The Overround / Contact
One address, read by a person.
A number that looks wrong. This is the one we want most. Send the page and what you think it should say, and if you are right it goes on the corrections page with the date.
A market we should cover. We price roughly two thousand and publish pages for the ones with real money behind them. If we are missing an obvious one, say so.
Venues and data providers. We link to where a bet is cheapest. That is not for sale, and it is not a reason not to talk.
Journalists. We compute what each venue charges to trade every market we cover, which as far as we can tell nobody else publishes. If that is useful for something you are writing, ask and you will get the current figures with a timestamp attached.
One person runs this. Replies take a day or two, and pitches for link placement get no reply at all, because position on this site is not for sale.