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Showing the 19,441 endpoints that answered our last unpaid knock, most recently knocked first. The catalogue holds 76,774 listings in all: 18,846 charge, 652 answered without asking, 8,901 did not reach a working endpoint, and 48,375 we have never knocked on. Type something above to search all of them.
Validate an ORCID iD (researcher identifier) with its ISO 7064 check character and give the canonical form.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
List the vehicle models NHTSA records for a make in a given model year, optionally filtered by vehicle type.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Solar panel output calculator - annual and monthly kWh for a PV system at any lat/lon from PVGIS, with optimal tilt, specific yield and irradiation
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Live MLB analysis for the San Diego franchise: roster, injuries, matchups, betting lines, player props and situational trends.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Current weather for New York (temperature, humidity, wind, conditions) — Open-Meteo source, city geocoding included
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Plants and seeds needed for an area from row and in-row spacing (grid or triangular), with germination allowance.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Encode latitude/longitude as a geohash (1 to 12 characters) with the cell bounds, center and size in meters.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Earthquakes within a radius of any coordinate worldwide: nearest, largest, counts by size and depth class, with distances.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Top-earning x402 services by 30-day volume with wash trading removed: shared payouts, twin metrics, one-buyer farms.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
N-P-K analysis of a dry fertilizer blend from components given as analysis:weight, plus elemental P and K.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Monthly average temperature, rainfall, humidity and wind for any coordinates, with hottest, coldest and wettest months.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Compare multiple provider outputs, measure exact agreement and expose field-level consensus before an autonomous workflow trusts a result.
Unpriced in the listing, which is not the same as free. it answered us without asking for payment, once, on the day we knocked, on 2026-10-21.
Package objective, completed work, pending work, blockers, artifacts and state into a compact hashed handoff capsule so another agent can continue without replaying the whole conversation.
Unpriced in the listing, which is not the same as free. it answered us without asking for payment, once, on the day we knocked, on 2026-10-21.
Get historical OHLCV candlestick data for a market
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Fetch trading activity (merges, splits, redeems) for a user
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Fetch historical orderbook snapshots for an Opinion market
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Bilinear surface elevation from Copernicus DEM GLO-30. The coordinate is validated against the Natural Earth boundary for Estonia; 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.
Relative runoff tendency derived from slope and ruggedness. The coordinate is validated against the Natural Earth boundary for Estonia; 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.
Positive difference between the neighborhood mean and center elevation. The coordinate is validated against the Natural Earth boundary for Estonia; 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.
Returns information about a block by block number. Includes block hash, timestamp, transactions, gas used, etc. Query: block (a block number, or 'latest').
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Share of ESA WorldCover 2021 pixels classified as grassland. The coordinate is validated against the Natural Earth boundary for Belgium; 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.
Dominant ESA WorldCover 2021 class in the analysis area. The coordinate is validated against the Natural Earth boundary for Netherlands; 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.
Returns the bytecode of a contract at a given address on Ethereum mainnet via eth_getCode RPC call. Query: address (0x + 40 hex).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Returns the Ether balance of a given address on the Ethereum mainnet, as of the latest block. This is a direct RPC call to eth_getBalance with the address parameter. Query: address (0x + 40 hex).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Bilinear surface elevation from Copernicus DEM GLO-30. The coordinate is validated against the Natural Earth boundary for Belgium; 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.
Audit an HTTP response you captured against a contract you declare: expected status or status class, required and forbidden headers, header value rules, and a body schema. Header names compare case-insensitively. You supply the response, so this works against an API behind authentication or on a private network.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
US ground stops and ground delay programs from FAA: airports with active ground stops or ground delays, reasons and average delay. Key for flight disruption monitoring. 全美地面停飞与地面延误：受影响机场及原因、平均延误。地上停止プログラム。Programas de retraso en tierra. 지상 정지 프로그램. Accepts payment on Base or Solana — either network works.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Xynaptic AI Insurance — the insurance vertical agent: coverage families, ORIAS broker registry, premium decomposition + an LLM synthesis of your question. POST { question, type?, broker_name?, orias? }. Legal information (France).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Xynaptic AI Industry — the industry vertical agent: live commodities, industrial market profile, supplier risk + an LLM synthesis. POST { question, sector?, siren? }. Real-time.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Real-time flight status by flight number: live departure/arrival times, delay minutes, gate, terminal, baggage belt, runway, aircraft, codeshare. 航班实时动态查询：起飞到达时刻、延误、登机口、航站楼、行李转盘。航空便フライト運航状況：遅延・ゲート・ターミナル。Estado de vuelo en tiempo real: retraso, puerta. 항공편 실시간 운항 상태: 지연, 게이트. Query: ?flight=AA100 Accepts payment on Base or Solana — either network works.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
US airport status from FAA: all airports currently with closures, ground stops, ground delays or arrival delays, with reasons and times. Official FAA NAS status data. 全美机场状态（FAA官方）：当前关闭、地面停飞、延误的机场及原因。米国空港運航状況。Estado de aeropuertos de EEUU. 미국 공항 운영 상태. Accepts payment on Base or Solana — either network works.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Xynaptic AI Health — the health vertical agent: official drug labels (openFDA), live health press + an LLM synthesis. POST { question, drug? }. Informational only — not medical advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Get ETH, USDC and up to ten ERC-20 balances of one address in a single call, human-readable. ETH plus USDC plus up to ten ERC-20 balances of one address in a single call, decimals resolved, amounts human-readable. Base mainnet. Query: ?address=0x…&tokens=0x…,0x…
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Get an ERC-20 allowance with the owner's balance and a sufficiency verdict for the amount you plan to pull. ERC-20 allowance of a spender on an owner (USDC by default), with the owner's balance and, if you pass ?amount=, a verdict: i…
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
See the USDC an address received and sent on Base, with x402 settlements identified. ERC-20 transfers of an address on Base, incoming and outgoing, with the x402 settlements identified by their EIP-3009 method. Totals, distinct senders, last settlement time. Default token is USDC. Data from Blockscout, first page, truncation declared. Query: ?address=&token=
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Decode EVM calldata (transaction input) with the function signature or, if omitted, by looking up the selector on 4byte; or decode return data with its output types (e.g. uint256,address).
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Look up UK beneficial ownership (UBO / PSC) information for a company. Returns individuals who ultimately own or control the entity, their ownership percentage, and the ownership chain. Uses Companies House Persons of Significant Control. UK-only — non-GB…
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Look up Belgian company data from the KBO/BCE Crossroads Bank for Enterprises via the CBEAPI.be JSON wrapper. Accepts enterprise number (10 digits, e.g. 0404.616.494), VAT-prefixed form (BE0404170701), or fuzzy company name. Returns name, status, juridica…
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Fetch a URL and return content as base64. Useful for embedding images, PDFs in API calls. Returns base64, content type, data URI.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Recommended Bitcoin fees in sat/vB (fastest, 30 minutes, 1 hour, economy, minimum), the mempool's size and count, and what a typical 140 vB transaction costs in BTC and USD. Source: mempool.space; USD from Coinbase spot. Cached 30 seconds. Information only, not financial advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
A Bitcoin mainnet address: confirmed and unconfirmed balance in BTC and USD, transaction count, funded and spent totals, and its last 10 transactions with the net change for the address. Mainnet bech32 and legacy addresses only. Source: mempool.space. Information only, not financial advice.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Book lookup by ISBN (checked before the call) or by title and/or author: title, subtitle, authors, publishers, first publish year, median page count, ISBN-10 and ISBN-13 of the matching edition, languages, subjects, cover image URL, and the Open Library work and Wikidata ids. Data from Open Library (CC0). A title with no match is a 404, not charged. Up to 20 results.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Full French company profile by SIREN: official company data from the French company registry (INSEE Sirene / INPI RNE). One lookup returns legal name, legal form, head office, NAF code, workforce bracket, creation date, active or ceased status, officers with name and role, collective agreement, the intra-EU VAT number and, for LEI holders, the GLEIF level-2 group (groupe_lei: consolidating parents or declared reason for none). The core KYB building block for verifying a French counterparty.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
PDF download of official documents from the French INPI RNE registry, by type (actes | bilans) and document ID from the document list endpoint. Filed annual accounts (bilans): any payer. Legal deeds (actes: statutes, general-meeting minutes) are RESERVED to identified Sirenic accounts (API key) since 2026-09-19 because they carry personal data — 401 otherwise, nothing charged. 1-10 MB, streamed as-is at request time (application/pdf), never stored: the primary-source evidence, not a summary.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Reverse search for company directors and officers in France: a people search by surname (?nom=) that lists the French companies where a person of that name holds or held an office, with each company SIREN, name and the person role — network mapping and due diligence on directors. Person data is limited to surname, first names, role and birth YEAR (French GDPR/INPI rules). Results are indicative: homonyms are not disambiguated and very common names are capped.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
List topics for an episode. Returns the topic taxonomy classifications for a specific episode.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Hourly air-quality data (PM2.5, PM10, ozone, NO2, European/US AQI) for any lat/lon, from the Copernicus CAMS model served by Open-Meteo (CC-BY 4.0), updated hourly. Query: ?latitude=48.8566&longitude=2.3522&hourly=pm2_5,pm10,european_aqi&forecast_days=2 (1..7 days). Returns parallel time/value arrays with units; cached 1h.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Resolves an ISBN-10 or ISBN-13 to a normalized bibliographic record from Open Library (Internet Archive): title, authors, publishers, publish date, page count, ISBN identifiers, subjects and cover image URL. Query: ?isbn=9780140328721 (hyphens/spaces tolerated). Unknown ISBNs return 400 (not charged). 7-day cache. Built for catalog management, e-commerce listings and used-book pricing agents.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Latest METAR observation, decoded, for any ICAO airport worldwide (NOAA AviationWeather.gov): wind direction/speed/gust (kt), temperature/dewpoint (C), visibility, QNH altimeter (hPa), flight category (VFR/MVFR/IFR/LIFR) plus the raw METAR string. Query: ?ids=KJFK,LFPG (1-10 comma-separated ICAO codes). Observations refresh every 30-60 min; 5 min cache.
The price is the seller’s own listing. it demanded payment when we knocked, on 2026-10-21.
Use when an agent needs bazaar seller rank. Returns x402 Bazaar seller leaderboard: top 25 seller addresses ranked by settled 30d calls in the latest daily full-catalogue snapshot, with listing count, unique 30d payers and each seller’s busiest resource. $0.003.
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.