Calendar & scheduling: MCP servers, A2A agents and x402 APIs

• StableTravel Live x402

  Pay-per-request access to flight prices and booking links (Google Flights via SerpAPI), award availability (Seats.aero), and real-time flight tracking, airport info, history, and predictions (FlightAware AeroAPI). No au…

  x402 paid API · 12 endpoints · check 90/100

• x402node Live x402

  x402node — precise, deterministic developer and data tools for AI agents. Chain data, parsing, crypto, conversion. Pay-per-call over x402, settled in USDC on Base.

  x402 paid API · 12 endpoints · check 90/100

• Agent Restaurant Reservation API Live x402

  Agent-first API for searching and booking restaurant reservations via Resy, including reservation jobs that book hard-to-get tables the moment reservations open. Supports MPP (Tempo) and x402 (Base/Solana) wallet auth,…

  x402 paid API · 4 endpoints · check 89/100

• 2s.io Live x402

  Latest daily stock quote for a US-listed ticker. Returns the most recent completed trading session: open, high, low, close, volume, VWAP, and trade count, plus the change and percent change versus the prior session, and…

  x402 paid API · 12 endpoints

• agent-market-one.vercel.app Live x402

  Upcoming Federal Reserve FOMC meetings, press conferences, speeches, testimony and releases with ET times, speakers and a market-moving flag.

  x402 paid API · 1 endpoint

• agents.x402stock.xyz Live x402

  The 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 `…

  x402 paid API · 12 endpoints

• alphapipeline-eu.onrender.com Live x402

  Real-time pre-trade signal: a probability snapshot of Hyperliquid's HIP-4 prediction markets - crypto price binaries, sports outcomes, tournament winners, Fed rate decisions, and more. Fields are parsed verbatim from Hy…

  x402 paid API · 12 endpoints

• bazaar-catalog.vercel.app Live x402

  Convert Gregorian dates to Hijri (Umm al-Qura calendar) and back. Returns day/month/year, Arabic and English month names, and a formatted Arabic date string. Essential for agents handling Islamic events, Ramadan, Hajj s…

  x402 paid API · 2 endpoints

• biotechcatalystsentinel.com Live x402

  PDUFA dates a company put in an SEC filing, not a calendar of every US-listed biotech. Each date is grounded in a verbatim filing quote, cited to its EDGAR accession, and scored against the FDA decision. Use when you ne…

  x402 paid API · 2 endpoints

• byfaro.ai Live x402

  Single-signal check: is this website's pricing machine-readable for AI agents? Detects Offer schema with price/availability and pricing-transparency signals. Returns yes/no plus underlying checks and fixes. Useful for p…

  x402 paid API · 2 endpoints

• cryptodataapi.com Live x402

  Issuer-aggregated daily spot ETF net flows for btc, eth or sol. (7 paid endpoints on cryptodataapi.com.)

  x402 paid API · 7 endpoints

• domain-availability-checker.underscoredone.com Live x402

  Give this API up to 10 domain names and it tells you whether each has a registration record at the official registry. It uses RDAP, the structured replacement for WHOIS, so there is no free-text parsing. Each domain com…

  x402 paid API · 1 endpoint

• earnings.lonestaroracle.xyz Live x402

  Earnings calendar — upcoming report dates, EPS and revenue estimates for up to 30 tickers

  x402 paid API · 1 endpoint

• energy.lonestaroracle.xyz Live x402

  US energy inventory catalyst signal + EIA report calendar (optional ?report=)

  x402 paid API · 1 endpoint

• extract.tollkit.dev Live x402

  Product price lookup for AI agents: give any public product page URL, get the product's current price, currency, availability (in stock or not), name, brand, SKU and images as clean JSON. The page is rendered in a real…

  x402 paid API · 2 endpoints

• ioswarm.io Live x402

  Live quotes for up to 8 symbols — stocks, ETFs, crypto pairs (BTC-USD), FX — price, session change and currency, in the paid response. $0.01 per call, no account. (32 paid endpoints on ioswarm.io.)

  x402 paid API · 12 endpoints

• japan-business-day-api.matchan962.workers.dev Live x402

  Japanese traditional calendar for a date: rokuyo (taian/butsumetsu... lucky days used for weddings, funerals, contracts), Japanese era (Reiwa) date, old lunisolar calendar date incl. leap months, 24 solar terms (sekki)…

  x402 paid API · 10 endpoints

• kaisha-api.hp-vladic.workers.dev Live x402

  Japanese business-day calculator: check if a date is a business day, add N business days to a date, or count business days in a range. Accounts for weekends and Japanese national holidays; optional Saturday and year-end…

  x402 paid API · 2 endpoints

• market.memoryapi.org Live x402

  Institutional investor SEC Form 13F filings. Look up any institution by CIK or name to get their latest 13F filing date and link. (9 paid endpoints on market.memoryapi.org.)

  x402 paid API · 9 endpoints

• percallapi.com Live x402

  Lookup WHOIS records and domain availability in JSON format. Provide the domain name via ?domain=example.com to query registrar, status, and expiration dates. (5 paid endpoints on percallapi.com.)

  x402 paid API · 5 endpoints

• professorsausages.com Live x402

  Newest headlines from a deduped, tiered 972-feed direct portfolio (primary sources + wires/majors + trade press + Hacker News + gated GDELT), newest first, up to 100 per call — filter by category, source, and language;…

  x402 paid API · 12 endpoints

• pulse.chainverdict.xyz Live x402

  API uptime and reliability monitoring for any x402 endpoint: a live quality verdict covering availability, uptime, latency percentiles, 402-offer conformance, price-drift and payTo-stability flags. Deterministic and re-…

  x402 paid API · 5 endpoints

• qist.info Live x402

  Convert Gregorian dates to Hijri (Umm al-Qura calendar) and back. Returns day/month/year, Arabic and English month names, and a formatted Arabic date string. Essential for agents handling Islamic events, Ramadan, Hajj s…

  x402 paid API · 2 endpoints

• quotient-api-gateway.onrender.com Live x402

  Use this to read published Quotient signals. Sports signals return one game-level pick and markets[] with every linked venue listing, its signal_side, price, and availability. No venue is primary or preferred. Missing q…

  x402 paid API · 12 endpoints

• stable-domains-git-ben-upgrade-agentcash-r-bb6a65-merit-systems.vercel.app Live x402

  Check domain availability and current registration price.

  x402 paid API · 1 endpoint

• the-stall.intuitek.ai Live x402

  Earnings calendar for upcoming US stock reports — earnings date, EPS estimate, pre/post-market timing. Filter by ticker for per-company lookups, or scan a date window (1–90 days ahead) for calendar-driven research autom…

  x402 paid API · 4 endpoints

• tools.halowerk.com Live x402

  Ordnet eine Warenbeschreibung der sechsstelligen Harmonisierten Nomenklatur der Weltzollorganisation zu, 6.940 Positionen. Versteht deutsche Warenbezeichnungen einschliesslich zusammengesetzter Woerter ueber einen Fachw…

  x402 paid API · 12 endpoints

• torii-gateway-production.ichis-lab.workers.dev Live x402

  Tell whether a given date is a Japanese business day. Japanese national holidays and business-day calculations derived from the Cabinet Office official CSV. Returns holidays for a given year, plus business-day arithmeti…

  x402 paid API · 1 endpoint

• x402-factory.com Live x402

  Cheapest endpoint: liveness plus x402 payment pipeline check — Returns ok with the server time and whether this call was paid. Use it to verify your x402 client end to end before spending on data endpoints. (189 paid en…

  x402 paid API · 12 endpoints

Related capabilities

x402 paid APIsTrading & marketsMaps & travelEmailAgent infrastructureOn-chain dataResearchPayments

How to use one

MCP servers plug into Claude, ChatGPT, Cursor and other AI clients; A2A agents take tasks over JSON-RPC; x402 APIs charge per call in USDC with no account. Guides: A2A vs MCP · How to call an A2A agent · x402 for agents.

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