The Ex-Numis web site tells us that it will cost 5 Swiss francs (about US$5) to submit a coin image to the service. Then, if provenance is found in the company's database of coin records there will be an additional fee of 25 or 50 francs to learn what the provenance is.
New subscribers to the service can get a 25 franc credit.
I would be curious to know if any readers of this blog have tried the service and what their results have been?
Ex-Numis claims to have a database of nearly one million coin records. For comparison, the free search tool acsearch.info claims to have 2.8 million records. The subscription-bsed CoinAchives.com claims to have 'millions'. Both of these sites focus on recent sales. The American Numismatic Society's photo file, which predates the Internet, has 600,000 records.