Methodology

Mid-market conversion rates

Pair pages prefer CoinGecko simple/price and related chart endpoints with roughly 60-second server revalidation and shared in-memory caching. Crypto-to-fiat uses the coin’s quote currency; fiat-to-crypto inverts; crypto-to-crypto uses available vs_currency quotes; fiat-to-fiat bridges via bitcoin.

When CoinGecko rate-limits or errors, CryptonicTools falls back in order to FreeCryptoAPI (when a server FREECRYPTOAPI_KEY is configured), then CoinLore (spot USD, with open FX multipliers for major fiats), then Binance public REST tickers/klines for major USDT pairs. The UI labels the active source. Fallback indexes are still informational — not guaranteed fills.

Displayed rates are mid-market or public venue indexes. They are not bid/ask on your exchange, bank wire rate, or P2P advert. Stablecoins (including USDT) use the same approach — not a guarantee of $1 redemption.

Fee-aware profit

Invested = buy price × quantity × (1 + buy fee %). Proceeds = sell price × quantity × (1 − sell fee %). P&L = proceeds − invested. ROI = P&L / invested. Break-even sell approximates invested / (quantity × (1 − sell fee %)). Fold gas or deposit costs into the fee fields when they matter. Math runs in your browser.

Gas bands

Ethereum prefers Etherscan gasoracle when a key is configured, otherwise Blockscout. Other chains use public RPC eth_gasPrice with simple low/high bands. Treat results as triage, then simulate in your wallet.

DCA and historical prices

DCA and lump-sum vs DCA simulations buy on calendar candles from CoinGecko market_chart/range when available. If that feed rate-limits, majors fall back to Binance public klines (USDT ≈ USD). Historical price prefers CoinGecko history for a calendar date, then Binance daily close for mapped majors. Past simulated ROI is not a promise of future results.

DeFi and risk estimates

Liquidation, LTV, impermanent loss, funding, and similar tools use transparent simplified models. They will not match every venue’s insurance fund, mark price, or concentrated-liquidity curve. Confirm on the protocol or exchange you use.

Sentiment

Fear & Greed displays Alternative.me’s published index and recent history. CryptonicTools does not recompute their underlying formula.