Explore APIs

Clinical trial search — find ClinicalTrials.gov studies by free text, condition, intervention, sponsor, recruitment status and phase, and get each study's NCT id, titles, status, phases, conditions, interventions, sponsor, start and completion dates, enrollment and whether results are posted. Use for drug development, medical research and patient-recruitment questions.

Cosmetic procedure cost intelligence for healthcare and consumer-health agents. Returns ASPS benchmarks, a total cost breakdown, and financing options for any elective procedure.

Four Pillars (BaZi) chart for a date and optional time: stems, branches, animals, five-element counts, day master.

NIH-funded project search — find grants by words in the title, abstract or research terms, filtered by fiscal year, NIH institute, organisation, state, activity code, SBIR/STTR mechanism or award size, with the fiscal-year award amount, investigators, organisation and dates for each. Use to see who NIH funds on a topic, how much, and which small companies.

Convert an airline radio callsign (SPEEDBIRD) to its airline, or an airline code or name to its callsign.

Twitter (X) video & image downloader — pass a public tweet / X post URL, get direct CDN media links: .mp4 video URLs with thumbnails plus every image in the post, ready to stream, embed, re-host, or download. No scraping or browser automation.

Before your agent negotiates or shares data with another agent, make both prove they qualify. Open a channel with on-chain conditions (a USDC balance, a governance token, a verified attestation). Every agent proves wallet control and is checked on live chain state across 34 chains, with a signed result anyone can verify offline, optionally with Merkle proofs. Re-check on demand; whoever stops qual

Use before paying an x402 endpoint you have not used before, when you cannot tell a working seller from a trap, a testnet address dressed as mainnet, or a listing whose price no longer matches its challenge. Returns a verdict — live, degraded, trap, testnet or dead — a 0-100 risk score, and the specific findings behind both, so an agent can decline a bad endpoint instead of learning about it by lo

Full transcript of any YouTube video by video id or URL: captions/subtitles as clean plain text plus timestamped segments, the video's chapter markers, and every caption track it offers so an agent can pick a language and re-fetch. YouTube transcript, video to text, captions extraction, subtitle download, closed captions, speech to text, multilingual, asr and authored tracks. No API key.

Fetch a URL and extract structured metadata from its HTML: title, description, canonical URL, language, favicon URL, RSS/Atom feed links, Open Graph tags (og:title, og:image, og:type, og:description, og:url), Twitter Card tags, and other meta tags (author, keywords, robots). Use this to get Open Graph data, preview cards, or site information without parsing HTML yourself. Send {"url": "https://...

Research cards from KARP, SoulDriver's multi-model research engine: GPT, Gemini, Grok and Claude debate a topic over many rounds and publish a conclusion. Each card gives the conclusion, key insight, warnings, dated figures, consensus status, open questions, research date and staleness. See what is covered first with the free POST /v1/coverage; verify time-sensitive points with POST /v1/check. Cat

Rates for up to 10 currencies against one base at once, with each one's 30-day change, strongest and weakest first.

falcon.sol: Use this when you need to size debt or compare credit risk across US public companies. Send up to 12 tickers; get gross and net leverage, interest coverage, FCF/debt, debt capacity under leverage, coverage and DSCR limits, capacity at peer-median leverage, 3 structures with indicative ratings, and a short credit memo. Every assumption is returned and overridable. $0.24 USDC.

Free during launch. Independent verification of AI agent output before you pay: an invoice or deliverable against your JSON Schema and rules. Pass/fail, % passed, fix hints, signed attestation and receipt. $0.02 USDC after, no signup, x402 v2.

Buy agent energy (kWh) up to a max price — matches cheapest resting sellers, settles USDC to seller wallets on Base L2

Official UK bank holidays for England and Wales, Scotland or Northern Ireland in a given year, with weekdays, from GOV.UK.

Product recalls (US): is a product, brand, food, drug, medical device or vehicle (make, model, year) under an active FDA, NHTSA or CPSC recall? Severity on one scale, hazard, remedy and lot codes. RecallScout

Give this API a loan amount, an interest rate, and a repayment term, and it returns the exact monthly payment plus a full month-by-month schedule: interest paid, principal repaid, and balance remaining for every payment. Ask what an extra $300 a month, or a $10,000 lump sum in month 24, would do and it reports the months and interest saved. Every figure uses banker's rounding at pinned precision,

Every agent and developer hits broken or confusing JSON. This tool handles the common headaches in one place: check whether JSON is valid with the exact error location, repair near-JSON with typos, pretty-print or minify, pull values out with a path expression, diff two documents, convert to and from YAML or CSV, produce a byte-stable canonical form for hashing, validate against a schema, and repo

This tool reads live information from Hacker News, a popular website where people share and discuss technology news. You can either ask for a current list of stories (like the Top, New, Best, Ask, Show, or Job lists) or ask for every story, job posting, and poll that was posted on one specific calendar day in the past. You can also choose to pull in the discussion comments underneath each story, i

Look up an ENS name or an Ethereum address and get back the matching one, automatically figuring out which direction you need.

Sends a real request to any URL you provide, attaches an Origin header, and reads back all six standard cross-origin permission headers the server returns. Tells you whether cross-origin requests are enabled at all, whether your specific origin is permitted, and shows every permission value exactly as the server sent it. Useful for finding why a browser is blocking a request, confirming a new depl

Checks one or more domains to see whether they are set up to show a brand logo next to emails in Gmail, Apple Mail, and Yahoo. It looks up the BIMI settings the domain has published, checks the logo file follows the required format, checks any logo certificate is valid and unexpired, and confirms the domain has strict enough email protection turned on. Returns a clear pass or fail per domain, plus

Given an internet address (IP) or a network identification number (ASN), this tool returns who operates that piece of the internet: the network number, the owner's name, the country it's registered in, the regional registry that manages it, and the exact address range it belongs to.

Plexa /v1/pretrade/check — pre-trade token safety check on Base: can you still sell this token? avoid fires only on a trap proven on-chain now: no pool to exit into, an exit pot under 5% of your size, or the trading gate off (the honeypot shape). A drained pot is what a rug leaves behind — measured, not predicted. clear = no provable trap, NOT safe. Alias: same engine and price as /v1/pretrade/che

Live gas prices per chain — Base, Ethereum, and Solana from public RPCs, with speed tiers where derivable, plus a cheapest-chain recommendation. Toll: $0.005 USDC on Base or Solana.

Get current exchange rate between two currencies using ECB data. Supports all major currencies. Returns rate, inverse rate, and date.

Paint one pixel on 21millionpixels.art, a shared 21,000,000-pixel canvas. Reads are free; paid pixels skip the human cooldown.

US overnight interest rates — latest SOFR and effective federal funds rate (EFFR), transaction volumes and policy target bounds. Compare secured and unsecured dollar funding costs and track monetary policy. x402Atlas is not affiliated with the New York Fed. The New York Fed does not sanction, endorse, or recommend any products or services offered by x402Atlas.

Convert and compress images to WebP, AVIF, JPEG or PNG. Optimize and shrink photos for web and CDN delivery from any image URL.