Crypto slippage - what a USD trade size costs on the Coinbase, Kraken, Bitstamp and Gemini order books, with spread, average fill price, slippage percent and best venue to buy or sell

Speed converter - convert between mph, km/h, m/s, knots and ft/s with all equivalents

Area converter - convert between acres, hectares, square meters, square feet and square kilometers with all equivalents

Kimchi premium - Upbit KRW price vs global USD price for a coin, with premium percent adjusted for the live USDT/USD rate, implied KRW per USD and 24h change

Crypto price on a past date - USD price of up to 5 coins on any day since 2013 with change and multiple versus today

JSON to CSV converter - turns an array of objects or arrays into CSV with proper quoting

Temperature converter - convert between Celsius, Fahrenheit and Kelvin with all three equivalents

Author profile - birth and death dates, top work, work count, subjects, bio and alternate names from Open Library

CSV to JSON converter - parses quoted CSV with a chosen delimiter and header row into an array of objects

DEX volume - top decentralized exchanges by 24h trading volume on any chain with 7d, 30d totals and change percent

Crypto options open interest and max pain - Deribit BTC, ETH, SOL or XRP put/call ratio, top strikes with USD open interest and distance from spot, ATM implied volatility and max pain by expiry

Crypto price across exchanges - bid, ask, last and 24h USD volume on Kraken, Coinbase, Gemini, Bitstamp, Bitfinex, Gate.io, KuCoin and MEXC, USDT books converted to USD, with best bid/ask, cross-exchange gap and premium vs median

Perp funding rate - current funding for a coin on OKX, Bitget, Gate.io, Hyperliquid, dYdX and Deribit, normalised to 8h and annualized with the long/short bias

Weight converter - convert between pounds, kilograms, ounces, grams, stone and tons with all equivalents

French company register lookup - search Sirene by name or SIREN for legal form, activity code, status, address, headcount band and revenue

CFPB consumer complaint search by company or topic - product, issue, company response and narrative from the US federal complaint database

Ethereum Layer 2 ranking - L2BEAT total value secured, share, 7-day change, stage, category and stack for Base, Arbitrum, Optimism and 90+ rollups

US economy snapshot - fed funds, CPI and core inflation, unemployment, payrolls, GDP, mortgage rate, Treasury yields, VIX, oil and jobless claims with changes and year-over-year

Crypto hacks and exploits - DefiLlama database of 1,300 incidents with amount lost, chain, technique, classification and totals by year, filterable by chain

DeFi protocol fees - top protocols by 24h fees or revenue on any chain with 7d and 30d totals, category filter and change percent