Feature

CORS Support

Browser-callable endpoints with CORS headers.

8 providers 23 APIs 5 declared variants

CORS headers permit direct calls from browser JavaScript without a proxy. Decides whether a frontend can integrate without standing up backend infrastructure.

8 API providers on the APIs.io network offer cors support. The highest-rated are Highlight (highlight.io), Amazon MediaStore, ReqRes, Frankfurter, Ron Swanson Quotes.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 1 Complete, well-documented, and agent-ready
Highlight (highlight.io)Highlight (highlight.io) is the open-source, full-stack monitoring platform — session replay, error monitor...5 APIs66.8
Developing 3 Usable, with meaningful gaps to close
Amazon MediaStoreAWS Elemental MediaStore is an AWS storage service optimized for media, providing the performance, consiste...1 API53.0ReqResReqRes (reqres.in) is a hosted REST API originally launched by Ben Howdle as a free no-auth fake-API surfac...6 APIs43.2FrankfurterFrankfurter is an open-source (MIT) currency exchange rates API that blends foreign-exchange reference rate...2 APIs40.0
Thin 3 Limited public surface area
Ron Swanson QuotesA community-built, open source HTTP API that returns Ron Swanson quotes from the NBC television series Park...1 API35.0JSONPlaceholderJSONPlaceholder is a free, no-auth fake REST API for prototyping, tutorials, and testing. It exposes six re...1 API34.9Numbers APINumbers API by David Hu and Mack Duan — a free, community-contributed HTTP API for interesting facts about ...1 API30.7
Emerging 1 Early or largely undocumented
CMA CGMCMA CGM is a Marseille-headquartered French container shipping, logistics, and port operator and the third-...6 APIs15.8

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

CMA Média portfolio includes La Provence, Corse-Matin, La Tribune, BFM-RMC, BrutCORS EnabledCORS SupportOpen CORSSession replay built on rrweb with canvas, iframe, and cross-origin support

Scroll for all 5

Work with this as data

Every feature here is available over the APIs.io API and to AI agents over MCP. Features is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

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

https://apis.io/mcp

Tools for features

3 MCP tools reach this
  • 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
Search the catalog 
curl "https://apis.io/api/v1/search?q=cors-support&limit=10"
Everything under a tag 
curl "https://apis.io/api/v1/tags/cors-support"

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

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

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