Airlines Reference
Airline lookup by IATA or ICAO code, callsign, country and flight number parsing from the OpenFlights snapshot.
/airline-callsign$0.02/airline-lookup$0.02/airline-route-between$0.02
Small, sharp APIs for AI agents. Pay a few cents per call.
148 shelves, 1298 endpoints. Each answer is a computed verdict with the reasons, the source, and what was not checked. Pay in USDC over x402: no account, no signup, no API key.
148shelves
1298endpoints
$0.02+per call
Airports Reference
Airport lookup, nearest airports, distances, runways and hubs from OurAirports open data.
/airport-code-convert$0.02/airport-distance$0.02/airport-lookup$0.02
Algebra and Geometry Solvers
Quadratic and cubic roots, triangle solver, shape areas and volumes, linear systems, matrices, vectors, trig, complex numbers, series, coordinate geometry.
/complex-ops$0.02/coordinate-geometry$0.02/cubic-solve$0.02
Audio Calc
Audio engineering maths for agents: sample rates, bit depth, bitrates, dB sums, SPL, LUFS, latency, tuning ratios and room modes.
/bit-depth$0.02/bitrate-size$0.02/buffer-latency$0.02
Automotive Calculators
Car math for agents: tire size and speedometer error, gearing and RPM, trip fuel, EV efficiency, towing, depreciation, lease versus buy, engines and braking.
/acceleration-estimate$0.02/depreciation$0.02/engine-calc$0.02
Aviation Calculators
Pilot math from your own numbers: pressure and density altitude, ISA, true airspeed, wind components, wind triangle, fuel and time, glide and turns.
/density-altitude$0.02/fuel-time-distance$0.02/glide-ratio$0.02
Aviation Weather
Airport weather decoded into flight categories, forecast deterioration, crosswind, density altitude and SIGMET hazards.
/airport-conditions$0.03/crosswind$0.02/density-altitude$0.02
Bank and Tax ID Validators
Validate IBAN, BIC, card number, US routing, EU VAT and US EIN formats and check digits.
/aba-routing-check$0.02/bic-parse$0.02/card-check$0.02
Barcodes and QR Codes
Generate QR, Code 128 and EAN-13 SVG barcodes, QR capacity, check digits and Wi-Fi or vCard payloads.
/barcode-check-digit$0.02/code128-svg$0.02/ean13-svg$0.02
Bicycle Gearing & Fit Calc
Gear ratios and speed, cadence, gear tables, chain length, wheel circumference, climb grades, saddle height and frame size.
/cadence-for-speed$0.02/chain-length$0.02/climb-gradient$0.02
Bitcoin Network
Fee estimates, address and transaction status, network health, mining pools, supply and price from mempool.space.
/btc-address-check$0.03/btc-address-validate$0.02/btc-fee-estimate$0.03
Books and Libraries
Book lookup by ISBN, book and author search, author works, subject lists, reading time and citation formatting from Open Library.
/author-search$0.02/author-works$0.03/book-by-isbn$0.02
Calendar Systems
Date conversion and calendar facts for agents: Julian Day, Julian, Hebrew, Islamic tabular and Persian calendars, Chinese zodiac, moon phases and seasons.
/age-profile$0.02/chinese-zodiac$0.02/day-of-week$0.02
Cheap Utilities
Tiny deterministic helpers for agents: JSON repair and diff, cron and semver, hashes, contrast, URL, email, IP and timestamp checks, text stats.
/color-contrast$0.02/cron-explain$0.02/email-syntax$0.02
Chemistry Calculators
Periodic table lookup, molar mass from formulas, mole conversions, dilution, pH, ideal gas, limiting reagent, empirical formula, bond polarity, half-life.
/bond-polarity$0.02/dilution$0.02/element-lookup$0.02
Chess Notation Tools
FEN validation and parsing, square maths, empty-board piece moves, material count, PGN tag parsing and time-control categories.
/fen-board$0.02/fen-parse$0.02/material-count$0.02
Chinese Calendar and Culture
Solar terms, lunar dates, BaZi pillars, I Ching hexagrams, hanzi pinyin and simplified/traditional conversion.
/bazi$0.03/hanzi-info$0.02/i-ching$0.02
Classic Ciphers and Encodings
Caesar, Vigenere, Playfair, rail fence, Morse, NATO, Braille, Base32/58/64 and frequency analysis for puzzles and learning.
/braille$0.02/encode-text$0.02/frequency-analysis$0.02
Color and Design Tools
Exact color conversion, accessible text colors, palettes, mixing, color-blindness simulation and contrast fixes.
/accessible-text-color$0.02/color-adjust$0.02/color-blind-sim$0.02
Company Enrichment
Company profiles, filings, 8-K red flags, insider trades, financials and legal-entity data from SEC EDGAR and GLEIF.
/company-snapshot$0.05/lei-lookup$0.02/lei-parents$0.03
Construction Calculators
Materials and layout maths for concrete, paint, stairs, roofs, lumber, tile, drywall, fences and decks.
/board-feet$0.02/bulk-material$0.02/concrete-volume$0.02
Cooking Calculators
Kitchen math for agents: recipe scaling, safe temperatures, ovens, baker's percentages, yeast, eggs, pans, brine, ABV and coffee.
/abv-gravity$0.02/bakers-percentages$0.02/brine-salt$0.02
Country and Currency Codes
ISO 3166 countries, ISO 4217 currencies, ISO 639 languages, calling codes and TLDs as an offline reference.
/calling-code$0.02/code-convert$0.02/code-lookup$0.02
Country Facts
Borders, driving side, time zones, land routes and comparisons for 250 countries and territories.
/border-path$0.02/borders$0.02/countries-filter$0.02
Craft & Maker Calc
Cross-stitch size, quilt binding, knitting gauge, half-square triangles, candle wax, resin volume, stitch counts and decal scaling.
/candle-wax$0.02/cross-stitch-size$0.02/decal-scale$0.02
Crypto Math
Modular arithmetic, primality, CRT, curve parameters, RSA sizing, encodings, entropy and check digits.
/check-digits$0.02/crt$0.02/ec-params$0.02
CSS Design Calc
CSS and layout maths for agents: unit conversion, fluid clamp(), type scales, aspect ratios, grids, specificity and readability.
/aspect-ratio$0.02/box-size$0.02/clamp-fluid$0.02
DeFi Intelligence
DeFi yields, protocol TVL moves, stablecoin pegs, hacks and fees computed from DefiLlama public data.
/defi-chain-tvl$0.02/defi-fees-top$0.02/defi-hacks-recent$0.02
Dev Reference
Developer reference lookups for agents: HTTP status codes, headers, CSP and Cache-Control explainers, MIME types, ports, DNS record types, ISO 8601 and Unicode.
/cache-control-explain$0.02/csp-explain$0.02/datetime-convert$0.02
Developer Utilities
JWT decoding, iCalendar builder, breached-password check, certificate transparency, cron schedules, regex tester, user-agent parser.
/cert-transparency$0.02/cron-next-runs$0.02/ics-event$0.02
Dictionary and Etymology
English word definitions, pronunciation, etymology, inflections and translations from Wiktionary.
/compare-words$0.03/define$0.02/etymology$0.02
Domain and DNS Checks
DNS records, email authentication, DNSSEC, CAA, registration data and email address checks.
/caa-check$0.02/dns-records$0.03/dnssec-check$0.03
Electrical Calculators
Voltage drop, three-phase power, power factor correction, transformer sizing, wire resistance, energy cost, AC impedance and battery banks.
/battery-bank$0.02/energy-cost$0.02/ohms-law-ac$0.02
Electronics Calculators
Ohm's law, resistor codes and standard values, dividers, LED resistors, RC filters, battery runtime, wire gauge, decibels, 555 timers, power cost.
/battery-runtime$0.02/decibels$0.02/led-resistor$0.02
Emoji Tools
Emoji search, info, skin tones, flags, text analysis and shortcodes from Unicode emoji data.
/emoji-analyze-text$0.03/emoji-flag$0.02/emoji-group$0.02
Environment Screen
Air quality, pollen, AQI conversion and EPA toxics-release facility screens for a place.
/air-quality-history$0.03/air-quality-now$0.02/aqi-category$0.02
EVM Chains Read-Only
Live read-only facts from public RPCs for Ethereum, Base, Arbitrum, Optimism and Polygon.
/evm-address-kind$0.02/evm-block$0.02/evm-chain-facts$0.02
Farm & Garden Calc
Growing degree days, ET0, plant counts, fertilizer maths, lime, irrigation time, feed and stocking arithmetic.
/et0-hargreaves$0.02/feed-ration$0.02/fertilizer-rate$0.02
File Format Inspector
Identify and inspect files from their first bytes: magic numbers, PNG, JPEG, GIF, WebP, ZIP, gzip and PDF headers.
/extension-vs-content$0.02/gif-header$0.02/gzip-header$0.02
Finance Calculators
Exact loan, savings, growth, break-even and cash-flow calculations for agents, with no model guesswork.
/break-even$0.02/compound-interest$0.02/loan-payment$0.02
Fitness and Body Calculators
BMI, ideal weight, calorie needs, macros, one-rep max, heart-rate zones, race pace and prediction, body fat, calorie burn, due date.
/bmi$0.02/bmr-tdee$0.02/body-fat-navy$0.02
Focus & Sleep Planner
Sleep-cycle bedtimes, caffeine decay, Pomodoro and nap schedules, sleep tally, jet-lag shifts and time blocks.
/caffeine-decay$0.02/jet-lag-shift$0.02/nap-planner$0.02
Food Barcode Facts
Packaged food lookup by barcode: nutrition, allergens, diet fit, additives, comparison, daily values.
/additive-info$0.02/food-additives$0.02/food-allergens$0.02
FX Rates ECB
Currency rates, conversion, history, volatility and movers from European Central Bank reference rates.
/fx-basket$0.02/fx-change$0.02/fx-convert$0.02
Garden Calculators
Garden math for agents: growing degree days, plant spacing, bed soil, drip irrigation, fertilizer, compost balance, frost risk and planting dates.
/compost-cn-ratio$0.02/drip-irrigation$0.02/fertilizer-rate$0.02
Geo Calc
Coordinate math for agents: geohash, Plus Codes, UTM and MGRS, geodesics, bounding boxes, polygon area and coordinate formats.
/bbox-radius$0.02/coord-format$0.02/geodesic-direct$0.02
Global Hazards
Worldwide earthquakes, storms, volcanoes and other natural hazard events from keyless public feeds, plus quake and seismic-wave calculators.
/active-storms$0.03/active-volcanoes$0.03/hazard-events-near$0.03
Global Weather
Worldwide forecasts for any coordinates: now, daily, rain, wind, UV and outdoor conditions, plus heat index, wind chill and dew point.
/dew-point$0.02/forecast-daily$0.02/forecast-now$0.02
Grades & Study Calc
Grade needed on a final, weighted grades, GPA, percent to letter, curves, percentile rank, reading plans and study time.
/final-grade-needed$0.02/gpa$0.02/grade-curve$0.02
Graph Algorithms
Shortest paths, spanning trees, topological order, components, max flow, graph statistics and all-pairs distances from a caller-supplied edge list.
/all-pairs-shortest$0.03/bellman-ford$0.02/connected-components$0.02
Hacker News
Hacker News stories, search, threads, users, domain stats and trending topics.
/hn-domain-stats$0.02/hn-front-page-date$0.03/hn-item$0.02
Home Energy Calculators
Home energy math for agents: bills, appliance loads, solar sizing, heat loss, HVAC load checks, insulation, water heating, EV charging and fuel cost.
/bill-estimate$0.02/ev-charging$0.02/heat-loss$0.02
HVAC Airflow & Load Calc
Airflow heat load, air changes, duct sizing, velocity, fan laws, efficiency conversions and mixed-air temperature.
/air-changes$0.02/duct-equivalent$0.02/duct-velocity$0.02
Hydrology & Open-Channel Calc
Manning flow, normal and critical depth, Froude number, weir flow, rational method, time of concentration and orifice flow.
/critical-depth$0.02/froude-number$0.02/manning-flow$0.02
Identifier Validators
Check digits and structure for ISBN, UPC/EAN, VIN, ISSN, ORCID, ISIN, CUSIP, LEI and MAC addresses.
/cusip-check$0.02/gtin-check$0.02/isbn-check$0.02
Industry and Occupation Codes
NAICS 2022 industry codes and SOC 2018 occupation codes: lookup, search, hierarchy and industry-occupation links from Census and BLS.
/code-crosswalk-hint$0.03/code-validate$0.02/naics-children$0.02
International Address Formats
Postal address formats, postal-code validation and subdivisions for about 240 countries from a bundled Google i18n snapshot.
/address-format$0.02/address-parse-hints$0.02/country-address-fields$0.02
Investing Math
Position sizing, drawdowns, Sharpe, DCA, dividends, FIRE and option payoffs for trading bots and planners.
/dca-vs-lump$0.02/dividend-math$0.02/drawdown-recovery$0.02
Jewelry Maker Calc
Ring size conversion, bead counts, necklace and bracelet lengths, metal weight, carat estimates, karat alloy mixing and melt value.
/bead-count$0.02/bracelet-size$0.02/diamond-weight$0.02
JSON and Data Tools
Validate, format, diff, query and convert JSON, CSV, encodings and hashes.
/csv-parse$0.02/encode-decode$0.02/hash-text$0.02
Land Survey Screening
Elevation, slope, flood zone and wetlands screening for any US coordinate, plus distance, area and sun-time helpers.
/distance-bearing$0.02/elevation-profile$0.03/elevation$0.02
License Intel
Look up, search, parse and compare open-source licenses from the SPDX list and plain-language rules.
/deprecated-check$0.02/license-compare$0.02/license-exception$0.02
Life Dates & Milestones
Exact age, next birthday, 1,000-day milestones, weekday of any date, zodiac signs, birthstones and generations.
/age-detail$0.02/birthstone-flower$0.02/date-countdown$0.02
Linear Algebra
Matrix multiply, determinant, inverse, rank, linear solve, eigenvalues, vector ops, least squares and transforms.
/determinant$0.02/eigen$0.02/inverse$0.02
LLM Cost & Capacity Calc
Token estimates, API cost, prompt-cache savings, batch discounts, context fit, rate-limit planning and model comparison from your own prices.
/batch-discount$0.02/cache-savings$0.02/context-fit$0.02
LLM Model Intelligence
Compare AI model prices, context and capabilities, estimate costs, and check open-model licenses and activity.
/hf-license-check$0.02/hf-model$0.02/hf-trending$0.02
Locale and Formatting Tools
Locale-aware number, currency, date, plural, relative-time, list and sort formatting from the ICU/CLDR data built into the server.
/format-currency$0.02/format-date$0.02/format-number$0.02
Machine Learning Metrics
Classification, ranking, regression, calibration and text-generation metrics computed exactly from arrays you send.
/bleu-rouge$0.02/calibration$0.02/confusion-matrix$0.02
Machining & Fasteners Calc
Spindle speeds, feeds, metal removal, tap drills, thread geometry, bolt torque and sheet-metal bends.
/bend-allowance$0.02/bolt-torque$0.02/cut-time$0.02
Map Tile Maths
Web Mercator and slippy-map tile maths: tile numbers, bounds, quadkeys, ground resolution, zoom for an extent, tile counts and scale.
/ground-resolution$0.02/mercator-project$0.02/quadkey$0.02
Marine Conditions
Tide predictions, water level and surge, buoy observations, nearest stations, Beaufort and sea state.
/buoy-now$0.02/nearest-buoy$0.02/nearest-tide-station$0.02
Market and Holiday Calendar
NYSE trading calendar, early closes, option expirations, trading days, and public holidays for 100 countries.
/is-holiday$0.02/long-weekends$0.02/market-holidays-us$0.02
Markup and Text Extraction Tools
Turn HTML and Markdown you supply into text, links, headings, tables, metadata and main-content extracts.
/html-headings$0.02/html-links$0.02/html-meta$0.02
Math and Statistics
Descriptive statistics, correlation, probability distributions, confidence intervals, t-tests, A/B tests, sample sizes, combinatorics and number theory.
/ab-test$0.02/combinatorics$0.02/confidence-interval$0.02
Medical Codes and Drug Names
Look up ICD-10-CM diagnosis codes, HCPCS, LOINC lab codes and RxNorm drug names, plus code format checks.
/drug-name-match$0.03/drug-profile$0.05/hcpcs-lookup$0.02
Music Production Calc
Studio arithmetic: tempo grids, song length, tap tempo, key shifts and capo, Camelot mixing, diatonic chords, fretboard notes, pitch-speed and delay tails.
/camelot-key$0.02/delay-tail$0.02/diatonic-chords$0.02
Music Theory
Notes, frequencies, intervals, scales, chords, keys, transposition, tempo math and Roman numeral analysis.
/chord-name$0.02/chord$0.02/freq-note$0.02
NASA Exoplanets
Confirmed exoplanets from the NASA Exoplanet Archive: planet and star lookups, habitable-zone screens, discovery stats, nearest planets and calculators.
/discovery-stats$0.03/earth-comparison$0.02/equilibrium-temperature$0.02
NASA Media Library
Search NASA's Image and Video Library: photos, video and audio with dates, centers, rights fields and asset files.
/apollo-photo-search$0.02/mars-media$0.02/nasa-asset$0.02
Network Calc
Network engineering maths for agents: subnetting, IPv6 formats, CIDR aggregation, bandwidth, TCP windows, MTU and VoIP.
/cidr-aggregate$0.02/cidr-compare$0.02/cidr-ipv6$0.02
Network Intel
Who runs an IP or ASN, is a route valid, abuse contacts, routing visibility, CIDR math.
/abuse-contact$0.02/asn-profile$0.03/cidr-calc$0.02
Number Words
Numbers to words and back: English, Spanish, French, German, Roman numerals, cheque amounts, years and ordinals.
/cheque-words$0.02/english-parse$0.02/english-words$0.02
Package Health
Open-source package health: activity, abandonment, deprecation, license class, dependency weight and build provenance.
/npm-downloads$0.02/package-deps$0.02/package-health$0.03
Package Registries
Health checks for Rust crates, Ruby gems, PHP packages, NuGet, Go modules, Homebrew formulae and Docker images, plus SPDX license classification.
/brew-formula$0.02/crate-health$0.03/docker-image-health$0.03
Paper & Print Calc
ISO and US paper sizes, print pixels at a dpi, sheet fitting, paper weight, envelope fit, typographic units and book signatures.
/book-signatures$0.02/envelope-fit$0.02/iso-paper$0.02
Party & Event Planner
Food, drinks, ice, seating, timeline, bill split, pizza, cake and budget rule-of-thumb arithmetic for events.
/bill-split$0.02/budget-split$0.02/cake-servings$0.02
Perp Derivatives Signals
Crypto perpetual futures funding, open interest, basis, liquidity and crowding signals.
/funding-extremes$0.02/funding-history$0.02/funding-spread$0.02
Pet Care Calc
Pet energy needs, food portions, dog age conversions, aquarium volume and weight, water changes and feeding schedules.
/aquarium-volume$0.02/daily-energy$0.02/dog-age$0.02
Phone Number Tools
Parse, validate and format phone numbers worldwide from bundled libphonenumber metadata, with no dependency.
/country-calling-codes$0.02/phone-compare$0.02/phone-example$0.02
Photography Calculators
Exposure value and trades, depth of field, field of view, crop factor, ND filters, handheld and star-trail rules, print size, sunny 16, flash and time-lapse.
/crop-factor$0.02/depth-of-field$0.02/exposure-trade$0.02
Physics Calculators
Exact physics formulas for agents: kinematics, projectiles, inclines, collisions, orbits, oscillators, waves, optics, relativity and blackbody radiation.
/blackbody$0.02/collision-1d$0.02/incline$0.02
Places Near You (OpenStreetMap)
Nearby shops, health, fuel, EV charging and transit from OpenStreetMap, with distance and bearing.
/area-summary$0.03/category-count$0.02/ev-charging-near$0.02
Plumbing & Pipe Flow Calc
Pipe volume, flow velocity, Hazen-Williams pressure loss, pipe sizing by velocity, thermal expansion, drain slope, tank fill time and bucket flow tests.
/bucket-test$0.02/drain-slope$0.02/flow-velocity$0.02
Portfolio Stats
Return, risk and drawdown statistics computed on a price or return series that you supply.
/cagr$0.02/correlation-beta$0.02/equity-curve$0.02
Prediction Market Signals
Prediction market odds, liquidity quality, event coherence and cross-venue gaps from Polymarket and Kalshi public data.
/kalshi-event$0.02/kalshi-market$0.02/pm-event-overround$0.02
Pricing Math
Markup and margin, break-even, discount stacking, tiers, price rounding, bundles, MRR and fee-inclusive pricing.
/break-even$0.02/bundle-price$0.02/discount-stack$0.02
Probability Calculators
Dice, card and lottery odds, multinomials, expected value, exact distribution tables, gambler's ruin, Bayes and streaks.
/bayes$0.02/birthday-problem$0.02/card-odds$0.02
Public Domain Books
Search Project Gutenberg's free books by title, author, topic and language, with download links.
/author-books$0.02/book-by-id$0.02/book-search$0.02
Publishing Calc
Self-publishing arithmetic: page counts, reading and audiobook time, spine and cover size, trim sizes, royalties and ebook size.
/audiobook-length$0.02/chapter-balance$0.02/cover-size$0.02
Puzzle Solvers
Bounded solvers and checkers for sudoku, N-queens, Tower of Hanoi, magic squares, Game of Life, sliding puzzles and knight's tours.
/game-of-life$0.02/knights-tour-check$0.02/magic-square$0.02
Radio & RF Calc
Maidenhead grid squares, path loss, link budgets, Fresnel zones, antenna length, SWR, dBm conversion, Morse and phonetic spelling.
/dbm-convert$0.02/dipole-length$0.02/fresnel-zone$0.02
Recurrence Rules (RRULE)
Expand, parse, build and describe iCalendar RRULE recurrences, plus weekday and business-day patterns.
/business-recurrence$0.03/next-occurrence$0.02/nth-weekday-of-month$0.02
Research Paper Checks
Verify citations, catch retracted papers, and profile papers, authors, journals and institutions from Crossref and OpenAlex.
/author-profile$0.02/citation-verify$0.02/doi-metadata$0.02
RSS and Atom Feed Reader
Read, search, validate, merge and discover RSS 1.0, RSS 2.0 and Atom 1.0 feeds and podcast episode lists.
/feed-discover$0.04/feed-info$0.03/feed-items$0.03
Satellite Catalog
CelesTrak satellite search, orbital elements, orbit classification and decay screens.
/decay-risk$0.03/ground-track-period$0.02/group-summary$0.03
Scripture Lookup
Public-domain Bible verses and passages, verse of the day, book table and reference parser.
/book-info$0.02/compare-translations$0.03/passage$0.02
SEC Filing Search
Full-text search of SEC filings, recent IPO and going-concern filings, ticker lookup and filing URL tools.
/filing-search$0.02/filing-url$0.02/form-type$0.02
Security Math
Password entropy, crack-time ranges, NIST key sizes, collision odds, Bloom filter sizing, checksums and Shamir threshold maths.
/birthday-collision$0.02/bloom-filter$0.02/checksum$0.02
Shipping & Logistics Calc
Dimensional weight, CBM, box and pallet packing, container load, landed cost and unit-price maths.
/box-packing$0.02/cbm$0.02/container-load$0.02
Site Climate
Solar, wind, rainfall and temperature normals for any coordinates, plus daylength, altitude effects and Koppen class.
/altitude-effects$0.03/climate-compare$0.05/climate-normals$0.02
Solana RPC Read-Only
Live read-only facts from Solana mainnet's public RPC: slot, balances, accounts, tokens and fees.
/sol-account-kind$0.02/sol-address-check$0.02/sol-balance$0.02
Space Objects
Asteroids, comets, close approaches, fireballs and impact-risk lookups from NASA JPL, plus asteroid size, orbit and impact-scale calculators.
/asteroid-size$0.02/body-approaches$0.02/close-approaches$0.02
Space Weather
Solar flares, geomagnetic storms, aurora chances and radio and GPS impact from NOAA's Space Weather Prediction Center.
/aurora-chance$0.02/geomagnetic-forecast$0.02/geomagnetic-kp$0.02
Species and Biodiversity
Species name matching, taxonomy, conservation status, ranges and nearby wildlife sightings from GBIF.
/iucn-code$0.02/iucn-status$0.03/scientific-name-parse$0.02
Sports Calculators
Ratings, sabermetrics, handicaps, odds, brackets and scoring for sports bots and fantasy tools.
/baseball-stats$0.02/basketball-stats$0.02/betting-odds$0.02
Star Catalog
Look up bright and nearby stars, cone searches, constellations, distances, luminosity and visibility by latitude.
/brightest-stars$0.02/constellation-info$0.02/nearest-stars$0.02
Statistical Tests
Chi-square, ANOVA, Mann-Whitney, Fisher exact, binomial and paired t-tests, multiple-comparison corrections, effect sizes, power and normality.
/anova-oneway$0.02/binomial-test$0.02/chi-square-test$0.02
Structural and Beam Calculators
Closed-form beam, section, column, stress, bolt and torsion formulas with typical material values, in SI or US units.
/beam-deflection$0.02/beam-reactions-moments$0.02/bolt-shear-bearing$0.02
Sun, Moon and Planets
Sun and Moon position, rise and set, twilight, planets, equation of time and eclipse checks.
/eclipse-check$0.02/equation-of-time$0.02/moon-position$0.02
Systems Capacity Calculators
Big-O growth, RAID capacity, storage growth, latency and throughput budgets, Little's law, queueing, Erlang and SLA downtime.
/big-o$0.02/capacity-planning$0.02/erlang-staffing$0.02
Text Analysis Tools
Readability formulas, language guess, keywords, text similarity and diff, case conversion, SMS and tweet length limits.
/case-convert$0.02/keyword-extract$0.02/language-guess$0.02
Text Similarity
String and text comparison: edit distance, Jaro-Winkler, LCS, n-gram, cosine, Soundex, Metaphone, diff and fuzzy ranking.
/cosine-tokens$0.02/edit-distance$0.02/fuzzy-rank$0.02
Thermodynamics and Heat Transfer
Ideal gas processes, Carnot efficiency and COP, conduction, convection and radiation, heat exchangers, mixing, water vapor pressure and thermal expansion.
/carnot-efficiency$0.02/conduction-heat-transfer$0.03/convection-radiation$0.02
Time Series Calculators
Moving averages, exponential smoothing, autocorrelation, outliers, decomposition, growth rates, change points and forecast accuracy for a list of numbers.
/autocorrelation$0.02/change-points$0.03/exponential-smoothing$0.03
Time Zones and Dates
Exact time zone conversion, DST transitions, meeting overlap, business days, date differences and ISO weeks.
/age-calc$0.02/business-days$0.02/date-diff$0.02
Token Safety Checks
On-chain safety facts about Base tokens, wallets and approvals, read straight from the chain.
/base-address-type$0.02/base-network-status$0.02/base-proxy-check$0.02
Trade and Customs Reference
Harmonized System codes, Incoterms 2020 rules and UN/LOCODE ports and trade locations for trade and customs work.
/hs-chapter$0.02/hs-lookup$0.02/hs-search$0.02
UK Open Data
UK postcodes, police crime data and bank holidays from free government sources.
/bank-holidays$0.02/crime-near$0.03/next-bank-holiday$0.02
Unicode Text Safety Tools
Hidden-character, bidi, confusable, script-mix, normalization and grapheme checks for text an agent is about to trust.
/bidi-check$0.02/confusables$0.02/grapheme-count$0.02
Units and Conversions
Exact unit, cooking, fuel, data-size, duration, number and base conversions, plus heat index and wind chill.
/base-convert$0.02/cooking-convert$0.02/data-size$0.02
URL & Text Tools
URL parsing, RFC 3986 resolution, normalization, percent-encoding, punycode, slugs and tracking-parameter cleanup.
/percent-encode$0.02/punycode$0.02/query-string$0.02
US Counties and FIPS
County FIPS codes, names, areas, populations, centroids and density from US Census Bureau data.
/counties-by-population$0.02/counties-in-state$0.02/county-density$0.02
US Geography
Geocode US addresses, reverse geocode, districts, metro areas, ZIP lookup, state FIPS and GEOID parsing.
/coord-distance$0.02/geocode-address$0.02/geoid-parse$0.02
US Tax Calculators
Federal income tax, FICA, capital gains, deduction and retirement-limit estimates from IRS published figures.
/bracket-lookup$0.02/capital-gains-tax$0.03/income-tax-estimate$0.03
US Treasury Macro
US national debt, Treasury yield curve, average interest rates, interest expense and Treasury exchange rates from US Treasury data.
/treasury-fx-rate$0.02/us-avg-interest-rates$0.02/us-debt$0.02
Vehicle VIN Toolkit
Decode and validate VINs, look up manufacturers, makes and models from NHTSA vPIC, plus pure VIN structure tools.
/makes-by-type$0.02/manufacturer-wmis$0.02/model-year-code$0.02
Video & Timecode Calc
SMPTE timecode including drop-frame, shutter angle, slow motion, 2:3 pulldown, frame rates, resolution and bitrate maths.
/frame-rate-info$0.02/pulldown-32$0.02/resolution-info$0.02
Vulnerability Intelligence
Known vulnerabilities, exploited-in-the-wild status and exploit probability for software packages and CVEs.
/epss-score$0.02/kev-check$0.02/kev-recent$0.02
Web Page Extract
Fetch a public web page and get clean Markdown, text, links, metadata, headings, tables and structured data.
/page-diff$0.05/page-headings$0.03/page-links$0.03
Web Probe
Redirect trace, security headers, robots.txt, sitemap, TLS expiry, timing and meta tags for a URL you name.
/http-timing$0.02/meta-tags$0.02/redirect-trace$0.02
Web3 Tools
Check and decode crypto addresses, hashes, selectors and units without a node.
/btc-address$0.02/caip-parse$0.02/calldata-split$0.02
Wikidata Facts
Entities, country, city and person profiles, identifier lookups and same-as links from Wikidata.
/country-profile$0.04/entity-facts$0.03/entity-search$0.03
Wikipedia Attention
What the world is reading: page views, trending pages, comparisons, edit activity, summaries, search and on-this-day events.
/on-this-day$0.02/page-compare$0.05/page-edit-activity$0.03
Word Tools
Rhymes, synonyms, patterns, collocations and word-game scoring for writers and agents.
/anagram-check$0.02/autocomplete$0.02/collocations$0.02
Work Time Calc
Business days, working hours, durations, overtime, timesheets, pay periods, ISO weeks and tenure arithmetic.
/add-business-days$0.02/business-days$0.02/duration$0.02
World Bank Country Data
Country economic and social indicators compared, trended and screened from World Bank open data.
/country-compare$0.03/country-profile$0.03/country-search$0.02
World Cities
World cities of 15,000+ people: lookup, search, nearby, largest, time zones, distance and comparison from GeoNames.
/cities-near-point$0.02/city-compare$0.03/city-distance$0.02
x402 Market Intelligence
Who sells what on x402, at what price, with what real traction, and whether an endpoint is payable and listable.
/x402-competition$0.02/x402-directory-stats$0.02/x402-payability$0.02
How to pay
Call any endpoint. Without payment you get HTTP 402 with the exact price and instructions. An x402 client pays and retries for you:
import { wrapFetchWithPayment } from "@x402/fetch";
const pay = wrapFetchWithPayment(fetch, client); // client = your x402 wallet client
const r = await pay("https://sec-search.x402tookit.com/ticker-cik?id=MSFT");
console.log(await r.json());
For agents and directories
catalog.json · llms.txt · sitemap.xml · /.well-known/x402. Every shelf also serves /openapi.json, /llms.txt and /catalog. Listed in the Coinbase x402 Bazaar.
Answers are screening signals computed from the sources named in each response, not professional advice. Generated 2026-10-21.