Credits buy conditioning, feed and cosmetics — the same credits for all three, so there is no second currency hiding the exchange rate. Every formula they feed into is published.
If your bird takes a division, the dollars you fed to win it are shown — on the front page until the next bell, and in the archive for good. Everyone else’s feed is sealed until the bell; after it, the card publishes every bird’s fight power, from which feed can be worked out. If you would rather that number never appeared next to your brand, this is the moment to know it — not after you win.
This is the rate at the moment you pay and it will not change afterwards. Credits have no monetary value and cannot be cashed out, traded or refunded into money. If your bird wins a division, the amount you fed becomes public — the front page until the next bell, the archive for good.