Omnisend Event Metadata API
The Event Metadata API from Omnisend — 3 operation(s) for declaring, merging and querying brand-custom event schemas. The only Omnisend operations that carry an operationId.
Omnisend Event Metadata API is one of 15 APIs that Omnisend publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
This API exposes 2 JSON Schema definitions.
Tagged areas include EventMetadata, Event, and Schemas. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, authentication docs, a JSON-LD context, and 2 JSON Schemas.
This API exposes 3 operations across 2 paths, and defines 9 schemas. It is described by OpenAPI 3.0.0, at version 2026-preview.
Requests are made against a single base URL, https://api.omnisend.com/api.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 2
Omnisend Event Metadata API declares
2 security schemes
for authenticating requests.
An API key is passed in the header as Authorization (ApiKeyAuth).
It supports OAuth 2.0 (Bearer) using the clientCredentials flow, exposing 1 scope.
ApiKeyAuth— API Key authentication. Value format: 'Omnisend-API-Key {api-key}'
Paths & Operations 3
Across 2 paths, the API surfaces 3 operations — 2 POST, 1 PUT. Each is listed below with its method, path, parameters, and response codes.
Schemas 9
The contract defines 9 schemas that model the data the API accepts and returns. The most detailed are RateLimitProblem (6 properties), PropertyNode (6 properties), EventItem (5 properties), QueryEventsRequest (5 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from Omnisend 12
Other APIs Omnisend publishes across the network.
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