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Showing the 19,086 endpoints that answered our last unpaid knock, most recently knocked first. The catalogue holds 76,774 listings in all: 18,505 charge, 638 answered without asking, 8,860 did not reach a working endpoint, and 48,771 we have never knocked on. Type something above to search all of them.
Combined share of permanent water, herbaceous wetland and mangrove classes. The coordinate is validated against the Natural Earth boundary for Romania; results outside it are rejected before payment.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Options max pain, open interest and put/call ratio for one Deribit expiry (default: the next expiry with open interest), BTC or ETH. Market data only — not investment advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Minimal transaction status: found/not-found, success or error, slot, blockTime, fee. The cheapest tx lookup — for confirmation polling.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Outdoor activity screen for the next 3 to 12 hours: temperature, feels-like, rain, wind and UV combined into good, fair or poor.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Use when an agent needs the top x402 services tagged 'agentcash'. Returns Retired route /in-agentcash: now serves the live /in-x402 ranking, the top 25 x402 services tagged 'x402' by 30-day unique paying wallets.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Research institution profile by name: type, country, works, citations, h-index and top research topics.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
What do AI agents really pay for on x402? Demand by category or keyword, wash trading filtered, ranked by buyers.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Free-space path loss in dB from distance and frequency, plus wavelength; or the range that produces a given loss.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
EV efficiency in kWh per 100 miles, miles per kWh, Wh per km and MPGe, range from battery size, and cost versus a gas car.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
x402engine — Transaction history with asset transfers and labels for any wallet
The price is the seller’s own listing. it answered us without asking for payment, once, on the day we knocked, on 2026-10-21.
Change watch for has shopify domain verification: runs the check, compares it with the result from your previous call for the same domain (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Bulk is dns hosted by infomaniak: up to 20 domains in one call, processed concurrently, results in input order with a per-item error field and a failure count. Same answer per item as the single endpoint. Batch enrichment for agents that hold a list. $0.10 per batch.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Split an event budget by percent into exact-cent amounts that add up to the total (largest-remainder rounding).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
HTTP status code meaning, typical cause, client action and cacheability, from the IANA registry and RFC 9110.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
One earthquake by USGS event id: magnitude, depth, felt reports, PAGER alert, max intensity, tsunami flag and review status.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Elevation profile along a line between two US points: relief, ascent, descent, steepest grade and a flat/steep verdict.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Random UUID v4 — idempotency keys and x402 requestKeys on demand; canonical $0.001 target for testing x402 stacks
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
New S-1 IPO registration filings feed (metadata + links) — Rolling feed of newly filed S-1 IPO registration documents: filer, filing date, accession number, and direct EDGAR links — metadata only, no deep parse. The watch feed for agents tracking S-1 IPO registration activity.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Great-circle distance (miles, km, feet, nautical miles) and initial compass bearing between two latitude/longitude points.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Exposure value (EV) from aperture, shutter speed and ISO, the light level it suits, and equivalent aperture and shutter pairs.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Mean SoilGrids clay fraction for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Czechia; results outside it are rejected before payment.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Pay-per-call: Domain Age
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
ETH balance of any address on Base (wei + ETH). Pay-per-call via x402. An empty body is answered for the wallet that pays on Base (the payment's signer); send {"address":"0x…"} for any other address.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Letter frequencies, index of coincidence and the most likely Caesar shift of a ciphertext using English statistics.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Top holders of a NEP-141 token on NEAR with each one's share of total supply, labelled as the token itself, an issuer treasury, a contract (pool, bridge, custodian) or a plain account, so neither a pool nor unissued stock is mistaken for a whale. Holder count, shares, and LOW / MEDIUM / HIGH concentration of plain accounts over circulating supply. Supply from the NEAR RPC, holders from NearBlocks.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Initial compass bearing (0-360 degrees, clockwise from true north) from point 1 to point 2.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Human-readable transfer summary of a transaction (who sent what to whom, SOL and SPL), parsed from pre/post balances.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Bayes' theorem: posterior probability from a prior, sensitivity and false-positive rate, with natural frequencies and odds form.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Package health for npm, PyPI, Go, Maven, Cargo or NuGet: maintained, stale or abandoned, deprecation, license, adoption.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Cake servings from pan size and area per slice: round, square or rectangle, one or several tiers, wedding or party slice style.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Drywall sheets for a room's walls and ceiling (4x8, 4x10 or 4x12), with waste, screw count and approximate weight.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Past and future Earth close approaches of one asteroid or comet by designation, for example Apophis in 2029.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
One-call due diligence on a trading strategy: its record over 7/30/365 days and all time, the luck test, how it ranks in its book, overlap with its book's current top 20, the latest Merkle proof and commit-timing check. Historical only; general information, not advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Validate an ISO 3166-1, 4217 or 639 code or a ccTLD or dial code: assigned, reserved, deleted or unknown.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Property tax lookup. Search a county's open-data assessor dataset by street address or parcel ID and return parcel id, owner, assessed and market value, sqft, year built, zoning, and a permalink to the source portal. Covers NYC PLUTO, SF Assessor Roll, and Cook County (Chicago) — open-data CC0 sources. Same backend as property-tax-assessment under a more search-friendly slug.
The price is the seller’s own listing. it answered us without asking for payment, once, on the day we knocked, on 2026-10-21.
Perp premium to oracle price for a coin on Hyperliquid, in percent, with a stretched/normal verdict.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Stopping distance from speed: reaction distance plus braking distance on dry, wet, snow or ice, with road grade.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
RC filter cutoff frequency, time constant and charge times to 63%, 90% and 99% from resistance and capacitance.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Hill radius of a planet in AU and km from its mass, orbit, eccentricity and star mass, with the stable-moon region.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Rank up to 6 countries on one indicator (GDP, growth, inflation, unemployment...) with the year of each value.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Whether an HTTP method is safe and idempotent (IANA registry), what it is for, and request-body semantics.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Get current job postings for a company by Apollo organization ID.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Convert data sizes between bytes, KB/MB/GB/TB (decimal) and KiB/MiB/GiB/TiB (binary), and the time to transfer at a speed.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
How much a spender is approved to move from an owner — Genesis402 / UnyKorn Operator Network
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Paper profile by DOI: title, journal, year, citations, field-weighted impact, open-access link and retraction state.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
minia2a service: x402-loan
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
All new moons, first quarters, full moons and last quarters in a month (UTC) with times and a blue-moon flag.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
IUCN Red List category of a species (EX to LC) with its meaning and whether it counts as threatened.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Audiobook running time from a word count at about 9,300 words per hour (change it), as hours and clock time.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
A whole number as Spanish words (cardinal, ordinal 1-100), gender, un/uno apocope, long scale (mil millones, un billón).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
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.