General Utilities x402 offerings

True-random-number generator API. Generates a bounded random number via one of: int, float, binary, octal, hex, bigInt (returned as a string), romanNumeral. Accepts optional locale (default en_US). N…

Gas mileage savings calculator. Compares annual fuel cost between two gas-powered vehicles based on miles driven, gas price, and each vehicle's MPG, and computes the break-even point for any price pr…

Slug generator API. Converts any text into a clean, URL-safe slug (lowercase, hyphen-separated, unicode-aware), handling punctuation and accented-character edge cases a naive regex misses.

Checksummed-identifier-format generator API. Generates a structurally valid isbn, upc, vin, or imei, each computed with its real check-digit algorithm. vin and imei take no arguments. Accepts optiona…

Base64 encoder API. Encodes UTF-8 text to base64 instantly and correctly — skip burning agent tokens hand-computing base64, which LLMs frequently get wrong on padding and edge cases.

Electric car savings calculator. Compares annual electricity cost against annual gas cost for a comparable gas vehicle, accounting for free-charging usage, and computes break-even years, cost per ful…

Unit conversion for length, mass, volume, and temperature using exact conversion factors (temperature uses the correct affine formulas, not simple multiplication).

A Quality Gate For Prompts. Before they break production. Score any AI prompt against 8 dimensions, see what's weak, and get the fixed version in seconds.

Top Polymarket wallets over a 7d or 30d window, ranked by EDGE, not by raw win rate. Win rate is computed from RESOLVED markets only (a trade wins when its side matches the final resolution), but ranking a wallet by win rate alone rewards backing favourites — winning a bet the market prices at 0.99 shows no skill. So wallets are ordered by edge_lower_bound = (Wilson-95%-lower-bound of win_rate) − avg_entry_price: how far the wallet beat the price it paid, damped so a tiny perfect record can't top a large one. Final ranking is by conviction_score = edge_lower_bound × ln(1 + total_volume_usd), scaling proven edge by the capital behind it (a real edge on $200k outranks the same edge on $6k), with log diminishing returns so size alone can't buy the top. Rankable wallets need >= 10 trades AND >= $1000 total volume in the window (a skin-in-the-game floor — cent-sized longshot bets otherwise manufacture a real-looking edge) plus at least one decided trade. Each entry: address, Predge score (0-100 or null), win_rate, avg_entry_price, edge, win_rate_lower_bound, edge_lower_bound, conviction_score, decided_trades, trades_count, total_volume_usd, avg_position_usd. Honest degradation: {"insufficient_data": true, "reason": ...} when the dataset is too young. Query params: window (7d|30d, default 30d), limit (1-100, default 50).

Paid premises-licence preflight. Evidence-first deterministic UK premises-licence decision with official-source freshness guards. Payment verification precedes business execution. Not licensing-autho…

Price impact for an Arc token: what buying and selling $10, $100 and $1,000 would really get, each quoted by the Uniswap v4 Quoter on the token's deepest USDC pool (simulated, nothing spent). Pass ?token=0x.... Returns the mid price, the pool and its fee, and for each size the tokens or USDC out, the effective price and the cost or loss against the mid price (fee and impact included). A pool whose hook refuses quotes, no USDC pool or a failed read is refused before payment.

Analyzes why procrastination happens and identifies likely underlying causes.

Subtracts exported energy from supplied site energy, divides by conditioned floor area and selects the first caller-supplied ascending maximum-intensity band. It does not normalize climate or occupan…

Public holidays for a country and year from an open public-holiday dataset (keyless, 100+ countries): date, local name, English name, nationwide flag, and holiday types. Pairs with /api/business-days and /api/country-info.

Public and bank holidays for 200+ countries and their regions (states, cantons) for any year, with local names. Optionally check whether a given date is a holiday. Params: country (ISO 3166-1 alpha-2, required, e.g. DE, US, CH, JP), region (e.g. BY, CA, ZH), year (default current), date (YYYY-MM-DD to check), language (e.g. en), include_observances (default false).

Official public holidays for any of 110+ countries and a given year: date, English and local name, nationwide flag and holiday type. For scheduling, logistics, payroll and commerce agents planning around non-working days worldwide.

Official public holidays of 150+ countries and their regions (Spanish autonomous communities, US states, German Länder...) for a year, whether a given date is a holiday, and the next holiday.

Public holidays in Algeria for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public-holiday dataset. Business-day and scheduling checks for Algeria without an API key. $0.01 per year.

Public holidays in Andorra for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public-holiday dataset. Business-day and scheduling checks for Andorra without an API key. $0.01 per year.

Public holidays in Argentina for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public holiday dataset. Business-day and scheduling checks for Argentina without an API key. $0.01 per year.

Public holidays in Australia for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public holiday dataset. Business-day and scheduling checks for Australia without an API key. $0.01 per year.

Public holidays in Austria for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public holiday dataset. Business-day and scheduling checks for Austria without an API key. $0.01 per year.

Public holidays in Belarus for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public-holiday dataset. Business-day and scheduling checks for Belarus without an API key. $0.01 per year.

Public holidays in Belgium for a given year: every national and regional public holiday with date, local and English names, whether it is nationwide or which regions observe it, and the weekday, from the Nager.Date public holiday dataset. Business-day and scheduling checks for Belgium without an API key. $0.01 per year.