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Calculators & converters
2,405 listings from 1,093 providers, 2,053 answering · counted
Filed by addrbook from the words in each listing, so a heading says what a listing claims to be for.
Showing 1–25, one row per provider, those answering first · names and descriptions as their source publishes them
- X Paywww.api-xpay.comGenerate a random UUID v4Livechecked Evidence 2/4x402x402 Bazaar196 payers
- JSON diffagent402.toolsDeep-compare two JSON values. Returns a list of changed/added/removed paths (capped at 1000 differences).Livechecked Evidence 2/4x402x402 Bazaar2 payers57 more from agent402.tools
- SiteCheckapi.sitecheck-api.workers.devA QR code for a text of up to 300 characters (a URL, Wi-Fi login or contact card), generated locally. format=svg returns the image itself as image/svg+xml; format=json returns the version, the module count, the SVG and a data URI. Error correction L, M, Q or H (default M); size from 128 to 1024 pixels (default 512).Livechecked Evidence 2/4x402x402 Bazaar15 payers19 more from sitecheck-api.workers.dev
- IP Geolocation Lookupgeoip.bip-rep.comResolve any public IPv4/IPv6 address (or hostname) to geolocation for analytics, fraud, and ops agents. Returns ISO country code, region, city, IANA timezone, latitude/longitude, EU membership flag, and the matched network range. Backed by an embedded MaxMind GeoLite2 dataset (no external API calls). Private and reserved IP ranges are rejected; no shell access.Livechecked Evidence 2/4x402x402 Bazaar11 payers
- awg_metric_convertmaterial.halowerk.comUses the geometric AWG definition, so results are exact for solid round conductors. Mass per metre and resistance follow from the material density and resistivity at 20 degrees Celsius; stranded conductors carry roughly two to five percent more mass and resistance per metre than the same nominal size and are not modelled separately. Supply either awg or cross_section_mm2, not both. Sizes 4/0 through 40 AWG are covered.Livechecked Evidence 2/4x402x402 Bazaar11 payers69 more from halowerk.com
- API Acreapiacre.comConvert an offset-aware ISO 8601 instant or a local wall time between IANA time zones with explicit DST gap and repeated-hour handling, nearby transition evidence, and a pinned local time-zone database.Livechecked Evidence 2/4x402x402 Bazaar11 payers3 more from apiacre.com
- Spread Paywall APIworkspace-x402-paywall.onrender.comEncodes text to base64 or decodes base64 back to text and returns the result string - payload encoding/decoding for agents without local shell toolingLivechecked Evidence 2/4x402x402 Bazaar11 payers4 more from workspace-x402-paywall.onrender.com
- x402.forgemesh.io/current-timex402.forgemesh.ioCurrent time API: the time right now in any IANA timezone (America/Chicago, Asia/Tokyo...) — local ISO timestamp, UTC ISO, unix epoch, human-readable string, and day of week. The sanity check every scheduling, logging, and coordination agent needs. Deterministic and instant.Livechecked Evidence 2/4x402x402 Bazaar10 payers21 more from forgemesh.io
- x402 Checkupcheckup.kagurazaka.devCheckup for x402 buyer clients. Pay once and get a field-by-field diagnosis of the payment your client signed (amount, recipient, validity window, clock offset, nonce, EIP-712 signature) and of the request that arrived, plus the facilitator's verify and settle results. Base mainnet payments get the full diagnosis; Base Sepolia payments get a preview with the status of each check only.Livechecked Evidence 2/4x402x402 Bazaar10 payers10 more from kagurazaka.dev
- agentshield.live/eanagentshield.liveCall when an agent has an 8 or 13 digit barcode and needs the checksum result and the GS1 prefix country. Does not confirm the product or a price.Livechecked Evidence 2/4x402x402 Bazaar10 payers5 more from agentshield.live
- ISHOBapi.ishob.comLook up a product barcode number: identify and validate EAN-13, EAN-8, UPC-A, UPC-E, GTIN-14, ISBN-13/10, ISSN and ISMN codes (wrong check digits are reported with the correct digit), convert between forms (GTIN-14, EAN-13, UPC-A, ISBN-10 <-> 13) and decode the GS1 prefix. Then fetch product data from open databases: name, brand, quantity, categories, image, labels, Nutri-Score (food, cosmetics, pet food via Open Food Facts) or title, authors, publisher and cover (books via Open Library).Livechecked Evidence 2/4x402x402 Bazaar10 payers2 more from ishob.com
- SiteCheck Agent Intel & Devapi.fadeandco.workers.devMakes a QR code as scalable SVG (21x21 modules, version 1) for up to 17 bytes at level L, 14 at M, 11 at Q or 7 at H, with the mask chosen by the standard penalty rules. Returns the SVG and a base64 copy. Larger versions are not supported; longer text returns 400.Livechecked Evidence 2/4x402x402 Bazaar10 payers4 more from fadeandco.workers.dev
- AveDaris Agent Utilitiesapi.avedaris.comCheck a UUID: send a string and get whether it is a valid UUID plus its version and variant. Pay $0.001 USDC per call on Base. No API key. Example output: {"result":{"valid":true,"normalized":"550e8400-e29b-41d4-a716-446655440000","version":4,"variant":"rfc4122"}}. After success, call vendor-intelligence or domain-trust-score with the same wallet.Livechecked Evidence 2/4x402x402 Bazaar10 payers2 more from avedaris.com
- screenshot-api-production-fe7e.up.railway.app/capture/screenshotscreenshot-api-production-fe7e.up.railway.appCapture a viewport-sized PNG screenshot of an http(s) URL with headless Chromium; returns a JSON envelope with the PNG base64-encoded under image_base64, plus final_url, title, viewport, and size.Livechecked Evidence 2/4x402x402 Bazaar10 payers3 more from screenshot-api-production-fe7e.up.railway.app
- 1gateway1gateway.devUse when scheduling across time zones or turning a local time into UTC without guessing DST. Input: to (IANA zones or KST, PST, CET...), optional from (zone of a local time, default UTC), time (ISO 8601, Unix seconds, or now). Output: JSON UTC instant, Unix time, and per zone: local ISO time with offset, weekday, abbreviation, DST and business-hours flags, day difference. Example: ?time=2026-10-12T09:00&from=Asia/Seoul&to=America/New_York,Europe/LondonLivechecked Evidence 2/4x402x402 Bazaar10 payers3 more from 1gateway.dev
- time-business-daysx402.agentindex.worldCount weekdays (Mon-Fri) between two dates, inclusive of both endpoints.Livechecked Evidence 2/4x402x402 Bazaar10 payers1 more from agentindex.world
- compute-api-production-245d.up.railway.app/base64compute-api-production-245d.up.railway.appBase64 encode/decodeLivechecked Evidence 2/4x402x402 Bazaar10 payers4 more from compute-api-production-245d.up.railway.app
- Generate a UUIDapi.gadgethumans.comGenerate fresh random UUID v4 identifiers, one or many in a single call. Cryptographically random, instant. Use for unique ids, request keys or fixtures.Livechecked Evidence 2/4x402x402 Bazaar10 payers1 more from gadgethumans.com
- WebberSites x402 Data APIapi.webbersites.comIP geolocation: country, region, city, coordinates, and timezone for any IPv4 or IPv6 address. Fast in-memory lookup for analytics, fraud, and personalization agents.Livechecked Evidence 1/4x402x402 Bazaar9 payers3 more from webbersites.com
- Agent Toolsagent-tools.jbarkules.workers.devCalculate business days between two dates for SLAs, invoice due dates, shipping and legal deadlines. Counts working days, skipping weekends and national public holidays by country (ISO code).Livechecked Evidence 1/4x402x402 Bazaar9 payers1 more from jbarkules.workers.dev
- Veridictum Legalveridictum.legalVerify one legal citation. Body: {"citation": "<string>"} - full ("Miranda v. Arizona, 384 U.S. 436 (1966)") or bare ("384 U.S. 436"); the case name enables mismatch detection. Deterministic: regex plus cache / local corpus / CourtListener, no LLM in the path. status=verified (name confirmed), suspicious (reporter resolves to a DIFFERENT case - the fabrication signature), or not_found. verified=false is a finding, not an error: do not retry. Only verified results are cached.Livechecked Evidence 1/4x402x402 Bazaar9 payers
- Business-day mathdatetime.openverbs.comAdd/subtract business days to a date, or count business days between two dates — skipping weekends and optional holidays.Livechecked Evidence 1/4x402x402 Bazaar9 payers18 more from openverbs.com
- Agent Web-Accessweb.cyberwarex.comRender any live web page to a portable PDF, returned as base64. JavaScript runs first, so single-page apps and dynamic content render correctly instead of coming out blank. Use it to archive a page, capture a receipt, invoice or report, snapshot terms or pricing that may change later, or hand a human a fixed copy of a URL.Livechecked Evidence 1/4x402x402 Bazaar9 payers1 more from cyberwarex.com
- kaisha-api.hp-vladic.workers.dev/calendar/business-dayskaisha-api.hp-vladic.workers.devJapanese 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/new-year rules.Livechecked Evidence 1/4x402x402 Bazaar8 payers
- WebberSites x402 Data APIx402-data-api.onrender.comIP geolocation: country, region, city, coordinates, and timezone for any IPv4 or IPv6 address. Fast in-memory lookup for analytics, fraud, and personalization agents.Livechecked Evidence 1/4x402x402 Bazaar8 payers