Marginalia Search

Marginalia Search Filters API

Manage named search filters (new API only).

Documentation GitHub OpenAPI

Operations 4

GET /filter List configured filters #

GET /filter/{name} Retrieve a filter definition #

POST /filter/{name} Create a named filter #

DELETE /filter/{name} Delete a filter #

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/marginalia-search-filters-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

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

openapi: 3.2.0
info:
  title: Marginalia Search Filters API
  description: The Marginalia Search API provides programmatic access to the Marginalia independent search engine, focused on non-commercial content. The new API is hosted at api2.marginalia-search.com; legacy endpoints at api.marginalia.nu and api.marginalia-search.com remain available but deprecated. Search results are available under CC-BY-NC-SA 4.0 for non-commercial use.
  version: 2.0.0
  contact:
    name: Marginalia Search
    email: contact@marginalia-search.com
    url: https://about.marginalia-search.com/article/api/
  license:
    name: CC-BY-NC-SA 4.0
    url: https://creativecommons.org/licenses/by-nc-sa/4.0/
servers:
- url: https://api2.marginalia-search.com
  description: Marginalia Search API v2 (current)
- url: https://api.marginalia-search.com
  description: Legacy API endpoint
- url: https://api.marginalia.nu
  description: Legacy API endpoint (original)
security:
- APIKey: []
tags:
- name: Filters
  description: Manage named search filters (new API only).
paths:
  /filter:
    get:
      operationId: listFilters
      summary: List configured filters
      tags:
      - Filters
      responses:
        '200':
          description: List of filter names.
          content:
            application/json:
              schema:
                type: array
                items:
                  type: string
  /filter/{name}:
    parameters:
    - name: name
      in: path
      required: true
      schema:
        type: string
      description: Filter name.
    get:
      operationId: getFilter
      summary: Retrieve a filter definition
      tags:
      - Filters
      responses:
        '200':
          description: Filter definition (XML).
          content:
            application/xml:
              schema:
                type: string
        '404':
          description: Filter not found.
    post:
      operationId: createFilter
      summary: Create a named filter
      description: Create or update a filter. Filter bodies are XML supporting domain inclusion/exclusion, temporal bias, term filtering, and parameter constraints (year, quality, size, rank).
      tags:
      - Filters
      requestBody:
        required: true
        content:
          application/xml:
            schema:
              type: string
      responses:
        '200':
          description: Filter created or updated.
        '400':
          description: Invalid filter definition.
    delete:
      operationId: deleteFilter
      summary: Delete a filter
      tags:
      - Filters
      responses:
        '204':
          description: Filter deleted.
        '404':
          description: Filter not found.
components:
  securitySchemes:
    APIKey:
      type: apiKey
      in: header
      name: API-Key
      description: API key supplied via the API-Key header. A public testing key is documented; commercial and non-commercial keys are issued by contact@marginalia-search.com or via Polar.
externalDocs:
  description: Marginalia Search API Documentation
  url: https://about.marginalia-search.com/article/api/