x402watch

53,296 paid endpoints are listed. 24,164 answered a real 402 at the last check.

Every x402 endpoint on the Coinbase Bazaar and x402scan, probed unpaid every six hours. A listing tells you the price a seller wrote down. This tells you whether the endpoint is reachable, whether it charges what it declared, and how fast it answers. Ranked by an assay score out of 100.

Last check 2026-10-06 18:44 UTC · 53,296 probed

24,164 answering 40223,338 down4,952 rejecting842 no paywall1,722 price drift
  1. 92agents.x402stock.xyz/zcj/fvwl6iui5hw7/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base857 ms2 payers100% up
  2. 92agents.x402stock.xyz/zcj/daf16vjmj8zc/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base948 ms2 payers100% up
  3. 92agents.x402stock.xyz/zcj/bix0q2ftw9s0/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base767 ms2 payers100% up
  4. 92agents.x402stock.xyz/zcj/azowpj2chxvk/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base706 ms2 payers100% up
  5. 92agents.x402stock.xyz/zcj/94a2u2gf0x73/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base989 ms2 payers100% up
  6. 92agents.x402stock.xyz/zcj/8i19j7rztuf0/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base602 ms2 payers100% up
  7. 92agents.x402stock.xyz/zcj/6x7dbb24n829/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base872 ms2 payers100% up
  8. 92agents.x402stock.xyz/zcj/6cqeoo4yiiok/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base775 ms2 payers100% up
  9. 92agents.x402stock.xyz/zcj/5fiabrw2b70q/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base850 ms2 payers100% up
  10. 92agents.x402stock.xyz/zcj/4ju0nvx0z7bi/api/v1/avg-interest-ratesThe average interest rate the US Treasury currently pays on its outstanding debt, broken out by security (Treasury Bills, Notes, Bonds, TIPS, FRNs, savings, and the marketable/total aggregates) for the latest reported month, in percent. No ticker needed. A read on the government's cost of borrowing that complements the /treasury-yields curve. Sourced from the US Treasury (FiscalData).$0.01 Base726 ms2 payers100% up
  11. 92agents.x402stock.xyz/zcj/3qg92ca4l21d/api/v1/treasury-yieldsThe daily US Treasury par yield curve (Constant Maturity Treasury rates) for every maturity from 1 month to 30 years, in percent. Defaults to the latest published day; pass `?limit=` for more recent days (max 250) and `?year=YYYY`. No ticker needed. Use for the risk-free rate, rate-sensitivity context, and yield-curve inversion in macro-aware analysis. From x402stock$0.01 Base988 ms2 payers100% up
  12. 92agents.x402stock.xyz/api/v1/trending/4chanWhat tickers 4chan's finance board (/biz/) is buzzing about most over the last 24h, ranked by mention volume. Each ticker carries its mention count and 24h change in rank and mentions (4chan has no upvotes, so upvotes is always 0). No ticker needed; ?page= to paginate (100 per page). A raw read of /biz/ chatter, separate from the Reddit feed. From x402stock$0.01 Base527 ms2 payers100% up
  13. 92agents.x402stock.xyz/api/v1/hip3/dexsList every permissionless builder-deployed perp DEX on Hyperliquid (HIP-3). Each lists synthetic, oracle-priced 24/7 perp markets — US equities, commodities (gold, oil, copper), FX, and global index perps — that Hyperliquid's core perps and US-only stock feeds don't carry. Returns each DEX's id, name, deployer, and market count. Then read a DEX's markets at /api/v1/hip3/{dex}. From x402stock$0.01 Base658 ms2 payers100% up
  14. 92agents.x402stock.xyz/api/v1/energyEvery energy benchmark in one call: WTI and Brent crude oil spot, Henry Hub natural gas spot, and US regular retail gasoline — each with its latest price, prior reading, and change. The catalog's commodities feed (no equity/forex/crypto endpoint carries these). For one benchmark with history use /api/v1/energy/{product}. Source: U.S. Energy Information Administration (EIA). From x402stock$0.02 Base630 ms2 payers100% up
  15. 92agents.x402stock.xyz/api/v1/spotLive on-chain spot prices for every token on the Hyperliquid DEX (HYPE, PURR, and hundreds more), quoted in USDC: mid/mark price, previous-day price, 24h USD and base volume, circulating and total supply, and market cap — sorted by 24h volume. Spot, not derivatives: for funding/open interest use /api/v1/perps; for major-coin fiat prices use /api/v1/crypto. From x402stock$0.02 Base653 ms2 payers100% up
  16. 92agents.x402stock.xyz/api/v1/calendarUpcoming US economic data releases — WHEN the market-moving prints land, not just their latest values. Returns curated high-importance releases (CPI, PPI, PCE, jobs, JOLTS, GDP, retail sales, housing starts, industrial production) within `?days=` (default 30, max 90), each with date and category, plus the next FOMC meeting. `?past=true` includes the last week. Release dates from FRED.$0.02 Base584 ms2 payers100% up
  17. 92x402-factory.com/v1/forecast/san-diegoHourly San Diego weather forecast (blend model, method labeled) — Hourly weather forecast for San Diego: temperature, precipitation probability, and wind, up to 168 hours out. NWS-derived series, bias-blended with our calibrated station model where covered — every response labels the method that produced it. Same shape as /v1/forecast/point with the San Diego coordinates built in.$0.01 Base372 ms2 payers100% up
  18. 92x402-factory.com/v1/forecast/san-antonioHourly San Antonio weather forecast (blend model, method labeled) — Hourly weather forecast for San Antonio: temperature, precipitation probability, and wind, up to 168 hours out. NWS-derived series, bias-blended with our calibrated station model where covered — every response labels the method that produced it. Same shape as /v1/forecast/point with the San Antonio coordinates built in.$0.01 Base378 ms2 payers100% up
  19. 92402.com.tr/api/x402/url-extractPass a URL and get the page as clean text — furniture (nav, scripts, ads, footers) stripped, paragraphs preserved — plus its title, description and site name. The step every agent needs before it can reason about a page, and the one most agents can't do themselves: serverless runtimes and MCP clients have no browser and no HTML parser. Follows redirects safely, refuses non-text content, caps at 2 MB. Nothing crypto about it.$0.002 Base735 ms2 payers100% up
  20. 92402.com.tr/api/x402/token-supply🆕 totalSupply for any Base token, returned raw and scaled by its decimals, alongside the name and symbol. When a contract doesn't declare decimals the answer assumes 18 and marks that it assumed — a silent guess here quietly moves every downstream number by orders of magnitude. Non-token addresses answer found:false.$0.002 Base840 ms2 payers100% up
  21. 92402.com.tr/api/x402/base-nonce🆕 The next nonce for any Base address, plus its ETH balance and whether it is a contract. The count means different things either side of that line — transactions sent for a wallet, contracts deployed for a contract — so both are reported under their own name instead of one ambiguous number. What you need before building a transaction, or to tell a fresh address from a used one.$0.002 Base898 ms2 payers100% up
  22. 92402.com.tr/api/x402/file-convertConvert between the shapes data actually arrives in: CSV or TSV to JSON, JSON to CSV or TSV, CSV to a Markdown table, Markdown to HTML. Proper RFC 4180 parsing — quoted fields, embedded commas and newlines, doubled quotes — so a spreadsheet exported by a human does not silently come apart. Numbers and booleans get real types (turn it off with typed=false). No model call and no upstream: local parsing only.$0.005 Base488 ms2 payers100% up
  23. 92402.com.tr/api/x402/ssl-checkTLS probe for host=: subject, issuer, validFrom/validTo, daysRemaining, expired/expiringSoon, fingerprint. GO/HOLD/STOP from dates. Chain trust is not asserted — dates and identity fields are.$0.01 Base459 ms2 payers100% up
  24. 92402.com.tr/api/x402/geocodeForward geocode an address (q=) or reverse geocode lat=+lon= using OpenStreetMap Nominatim. Returns up to 5 hits with display name and address parts. Community map data — not a postal authority.$0.01 Base875 ms2 payers100% up
  25. 92402.com.tr/api/x402/ens-resolveForward + reverse ENS resolution on Ethereum mainnet: turn vitalik.eth into an address, or an address into its primary ENS name. Complements the Basename resolver for Base.$0.01 Base933 ms2 payers100% up
  26. 92www.x402scan.com/api/x402/origins/sol.blockrun.ai/resourcesResources for a specific origin/domain$0.01 Base446 ms2 payers100% up
  27. 92stableninja.dev/api/play-store-apps/top-paid-gamesFetch Google Play Store top paid games.$0.01 Base531 ms2 payers100% up
  28. 92bytemine.pay.zeroclick.io/functions/v1/api-gateway/contacts/:contactIdRetrieve a specific contact's full profile by ID.$0.01 Base768 ms2 payers100% up
  29. 92x402-factory.com/v1/forecast/nycHourly New York City weather forecast (blend model, method labeled) — Hourly weather forecast for New York City: temperature, precipitation probability, and wind, up to 168 hours out. NWS-derived series, bias-blended with our calibrated station model where covered — every response labels the method that produced it. Same shape as /v1/forecast/point with the New York City coordinates built in.$0.01 Base308 ms2 payers100% up
  30. 92x402-factory.com/v1/forecast/nashvilleHourly Nashville weather forecast (blend model, method labeled) — Hourly weather forecast for Nashville: temperature, precipitation probability, and wind, up to 168 hours out. NWS-derived series, bias-blended with our calibrated station model where covered — every response labels the method that produced it. Same shape as /v1/forecast/point with the Nashville coordinates built in.$0.01 Base318 ms2 payers100% up
  31. 92iposignal-dashboard-372lo399x-waltermelonlangs-projects.vercel.app/api/agent/ipo/by-symbol/CRCLFull IPO company profile with AI research, valuation analysis, and deal terms$0.01 Base859 ms2 payers100% up
  32. 92api.apify.com/v2/actors/:actorId/runsApify Store is the largest marketplace of tools for AI agents. Extract data from any website and automate your workflows with thousands of scrapers, crawlers, and automation tools called Actors.$1.00 Base427 ms2 payers100% up
  33. 922s.io/api/license/brokerFINRA BrokerCheck lookup — every US registered broker / investment advisor (~620k current + former). Search by free-text query (name + firm) or by CRD number for a direct individual record. Each result includes CRD ID, name (with any 'doing business as' aliases), broker-check + IA scope (Active/Inactive), a hasDisclosures flag (yes/no for complaints, settlements, terminations on file), industry-start date, FINRA registration count, and current + previous employments (firm name, branch city/state, registration dates). Public per FINRA's investor-protection BrokerCheck program; pair with /api/finance/sec-filings for cross-reference.$0.003 Base503 ms2 payers100% up
  34. 922s.io/api/security/http-headersFetch a URL and grade its HTTP security headers. Pass url (scheme optional — defaults to https). Returns an overall letter grade + score, the list of present/missing headers, and a per-header analysis with the live value and specific issues for: Strict-Transport-Security (HSTS max-age/includeSubDomains), Content-Security-Policy (flags 'unsafe-inline'/'unsafe-eval'/missing default-src), X-Frame-Options or CSP frame-ancestors (clickjacking), X-Content-Type-Options (nosniff), Referrer-Policy, Permissions-Policy, and Cross-Origin-Opener/Resource-Policy. Also flags Server/X-Powered-By info disclosure. Analyzed from the target's LIVE response headers through an SSRF-guarded fetch (private/loopback targets refused) — an LLM cannot see a site's current headers. For web-app security review, vendor assessment, and CI gates.$0.0045 Base401 ms2 payers100% up
  35. 922s.io/api/search/endpointsFind the right 2s endpoint for a task using natural language. Pass q (e.g. 'check if a domain can be spoofed', 'is this CVE being exploited', 'screen a company for sanctions', 'decode a VIN') and get back the catalog's most relevant endpoints, ranked, each with its id, API path, method, group, description, and price. Deterministic keyword + synonym matching over the live endpoint registry (no LLM, no external calls) — a self-routing index so an agent (or its planner) can discover which paid call answers a question instead of reading the whole 290+ endpoint catalog. Returns the path you then call directly.$0.0025 Base466 ms2 payers100% up
  36. 922s.io/api/research/authorResolve a researcher by ORCID iD. Pass orcid (e.g. 0000-0002-1825-0097, with or without the https://orcid.org/ prefix). Returns the researcher name, affiliations (employments and educations with organization, role, department, years, and a current flag), a total works count, and a works summary (title, type, year, DOI when present). Data: ORCID Public API, free and keyless; per-record visibility is set by the record holder. The canonical author key in scholarly metadata — pair with /api/papers/search, /api/paper/doi-lookup, and /api/research/org (ROR institutions). Use to verify an author identity, current institution, or publication record before citing.$0.003 Base331 ms2 payers100% up
  37. 922s.io/api/timezone/lookupResolve a coordinate to its IANA timezone and return the...$0.0025 Base578 ms2 payers100% up
  38. 922s.io/api/crypto/address-validateValidate a cryptocurrency address with full checksum verification (not just regex). Returns {chain, address, valid, canonical, format, reason}. Chains: btc (P2PKH, P2SH, Bech32 SegWit v0, Taproot Bech32m), eth (full EIP-55 checksum; non-checksummed flagged), sol (Ed25519 32-byte Base58), ltc (Base58Check L.../M.../3... + ltc1 Bech32), trx (T-prefix Base58Check 0x41), xrp (r-prefix custom Base58), bch (legacy Base58Check + bitcoincash:q... CashAddr). Catches typos via cryptographic checksum; canonical field returns the checksummed/lowercased form.$0.0025 Base790 ms2 payers100% up
  39. 922s.io/api/word/relatedRelated-word lookup via Datamuse. Supply a seed word and a relation kind: rhymes, near-rhymes, synonyms, antonyms, means (semantic match), triggers (associated by usage), homophones, sounds-like (phonetic neighbour), spelled-like (typo / wildcard), follows-from (words that come after), preceded-by (words that come before). Returns ranked candidates with relevance score, syllable count, and grammatical tags. Useful for content generation, rhyme/poetry, vocabulary expansion, and naming agents.$0.003 Base750 ms2 payers100% up
  40. 922s.io/api/tld/infoTLD registry intelligence and public-suffix analysis. Mode 1 (tld=io): IANA root-zone metadata — type (generic / country-code / sponsored), managing organization, unicode form for IDN TLDs. Mode 2 (domain=shop.example.co.uk): full Public Suffix List algorithm — the effective public suffix (co.uk), the registrable domain (example.co.uk), the subdomain part, the matched PSL rule, and whether the suffix is ICANN (registry) or private (corporate, e.g. github.io / s3.amazonaws.com) — plus the root-zone metadata for its TLD. Correctly handles wildcard and exception rules and IDN/punycode input. Use for cookie scoping, per-registrant rate limiting, URL dedup, and abuse/phishing analysis. Data: IANA root zone + Mozilla PSL, refreshed weekly.$0.0025 Base303 ms2 payers100% up
  41. 922s.io/api/stocks/company-newsRecent news articles about a specific US-listed company. Pass ticker and optionally a from/to date window (YYYY-MM-DD; defaults to the last 14 days); returns headlines with source, summary, URL, image, related symbol, category, and publish time (newest first). Use it to catch up on what is being written about a company. News aggregated by Finnhub.$0.0025 Base343 ms2 payers100% up
  42. 922s.io/api/security/attackAuthoritative MITRE ATT&CK (Enterprise) technique lookup. Pass id (e.g. T1059 or sub-technique T1059.001) for the canonical technique — name, tactics (kill-chain phases), description, platforms, sub-technique flag + parent, mitigations, and detection guidance — or query for a keyword search returning ranked techniques. Bundled current ATT&CK matrix (~700 techniques), zero external calls. Agents cite T-numbers and tactic names that must be exact; this returns version-pinned, citeable data instead of hallucinated IDs. For threat modeling, detection engineering, and report enrichment.$0.0025 Base363 ms2 payers100% up
  43. 922s.io/api/github/search-codeSearch code across GitHub with the code-search syntax (e.g. 'defineEndpoint repo:AlleyFord/2s' or 'addEventListener language:js'). Returns total match count + file name, path, repository, and URL for each hit. Read-only; no caller key needed.$0.0025 Base342 ms2 payers100% up
  44. 922s.io/api/gov/uk-crimeUK street-level crime around a location from the Home Office data.police.uk service. Give a latitude/longitude (and optional month YYYY-MM, defaults to the latest available — UK data lags ~2 months) and get the total crime count, a breakdown by category (anti-social behaviour, burglary, violent crime, vehicle crime, etc.), and recent individual records (category, approximate street, lat/lon, and outcome status). Free, Open Government Licence (commercial use permitted). Location-risk signal an LLM cannot recall — for property, insurance, and safety agents. Locations are anonymised to nearby map points by the Home Office.$0.0027 Base380 ms2 payers100% up
  45. 922s.io/api/space/satellitesSearch the catalog of every cataloged Earth-orbiting object — ~69,000 satellites, rocket bodies, and debris tracked by US Space Force / 18 SDS (via CelesTrak SATCAT). Filter by name (q, e.g. "starlink"), owner/launching country (owner — code like US/PRC/CIS or a name like "china"), object type (type = payload | rocket body | debris | unknown), launch-year range (launchYearFrom/launchYearTo), international/COSPAR designator prefix (intlDesignator, e.g. "2024-"), on-orbit vs decayed (onOrbit), or exact NORAD number (noradId). Each result carries the NORAD id, name, international designator, object type, owner + resolved country, launch date + site, decay date (null = still in orbit), and orbital parameters (period, inclination, apogee, perigee). The envelope total is the full count matching your filter — so onOrbit=true&type=payload answers "how many active satellites are up there", and owner=PRC tells you who launched them. For a satellite's live sub-point position, pass its noradId to /api/space/satellite.$0.003 Base386 ms2 payers100% up
  46. 922s.io/api/nonprofit/searchUS 501(c) nonprofit organization search. Lookup by 9-digit EIN (with or without hyphen), free-text name, 2-letter state, NTEE category code (e.g. 'B99' for education), or IRS subsection code (3 = 501(c)(3), 4 = 501(c)(4), etc.). Each record includes EIN, name, city/state, NTEE code, subsection code + human-readable subsection description (e.g. '501(c)(3) Charitable / Religious / Educational'), and relevance score. Sourced from ProPublica Nonprofit Explorer, which aggregates IRS Form 990 + BMF data; underlying IRS data is public domain.$0.003 Base353 ms2 payers100% up
  47. 922s.io/api/gov/osha-inspectionsSearch OSHA inspection records via the US Department of Labor Open Data Portal (~5M historical inspections). Filter by US state (2-letter), city, zip, or establishment-name substring (estabName, case-insensitive). Optional `filter` accepts raw OData-style clauses (joined with AND); `fields` selects columns; `sort` sorts (prefix with `-` for desc). Each row carries activity number, reporting id, establishment name + full site address, owner type/code, advance-notice flag, safety/health type, SIC + NAICS industry codes, open + close dates, host establishment number, union status. Backbone of workplace-safety + investigative-journalism agents.$0.003 Base370 ms2 payers100% up
  48. 922s.io/api/gov/fec-totalsAggregate financial summaries (receipts, disbursements, cash-on-hand, debt, transfers, refunds, contributions by source, etc.) per cycle for federal candidates (scope=candidates) or committees (scope=committees). Filter by candidateId / committeeId, cycle, office (P/S/H), party, state, district. For candidates, electionFull=true rolls all cycles of a single election into one row (e.g. a presidential cycle spans 4 years). Use this for top-line "how much did they raise/spend" answers without paging through millions of itemized transactions.$0.003 Base376 ms2 payers100% up
  49. 922s.io/api/gov/congress-tradesSearch individual US Congress member stock trades, parsed from STOCK Act Periodic Transaction Reports into clean rows. Filter by member name (q, e.g. "Pelosi"), ticker (e.g. NVDA), transaction type (purchase | sale | exchange | partial_sale), party (D | R | I), 2-letter state, chamber, or transaction-date range (dateFrom/dateTo). Each trade returns the member + party + state/district, owner (self/spouse/joint/dependent), ticker + asset description, buy/sell, the disclosed dollar RANGE (amountMin/amountMax — disclosures are ranges, not exact), the transaction date, the disclosure date, days-to-disclose (compliance lag), and a link to the source filing PDF. The envelope total is the full count matching your filter — so ticker=NVDA&type=purchase counts who bought NVIDIA. Amounts are ranges by law; trades are disclosed up to 45 days after they happen (current-to-the-filing). Coverage: US House + Senate e-filed PTRs; scanned/handwritten reports are parsed separately. Data: US House Clerk / US Senate eFD (public domain). Cross-ref /api/gov/congress-filings for the raw filing index.$0.003 Base389 ms2 payers100% up
  50. 922s.io/api/gov/congress-hearingLook up or list US Congressional hearings via Congress.gov. Pass congress + chamber + jacketNumber to fetch a single hearing with full detail (title, dates, committee, transcripts/recordings if available). Or filter list by congress + chamber, with optional date range. Hearings cover committee testimony from the executive branch, subject experts, and stakeholders — primary-source material for oversight + policy research.$0.003 Base410 ms2 payers100% up
  51. 922s.io/api/dev/rfcLook up an IETF RFC by number. Pass number as RFC2616, 2616, or the integer 2616. Returns the RFC title, authors, publication date, status (e.g. INTERNET STANDARD, PROPOSED STANDARD, DRAFT STANDARD, INFORMATIONAL, EXPERIMENTAL, HISTORIC, BEST CURRENT PRACTICE), stream (IETF/IAB/IRTF/Independent/Legacy), DOI, canonical rfc-editor.org URL, and the full standards relationship chain: which RFCs this one obsoletes / is obsoleted by, and which it updates / is updated by. Authoritative data from the IETF/RFC Editor index. Use this to resolve whether a spec is current or superseded before relying on it.$0.003 Base421 ms2 payers100% up
  52. 922s.io/api/aviation/tafTerminal Aerodrome Forecast (TAF) for one or more airports — the official aviation forecast issued for an airport (~24–30h ahead). Pass ids = comma-separated ICAO station ids (e.g. KATL). Returns the raw TAF text + issue time. Source: NOAA Aviation Weather Center (keyless). For current conditions use aviation.metar.$0.003 Base397 ms2 payers100% up
  53. 922s.io/api/weather/forecastOfficial US weather forecast for a coordinate (US land + territories). Pass lat + lon. Returns the National Weather Service forecast as a list of periods — by default ~7 days of day/night periods; pass hourly=true for an hour-by-hour forecast. Each period gives the temperature + unit, wind speed/direction, chance of precipitation, and a short + detailed forecast, plus the resolved city/state and issuing office. Source: US National Weather Service (api.weather.gov), public domain. For active warnings use weather.alerts.$0.0036 Base381 ms2 payers100% up
  54. 922s.io/api/edu/school-lookupLook up any US public K-12 school (~102k, NCES Common Core...$0.0036 Base365 ms2 payers100% up
  55. 922s.io/api/bio/speciesResolve any organism by scientific or common name to the GBIF taxonomic backbone — the canonical free reference for life on Earth. Returns the accepted scientific name + canonical name, taxonomic rank and status, the match type/confidence, the full classification (kingdom → phylum → class → order → family → genus → species), up to 8 English vernacular (common) names, the count of recorded occurrences worldwide, and the GBIF species URL. Biodiversity, ecology, education, and as a taxonomy normalizer for other pipelines. Fuzzy-matches misspellings. CC-BY GBIF data.$0.0036 Base372 ms2 payers100% up
  56. 922s.io/api/bio/proteinLook up a protein in UniProtKB by accession (e.g. "P04637", "Q9Y6K9", "P0DTC2"). Returns the entry id, reviewed (Swiss-Prot) flag, recommended + alternative protein names, gene names, organism + taxid, sequence length and molecular weight, the curated function description, subcellular locations, Gene Ontology terms (id + term + aspect: biological_process / molecular_function / cellular_component), PDB structure ids, and keywords. Bioinformatics, structural biology, drug-target research, education. Gene-centric sibling: /api/bio/gene. CC-BY UniProt data.$0.0036 Base403 ms2 payers100% up
  57. 922s.io/api/gov/districtResolve a US street address to its congressional district (119th Congress), state, and county, via the US Census Bureau geocoder. Returns the matched/normalized address, latitude/longitude, state (name + 2-letter abbreviation), county, and the district number within the state (null for at-large or non-voting delegate districts). The point-in-polygon district lookup is something an agent can't do from a sandbox. Pair it with the gov/congress.* endpoints to find the representatives once you have the state + district. Public domain, keyless.$0.0045 Base412 ms2 payers100% up
  58. 922s.io/api/factcheck/searchSearch the global corpus of published fact-checks (ClaimReview) by free-text claim. Returns matching claims with the claimant, claim date, and each fact-check review's verdict (textualRating, e.g. "False", "Misleading", "True"), the publisher (PolitiFact, Snopes, FactCheck.org, Reuters Fact Check, AFP, …), the review URL, and review date. Covers every topic — politics, health, science, viral and misinformation claims. Optional language, recency (maxAgeDays), and publisher-site filters. Aggregated by Google from publishers' schema.org ClaimReview data. Use it to check whether a claim has been independently fact-checked and how it was rated, rather than asserting from training data.$0.0045 Base452 ms2 payers100% up
  59. 922s.io/api/crypto/contractDecode an EVM smart contract. Pass chain (ethereum, base, polygon, arbitrum, optimism, bsc, avalanche) + address; returns whether the contract is source-verified (Sourcify), its name/compiler/language, whether it is a proxy and its implementation address, and human-readable function and event signatures from the ABI. Optionally pass selector (a 0x 4-byte function selector) to decode what it calls — resolved from the contract's own ABI when verified, otherwise from the public 4byte directory. Pairs with crypto.tx (which gives a `to` address + calldata): turn an opaque contract + selector into "what is this and what does it do." Free, keyless.$0.0045 Base469 ms2 payers100% up
  60. 922s.io/api/vehicle/decode-wmiDecode a 3-character World Manufacturer Identifier (the first three characters of a VIN) to the assigning manufacturer. Returns full manufacturer legal name, common short name, make, vehicle type, and the date NHTSA published the assignment. Useful for partial-VIN analysis — crash reports, damaged-vehicle photos, fleet records — where only the WMI is recoverable. Backed by NHTSA.gov vPIC; data is public-domain US government records.$0.006 Base366 ms2 payers100% up
  61. 922s.io/api/gov/lobbying-filingsSearch US federal lobbying disclosures (Senate LDA filings) — who lobbies for whom, on what issues, for how much. Filter by registrant (lobbying firm name), client (organization being represented), lobbyist (individual name), year, period (first_quarter|second_quarter|third_quarter|fourth_quarter|mid_year|year_end), and type (e.g. RR=registration, Q1-Q4=quarterly reports). Each filing: type, year/period, reported income or expenses (USD), registrant + client (id/name/description/state), lobbying issues (code + description), lobbyist count, official document URL, posted timestamp. Money-in-politics, journalism, and policy-intelligence staple. Public federal data.$0.0072 Base421 ms2 payers100% up
  62. 922s.io/api/airport/nearAirports within a radius of a coordinate, sorted by distance. Query: lat (-90..90), lon (-180..180), radius_km (1-2000, default 200), limit (1-100, default 20), type (optional: large_airport|medium_airport|small_airport|heliport|seaplane_base|balloonport|closed), country (optional 2-letter ISO 3166-1), scheduled_service (optional bool, true = commercial-service airports only). Returns { query, count, airports: [{ id, ident, name, iataCode, icaoCode, type, latitude, longitude, distanceKm, ... }] }.$0.0025 Base539 ms2 payers100% up
  63. 92agent402.tools/api/x402/seller-trustTrust evidence for any x402 seller origin: is it indexed, does its manifest parse, how many tools does it publish, which chains does it actually advertise, how many settled calls has it been observed receiving on-chain, and would our own Smart Order Router spend buyer money on it. Returns the router's gate field by field, so a refusal is explainable. Never fetches the seller at call time - this is our accumulated crawl and settlement evidence, not a liveness probe.$0.005 Base405 ms2 payers100% up
  64. 92agent402.tools/v1/judgeTyped judgment ($0.001/call via x402 or MPP)$0.001 Base373 ms2 payers100% up
  65. 92x402scan-git-router-117-merit-systems.vercel.app/api/x402/merchantsPaginated list of merchants (top recipients by volume)$0.01 Base387 ms2 payers100% up
  66. 92mailcheck.hugen.tokyo/mailcheck/validate6 email validation checks in one call — syntax (RFC 5322), MX record verification, disposable detection (5,000+ domains), free provider identification, role-based address detection (admin@, info@), and typo suggestion. Returns a 0-1 confidence score with detailed per-check results. POST method protects email addresses from access logs. No API keys, no multiple service integrations needed. Accepts USDC payments on Base and Solana$0.01 Base618 ms2 payers100% up
  67. 92contextiq.trango-compute.com/api/v1/policy-check/x402-v2Agent Commerce Gate — pre-payment counterparty risk check (identity + reputation + payment challenge) — per call$0.02 Base558 ms2 payers100% up
  68. 92rentcast.x402.paywithlocus.com/rentcast/propertiesLocus public pay-per-use API$0.033 Base494 ms2 payers100% up
  69. 92x402.fairseal.io/v1/veo/verifyVerify AI agent outputs against a VEO-2 schema. Checks structural validity, SHA-256 hash integrity (if content hash is present), and optional cryptographic signature on the output (if proof.provider_signature is present). Returns a verdict with per-check details.$0.002 Base571 ms2 payers100% up
  70. 92api.apify.com/v2/acts/:actorId/runsApify Store is the largest marketplace of tools for AI agents. Extract data from any website and automate your workflows with thousands of scrapers, crawlers, and automation tools called Actors.$1.00 Base409 ms2 payers100% up
  71. 92api.itsgloria.ai/news-by-keywordGet the news about a topic by keyword, delivering the most recent 20 headlines.$0.05 Base442 ms2 payers100% up
  72. 92medien.halowerk.com/v1/sttTakes an audio or video file by URL or inline base64 and returns the transcript: the full text, every word with start and end time and its own confidence, the utterances and paragraphs the recogniser separated, and the detected language with its confidence where no language was specified.$0.06 Base442 ms2 payers100% up
  73. 92handel.halowerk.com/v1/allergen-checkReturns what a product declares about allergens: the allergen tags, the trace warnings, the ingredients text in its original language, and the completeness of the record. The distinction it holds to throughout is between not declared and not present. The data come from volunteers and manufacturer submissions, so an empty allergen field means nobody entered one, and for somebody with an allergy that difference is the difference that matters — every absent allergen is therefore reported as not…$0.005 Base459 ms2 payers100% up
  74. 92predict.memoryapi.org/x402/predict/platform_arbFind prediction market arbitrage across Polymarket, Kalshi, and Manifold.$0.001 Base584 ms2 payers100% up
  75. 92karte.halowerk.com/v1/ev-chargingQueries OpenStreetMap for charging stations within a radius of a point and returns each with its position, distance, operator, network, connector types with their individual power ratings and socket counts, access restrictions, fee status, opening hours and whether authentication is required. Results are sorted nearest first and can be filtered to a minimum power or a required connector type, which is the question a vehicle actually has.$0.005 Base475 ms2 payers100% up
  76. 92taskfleet.net/scrapeScrape any website to clean Markdown, text, or structured JSON. Renders JavaScript/SPA pages with headless Chromium (captures content raw-fetch scrapers miss), handles PDFs, optional schema-driven extraction. Input: { url, format? (markdown|text|html), links? (bool), fields? OR schema? }.$0.02 Base669 ms2 payers100% up
  77. 92scout.hugen.tokyo/scout/xSearch X (Twitter) for real-time posts, trends, and discussions via xAI Grok. AI agent API for social media intelligence and sentiment analysis. Accepts USDC payments on Base and Solana$0.20 Base562 ms2 payers100% up
  78. 92contextiq.trango-compute.com/api/v1/dns-inspector/x402-v2DNS Inspector record lookup (A/AAAA/MX/NS/TXT/SOA/CAA + SPF/DMARC) — per call$0.02 Base543 ms2 payers100% up
  79. 92contextiq.trango-compute.com/api/v1/agent-protocol-inspector/x402-v2Agent Protocol Inspector scan (MCP / A2A / ARD / llms.txt) — per call$0.02 Base529 ms2 payers100% up
  80. 92finanz.halowerk.com/v1/commodity-snapshotDay-ahead power prices for a European bidding zone from Energy-Charts, published by Fraunhofer ISE from Bundesnetzagentur SMARD data under CC BY 4.0 and therefore usable commercially with attribution. Returns the quarter-hourly or hourly curve with minimum, maximum, mean, the cheapest and the dearest hour, and how many intervals carry a negative price — the figures a load-shifting or battery decision actually turns on.$0.005 Base470 ms2 payers100% up
  81. 92seo.halowerk.com/v1/title-present-auditTitle present audit fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.$0.001 Base963 ms2 payers100% up
  82. 92api.verigrace.com:4449/api/defi-riskDeFi protocol risk score (0-100) with factor breakdown: TVL momentum, APY level, stablecoin exposure, pool concentration, oracle redundancy, contract age. Pay-per-call: 0.10 USDC on Base via x402. Source: DefiLlama (public data only).$0.10 Base484 ms2 payers100% up
  83. 92x402.coinstats.app/exchange/supportCoinStats list of supported cryptocurrency exchanges for portfolio connection (Binance, Coinbase, Kraken, Bybit, OKX, etc.)$0.001 Base654 ms2 payers100% up
  84. 92x402.coinstats.app/news/sourcesCoinStats list of crypto news sources aggregated across the industry$0.001 Base625 ms2 payers100% up
  85. 92x402.coinstats.app/fiatsCoinStats list of supported fiat currencies (USD, EUR, GBP, JPY, etc.) with conversion metadata$0.001 Base616 ms2 payers100% up
  86. 92bio.halowerk.com/v1/biomarker-longevityStandardizes each supplied value against its supplied mean and standard deviation, flips markers whose favorable direction is lower, and computes a weighted composite mapped to a bounded 0–100 index. The references and weights come entirely from the caller; this is not a validated longevity score, diagnosis, prognosis or medical advice.$0.003 Base521 ms2 payers100% up
  87. 92space.halowerk.com/v1/satellite-passPropagates a circular two-body orbit from altitude, inclination, RAAN, and initial orbital phase; rotates Earth at a fixed sidereal rate; and samples ground-station elevation. It ignores eccentricity, perturbations, epoch-dependent Greenwich angle, refraction, ellipsoid shape, terrain, and antenna masks, so it is a planning estimate rather than operational ephemeris.$0.004 Base510 ms2 payers100% up
  88. 92space.halowerk.com/v1/orbit-decayUses da/dt = -rho×sqrt(mu×a)/ballistic_coefficient for a circular orbit, holds density and ballistic coefficient constant, and linearly projects altitude over a bounded horizon. Real density changes rapidly with altitude and solar activity; the result is not a lifetime prediction or maneuver plan.$0.004 Base353 ms2 payers100% up
  89. 92space.halowerk.com/v1/debris-collisionPropagates two caller-supplied Cartesian states with constant velocity, analytically finds the clamped time of closest approach, and compares miss distance with combined hard-body radius. It ignores gravity, covariance, maneuver uncertainty, tracking error, and nonlinear dynamics and is not an operational conjunction assessment.$0.004 Base493 ms2 payers100% up
  90. 92quantum.halowerk.com/v1/molecule-simComputes all pair distances and a single-parameter Lennard-Jones 12-6 potential using caller-supplied epsilon and sigma. It does not perform quantum chemistry, infer element-specific force fields, relax geometry, model bonds or predict experimental molecular behavior.$0.004 Base433 ms2 payers100% up
  91. 92quantum.halowerk.com/v1/circuit-optimizeCancels adjacent identical self-inverse gates on identical ordered targets and folds adjacent RX, RY or RZ rotations on identical targets. It preserves only these local identities; it does not commute gates, model hardware topology, synthesize arbitrary unitaries or prove global optimality.$0.004 Base510 ms2 payers100% up
  92. 92prop.halowerk.com/v1/flood-risk-assetMultiplies each mutually exclusive supplied scenario probability by its supplied damage fraction and asset replacement value, then sums expected loss. It does not obtain hazard maps, model hydrology, validate damage curves, price insurance or predict a particular event.$0.004 Base626 ms2 payers100% up
  93. 92gov.halowerk.com/v1/quadratic-funding-calcCaps individual contributions when requested, computes each project’s raw quadratic match as (sum sqrt(contribution))² minus direct contributions, and allocates a fixed matching pool proportionally. It does not detect Sybil identities, move funds, or decide project eligibility.$0.004 Base460 ms2 payers100% up
  94. 92geo.halowerk.com/v1/distance-bearingCalculates WGS84 great-circle distance and initial bearing. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. $0.004 Base650 ms2 payers100% up
  95. 92geo.halowerk.com/v1/bbox-tilesEnumerates XYZ tile coordinates intersecting a WGS84 bounding box. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. $0.004 Base623 ms2 payers100% up
  96. 92gaming.halowerk.com/v1/cross-game-bridgeApplies caller-supplied rename and numeric scale/offset rules to scalar attributes, optionally retaining unmapped fields, then hashes the canonical mapped payload. It does not transfer ownership, call a chain, validate either game, preserve semantics, or authorize asset use.$0.004 Base485 ms2 payers100% up
  97. 92fracht.halowerk.com/v1/dangerous-goodsReturns a supplied published dangerous-goods record for a UN number and exposes missing fields. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. $0.004 Base685 ms2 payers100% up
  98. 92dep.halowerk.com/v1/dependency-depthCalculates reachable transitive dependency count and maximum depth from a supplied graph. Missing facts are returned as null and named in unavailable_fields where applicable. Derived values disclose their method; source-backed values disclose source, time window and age. $0.004 Base650 ms2 payers100% up
  99. 92bio.halowerk.com/v1/crispr-offtargetCompares one guide with caller-supplied candidate protospacers, weights mismatches in the guide’s final ten positions twice, applies a simple NGG PAM penalty, and ranks a transparent similarity score. It does not search a genome, model bulges, chromatin or nuclease-specific biology, and must not be used as a clinical or laboratory safety decision.$0.004 Base508 ms2 payers100% up
  100. 92bio.halowerk.com/v1/allergen-epitopeBuilds amino-acid k-mer sets, calculates Jaccard similarity, and finds the highest contiguous identity between each supplied epitope and any equal-length window of the query. It does not predict immune binding, allergenicity, cross-reactivity or clinical risk and cannot replace curated databases or laboratory testing.$0.004 Base515 ms2 payers100% up