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What3Words

Three words as rememberable and unique coordinates worldwide

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API keyHTTPSNo CORSGeocoding

Checked 4 days ago: not responding

API key

Required

HTTPS

Supported

Browser calls

No, needs a proxy

Status

Failing · 0/100

What our checks found

Health score
0/100
Reliability
0%
Average latency
858ms

Last checked 2026-09-18. Measured independently, not self-reported by the provider.

How to call it

A starting template for What3Words. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.

# Requires an API key. Check the docs for whether it goes in a header or a query parameter.
curl -s "https://what3words.com/ENDPOINT" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json"

This API does not send CORS headers, so a browser will block a direct call from your front end. Call it from your server, or put a small proxy in front of it.

Where this listing comes from

Aggregated from one public source (public-apis), then normalised and checked by us. If something here is wrong, tell us and we will correct it.

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What3Words — common questions

Answered from what our own scheduled checks found, not from the provider's marketing.

Is What3Words free to use?

What3Words is listed in our free catalogue, but it requires an API key, so you will need to register before your first call. Providers frequently reserve higher limits and commercial use for paid plans.

Does What3Words need an API key?

Yes. What3Words authenticates with an API key. Keep it server-side rather than in browser code, because anything in your frontend bundle is readable by anyone who opens developer tools.

Can I call What3Words from browser JavaScript?

Not directly. What3Words did not return CORS headers when we checked, so the browser will block your page from reading the response even though the request itself succeeds. Call it from a server, or put a small proxy in front of it.

Is What3Words still working?

Not at our last check on 2026-09-18. What3Words did not respond successfully, which is why it is marked as down here. This may be temporary; we re-check on a schedule and the badge above reflects the most recent run.

Is What3Words available over HTTPS?

Yes. What3Words serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.