Does this work for the whole world?
Yes. Open-Meteo covers the entire globe on a free keyless forecast, so any of the fifty cities on the list works, from Accra to Auckland.
Public tool
Will the midday sun be kind today?
Pick a city anywhere on Earth. Sun Gate reads today's peak UV from Open-Meteo's free world forecast, sorts it into the WHO sun bands, then asks the live AffixIO API for a signed yes or no.
- No API key
- Open data from Open-Meteo
- Signed with ML-DSA-65
Where are you checking?
Pick a city. Fifty places across every continent are on the list.
Today's peak UV
AffixIO proof
- Proof
- Answer
- Audit
- Policy
- Signed
- Algorithm
- Digest
- Signature
Stamped by the live AffixIO API and signed with ML-DSA-65, the FIPS 204 post-quantum algorithm. Nothing personal goes into the payload.
How to use it
Three moves, no sign-up.
Pick a city
Fifty places across every continent are on the list, from Accra to Auckland.
Press Run the check
The page fetches today's peak UV from Open-Meteo's free world forecast.
Read the verdict
You get the WHO sun band, the number behind it, and a signed proof from the live AffixIO API.
What you are looking at
The UV index is the international scale for the strength of the sun's ultraviolet radiation at the Earth's surface. The World Health Organisation sorts it into bands: 0 to 2 is low, 3 to 5 is moderate, 6 to 7 is high, 8 to 10 is very high, and 11 or above is extreme.
A YES verdict means the peak UV today sits below 8, so a normal day outside is fine with the usual care. A NO verdict means the peak is 8 or above, so the advice is to stay in the shade around midday and cover up.
The proof card shows the answer stamped by the live AffixIO API: a proof id, an audit id, the policy version, and an ML-DSA-65 signature over the payload digest. That is the same post-quantum signature family the production platform uses.
Questions
Do I need an API key?
No. The weather data is free and open. The signed verdict uses a throwaway demo key that the page requests from the live AffixIO API on its own. You never type a key and the page never holds a site key.
Is this a full weather forecast?
No. It answers one question about the strength of today's midday sun. For rain, wind and the week ahead, use a full forecast service.
What does the proof card show?
The answer stamped by the live AffixIO API: a proof id, an audit id, the policy version, and an ML-DSA-65 signature over the payload digest. That is the same post-quantum signature family the production platform uses.