Reference for spelling out numbers in English with ordinal and cardinal forms.

Convert between any number bases (2-36), learn about numeral systems, and see powers tables.

Convert any number to English words — including currency and ordinals.

Convert numbers to English words — up to 999 trillion, with currency and ordinal formats.

Convert numbers to written words in cardinal, ordinal, currency and year formats — built for finance agents

Fascinating facts about specific numbers plus prime checking and perfect square detection for any integer.

Format, convert, analyze and generate numbers. Currency, Roman numerals, statistics, math and more.

Get interesting trivia, math, and date facts for any number via Numbers API.

Calculate numerical integration using quadrature methods

Assess numerical stability of algorithms and computations

Numerology calculations: life path, expression numbers, compatibility and name analysis.

Numerology calculations with life path numbers, compatibility and predictions

Calculate life path, destiny, soul urge, and personality numbers from name and birthdate.

Numerology Guide data API with random, search, and bulk endpoints.

Coin and currency database: historical coinage, mint marks, grading standards, valuation guides and auction records.

Calculate soil nutrient balances from input and removal data

Score soil nutrient cycling efficiency from indicator data

Score food nutrient density per calorie

Score nutrient removal system performance from effluent data

Interpret soil nutrient sensor readings for fertilizer decisions

Search USDA food database for nutrition facts — calories, protein, fat, carbs, vitamins.

Nutrition database with 2M+ foods: macros, micronutrients, glycemic index, ORAC score, allergen flags, portion calculato

Macronutrient guide (protein/carbs/fat/fiber) and 5 key vitamins with RDAs and sources.

Look up nutritional data for 8 common foods — calories, protein, carbs, fat, fiber and micronutrients. Built for AI health agents.

Assess and plan nutrition coaching with actionable recommendations

Nutrition Data Intel API — intelligence and analytics for AI agents.

Look up nutritional information for 300,000+ foods with macros, vitamins and minerals

Analyze and score with Nutrition Deficiency Screener API — structured JSON output.

Score food nutritional density relative to calorie content

Complete nutrition facts panel data for any food item

Extract and normalize nutrition facts, ingredient lists, allergen declarations, and serving size data from food product

Calorie, macro, and nutrient data for common foods with serving scaling

Calorie, macro, and nutrient data for common foods with serving scaling

Score workplace nutrition intervention quality metrics

Nutrition Science API — intelligence and analytics for AI agents.

Score population nutritional status from survey indicators

Nuts Guide data API — search, random, bulk endpoints.

NZBN Validator

Guide to OAuth 2.0 flows: Authorization Code, PKCE, and Client Credentials.

OAuth 2.0 guide — authorization code, client credentials and PKCE flows explained. Built for AI developer agents.

Guide for OAuth 2.0 flows — Authorization Code, PKCE, Client Credentials, Device Code.

Analyze OAuth scope sets for least privilege violations — detect critical, high, and overly broad scopes.

Minimize OAuth scopes from user action, data class, tool purpose, consent need, and revocation risk

Parse and describe OAuth scope strings by provider

OAuth Scope Validator

OAuth State Parameter Generator

Inspect and decode OAuth JWT tokens

OAuth URL Builder

Score video object detection accuracy from mAP metrics

Deep merge multiple JSON objects with overwrite, concat or keep-original strategies.