public apis
/
CategoriesMCPBlogRandomStar
Public APIs

A searchable directory of 2,000+ free public APIs, curated by the community and maintained with APILayer.

Powered byAPILayer

Popular

  • Weather APIs
  • Finance APIs
  • Crypto APIs
  • Geocoding APIs
  • Machine learning APIs
  • Games APIs

Directory

  • Categories
  • All APIs
  • MCP servers
  • FAQ
  • Stats
  • JSON API
  • llms.txt

APILayer

  • Browse the API suite ↗
  • Get a free API key ↗
  • APILayer blog ↗
  • Postman collection ↗
  • Discord community ↗

Project

  • public-apis on GitHub ↗
  • Contribute an API ↗
Public APIs · by APILayerData from public-apis (MIT)
  1. Home
  2. /Geocoding
  3. /OnWater
Geocoding
OnWater logo

OnWater

Determine if a lat/lon is on water or land.

OnWater API is a free Geocoding API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

Authentication
None required
HTTPS
Yes
CORS
Unknown
Category
Geocoding
Visit documentation ↗onwater.io

About IsItWater

Provider
IsItWater
Website
onwater.io ↗

Details from onwater.io.

APILayer

Unified API suite · now live

Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.

Get your free API key→Free tier on every API

OnWater API alternatives

One Map, Singapore logo

One Map, Singapore

Singapore Land Authority REST API services for Singapore addresses

apiKeyHTTPSCORS ?
Open Topo Data logo

Open Topo Data

Elevation and ocean depth for a latitude and longitude

No authHTTPSNo CORS
Nominatim logo

Nominatim

Provides worldwide forward / reverse geocoding

No authHTTPSCORS
OpenCage logo

OpenCage

Forward and reverse geocoding using open data

apiKeyHTTPSCORS
N

Network Data Labs

IP geolocation with accuracy radius, ASN, and flags for Tor exits, known VPN networks and hosting

apiKeyHTTPSNo CORS
openrouteservice.org logo

openrouteservice.org

Directions, POIs, isochrones, geocoding (+reverse), elevation, and more

apiKeyHTTPSCORS ?

OnWater API FAQ

Who provides the OnWater API?

The OnWater API is provided by IsItWater (onwater.io).

Is the OnWater API free?

Yes. The OnWater API is listed in the Geocoding category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.

Does the OnWater API require an API key?

No. The OnWater API requires no authentication, so you can start making requests without signing up.

Can I call the OnWater API from the browser?

CORS support for the OnWater API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.

Does the OnWater API support HTTPS?

Yes. The OnWater API is served over HTTPS, so it's safe to use in production.