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Showing the 23,394 endpoints that answered our last unpaid knock, most recently knocked first. The catalogue holds 90,752 listings in all: 22,573 charge, 880 answered without asking, 10,014 did not reach a working endpoint, and 57,285 we have never knocked on. Type something above to search all of them.
2:3 pulldown cadence: which film frames land in which video fields and frames when 24 fps film is telecined.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Cubic metres (CBM) and cubic feet of cartons, air volumetric weight (1:6000) and sea chargeable volume.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Bitcoin price in USD, EUR, GBP, CAD, CHF, AUD and JPY, with optional conversion of an amount of BTC, sats or fiat.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Compose 2D or 3D rotate, scale and translate steps into one homogeneous matrix, optionally applied to a point.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Edits per day on a Wikipedia article over 30 days, with protection status: a signal of how contested the topic is.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Convert a date and time from one IANA time zone to another, flagging times that do not exist or occur twice at DST changes.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Countries where a species has been recorded with record counts, and the recent five-year reporting trend.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Hyperliquid coins with the most tracked notional within N% of liquidation (longs and shorts) and confirmed liquidations in the last 24h. Market data only — not investment advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Decode an IUCN Red List code (EX, EW, CR, EN, VU, NT, LC, DD, NE) into its category, meaning and threatened flag.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Parse a scientific name into genus, species epithet, subspecies or variety, authorship and year, and check capitalisation.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Hold exposure constant: change one setting (aperture, shutter or ISO) and get the other two compensations, in stops.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Convert fuel economy between US mpg, UK mpg, km per litre and litres per 100 km, with optional trip fuel and cost.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
How many identical boxes fit inside a larger box or crate: best of six orientations in a simple grid, with utilization.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Board feet for lumber from thickness, width, length and quantity (nominal sizes), with total cost at a price per board foot.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Eigenvalues and eigenvectors of a 2x2 matrix (closed form) or a symmetric matrix up to 10x10 (Jacobi).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Wavelength and half-wave dipole, quarter-wave vertical and full-wave loop lengths for a frequency, with velocity factor.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Years to double money at a growth rate (exact and by the rule of 72), and how long inflation takes to halve buying power.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
List current OSI-approved SPDX licenses, optionally only FSF-libre ones or those starting with a prefix.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Search the SPDX license list by name or id fragment, such as gpl or creative commons, with OSI and deprecated flags.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Verify a citation: does the DOI exist, does its real title match the claimed title, and has it been retracted?
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Baker's percentages and hydration from a gram formula, counting sourdough starter, with scaling to a flour or dough weight.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
True airspeed, Mach and equivalent airspeed from calibrated airspeed, pressure altitude and outside air temperature.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Concrete for a slab: cubic yards with waste, ready-mix order size and the number of 40, 60 or 80 lb bags of mix.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Validate an SPDX license expression (AND, OR, WITH, +): syntax, known ids, known exceptions and deprecated identifiers.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Correlation, beta, R-squared and alpha of one return or price series against another you supply. Not advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Count business days between two dates, skipping weekends and your holiday list, NETWORKDAYS style.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Wallet Portfolio: Get a complete wallet portfolio for an Ethereum address: native ETH balance, ERC-20 balances, NFT holdings, recent transfers. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_portfolio.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Compound annual growth rate from start and end values over years, or dates, or periods. Arithmetic on your numbers, not advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Convert an ISO 3166-1 country code between alpha-2, alpha-3 and numeric; also name, currency, ccTLD, calling code.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Journal profile by name: output, citations, h-index, open-access status, DOAJ listing, article fee and quality flags.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Day length, sunrise, sunset (UTC) and solar noon for a latitude, longitude and date, including polar day and night.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Returns a JSON object with the caller IP address as a string
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
List a website's URLs from its sitemaps. Reads robots.txt and sitemap indexes (gzip supported) and returns up to 2000 URLs with lastmod dates.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Planetary Kp index over the last 3-168 hours: latest, peak, trend and the NOAA G storm level it maps to.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Solve x = a1 (mod m1), x = a2 (mod m2), ... with the Chinese remainder theorem, coprime or not.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Country demographics: population, 10-year population growth, life expectancy and internet use, with an ageing/growing verdict.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Solve ax^2 + bx + c = 0: real or complex roots, discriminant, vertex, axis of symmetry and factored form.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Vet a directory, publication or sponsor pitch before paying: domain age (RDAP), Tranco rank, Google News presence, outbound-link dilution, badge and pay-to-play signals, score 0-100 with red flags
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
MRR, ARR, customer lifetime, annualised churn and LTV from customers, ARPU and monthly churn, with optional CAC payback.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Split a tax-inclusive price into net and tax, or add tax to a net price, for a sales tax or VAT rate you supply.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Generate a CSS clamp() that scales a size linearly between a min and max viewport width, in rem, with the exact slope.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Prediction market search — find Polymarket events by free text and get each event's status, dates, volume, liquidity, topic tags and its markets with current YES prices. Use to locate a market on an election, Fed decision, crypto price, geopolitical or AI question before pulling odds, history or the order book.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Chance of a run: r successes in a row (or r identical outcomes) somewhere in n independent trials, like coin flips.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Levenshtein and Damerau-Levenshtein edit distance (restricted and unrestricted) between two texts, with a 0 to 1 similarity.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Cubic yards and approximate tons of gravel, sand, topsoil, mulch or compost to cover an area at a given depth.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Koppen-Geiger climate class (such as Cfa or BSk) for a location, computed from its monthly temperature and rainfall normals.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
GDP growth record of a country over 5-30 years: average, worst and best year, recession years and volatility.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Page metadata: title, description, Open Graph, Twitter card, JSON-LD. All metadata of a web page: title, description, language, canonical URL, favicon, Open Graph, Twitter card and JSON-LD structured data.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Is a US point inside a mapped wetland? National Wetlands Inventory type and size, as a permitting heads-up.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
Long weekends in a year for a country, with length in days and the bridge days that would extend them.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-24.
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.