Keep rewards worth the same in dollars as the coin moves
Store the reward in USD, convert at claim time, and clamp the movement so a price spike cannot empty the faucet in an afternoon.
Tagged “price”
5 entries
Refuse to pay on a stale price
The guard that turns a dead price feed into a delayed payout instead of a wrong one. Fail closed, log loudly, retry later.
Take the median of several price feeds
One API returning a wrong number should not decide what you pay. Three sources and a median makes a single bad quote irrelevant.
Fetch and cache a coin price without hammering the API
One request per interval for the whole site, an atomic cache write, and a stale copy served rather than nothing when the feed is down.
Convert USD balances to coin units for a payout
If your ledger is in dollars and your payout API is in satoshi, this is the conversion, with the guard that stops a stale price from emptying your wallet.