Explore APIs

Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening. POST { email } or { emails: [...] } (max 20).

Compare growth classes (n, n log n, n^2, 2^n, n!) at a given n: operation counts, run time, largest n a time budget allows.

Country for an ITU E.164 calling code or international number prefix, such as +44 or +1 876; flags shared codes.

Bitcoin network health: tip height, block pace vs 10 minutes, difficulty retarget forecast, hashrate trend and Lightning size.

Tri-state domain registration availability intelligence

Write a money amount in words for a cheque (EN/ES/FR/DE): you give the currency names, no rates; words or 56/100 cents.

Parse CSV text (quotes, escaped quotes, embedded commas and newlines) into JSON rows, detecting the delimiter.

CAA records for a domain (walking up to parent names): which CAs may issue certificates, wildcard rules and reporting contacts.

Convert a number between bases 2 to 36 exactly (binary, octal, decimal, hex), with big-integer precision.

Korea premium per coin: Upbit and Bithumb KRW prices vs the Binance USDT price, converted with the ECB USD/KRW reference rate (date returned); without symbols, the top 20 Upbit markets by 24h KRW volume.

Live universal sky snapshot, no inputs: geocentric ecliptic longitudes for 13 bodies (Sun through Pluto, Chiron, lunar nodes) with zodiac sign/degree and 64-gate wheel placements, current moon phase and illumination, active retrogrades, and a 30-day almanac of upcoming stations and lunations. JPL-validated ephemeris. JSON. $0.01 USDC via x402, or API key.

Goldsky Edge RPC — prepaid balance, funds ~1000 requests at 5 atomic units each

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 seasons, or Arabic documents.

Convert an amount between ~50 currencies at the official reference rate (Bank Al-Maghrib for MAD pairs, ECB otherwise, cross via EUR), with rate, date and source.

Metres per pixel, map scale (1:N) and tile width on the ground for a zoom level and latitude.

Convert an airport code between IATA (3 letters) and ICAO (4 letters) and validate the format; reports unknown codes.

Entry tier of the multifamily deals feed: every active listing at card level — address, price, units, advertised cap rate, listing URL, freshness — without the computed underwriting or scoring. Same coverage, cheapest way to evaluate the feed. Same query filters as the full feed. Every field typed; a query that matches nothing returns free — you never pay for a blank.

Percent-encode or decode text as URL component, path, query or form data (UTF-8), with byte counts.

Convert text to camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, sentence case and a URL slug.

Launch directories from 11 popular public lists that were dead, unreachable, erroring or redirecting to another site on our Oct 2026 live check (DNS re-checked over DoH). Drop them from a launch plan. Optional filter by status kind.

Decode international Morse code back into text. Letters are separated by whitespace and words by "/". Unknown Morse sequences are clean 400s.

Current UTC time (ISO and unix ms) signed by the genexxis notary key, with the signed message and signature for independent verification.

Status of every Bitcoin Improvement Proposal as JSON: number, layer (consensus soft fork, peer services, applications), title, type and status (Draft, Complete, Deployed, Closed...), with links. Parsed live from the bitcoin/bips repository index, plus counts by status.

Buy a site upload slot. Upload a zip file, then activate to extract and serve as a static site.

Exact age in years, months and days from a birth date as of a date, plus next birthday and days until it.

Cron next-run calculator — generate future times for bounded five-field POSIX cron schedules in IANA timezones with explicit daylight-saving (DST) policies.

Decode a base64 byte buffer from one character set and re-encode it into another (utf-8, utf-16le, utf-16be, latin1, ascii). Characters that the target set cannot represent, or bytes invalid for the source set, are clean 400s.

Compute or verify the GS1 mod-10 check digit for EAN-8, UPC-A, EAN-13, ITF-14 (GTIN-14) and SSCC numbers.

YAML to JSON. POST a YAML document; the response is pretty-printed JSON. Anchors and aliases are resolved, and a multi-document stream converts as its FIRST document rather than as an array — the direction that bites, because YAML is the larger language.

Website abandonment check for a company domain. Fetches the homepage now and says why it is or isn't serving: hosting billing lapsed (Vercel, Squarespace, Wix), site removed from its platform, CDN origin unreachable, parked or for sale, 410 gone, bot challenge, or serving. For domains Tiag Scovik watches nightly, adds the date the current state began and up to 30 nights of history. Use before payi