Dagster

Dagster Materializations API

Report asset materialization events.

GitHub OpenAPI

Operations 1

POST /report_asset_materialization/ Report asset materialization #

Documentation

📖
Documentation
https://docs.dagster.io/api/rest-apis/external-assets-rest-api

Specifications

⚙
OpenAPI
https://artifacts.apis.io/dagster/openapi/dagster-materializations-api-openapi.yml

Schemas & Data

📊
JSONSchema
https://artifacts.apis.io/dagster/json-schema/asset-materialization.json
📊
JSONSchema
https://artifacts.apis.io/dagster/json-schema/asset-check.json
📊
JSONSchema
https://artifacts.apis.io/dagster/json-schema/asset-observation.json

Other Resources

🔗
Rules
https://artifacts.apis.io/dagster/rules/dagster-external-assets-rest-api-rules.yml

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/dagster:dagster-materializations-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

dagster-materializations-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Dagster External Assets REST Materializations API
  description: The Dagster External Assets REST API provides endpoints to report asset materializations, asset check evaluations, and asset observations for external assets back to Dagster. This allows you to notify Dagster that an external asset has been updated and include metadata about the event.
  version: '1.0'
  contact:
    name: Dagster
    url: https://dagster.io/
servers:
- url: http://localhost:3000
  description: Local Dagster webserver
- url: https://{org}.dagster.plus/{deployment}
  description: Dagster+ Cloud deployment
  variables:
    org:
      default: my-org
      description: Dagster+ organization slug
    deployment:
      default: prod
      description: Dagster+ deployment name
tags:
- name: Materializations
  description: Report asset materialization events.
paths:
  /report_asset_materialization/:
    post:
      operationId: reportAssetMaterialization
      summary: Report asset materialization
      description: Records an asset materialization event for an external asset, with optional metadata, partition, data version, and description.
      tags:
      - Materializations
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/AssetMaterialization'
      responses:
        '200':
          description: Materialization recorded successfully
          content:
            application/json:
              schema:
                type: object
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    AssetMaterialization:
      type: object
      required:
      - asset_key
      properties:
        asset_key:
          type: string
          description: The asset key being materialized.
        metadata:
          type: object
          description: Free-form key/value metadata about the materialization.
          additionalProperties: true
        data_version:
          type: string
          description: A user-supplied data version identifier.
        description:
          type: string
          description: A human-readable description of the materialization.
        partition:
          type: string
          description: The asset partition associated with the materialization.
    Error:
      type: object
      properties:
        error:
          type: string
          description: Error message describing the failure.
  securitySchemes:
    DagsterCloudToken:
      type: apiKey
      in: header
      name: Dagster-Cloud-Api-Token
      description: User token used to authenticate against Dagster+ deployments.