List every legal chess move for a position given as FEN, in both SAN (Nf3) and UCI (g1f3) notation, plus turn and check/checkmate/stalemate/draw flags. Pass 'start' for the opening position. For bots playing chess, validating opponents, or teaching the rules.

Check whether a chess move is legal in a given FEN position and get the board state after it: resulting FEN, capture info, and whether the move gives check. Illegal moves return a clear verdict instead of an error, so game bots can handle bad input gracefully.

Chess position analysis from a FEN string: every legal move in SAN and UCI notation, whose turn it is, and full game-state flags — check, checkmate, stalemate, draw, insufficient material, threefold repetition. Optionally validate and apply one move to get the resulting FEN. Deterministic rules logic, not engine evaluation.

Resolve a place name to its geographic coordinates, along with country, region, population, elevation, and local timezone for the closest five matches. Built as the bridge between human-readable locations and any API that only accepts latitude/longitude — geocode once, reuse everywhere.

Geocoding API: city or place name to latitude/longitude with country, region, population, and timezone — top matches ranked. The bridge between human place names and every coordinates-based API.

The latest official space-weather notifications — coronal mass ejection alerts, geomagnetic storm warnings, solar radiation storms, and weekly summary reports — as structured JSON with type, issue time, and full text for each. Covers roughly the last 7 days by default. For infrastructure-risk agents, science newsletters, and space-weather monitoring dashboards.

Color conversion API: any hex or rgb() color to hex, RGB, and HSL plus is-it-dark detection and the accessible text color (black or white) to place on top of it. For theming, chart, and design-generation agents. Instant, computed locally.

Color format converter for hex codes and rgb() values: get back hex, RGB, and HSL representations plus a light-or-dark classification and the ideal black-or-white text color for readability on top of it. Handy for UI theming, chart palettes, and dashboard generators that need instant, exact color math without guessing at contrast ratios.

Common problems lookup for US vehicles: aggregates every owner-filed defect report into the definitive ranked list of trouble spots — transmission, airbags, brakes, electrical — with complaint counts, percentage share, and crash/fire severity totals. Built for used-car advisors and mechanic triage agents.

Financial math API: compound interest with any compounding frequency, monthly loan/mortgage payment and total interest, or ROI. Exact, deterministic.

Contrast and dark-mode checker for any hex or rgb() input: returns whether a color reads as light or dark and which text color, black or white, stays legible on top of it, alongside full hex/RGB/HSL conversions. Useful for accessible UI generation, theme switchers, and design-system tooling that can't afford a manual eyeball check.

Pull ready-to-use conversation starters framed as either/or choices — from lighthearted food debates to philosophical trade-offs — one to five at a time, filtered by topic. For community bots, Discord games, onboarding warm-ups, and any agent that needs to spark a discussion.

Audio conversion API: convert any public audio/video URL (mp4, mov, wav, ogg, m4a — up to 25MB) to MP3 on our own hardware. Returns base64 MP3. Use as an mp4-to-mp3 extractor, audio normalizer before transcription, or format bridge in media pipelines. Files deleted immediately after processing.

Cooking measurement API: convert between cups, tbsp, tsp, ml, l, fl-oz, grams, kg, oz, lb — including volume↔weight using typical densities for 40+ ingredients (flour, sugar, butter, honey, rice...). A cup of flour is 120g but a cup of honey is 340g. For recipe scaling and grocery agents. Density results labeled approximate.

Turns structured JSON arrays into spreadsheet-ready CSV, up to 10,000 rows, headers unified across objects, nested fields JSON-encoded inline, quotes escaped correctly. Useful for report generation, data exports, and any pipeline bridging an API response to a file a human opens in Excel or Sheets.

Number base converter API: convert a number between any bases from 2 to 36 (binary, octal, decimal, hexadecimal, base-36...). Exact and instant. For low-level programming, encoding, and puzzle agents.

Temperature conversion API: give a value in Celsius, Fahrenheit, Kelvin, or Rankine and get all four scales back — science-grade, exact, instant. For cooking, HVAC, chemistry, physics, and weather agents.

Timezone converter API: convert a wall-clock time from one IANA timezone to another with daylight-saving applied correctly — returns converted local time, UTC ISO, and unix epoch. 'What is 3pm Tokyo for Chicago?' deterministically. For scheduling and calendar agents.

Unit conversion API: convert between 100+ units across length, mass, volume, temperature, area, speed, pressure, energy, power, and digital storage. Exact factors, instant, local. Deterministic and auditable — cheaper than burning reasoning tokens, zero arithmetic-hallucination risk, and the result can be cited. Unknown units return a helpful 400 listing valid targets.

Cooking conversion API: cups↔grams↔tablespoons↔ml with ingredient-aware densities for 40+ ingredients (a cup of flour is 120g, a cup of honey is 340g). The kitchen math LLMs get wrong.

Computes straight-line haversine distance and compass bearing between any two latitude/longitude points, returned in km, miles, and nautical miles. Useful for geofencing checks, travel-time estimation inputs, and mapping agents working from raw coordinate pairs rather than place names.

Token and word counting API: characters, words, sentences, estimated LLM tokens, Flesch reading ease, and reading time for any text. Budgeting context windows and readability in one call.

Country reference data keyed by name or ISO code — currency, capital, languages, calling code, region, area, and neighboring countries — returned as one clean JSON object. Useful for populating currency selectors, tax jurisdiction logic, and data-enrichment pipelines without hardcoding a static country table.

Country information API: capital, ISO codes, currencies, languages, calling code, region, area, land borders, and flag emoji for any country by name or 2/3-letter code — one normalized JSON object, answered locally in milliseconds. For form localization, compliance screens, shipping rules, and data-enrichment agents.

Country facts API: capital, currencies, languages, population, region, calling code, and flag for any country by name or ISO code, as one JSON object. For forms, localization, compliance, and enrichment agents.

Crash-test results for US-market vehicles: government 5-star program scores covering frontal and side impacts, side pole, and rollover, plus safety-feature flags like electronic stability control and forward-collision warning. Query by VIN or year/make/model; unrated vehicles return a clear not-found answer.

Cron parser API: validate a cron expression and get its next 1-20 run times as ISO timestamps in any timezone. Instantly answers 'when will this fire?' for scheduler-building, automation, and DevOps agents. Invalid expressions return a clear unpaid 400.

Validates a cron expression and lists its next several scheduled run times as ISO timestamps in any timezone, so you can confirm a schedule does what it's supposed to before deploying it. For automation and DevOps agents building or auditing recurring jobs.

Parses any standard cron expression and computes its next 1-20 firing times in a chosen timezone, flagging malformed expressions clearly rather than letting a bad schedule silently fail in production. For scheduler tooling, CI pipelines, and agents that generate cron syntax and need to sanity-check it.

Returns rhyming words, sound-alikes, or commonly paired adjectives for any input word, ranked by strength of association. Useful for crossword and word-game agents, poetry generation, and naming brainstorms that need a wider candidate list than a model would produce unprompted.

Converts cooking measurements between volume units (cups, tbsp, tsp, ml, l, fl-oz) and weight units (g, kg, oz, lb), using ingredient-specific densities so a cup of flour and a cup of honey convert to their correct, different gram weights. For baking apps and recipe-scaling agents.

The official daily reference exchange rate between two major fiat currencies out of roughly 30 supported ISO codes, with the rate's effective date. Published once per business day, so it's built for invoice pricing, financial reporting, and normalization tasks rather than live trading, where a stale-by-seconds rate would be a problem. Cached 1 hour.

Currency exchange rate API: official daily reference rate for any major fiat pair (USD, EUR, GBP, JPY, ~30 ISO currencies), as JSON. A settlement/normalization reference published each business day — not a live trading feed.

Current time API: the time right now in any IANA timezone (America/Chicago, Asia/Tokyo...) — local ISO timestamp, UTC ISO, unix epoch, human-readable string, and day of week. The sanity check every scheduling, logging, and coordination agent needs. Deterministic and instant.

Current weather API by coordinates: temperature, wind, and conditions code for any latitude/longitude worldwide, plus a 3-day daily outlook. Structured JSON for travel, logistics, and planning agents.

Same-verse-for-everyone daily Bible verse API: date-seeded pick from a curated pool of well-known KJV encouragement passages. Drop it into a devotional bot, morning digest, or Discord daily-message job.

Look up the daily reference rate for any pair among roughly 30 major currencies, returned with the date it applies to. Meant for pricing pages, invoicing, and financial reporting that need a consistent official benchmark rather than a fast-moving market quote. Updated once per business day and cached for an hour.

Daily history facts API: retrieves notable historical events tied to any calendar date, each entry carrying the year, a one-line summary, and a link for further reading. Built to be called once a day as a rotating content source. Useful for calendar apps, morning-briefing bots, and educational trivia agents. Attribution required and included.

Today's Proverbs reading: day-of-month picks the chapter (1-31, matching Proverbs' 31 chapters), plus a date-seeded verse highlight from within it. Locally hosted KJV text.

Today's featured space image — title, high-resolution image URL, and a full written explanation from an astronomer — refreshed daily. A drop-in content source for newsletters, screensaver bots, and daily-content agents that want a fresh astronomy image with context every day, no image curation required.

Today's (or any past day's) featured astronomy picture — title, plain-language explanation, media type (image or video), and full-resolution URL — as structured JSON. Pass an optional date (YYYY-MM-DD) to fetch a specific day's picture back to mid-1995. For daily-digest bots, content-scheduling agents, and space-education tools.

A single King James Version verse chosen deterministically for the day — same result for every caller on that UTC date, from a curated pool of ~375 well-known comfort and encouragement passages.

Look up current conditions and the next three days of daily highs, lows, and precipitation chance for any coordinates worldwide. Useful for trip planning, outdoor-event scheduling, and any agent that needs a short-range forecast without integrating a dedicated weather provider. Cached 10 minutes for freshness and cost.

Date math API: add days to any date (returns resulting date + weekday) or count calendar days and weekday-only business days between two dates. The arithmetic agents get wrong in-context, done deterministically. For deadlines, SLAs, scheduling, and planning.

Converts a given local time between IANA timezones with daylight-saving transitions applied correctly, so a meeting scheduled across the DST changeover lands on the right hour instead of one off. Returns local time, UTC ISO, and unix epoch for downstream calendar and reminder systems.

Decode a vehicle identification number to full structured specs: make, model, year, trim, body style, engine details, transmission, drive type, and manufacturing plant as clean JSON. Accepts full 17-char VINs or partials with * wildcards. For listing enrichment, insurance quoting, and vehicle-history agents.

Get dictionary definitions for a word — all senses labeled noun/verb/adjective, with pronunciation guide and a synonym/antonym list attached. One call replaces a definition query, a thesaurus query, and a spell-check: useful for writing assistants, tutoring bots, and content pipelines.

Image description API: detailed natural-language description of any image URL — subjects, setting, actions, visible text — from our locally-hosted vision engine. Use for image understanding, content cataloging, moderation pre-screening, and vision-blind agent workflows. Images processed in memory, never stored.

Statistics API: mean, median, mode, standard deviation, variance, percentiles (p25-p99), range, sum, and IQR outliers for up to 100k numbers — exact, deterministic.

Language detection API: identify the language of any text (60+ languages) with confidence scores and top-3 candidates — computed locally in milliseconds, text never stored. For routing multilingual content, translation pre-checks, and moderation pipelines.