Bitcoin halving countdown from a block height: next halving height, blocks and days remaining, estimated date, current subsidy and coins mined so far.

Western and Orthodox Easter for any year from 1583 with Ash Wednesday, Palm Sunday, Good Friday, Ascension, Pentecost and Corpus Christi dates

Balance a chemical equation with the smallest whole-number coefficients, with an atom-by-atom check and the mass balance for reactants and products

Electric vehicle range estimate from battery capacity, consumption and reserve - kilometers and miles

Canadian place geocoder from Natural Resources Canada - coordinates and bounding box for cities, towns, features and addresses across all provinces

Pilot reports near an airport - turbulence and icing intensity, flight level, aircraft type, cloud, wind and temperature, with counts of significant reports

Brazil central bank time series - Selic rate, IPCA and IGP-M inflation, USD/BRL, EUR/BRL, CDI and unemployment from Banco Central SGS

Search French companies by name, SIREN or SIRET - status, creation date, activity code, size, head office address, establishments and officers

Julian date, modified Julian date, day number, Greenwich mean sidereal time and local sidereal time for a timestamp and longitude

Video frame count and frame interval from frame rate and duration

Look up legal entities in the GLEIF LEI index by company name or LEI - status, jurisdiction, legal form, addresses, registration and renewal dates

Bitcoin mining profit from hashrate, power, electricity price, BTC price and difficulty: daily BTC, margin, breakeven price and rate, and hardware payback.

Marine species sightings from OBIS by scientific name - coordinates, depth, date, country, dataset, basis of record and taxonomic family

Historical daily or monthly weather for a NOAA station - high, low and mean temperature, rain, snow, wettest day, hottest day and heating and cooling degree days

Find NCBI GEO gene expression series by topic - accession, title, summary, organism, study type, sample count, platform and linked PubMed IDs

Chemical element facts by symbol, name or atomic number - weight, group, electron configuration, electronegativity, melting and boiling point, density

Molar mass of a chemical formula with brackets and hydrates - g/mol, Hill formula, atom counts, mass percent per element and moles from a sample in grams

Chicago reported crimes by type, ward and arrest status over a chosen number of days - incident counts by type and the most recent records with locations

ChEBI chemical entities by name - definition, formula, mass, monoisotopic mass, charge, SMILES, InChIKey and curation stars from EMBL-EBI

Dollar-cost averaging simulation on a supplied price list: average cost, units, return, breakeven price and a comparison against one lump sum at the first price.