Which currencies are covered?
Thirty, the ones the European Central Bank publishes reference rates for.
Public tool
What does that cost in my money?
Type an amount and pick two of the thirty currencies the European Central Bank publishes. Currency Gate converts at the official reference rate from the free Frankfurter API, checks your budget if you set one, then asks the live AffixIO API for a signed yes or no.
- No API key
- Open ECB rates from Frankfurter
- Signed with ML-DSA-65
What are you converting?
Type an amount, pick the currency it is in and the currency you want. A budget is optional.
Conversion
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.
Type an amount and pick two currencies
Thirty currencies are on the list, the ones the European Central Bank publishes reference rates for. A budget is optional.
Press Run the check
The page converts at the official ECB reference rate from the free Frankfurter API and, if you set a budget, checks the result against it.
Read the verdict
With a budget, a YES means the converted amount fits and a NO means it is over. Without a budget, you get the conversion and the rate date, with a signed proof from the live AffixIO API.
What you are looking at
The European Central Bank publishes reference rates for around thirty currencies each working day. Frankfurter is a free open wrapper for those rates.
With a budget set, a YES verdict means the converted amount fits inside it and shows the remainder. A NO verdict means it is over and shows the shortfall. Without a budget, you get the conversion and the rate date.
These are official reference rates, not live market rates, and they do not include any fees a bank or card might add. The proof card shows the answer stamped by the live AffixIO API with an ML-DSA-65 signature.
Questions
Do I need an API key?
No. The rates are free and open. The signed verdict uses a throwaway demo key that the page requests from the live AffixIO API on its own.
Are these live market rates?
No. They are the official ECB reference rates published each working day. They do not include any fees a bank or card might add.
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.