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The highest price an asset has ever reached.
Pick a coin, an amount, and a date you didn't buy — estimate what that decision could have cost you. Painful, but useful.
Choose a platform and make your own decision. Crypto is risky — never invest more than you can afford to lose.
Compare an exchange →Prices flow through our own caching proxy (Netlify function → CoinGecko), with a fallback to a direct call and then to demo data if everything else is unavailable. The source is always shown on the receipt.
Games, insights and your personal crypto history.
Live prices come from CoinGecko, through our own caching proxy. If the live API is briefly unavailable, the calculator falls back to an approximate historical dataset for a handful of major coins — clearly marked "OFFLINE DEMO DATA" right on the receipt, so you always know which one you're looking at.
No. CryptoFumble is for fun and reflection, not investment advice. It shows a hypothetical outcome based on historical prices — not a prediction or a recommendation. Crypto is volatile and you can lose money. Always do your own research before investing.
That means the live CoinGecko API was temporarily unreachable (rate limits, a network hiccup), so the receipt used an approximate backup dataset instead of exact historical prices. It only covers BTC, ETH, SOL, DOGE, ADA, XRP and BNB — for any other coin, if live data fails you'll see an error instead of a wrong number.
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