Other

Is B20 live on Base mainnet? Queries the Activation Registry precompile for base.b20_asset and base.b20_stablecoin (or a custom feature id). Honest pre-launch too: reports not-activated until the registry flips.

A bounded head of ONE table in a Form 13F data set, read with two byte-range requests against sec.gov (the archive's central directory plus the first 256 KB of the chosen table) so the multi-hundred-MB zip is never downloaded. Returns the archive's members with sizes, the table's columns and its first rows (1-200, default 25) as objects: SUMMARYPAGE (per filing: holdings count, total value, confidential-omission flag), SUBMISSION (accession, filer CIK, period, form), COVERPAGE (manager name and.

Diff two texts. The default `unified` mode returns a unified-diff patch string; `lines`, `words`, and `chars` modes return a structured array of added/removed/unchanged parts.

Generate a random Luhn-valid TEST card number for the given network (default Visa). For testing only — these are not issued cards and cannot be charged. The response is always flagged `test:true`.

Diameter, circumference and area of a circle from its radius.

The n-th Catalan number Cₙ = C(2n, n)/(n+1), counting balanced bracketings, binary trees, and many other structures. Requires n ≤ 10000.

Munition Google Shopping: x402-paid Google Shopping results for AI agents via Serper. Pay 0.004 USDC per query for products with price, seller, rating and link — useful for price comparison and product research.

+1 more from api.munition.io

Korean exchange alerts: new listings, delistings, investment warnings, caution flags

+1 more from api.printmoneylab.com

Lightweight gamma regime classification timeline. Returns regime, GEX flip, and key levels per date (max 90 days).

Classifies captcha type (reCAPTCHA, hCaptcha, Turnstile) and difficulty. Eval only — we do NOT solve captchas.

+5 more from shelf.thirdmade.net

Returns live perpetual-futures funding rates, mark and index price, open interest, and 24h volume for BTC, ETH, SOL, XRP, and ADA from Kraken Futures and Hyperliquid, plus a per-symbol consensus with 8h and annualized funding, who pays whom, and a LONG_CROWDED / SHORT_CROWDED / BALANCED crowding label — use it to price carry or spot a crowded side before taking a leveraged position. Cached 5 minutes.

+1 more from x402.coinopai.com

LastLook Data — EFFR vs IORB spread. Shows where the effective Fed funds rate trades relative to interest on reserves.

+1 more from api.lastlookdata.com

Quote one Even Steven bet: the even-money payout at liquidity, the early line you would lock right now, and the flat 2% fee on stake paid upfront.

Translate text for AI agents - POST any text up to 2,000 chars with a target language, get clean JSON back: the detected source language + the full translation, never prose. Any language pair - Spanish, French, German, Japanese, Chinese, Korean, Arabic, Hindi, Portuguese, English - source auto-detected when omitted. Translation API, language translation, localize, i18n. No API key, no account. POST {text, target_lang, source_lang?}. Free sample: /translate/example.

+1 more from clink-lithium-vault.fly.dev

Turn a string of phonetic words back into text ("Sierra Oscar Sierra" → "SOS"). Accepts common alternative spellings (Alpha, Juliet, Niner). Unknown words are clean 400s.

Validate a Norwegian VAT (MVA) number against the official business register. Validity means the entity exists and is entered in the VAT register.

Validate a Polish VAT (NIP) number against the official VAT register. Validity means the taxpayer's VAT status is active (Czynny).

Hamming distance — the number of positions at which two EQUAL-LENGTH strings differ — plus a normalized similarity. Strings of unequal length are a clean 400.

Return the ordinal day of the year (1..366), the number of days in that year and whether it is a leap year.

Compute the date of Western (Gregorian) Easter Sunday for a year in 1583..9999 using the Anonymous Gregorian computus.

Compute network details of a CIDR block — network & broadcast address, usable host range, total and usable address counts. Works for IPv4 and IPv6 (counts returned as strings for large IPv6 blocks). Honours RFC 3021 for /31.

Generate a harmony scheme (complementary, analogous, triadic, tetradic, monochromatic) from a base color.

Add/subtract business days to a date, or count business days between two dates — skipping weekends and optional holidays.

Validate a GTIN barcode number — EAN-8, UPC-A (12), EAN-13 or GTIN-14 — by the standard mod-10 check digit. Length selects the scheme.

Validate a 15-digit mobile device IMEI by its Luhn check digit. Spaces and hyphens are ignored.

Render an ISO 8601 duration as an English phrase, e.g. 'P1Y2M' → '1 year and 2 months'. Components are shown in descending order with correct pluralization.

Encode a coordinate to a geohash and return its bounding box and 8 neighbors.

Distance and initial bearing between two coordinates.

Build a scale from a root note and type (major, natural-minor, harmonic-minor, melodic-minor, dorian, phrygian, lydian, mixolydian, locrian, major-pentatonic, minor-pentatonic, blues, chromatic). Heptatonic scales and modes are spelled diatonically (F major → F G A Bb C D E). Returns the note names, MIDI numbers and semitone intervals.

Validate a payment-card number: Luhn check-digit test plus network detection and length check. A syntactically valid number that fails Luhn returns `valid:false` (a 200, not an error).