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Showing the 23,775 endpoints that answered our last unpaid knock, most recently knocked first. The catalogue holds 91,887 listings in all: 22,941 charge, 895 answered without asking, 10,293 did not reach a working endpoint, and 57,758 we have never knocked on. Type something above to search all of them.
Domain in, a grade from A to F out: how readable a website is to AI crawlers and answer engines (robots.txt, llms.txt, sitemap, JSON-LD, MCP and x402 readiness). Public files only, no LLM. $0.05 USDC per request.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Split a length into major and minor parts by the golden ratio (or silver, root-2, custom) with matching rectangle sizes.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Screen pixel density (PPI) from resolution and diagonal, physical size, CSS viewport at a device pixel ratio, and image widths.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Spell text in the NATO phonetic alphabet (Alfa, Bravo, Charlie) or decode NATO words back to letters and digits.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Sample size for a two-sample, one-sample or paired t-test from effect size, alpha and power; or the power for a given size.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
The most-viewed Wikipedia articles on the latest published day, with views and rank, excluding the main page and special pages.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Primality test and prime factorization of integers up to 10^19, with divisor count, divisor sum, Euler totient and number type.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Primality test (deterministic Miller-Rabin below 2^64) plus the next and previous prime, with BigInt.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Modular multiplicative inverse of a mod m, or the gcd that proves none exists.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Exact age in years, months and days from a birth date as of a date, plus next birthday and days until it.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Peak UV index per day for up to 5 days at any coordinates with the WHO exposure category and protection guidance.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Convert markup to margin and back, and get the selling price, from a cost plus one of markup, margin or price.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Fastest-rising Wikipedia articles: biggest view gains against the previous week's average among each day's top 1000 pages.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Molar mass and percent composition by element for a formula, including brackets and hydrates such as CuSO4.5H2O.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Recent beacon epochs and their participation. PulseChain (chain id 369). $0.003 USDC per call.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Daily weather history for a location and date range (up to a year): temperature, rain, wind, sunlight and summary stats.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Plumbers in a US city with no website of their own — verified, chains removed, phone, address, rating and reviews. Up to 12 per page
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Grazing carrying capacity in animal unit months from acres, forage yield, use percent and days, with an optional herd check.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Convert a model year (1980-2039) to its VIN position-10 code, or a code to its two possible years.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Total hours from clock-in/out pairs with unpaid break deduction, optional rounding, per-day totals and overlap flags.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Distress screen from SEC filings: late-filing notices, auditor change, non-reliance, delisting and bankruptcy items.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Greatest common divisor, least common multiple, Bezout coefficients and modular inverse for integers of any size.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Search ICD-10-CM diagnosis codes by words in the description, with the matching codes and their chapters.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Parse a ZIP's first entry header: name, method, sizes, CRC, encryption, and zip-slip path or executable-name risks.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Score a ten-pin bowling game from its rolls: frame-by-frame totals with strike and spare bonuses, validation of illegal rolls.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Area in acres, hectares and square meters and perimeter of a polygon from lat,lon vertices, e.g. a parcel or flight area.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Snap line-heights for font sizes to a baseline grid: baseline unit, lines per element, unitless line-height and margins.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Requests per second times payload size to Mbps with peak factor, protocol overhead and link headroom; or IOPS to MB/s.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Food to prepare for a guest count by course (appetizer, main, side, salad, dessert, bread) with kid and appetite multipliers.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
The combined market regime — one read fusing the stock Fear & Greed score and velocity, VIX, insider-buying sentiment, and net liquidity into a named regime (e.g. Mixed Signals) with severity and a suggested stance, plus how the S&P 500 historically performed after similar regimes (forward 5/22-day and 1/3-month returns and win rates). From x402stock, a market & economic data API (x402, USDC).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Drinks for an event from a first-hour and later-hours rule per guest, split into beer, wine and liquor, with bottle counts.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Circular orbit speed, escape speed and period at an altitude or radius around the Sun, a planet, the Moon or a custom mass.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Pounds and bags of ice for a guest count from a per-guest rule, with hot-weather multiplier and extra for chilling drinks.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Email address screen: syntax, whether its domain accepts mail (MX), role account and known disposable domain flags.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Has this paper been retracted, corrected or flagged? Notices from Crossref and Retraction Watch for a DOI.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
x402 Doctor: is a URL a valid agent-payable paid resource? v1+v2 spec check with grade and verdict
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
The next upcoming public holidays in a country within the coming year, with days until each.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Validate a 17-character vehicle VIN check digit and decode region, manufacturer code and model-year candidates.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Flash guide-number maths: range for an aperture and ISO, or the aperture needed for a distance, in metres and feet.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Convert between linear amplitude and dBFS, and get the RMS level and crest factor of a sine, square, triangle or sawtooth.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Pressure altitude from field elevation and altimeter setting (inHg or hPa), exact ISA result and the 1000 ft per inHg rule.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Spell a scale or mode on any root: major, minor, modes, harmonic and melodic minor, pentatonic, blues, whole tone.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Returns a JSON array of NHL team standings with wins, losses, and points
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Bitcoin fee rates for next-block to economy confirmation, mempool congestion level and the cost of a typical transaction.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Trip fuel and cost for legs with different mileage (city, highway), tank range, refuel stops, cost per person and a second car.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Gallons of paint for a room from its size, doors, windows and coats; optional ceiling. Rounds up to the quart.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Stair layout from total rise: number of risers, exact riser height, total run, stringer length, angle and a code check.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Monthly rainfall totals for a location, wettest and driest months, and how seasonal the rain is (Walsh-Lawler index).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Search SEC EDGAR filings (?q=)
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
Convert a value between units of length, mass, volume, area, speed, pressure, energy, power, time or temperature, exactly.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-25.
The description and the price are the SELLER’S, copied from their listing and not checked by us. The badge is OURS and is one unpaid handshake: “answered unpaid” means it answered us once without asking for payment, which is not a standing offer, and an unpriced listing is unpriced rather than free.
Knocking goes to the knock page, which reads the terms live before anything is signed. A listing can be out of date in both directions, which is the reason to knock rather than to read a row.