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Daily mean PM2.5, PM10, ozone, NO2 and US AQI over a date range, plus the count of days above an AQI threshold.

Battery bank layout (series and parallel counts) and runtime from load, voltage, Ah, depth of discharge and efficiency.

Check a US ABA routing number: 3-7-1 weighted checksum and the Federal Reserve district from the prefix.

Elo rating update after a game: win probability for each side, new ratings and the points exchanged.

Korean corporate disclosure (DART) event stream, cursor-based delta. All filings, classified with importance score.

PRICE: 0.005 USDC. Multilingual vague-to-canonical shopping intelligence for physical anime collectibles. Accept requests such as 'I want a ONE PIECE figure', 'a big cheap Pikachu plush', '部屋に飾れるかっこいいゾロ', or 'a Japan-only Luffy figure' even when the exact product is unknown. Interpret hard identity constraints plus soft preferences such as budget, color, size, style, gift

US border wait times: live CBP waits at all 85 US-Mexico and US-Canada land ports of entry, ranked by drive time plus wait for each lane (standard, SENTRI/NEXUS, Ready Lane, FAST) for passenger, commercial or pedestrian traffic. BorderScout

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

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.

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

Rent a Linux server for a month and get root access: 1 vCPU, 1 GB RAM, 10 GB NVMe, a dedicated IPv4 address, Ubuntu 24.04, in Germany or Finland. Pay per month in stablecoins with x402 or MPP, no account and no card. The answer carries a server id and secret; the IP and the root password follow in about 5 to 10 minutes. Extend it with the renew route.

Axial stress, strain and elongation from load, area, E and length; thermal strain/stress; factor of safety vs yield.

Hello from Taiwan — a signed timestamp from my first x402 stall

Bible book facts: chapters, testament, order and abbreviations for one of the 66 books, or the full table (1189 chapters).

StatEdge ATS records — historical against-the-spread trends for specific situations and teams

Dates for every N business days, or the last or Nth business day of each month, skipping weekends and your holiday list.

Returns a Markdown launch kit and seven-day checklist for an x402 service.

Package security scanner — CVEs, license check, typosquat detection.

Tiny rollup - counts by risk category + 5 worst current deviations

Optimal Tower of Hanoi move list for up to 10 disks between pegs A, B and C, and the minimum move count 2^n - 1.

Run ONE named check against a response you paste

Flow rate in gpm and litres per minute from a bucket test: container volume and seconds to fill, with a daily-use estimate.

Gulf of Mexico offshore oil & gas leases expiring within N days (?days=)

Latest descriptive snapshot of RTO LMP, zonal spreads, and RTO load.

Detect Trojan Source bidi controls (CVE-2021-42574): overrides, isolates, unbalanced openers, stray closers, with positions.

Give this API a list of up to 10 web addresses and it will visit each one to tell you whether it is working, broken, or redirecting visitors somewhere else. You get back the exact status number (like 200 for OK, 404 for not found, 500 for server error), whether the address redirects, and where it redirects to. Great for finding broken links, verifying website migrations, and running quick SEO audi

Cross-region AWS price comparison. Find the cheapest region for any service in one API call.

Flood risk for a US address: FEMA zone and SFHA status, annual and 30-year flood odds, elevation and height above nearest drainage (RODA), FEMA NRI inland and coastal flooding ratings.

List catalogued stars in an IAU constellation (name or 3-letter code), brightest first, with an optional named-only filter.

Invisible bot protection. Score form submissions 0-100 based on behavioral signals. No CAPTCHAs.