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Email validation — Syntax check + live MX/deliverability + disposable-domain flag.

MSHA mine safety verdict by Mine ID, mine name, or operator name: inspections, violation counts (incl. significant & substantial), assessed penalties, accidents/injuries/fatalities, and current mine status. Aggregated from MSHA Open Government Data (US federal public domain).

Fill a PDF form from structured data such as JSON or key-value answers. Also: fill a PDF form from JSON; populate form fields from data; complete a PDF application from known values; write answers into a form. Price scales with page count; this 402 carries the exact amount for the PDF sent.

Domain liveness check / verify / audit: DNS resolution (A/MX/NS/TXT records), whether mail routing exists, HTTP reachability.

Time one GET to a URL: DNS, connect, TLS, first byte and total ms, plus status, content type and size read.

Look up an employer's PERM (permanent labor certification / green-card sponsorship) filing history from public DOL OFLC disclosure data, fiscal years 2022-2026. Returns applications filed, certified/denied/withdrawn counts, certification rate, median offered wage (annualized), top job titles and SOC occupations, and most recent filing activity. Public-domain federal data.

Domain intelligence in one call: RDAP registration (registrar, created, expires, age, status, nameservers), DNS records (A, AAAA, MX, NS, TXT, CNAME, SPF, DMARC), a live HTTPS probe (reachable, status, server, redirect target, HSTS), plus risk flags and a 0-100 risk score for new, parked, unreachable or badly configured domains.

Evaluate a mathematical expression with optional named variables — arithmetic, comparison and logic operators plus functions like sqrt, abs, min, max, sin, cos, log, floor, round, etc. A syntax error, an undefined variable, or a non-finite result is a clean 400. The factorial operator is disabled for safety.

Verify a US healthcare facility by CMS Certification Number (CCN). Returns Medicare certification status, provider type, bed count, ownership type, accreditation, address, and phone. Source: CMS Provider of Services File (public domain).

Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call.

Verify any US college by name or IPEDS UNITID. Returns tuition (in-state/out-of-state), selectivity (applicants, admit rate, yield), enrollment, and 150% graduation rate. Public-domain NCES IPEDS data.

Is this vendor or domain safe? One call runs cert, DNS, email security, ransomware leak-site listing and vendor status checks and returns a verdict (safe, caution, risk, incomplete). $0.04 USDC on Base. Not charged if every check fails or input is invalid.

Retrieve change alerts for monitored URLs. Returns list of detected changes with timestamps.

Verify a USCG-documented vessel by official number, IMO number, or name. Returns vessel name, official number, IMO, flag, service/type, tonnage, dimensions, build year and builder, hailing port, trade endorsements, and Certificate of Documentation status and expiry. Public-domain USCG 'Merchant Vessels of the United States' data. Does NOT identify vessel owners (owner data was removed from the pub

Look up an employer's H-1B Labor Condition Application (LCA) filing history from public DOL OFLC disclosure data. Returns filing volume, certification rate, median offered wage (annualized), wage-level mix, and top occupations. Public-domain federal data.

Verify an SEC investment adviser by firm name or CRD number: registration status (SEC-registered / exempt reporting adviser), regulatory AUM and AUM band, Form ADV Item 11 disciplinary-disclosure flag, principal office state, and latest filing date. Public-domain SEC Form ADV data (Investment Adviser Information Reports, October 2026).

Call GET /ticks when you need the current official USDA farm market prices (hay, cattle, sheep, grain, dairy, hogs, produce, eggs, cold storage, poultry, cotton, grocery retail, grass-fed DTC, production cost, ag energy). Manitoba weekly auction marts are on this table. $0.05 = entire current table. Nationwide USDA AMS; Idaho/PNW barns are example rows. Sample https://ticks.bnm.farm/sample. Rebuy:

Convert text into a URL-safe slug: transliterate accents, apply a locale character map, and join with a separator.

Look up a domain's RDAP registration data — registrar, status, creation/expiry/update dates, nameservers and DNSSEC. Unregistered domains return found:false.

Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or empty matrix is a clean 400; a singular matrix simply returns 0.

IP geolocation, ASN and reputation lookup: VPN/Tor proxy, hosting and botnet C2 flags with an abuse score, for any IPv4 or IPv6 address.

Current public Lever job openings, counts by team, department, location, commitment and workplace type. Optional since ISO timestamp filters openings by creation date. No account or API key required.

Pay $0.01 USDC as a small donation or a simple live x402 integration test. Optional name and message are stored publicly and shown on GET /donations. Network: Base Mainnet. Each request records one donation and returns public feed links.

Detect whether an email address uses a disposable / throwaway domain (Mailinator, TempMail, etc.). Classifies the INPUT address. Static list match, no external call.

Balance an equation such as "H2 + O2 -> H2O" into the smallest whole-number coefficients using exact rational linear algebra. Equations that cannot be balanced with positive coefficients are clean 400s.

Mail Security Tools API: Prepaid email setup watch: up to 25 domains for 30 days, webhook on change. Pay once, then each domain's SPF, DMARC, DKIM (common selectors), MX and score are re-checked about once a day for 30 days. When something changes or breaks you get an HMAC-signed JSON POST at your https webhook_url (event watch.changed, kind changed|broke, before/after). A watch.created POST is se

Send an email for me

Concierge reader: send a public URL plus the JSON template you want; get that page's data back filled into your template. Free email field type (syntax, MX, disposable, role; no SMTP probe). Bad/private url, format >8KB, slow or unreachable page -> 400 charged:false before payment.

TAP Certified referee fee for one job with a budget up to $25.00: the seller's code is judged on the buyer's hidden tests in a sealed sandbox, and the escrow pays out or refunds on the verdict.

Convert power between dBm, dBW, mW and W, and the RMS and peak voltage across 50 ohms (or your impedance).