Every agent-payable API.

IP address classifier and formatter - IPv4 or IPv6 type (private, loopback, link-local, multicast, global), integer, expanded and compressed forms

Profit margin and markup calculator - margin percent, markup percent and profit from cost and price, or the price for a target margin

Regex tester - matches, capture groups and named groups for a JavaScript pattern against text

Descriptive statistics for a list of numbers - mean, median, mode, standard deviation, quartiles and percentiles

Loan amortization schedule calculator - monthly payment, total interest, payoff time and first 12 payments, with savings from an extra monthly payment

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

Age calculator from birthdate - exact age in years, months and days, total days lived and days until the next birthday

JSON validator - checks whether text is valid JSON, with type, size, depth, key count and error line and column

Percentage calculator - percent change between two numbers, percent of a number, what percent one number is of another, and increase or decrease by a percentage

Compound interest calculator - final balance, interest earned and year-by-year growth for a principal, rate, years and optional monthly contribution

HTML escape and unescape - convert special characters to HTML entities and back

Lorem ipsum generator - repeatable placeholder paragraphs with a chosen number of sentences and seed

Days between two dates calculator - total days, weeks, years-months-days and business days between any two dates

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

UN Sustainable Development Goal indicators for a country - latest values and trends

Dew point, wet-bulb, absolute humidity and condensation check

Dictionary: Definitions, Examples, Pronunciation. English dictionary: definitions by part of speech with usage examples (Wiktionary), pronunciation, syllable count and word frequency; spelling suggestions when a word is not found.

Thesaurus: Synonyms, Antonyms, Rhymes & More. Thesaurus and word finder: synonyms, antonyms, rhymes, near rhymes, sound-alikes, homophones, means-like, adjectives for a noun, broader/narrower terms, with parts of speech and frequency (Datamuse).

EU public procurement tender search (TED) - title, buyer, CPV codes, publication date and deadline

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

Geocode a street address or landmark to latitude and longitude - up to five ranked results with country, region and type (OpenStreetMap)

Radon potential for a U.S. address or coordinates (USGS and EPA) - low, moderate or high with screening range

Superfund sites near an address or coordinates (EPA NPL) - status, distance, hazard score and cleanup dates

Snowpack near a western U.S. or Alaska location (SNOTEL) - snow water equivalent, depth and percent of median

FDA food recall search (openFDA) - product, reason, firm, classification and status

FDA medical device recall search (openFDA) - product, reason, firm, classification and status

FDA drug recall search (openFDA) - product, reason, firm, classification and status

Film Facts: director, cast, release, runtime, box office (Wikidata). Film facts from Wikidata: release date, runtime, directors, writers, cast, genres, countries, language, composer, producers, studios, box office, budget, IMDb and Wikipedia links; disambiguate with year.

Final exam score-needed calculator from current score, target and exam weight

Solunar fishing and hunting forecast - moon phase, illumination and major and minor activity windows

Packaged food lookup by UPC or EAN barcode - name, brand, ingredients, allergens, Nutri-Score and nutrition facts

Fossil taxon lookup (Paleobiology Database) - classification, occurrences and geological age range

Freight class hint from weight and dimensions - volume, density and NMFC density class

Fundraising dilution calculator - post-money valuation and investor and holder ownership after the round

Fundraising dilution calculator - post-money valuation and investor and holder ownership after the round

GPA calculator from grade-point and credit-hour arrays - quality points, credits and GPA

GS1 SSCC-18 logistics-unit validator - check digit, payload and serial reference

Planting window dates from local frost dates and crop maturity - indoor start, transplant and harvest

Weekly EIA retail fuel prices - regular and premium gasoline and diesel, national or by area

Genealogy lookup for a notable person - birth and death, parents, spouses, children and siblings (Wikidata)

Grammar & Spelling Check (30+ languages). Grammar, spelling and style check in 30+ languages (auto-detected): each issue with message, category, position and suggested replacements, plus a corrected version of the text. Powered by LanguageTool.

Grant fit score - eligible-cost ceiling, required cash match, match gap and request-to-budget risk

Great-circle midpoint between two coordinates - latitude and longitude

Great-circle (Haversine) distance between two coordinates in kilometers and miles

MCP Server Builder and Auditor. A structured method for building or auditing an MCP server: inventory every tool's data access, side effects, cost, and reversibility; design unique action-object names with strict JSON Schema (required fields, enums, bounds); enforce authorization server-side from authenticated identity rather than tool arguments; require confirmation and idempotency keys for consequential actions; return bounded, sanitized, provenance-carrying output; and test through a real…

Getting Started with the ESP32 Microcontroller. An orientation to the ESP32 for developers coming from Arduino: why its 240 MHz dual-core CPU and built-in WiFi/BLE matter, how to set up the Arduino IDE or ESP-IDF toolchain, and the critical 3.3V-logic, FreeRTOS dual-core, and OTA-update differences to understand before wiring one up.

Website Launch Preflight. A launch candidate that passes functional, mobile, accessibility, metadata, security-header, form, analytics, performance, and recovery checks on the actual production hostname before traffic is sent to it.

Docker Container Failure Resolver. A reproducible container build and run whose image, command, environment, mounts, user, network, health, and persistent data are understood, with the failure isolated without deleting valuable volumes.

Lead Source, Consent, and Suppression. A lead record and enforcement pipeline that distinguishes public availability from permission to contact, verifies identity and source, applies channel/jurisdiction policy, blocks suppressed recipients at send time, and audits corrections and deletion.

Entity Resolution and Deduplication. A versioned matching system that separates exact identifiers from probabilistic similarity, preserves source records, explains merge decisions, supports review and unmerge, and measures false merges and missed matches by risk slice.