

Tagged areas include Registration. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an AsyncAPI specification, a JSON-LD context, and 1 JSON Schema.

This API exposes 1 operation across 1 path, and defines 3 schemas. It is described by OpenAPI 3.2.0, at version 2.0.

Requests are made against a single base URL, https://chat.signal.org.

1 operations 1 paths 3 schemas 1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
2.0
Base URL
https://chat.signal.org
Authentication
HTTP Basic, HTTP Bearer
License
Terms of Service
Resource Areas
1

Authentication & Security 2

Signal Registration API declares 2 security schemes for authenticating requests. It accepts HTTP basic authentication (basicAuth). It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

  • basicAuth — HTTP Basic authentication using the account UUID (or phone number) and password. The password is established during account registration.
  • bearerAuth — Bearer token authentication used for certain provisioning and registration flows.

Paths & Operations 1

Across 1 path, the API surfaces 1 operation — 1 POST. Each is listed below with its method, path, parameters, and response codes.

Registration 1

Account registration endpoints for creating new Signal accounts via phone number verification.

POST
/v1/registration
Register a new account
registerAccount body → 200400409429

Schemas 3

The contract defines 3 schemas that model the data the API accepts and returns. The most detailed are AccountAttributes (7 properties), RegistrationResponse (4 properties), RegistrationRequest (3 properties). Each schema is shown below with its type and property counts.

RegistrationResponse
object
4 properties
AccountAttributes
object
7 properties
RegistrationRequest
object
3 properties 2 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

signal-registration-api-openapi.yml Raw ↑

Other APIs Signal publishes across the network.

Signal Protocol Specifications
Signal libsignal SDK
Signal Android SDK
Signal iOS SDK
Signal Desktop SDK
Signal Accounts API
Signal Attachments API
Signal Certificates API
Signal Devices API
Signal Keys API
Signal Messages API
Signal Profiles API
Where this information came from

This is an independent, third-party profile of Signal Registration 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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