NOAA — National Oceanic and Atmospheric Administration

CO-OPS Metadata API (MDAPI v1)

The CO-OPS Metadata API exposes station inventory, harmonic constituents, NOS PORTS station lists, flood thresholds, and high/low water station catalogs. Supports radius and bounding-box station discovery and returns JSON or XML. Stable endpoint at api.tidesandcurrents.noaa.gov/mdapi/prod.

GitHub

Documentation

📖
Documentation
https://api.tidesandcurrents.noaa.gov/mdapi/prod/

Other Resources

🔗
ChangeLog
https://api.tidesandcurrents.noaa.gov/mdapi/prod/releasenotes.html

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/co-ops-metadata-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.

API entry from apis.yml

apis.yml Raw ↑ 
aid: noaa-gov:co-ops-metadata-api
name: CO-OPS Metadata API (MDAPI v1)
description: The CO-OPS Metadata API exposes station inventory, harmonic constituents, NOS PORTS station
  lists, flood thresholds, and high/low water station catalogs. Supports radius and bounding-box station
  discovery and returns JSON or XML. Stable endpoint at api.tidesandcurrents.noaa.gov/mdapi/prod.
humanURL: https://api.tidesandcurrents.noaa.gov/mdapi/prod/
baseURL: https://api.tidesandcurrents.noaa.gov/mdapi/prod/webapi
tags:
- Ocean
- Metadata
- Stations
- Ports
tags_raw:
- Ocean
- Metadata
- Stations
- PORTS
properties:
- url: https://api.tidesandcurrents.noaa.gov/mdapi/prod/
  type: Documentation
- url: https://api.tidesandcurrents.noaa.gov/mdapi/prod/releasenotes.html
  type: ChangeLog